Re: Core Animation vs. Basic Cocoa Graphics
On 10 Mar 2010, at 17:13, Mazen M. Abdel-Rahman wrote:
Hi All,
I was able to write a simple calendar view that uses basic cocoa graphics to
draw directly on the view (NSBezierPath, etc.). I actually use several
different paths for drawing the calendar (it's a weekly calendar) to allow
different horizontal line widths (hour, half hour, etc.). The calendar view
is inside a scroll view - and is actually about 3 times longer than the view
window. The main problem is that the scrolling is not smooth - and my
assumption is that it's because the NSBezier stroke functions have to be
constantly called to render the calendar.
For something as relatively simple as this would moving to core animation -
i.e. trying to render the calendar on a layer instead (I am still trying to
learn core animation) add performance benefits? And would it allow for
smoother scrolling?
As no one else has offered an opinion:
Moving to CA might offer benefits but you can improve the performance of your
existing code by using an image cache.
I do this for an NSView with animated NSBezierPath content and it works fine.
So I would draw my image when the view resizes and there after service -
(void)drawRect:(NSRect)rect from the image cache.
You only regen the cache when required, say on resize on content change.
The rough code outline below might help you get something up an running:
NSView subclass:
ivars:
NSRect _cacheRect;
NSImage *_imageCache;
BOOL _useImageCache;
- (void)drawRect:(NSRect)rect
{
if (_useImageCache) {
// validate our rect
rect = [self validateDrawRect:rect];
// if cache exists use it to update rect.
// otherwise draw into our rect
if (_imageCache) {
[self drawRectFromCache:rect];
return;
}
// draw to image cache
_cacheRect = [self bounds];
_imageCache = [[NSImage alloc] initWithSize:_cacheRect.size];
[_imageCache lockFocus];
}
// draw entire bounds rect
rect = [self bounds];
// draw it
NSBezierPath *bgPath = [NSBezierPath bezierPathWithRect:rect];
NSColor *endColor = [NSColor colorWithCalibratedRed:0.988f green:0.988f
blue:0.988f alpha:1.0f];
NSColor *startColor = [NSColor colorWithCalibratedRed:0.875f
green:0.875f blue:0.875f alpha:1.0f];
NSGradient *gradient = [[NSGradient alloc]
initWithStartingColor:startColor endingColor:endColor];
[gradient drawInBezierPath:bgPath angle:90.0f];
if (_useImageCache) {
[_imageCache unlockFocus];
// refresh view from cache
[self drawRectFromCache:rect];
}
}
/*
draw rect from cache
*/
- (void)drawRectFromCache:(NSRect)rect
{
[_imageCache drawInRect:rect fromRect:rect
operation:NSCompositeSourceOver fraction:1.0f];
}
/*
validate the draw rect
*/
- (NSRect)validateDrawRect:(NSRect)rect
{
NSRect boundsRect = [self bounds];
// if bounds rect and cache rect are not equal then
// the cache will have to be updated
if (!NSEqualRects(boundsRect, _cacheRect)) {
[self clearDisplayCache];
}
// if no display cache available then need to draw bounds into cache
if (!_imageCache) {
rect = boundsRect;
}
return rect;
}
Regards
Jonathan Mitchell
Developer
http://www.mugginsoft.com
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Re: Core Animation vs. Basic Cocoa Graphics
Hi, are you drawing ALL of your paths whenever the user scrolls or only the ones that are within the visible rect? If the first, you may try to change that to the second and gain lots of performance. I draw a sound wave view and when drawing all of it while zoomed into it, it is sooowww. But when I only draw what actually needs to be drawn, it is lightning fast. With CoreAnimation: As soon as you have the image, you get fast drawing. Zooming, Size changes etc. may need a redraw of the image. Also, if the image is rather large, you'll need CATiledLayers otherwise your gpu memory may not be big enough to hold the image for the CALayer. Volker Am 10.03.2010 um 18:13 schrieb Mazen M. Abdel-Rahman: Hi All, I was able to write a simple calendar view that uses basic cocoa graphics to draw directly on the view (NSBezierPath, etc.). I actually use several different paths for drawing the calendar (it's a weekly calendar) to allow different horizontal line widths (hour, half hour, etc.). The calendar view is inside a scroll view - and is actually about 3 times longer than the view window. The main problem is that the scrolling is not smooth - and my assumption is that it's because the NSBezier stroke functions have to be constantly called to render the calendar. For something as relatively simple as this would moving to core animation - i.e. trying to render the calendar on a layer instead (I am still trying to learn core animation) add performance benefits? And would it allow for smoother scrolling? ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
KVO on NSDictionary elements
Hello all. Im implementing a live filter, and each, time I insert a filter in the filterDictionary the controller (which is another class) gets notified about the insertion.\ I was reading the KVO, and its says something about NSKeyValueChangeKindKey. So this is what Im doing in the Controller class: [_filterController addObserver:self forKeyPath:@_filterSettings options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld) context:NULL]; so I undertand that as it is above I will get notified only when I setUp a new NSDictionary in the ivar _filterSettings, obviously Im not getting notified when I insert something in the _filterSettings dictionary. How should I add the observer? is it possible to do so? thanks Gustavo ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to debug this error on closing a document?
Well I spent some of the day going through the application with the analyzer - first time I have used it, and I'm pretty impressed - I like the way it draws the lines showing the relevant lines of code...but although it did pick up some leaks etc, it made no difference to my specific problem. When I run with zombies enabled outside instruments, it just gets to *** -[NSManagedObjectContext release]: message sent to deallocated instance 0x100e99710 (where I have set a breakpoint) with a backtrace of: #0 0x7fff80e5be36 in ___forwarding___ () #1 0x7fff80e581d8 in __forwarding_prep_0___ () #2 0x7fff856fb99e in -[NSConcreteNotification dealloc] () #3 0x7fff80e06e43 in __CFArrayReleaseValues () #4 0x7fff80de7bc8 in _CFArrayReplaceValues () #5 0x7fff8573081a in postQueueNotifications () #6 0x7fff80e49427 in __CFRunLoopDoObservers () #7 0x7fff80e254af in __CFRunLoopRun () #8 0x7fff80e24c2f in CFRunLoopRunSpecific () #9 0x7fff831b9a4e in RunCurrentEventLoopInMode () #10 0x7fff831b9853 in ReceiveNextEventCommon () #11 0x7fff831b970c in BlockUntilNextEventMatchingListInMode () #12 0x7fff860f51f2 in _DPSNextEvent () #13 0x7fff860f4b41 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] () #14 0x7fff860ba747 in -[NSApplication run] () #15 0x000100331774 in -[OAApplication run] () #16 0x7fff860b3468 in NSApplicationMain () #17 0x00011af3 in main (argc=3, argv=0x7fff5fbff478) at /Users/gideon/Development/svn/trunk/mac/Source/main.m:11 ...and if I continue from there, it just gets a sigkill and dies. So I'm unsure what I can do with this backtrace to find out what this notification is, or whether I would have to subclass NSConcreteNotification and override dealloc and then use pose as, so I could print out the notification name etc, to get the info...is there a simpler way of seeing what the notification is? But even if I do find that, I'm really not sure that it would be much help because presumably it means that some notification was sent with the managed object context as the object, in which case it would just be retained and then released when the notification is released, so presumably whatever the notification is, it's not the root cause of the problem - just something that delays the visibility of the issue. Correct? I still don't quite understand how there can only be two events on this object as per the instruments output: # CategoryEvent Type RefCt Timestamp Address Size Responsible Library Responsible Caller 0 NSManagedObjectContext Malloc 1 00:12.552 0x1008d01f0 240 AppKit -[NSPersistentDocument managedObjectContext] 1 NSManagedObjectContext Zombie -1 00:26.194 0x1008d01f0 0 Foundation -[NSConcreteNotification dealloc] And yet it ends up a zombie. Still totally mystified by this and looking for suggestions on how to track it down. Thanks in advance. Gideon On 11/03/2010, at 11:05 AM, Kyle Sluder wrote: On Wed, Mar 10, 2010 at 4:45 PM, Gideon King gid...@novamind.com wrote: Seeing as none of this appears to have anything to do with my code, I am assuming that some notification created somewhere in my application is somehow the cause, but I'm not sure how to track this down. Run the analyzer first, then if that doesn't turn up any problems use NSZombieEnabled outside of Instruments. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Unable to receive keyDown Event in NSBorderlesswindow
Hi, I am using NSBorderless style mask for window and I am unable to receive the NSKeyDown event for that window.But if I make the window style as titled then I am able to receive the keyDown events. I am using below function for Keydown event: - (void)keyDown:(NSEvent *) event Thanks, Poonam ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Unable to receive keyDown Event in NSBorderlesswindow
I am using NSBorderless style mask for window and I am unable to receive the NSKeyDown event for that window.But if I make the window style as titled then I am able to receive the keyDown events. I am using below function for Keydown event: - (void)keyDown:(NSEvent *) event Implement -(BOOL)canBecomeKeyWindow and return YES. The NSWindow implementation returns YES if the receiver has a title bar or a resize bar, NO otherwise. A borderless window does not have a titlebar or a resize bar, hence it returns NO and never receives the event. /Dado ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Unable to receive keyDown Event in NSBorderlesswindow
On 11/03/2010, at 10:57 PM, Poonam Virupaxi Shigihalli wrote: Hi, I am using NSBorderless style mask for window and I am unable to receive the NSKeyDown event for that window.But if I make the window style as titled then I am able to receive the keyDown events. I am using below function for Keydown event: - (void)keyDown:(NSEvent *) event Thanks, Poonam Hello Poonam, in your window subclass, you need to override -canBecomeKeyWindow to return YES From the NSWindow class reference: canBecomeKeyWindow Indicates whether the window can become the key window. - (BOOL)canBecomeKeyWindow Return Value YES if the window can become the key window, NO otherwise. Discussion Attempts to make the window the key window are abandoned if this method returns NO. The NSWindowimplementation returns YES if the window has a title bar or a resize bar, NO otherwise. Hope that helps, Ron ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
EXC_BAD_ACCESS
Hi All,
I'm getting a 'EXC_BAD_ACCESS' error when calling the fill on a NSBezierPath.
Below is an outline of my code.
@interface Shape : NSObject {
NSBezierPath *path;
}
- (void)paint;
@end
@implementation Shape
- (void) paint {
[[NSColor redColor] set];
[path fill];
}
@end
@interface Square : Shape Moveable {}
- (Square *) initSquare;
- (void)initBezierPath;
@end
@implementation Square
- (Square *) initSquare {
self = [super init];
if (self) {
path = [[NSBezierPath alloc] init];
[self initBezierPath];
}
return self;
}
- (void) initBezierPath {
path = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0,0,10,10)
xRadius:5
yRadius:5];
[path closePath];
}
@end
it works if I change initBezierPath content to:
path = [path init];
[path appendBezierPathWithRoundedRect:r
xRadius:5
yRadius:5];
[path closePath];
From the main body I initialise a Square and call it's paint method in the
drawRect method of an NSView.
Any help would be greatly appreciated.
Billy Flatman
b.flat...@googlemail.com
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Re: EXC_BAD_ACCESS
Your initBezierPath method reallocates and reinitialises a path that's already
been created. It also autoreleases the result (as the allocation method
doesn't start with alloc, copy, mutableCopy, retain or new).
The result is that the first time 'path' is assigned it gets a non-released
value.
The second time that 'path' is assigned, the original value is leaked, as it is
never released, and it is given a new value which is autoreleased. By the time
you get to your paint method being called, the runloop has completed, and the
path has been deallocated.
What you probably want is...
- (id)initSquare // Note, id, not Square, this way, when we subclass, the type
system won't explode.
{
self = [super init];
if (nil != self)
{
path = [[NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0,0,10,10)
xRadius:5 yRadius:5] retain];
}
return self;
}
- (void)dealloc
{
[path release];
}
Bob
On 11 Mar 2010, at 13:38, Billy Flatman wrote:
Hi All,
I'm getting a 'EXC_BAD_ACCESS' error when calling the fill on a NSBezierPath.
Below is an outline of my code.
@interface Shape : NSObject {
NSBezierPath *path;
}
- (void)paint;
@end
@implementation Shape
- (void) paint {
[[NSColor redColor] set];
[path fill];
}
@end
@interface Square : Shape Moveable {}
- (Square *) initSquare;
- (void)initBezierPath;
@end
@implementation Square
- (Square *) initSquare {
self = [super init];
if (self) {
path = [[NSBezierPath alloc] init];
[self initBezierPath];
}
return self;
}
- (void) initBezierPath {
path = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0,0,10,10)
xRadius:5
yRadius:5];
[path closePath];
}
@end
it works if I change initBezierPath content to:
path = [path init];
[path appendBezierPathWithRoundedRect:r
xRadius:5
yRadius:5];
[path closePath];
From the main body I initialise a Square and call it's paint method in the
drawRect method of an NSView.
Any help would be greatly appreciated.
Billy Flatman
b.flat...@googlemail.com
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Re: EXC_BAD_ACCESS
Oops, sorry, my dealloc was buggy o.O
- (void)dealloc
{
[path release];
[super dealloc];
}
Bob
On 11 Mar 2010, at 13:38, Billy Flatman wrote:
Hi All,
I'm getting a 'EXC_BAD_ACCESS' error when calling the fill on a NSBezierPath.
Below is an outline of my code.
@interface Shape : NSObject {
NSBezierPath *path;
}
- (void)paint;
@end
@implementation Shape
- (void) paint {
[[NSColor redColor] set];
[path fill];
}
@end
@interface Square : Shape Moveable {}
- (Square *) initSquare;
- (void)initBezierPath;
@end
@implementation Square
- (Square *) initSquare {
self = [super init];
if (self) {
path = [[NSBezierPath alloc] init];
[self initBezierPath];
}
return self;
}
- (void) initBezierPath {
path = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0,0,10,10)
xRadius:5
yRadius:5];
[path closePath];
}
@end
it works if I change initBezierPath content to:
path = [path init];
[path appendBezierPathWithRoundedRect:r
xRadius:5
yRadius:5];
[path closePath];
From the main body I initialise a Square and call it's paint method in the
drawRect method of an NSView.
Any help would be greatly appreciated.
Billy Flatman
b.flat...@googlemail.com
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Re: EXC_BAD_ACCESS
isn't this almost exactly the same question you asked a week ago? It looks like
you did 1/2 of what Graham told you then but didn't totally understand his
answer.
Same answer, you're setting path to a newly-created NSBezierPath you don't own
and overwriting the one you alloc/init'ed earlier. So you're leaking the first
one and the second one you don't own so it's being released causing the bad
access error.
this line by the way
path = [ path init ];
is illegal, you can't init something twice. The second version happens to work
(even apart from the illegal extra init) because it appends a path to the
bezier which already exists, which you then aren't leaking.
It might help to go read the creation/destruction of objects and memory
management chapters again until it clicks.
On 11-Mar-2010, at 9:38 PM, Billy Flatman wrote:
Hi All,
I'm getting a 'EXC_BAD_ACCESS' error when calling the fill on a NSBezierPath.
Below is an outline of my code.
@interface Shape : NSObject {
NSBezierPath *path;
}
- (void)paint;
@end
@implementation Shape
- (void) paint {
[[NSColor redColor] set];
[path fill];
}
@end
@interface Square : Shape Moveable {}
- (Square *) initSquare;
- (void)initBezierPath;
@end
@implementation Square
- (Square *) initSquare {
self = [super init];
if (self) {
path = [[NSBezierPath alloc] init];
[self initBezierPath];
}
return self;
}
- (void) initBezierPath {
path = [NSBezierPath bezierPathWithRoundedRect:NSMakeRect(0,0,10,10)
xRadius:5
yRadius:5];
[path closePath];
}
@end
it works if I change initBezierPath content to:
path = [path init];
[path appendBezierPathWithRoundedRect:r
xRadius:5
yRadius:5];
[path closePath];
From the main body I initialise a Square and call it's paint method in the
drawRect method of an NSView.
Any help would be greatly appreciated.
Billy Flatman
b.flat...@googlemail.com
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Re: Help visualizing something in IB
On Mar 10, 2010, at 8:04 PM, Quincey Morris wrote: On Mar 10, 2010, at 15:54, Brian Postow wrote: Basically, I want the topView to scroll, but I always want to be able to see the buttonView. So if part of the topView isn't visible because it's been scrolled up, I want the buttonview at the top of the screen. I think what I want is to have a sort of topView2 which is the intersection between topView and the contentView of the ScrollView, if that makes more sense... It makes sense, but it doesn't have much precedent in terms of known Mac interfaces. Won't the visual effect be that the buttons appear to float over the window content some of the time? But with the weird side effect that the image below the buttons will get smaller as you scroll, until ... what? At some point does the image view get too small and disappear? When there's not enough vertical room to show the whole buttons, do they start scrolling out of the window? It seems awfully ad-hoc, but anyway ... Yeah, I think that that is what I wanted, and yeah, it does sound a little ad-hoc... In case the backstory helps, I'm writing a plugin for Mozilla. So, the outermost scrollwindow is the firefox view, and then my plugin is within an HTML frame inside the page, so I'm scrolling around in the firefox window, and whenever my plugin is visible, I want the buttons at the top of it... Yeah, that does help a bit. If you must follow this approach, then I'd suggest you register to get frame-changed notifications from topView. That way, you'll know if it moved within the window, or if it was resized as a result of the window/enclosing view resizing. Also, turn off auto-resizing for subviews of topView. When you get a notification, examine the geometry of the page, and re-layout your subviews appropriately (float the buttons, resize the image, etc). You'll then be able to avoid geometry collapse when the visible part of topView gets small. Interesting. I think I agree with you that this sounds like it's more effort than it's worth... I like your approach, and I'll probably end up using it if and when this feature makes it back to the top of my list... THANKS! Brian Postow Senior Software Engineer Acordex Imaging Systems ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
View does not get refreshed after Window deminimized...
Hi All,
I have subclassed a custom view in following way -
@implementation AppContentView
- (id)initWithFrame: (NSRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
// Initialization code here.
}
return self;
}
- (void)drawRect:(NSRect)rect
{
[[NSColor colorWithDeviceRed:0.961 green:0.961 blue:0.961 alpha:0.5] set];
[NSBezierPath fillRect: rect];
[super drawRect:rect];
}
@end
And on this custom view I have a progress bar, that progressbar gets it's
progress value from a NSThread. And I am using following function render the
progressbar, from NSThread -
[progBar performSelectorOnMainThread: (display) withObject: nil
waitUntilDone: YES];
Every thing works fine except in following scenario -
1. Minimize window while progress bar is at not completed (non 1.0), say
it's in 0.20 value,
2. After waiting some time, maximize the app window when progress bar is
completed (it's value is 1.0),
3. When window comes up it's only shows the progress bar up *0.20. *I am
handling notification* - NSWindowDidDeminiaturizeNotification.*
*
*
*Here is the code of notification handler and this handler is getting called
-*
*
*
**
*
- (void) deminimizedNotificationHandler
{
if ([progBar doubleValue] == 1.0)
{
[progBar setDoubleValue: 1.0];
[progBar setHidden: YES];
}
}
*
*
*
Does any body know why the why my progress bar is not getting completed...or
refreshed ...??? Even when it's value is 1.0
Regards
Cocoa.learner
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IsFileOnARemoteVolume
I am trying to code my own API isFileOnARemoteVolume since I didn't find
anything similar on Cocoa. If any, please let me know.
I use statfs to detect whether the filePath I pass as variable is on a
remote volume. Anyway, this wont work in case of broken symlinks.
So I have used a dirty trick to get the volumePath then I pass the
volumePath to the function statfs. Did I do right? Is a better or faster
way?
- (BOOL)isFileOnARemoteVolume:(NSString*)filePath
{
if([filePath length] == 0 ||
[filePath characterAtIndex:0] != '/') return NO;
NSMutableString*volumePath = [NSMutableString
stringWithString:@/];
if([filePath startsWith:@/Volumes]){
NSArray*comps = [filePath componentsSeparatedByString:@/];
[volumePath appendString:[comps objectAtIndex:1]];
[volumePath appendString:@/];
[volumePath appendString:[comps objectAtIndex:2]];
}
const char*cPathVolume = [mManager
fileSystemRepresentationWithPath:volumePath];
structstatfs stf;
if(statfs(cPathVolume, stf) != 0) return NO;
BOOLisRemoteVolume = ((stf.f_flags MNT_LOCAL) == 0);
return isRemoteVolume;
}
On the previous version of this method I used FSGetVolParms then
(volParms.vMServerAdr != 0) but now I would like to avoid to use the Carbon
routines.
Regards
--
Leonardo
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NSTableView _dataSourceValueForColumn:row: failure
Hi, All. I have a table view in the main window, where it works fine. And have yet another very similar table view in a popup modal panel. where it fails immediately after panel is closed. Debugger shows subj, as the failure point. In both cases dataSource for table view is assigned in the IB statically. The problem disappears if I clear dataSource assignment in the IB and include this assignment into awakeFromNib of the window controller. Also I include [myTableView setDataSource:nil] into -windowWillClose event handler of the same window controller. I tried to manipulate with release when closed option of the window - no effect. What it could be? Thanks. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
NSTextView backed by core data, undo problems
Dear list, I have a puzzling problem which is making my puzzler sore. Here's the outline: I have a core-data doc based app. I have core data entities which represent files on disk. When the entity is created, the contents of the file are loaded (in to a binary-data attribute called 'content'). Now I have an outline view which shows the project-tree of files. Double-clicking an item in the project-tree (outlineview) adds that NSManagedObject to an NSArrayController class (opened files). There is then an NSTextView which is bound to the 'content' attributed of the currently selected file in the array controller. So far, so good. Almost everything is working as I expect. The nasty little problem I have is that if I edit the contents of a file via the NSTextView, then do 'undo', the cursor (selection) in the NSTextView jumps to the end of the document, and the scrollview jumps to the top. Almost as if the whole text has been replaced. The only way I can avoid this so far is to set the binding so that it doesn't 'update continuously'. One other symptom is that each undo removes the last character typed, whereas with 'update continuously' off I get the more common behaviour of undoing the last word or at least recent group of actions. Does anyone have any insights in to what I might be doing wrong? I tried with a toy project and I'm getting the same results. Best wishes, Martin Martin Hewitson Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik und Universitaet Hannover Callinstr. 38, 30167 Hannover, Germany Tel: +49-511-762-17121, Fax: +49-511-762-5861 E-Mail: martin.hewit...@aei.mpg.de WWW: http://www.aei.mpg.de/~hewitson ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Bug with the ABPeoplePicker drag?
Hi all I've been experiencing problems with the drag and drop from the Address book control in my application. The control is in a view where a TableList is the destination for the drag. When the drop message is sent to my view, the following message is sent back to the control, as instructed for the File Promise type: NSArray *filenames = [sender namesOfPromisedFilesDroppedAtDestination:theUrl]; The value assigned to theUrl has been validated. When the message is sent, the following error is displayed: -[ABPeoplePickerTableEntry addressBook]: unrecognized selector sent to instance 0x114b67f20 And of course, no file is created. But, as I found out with great joy yesterday night, this works perfectly if the drag originates from the Address Book application! So I did some other tests: take an entry from the control in my application and drop it on my desktop. Exact same behaviour, error. But of course again, from the Application itself, bingo you have a vCard created. Any idea? I may have missed a configuration somewhere.. If not, how do we signal those potential bugs to the code's rightful owner? Thank you. Eric. smime.p7s Description: S/MIME cryptographic signature ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to debug this error on closing a document?
On 2010 Mar 11, at 02:27, Gideon King wrote: or whether I would have to subclass NSConcreteNotification and override dealloc and then use pose as, so I could print out the notification name etc, to get the info That would work, but Method Replacement [1] was added in Objective-C 2.0 as a replacement for pose as class. However, to do Method Replacement, you need to declare and implement a category on, in this case NSConcreteNotification, but that won't compile because NSConcreteNotification is Apple-private. Does anyone know how to do Method Replacement for debugging in an Apple-private class? [1] http://developer.apple.com/mac/library/samplecode/MethodReplacement/index.html ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [[Class alloc] init] preferable over [[Class instance] retain]?
On Tue, 9 Mar 2010 23:58:55 +, Jeff Laing jeff.la...@spatialinfo.com said: The upshot was that apparently the iPhone developers like you to avoid the use of autorelease pools where possible. One hidden difference in the above is that in the first case you have (probably) populated the autorelease pool and in the other you (probably) haven't. I don't think it's accurate to say that you're supposed to avoid autorelease pools on iPhone. The quoted statement seems to me to misrepresent the docs, the comments from Apple in their examples, and so forth. What they're trying to say, it seems to me, is just the opposite: you should *use* autorelease pools on iPhone. What you should *not* do, if you can avoid it, is rely on the *implicit* autorelease pool. In other words, the problem with this: NSString* s = [NSString stringWithFormat...]; ...is that you don't know when s will be released. In some situations, you can easily fill up a lot of memory before the implicit autorelease pool is drained. One solution is to create an autorelease pool and release it explicitly. This puts *you* in charge of marking objects for release. In other words, to alloc and release an autorelease pool is (or can be) just as good as alloc and release of individual objects. And it takes care of the problem where autoreleased objects are inevitable or are created behind your back. m. -- matt neuburg, phd = m...@tidbits.com, http://www.tidbits.com/matt/ A fool + a tool + an autorelease pool = cool! AppleScript: the Definitive Guide - Second Edition! http://www.tidbits.com/matt/default.html#applescriptthings ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On 11 Mar 2010, at 9:38 AM, Alexander Bokovikov wrote: I have a table view in the main window, where it works fine. And have yet another very similar table view in a popup modal panel. where it fails immediately after panel is closed. Debugger shows subj, as the failure point. In both cases dataSource for table view is assigned in the IB statically. 1. You don't say what fail means. A crash? What error code? What stack trace? 2. This is all moot, because, as the leading underscore shows, _dataSourceValueForColumn:row: is a private method. It is not meant to be called by anyone but Apple. It is likely that only Apple knows what the preconditions and postconditions for calling it are; and they can change those conditions at any time. I Googled _dataSourceValueForColumn:. Have you noticed that virtually all the hits have titles like Arbitrary Crashes, Bug, Consistently crashes, issue, crashes everytime, Crash in my... data source? 3. Now that I re-read your message, you don't say whether you're implementing _dataSourceValueForColumn:row: or calling it; or even whether you're using it at all. Even if you're just implementing it, the principle holds: You don't know what the method is required to do, and you don't know what it will be required to do in 10.6.3. (Note for archives: The current version of Mac OS X is 10.6.2.) What are you trying to accomplish, and why do you think it cannot be done with supported API? — F ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On Mar 11, 2010, at 7:38 AM, Alexander Bokovikov wrote: Hi, All. I have a table view in the main window, where it works fine. And have yet another very similar table view in a popup modal panel. where it fails immediately after panel is closed. Debugger shows subj, as the failure point. In both cases dataSource for table view is assigned in the IB statically. The problem disappears if I clear dataSource assignment in the IB and include this assignment into awakeFromNib of the window controller. Also I include [myTableView setDataSource:nil] into -windowWillClose event handler of the same window controller. I tried to manipulate with release when closed option of the window - no effect. What it could be? Break on objc_exception_throw. corbin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Help visualizing something in IB
On Mar 10, 2010, at 8:04 PM, Quincey Morris wrote: If you must follow this approach, then I'd suggest you register to get frame-changed notifications from topView. That way, you'll know if it moved within the window, or if it was resized as a result of the window/enclosing view resizing. Also, turn off auto-resizing for subviews of topView. For completeness: I didn't think this through properly. Your topView is inside a view that's what is actually scrolled (the scroll view's documentView), so the topView frame won't change as a result of scrolling. I think what you'd need would be to observe the scroll view's clipView's bounds, which should change on either scrolling or resizing. If you ever get to doing this, you'll have to experiment to find the right thing to observe, and it's possible you might have to observe multiple views to catch all the cases. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On Thursday, March 11, 2010 at 10:11 PM Fritz Anderson wrote: 1. You don't say what fail means. A crash? What error code? What stack trace? EXC_BAD_ACCESS. Assembler call stack view shows line next to the subj call. OS X 10.5.8 Never tried it in 10.6.X 2. This is all moot, because, as the leading underscore shows, _dataSourceValueForColumn:row: is a private method. It is not meant to be called by anyone but Apple. It is likely that only Apple knows what the preconditions and postconditions for calling it are; and they can change those conditions at any time. Of couse, I never called it directly. I never implemented it. I just _use_ NSTableView. Nothing more. The fact is that it is working nice in the main app, where it is never destroyed explicitly. But it doesn't work correctly in a modal window, which I create and then release. As I've described the only way I've found is to assign the datasource explicitly in awakeFromNib and set it to nil explicitly in windowWillClose handler. Really my question was - is this a known bug, a feature or my mistake? Thanks. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On Thursday, March 11, 2010 at 10:29 PM Corbin Dunn wrote: Break on objc_exception_throw. Could you explain it? What does it mean? Thanks. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: View does not get refreshed after Window deminimized...
On Mar 11, 2010, at 06:50, cocoa learner wrote: And on this custom view I have a progress bar, that progressbar gets it's progress value from a NSThread. And I am using following function render the progressbar, from NSThread - [progBar performSelectorOnMainThread: (display) withObject: nil waitUntilDone: YES]; There seem to be two things wrong here. First, you must *not* set the value of the progress bar from a non-main thread. Setting the value causes a UI update, and that won't work properly unless it's done on the main thread. Instead, you must devise a method for the background thread to pass the desired value to the main thread, and have the main thread set the progress bar value. Second, it's rarely correct to invoke [NSView display] yourself. Typically, you would use [NSView setNeedsDisplay]. In any case, it's not clear why you think you need to cause the progress bar to redisplay. If you set the value properly from the main thread, it will redisplay itself as necessary. If you're having a problem with the animation not running, you just need to make sure you set (or re-set) the value often enough. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On 11 Mar 2010, at 11:44 AM, Alexander Bokovikov wrote: Of couse, I never called it directly. I never implemented it. I just _use_ NSTableView. Nothing more. The fact is that it is working nice in the main app, where it is never destroyed explicitly. But it doesn't work correctly in a modal window, which I create and then release. As I've described the only way I've found is to assign the datasource explicitly in awakeFromNib and set it to nil explicitly in windowWillClose handler. I misunderstood. My mistake. Have you run with zombies enabled? It's almost the first thing you should do if you get an EXC_BAD_ACCESS in framework code. Also, be sure Run Stop on Objective-C Exceptions is checked. — F ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On Mar 11, 2010, at 10:44 AM, Alexander Bokovikov wrote: Of couse, I never called it directly. I never implemented it. I just _use_ NSTableView. Nothing more. The fact is that it is working nice in the main app, where it is never destroyed explicitly. But it doesn't work correctly in a modal window, which I create and then release. As I've described the only way I've found is to assign the datasource explicitly in awakeFromNib and set it to nil explicitly in windowWillClose handler. Really my question was - is this a known bug, a feature or my mistake? Alexander, This seems to describe that you are releasing the datasource before the tableview that uses it is released [possibly by over-releasing it, as I would assume the tableview would retain it, but it may not]. Maybe make sure your window is released before the source is released. Or at the very least, that the window is closed/offscreen before the source is released. Eli ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Need help with scrolling marquee
I'm trying to create an effect on the iPhone to scroll text across the view in
a given location. Not really sure how to go about it so I did some
experimenting. Af first I tried to animate the scroll using a timer. That
gave me inconsistent movement; the velocity of the scrolling text appeared to
be non-constant. Then I remembered that CoreAnimation is really supposed to
take care of this kind of animation for you so I switch to trying to get it to
manage the timing for me. I must be doing it all wrong because I cannot
control the velocity of the scrolling text.
I expect my whole approach is probably wrong and am hoping that one of you has
a better approach or suggestions as to how to fix it. I haven't found much in
the way of CAScrollView documentation or examples to help. I've included the
code below. Hopefully the length will not be an issue.
//
// ScrollingMarqueeViewController.m
// ScrollingMarquee
//
// Created by Michael A. Crawford on 3/11/10.
// Copyright Crawford Design Engineering, LLC 2010. All rights reserved.
//
#import QuartzCore/QuartzCore.h
#import ScrollingMarqueeViewController.h
@implementation ScrollingMarqueeViewController
@synthesize scrollLabel;
- (CALayer*)textLayer
{
scrollLabel.text = @this is a long line of text that should be too long
for
@the screen width of this label.;
return scrollLabel.layer;
}
- (CAScrollLayer*)scrollLayer
{
CAScrollLayer* layer = [CAScrollLayer layer];
[layer addSublayer:[self textLayer]];
return layer;
}
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed that
// the animation wasn't smooth and then remembered that CA is supposed to do
// the animating for me. So, I switched to trying the code below but that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationDuration:5.0];
[scrollLayer scrollToPoint:CGPointMake(320.0f, 0.0f)];
[UIView commitAnimations];
#endif
}
- (void)viewDidLoad
{
[super viewDidLoad];
// create the scroll layer and add it to our view
scrollLayer = [self scrollLayer];
[self.view.layer addSublayer:scrollLayer];
// make it the same size as our label
scrollLayer.bounds = scrollLabel.frame;
// position it in the middle of the view
scrollLayer.position = CGPointMake(320.0f * 0.5f, 480.0f * 0.5f);
// scroll the text horizontally
scrollLayer.scrollMode = kCAScrollHorizontally;
// use a timer to make the scroll happen
scrollTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:@selector(timerFireMethod:)
userInfo:nil
repeats:/*YES*/NO];
}
@end
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Re: NSTableView _dataSourceValueForColumn:row: failure
On Mar 11, 2010, at 9:48 AM, Alexander Bokovikov wrote: On Thursday, March 11, 2010 at 10:29 PM Corbin Dunn wrote: Break on objc_exception_throw. Could you explain it? What does it mean? http://www.corbinstreehouse.com/blog/2008/08/your-most-important-breakpoint-in-cocoa/ corbin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On Mar 11, 2010, at 9:44 AM, Alexander Bokovikov wrote: On Thursday, March 11, 2010 at 10:11 PM Fritz Anderson wrote: 1. You don't say what fail means. A crash? What error code? What stack trace? EXC_BAD_ACCESS. Assembler call stack view shows line next to the subj call. OS X 10.5.8 Never tried it in 10.6.X 2. This is all moot, because, as the leading underscore shows, _dataSourceValueForColumn:row: is a private method. It is not meant to be called by anyone but Apple. It is likely that only Apple knows what the preconditions and postconditions for calling it are; and they can change those conditions at any time. Of couse, I never called it directly. I never implemented it. I just _use_ NSTableView. Nothing more. The fact is that it is working nice in the main app, where it is never destroyed explicitly. But it doesn't work correctly in a modal window, which I create and then release. As I've described the only way I've found is to assign the datasource explicitly in awakeFromNib and set it to nil explicitly in windowWillClose handler. Really my question was - is this a known bug, a feature or my mistake? Howdy! We would really need to see a backtrace at the point of the crash or exception being thrown. It is probably a bug in your app. corbin ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Help visualizing something in IB
On Mar 11, 2010, at 1:04 PM, Quincey Morris wrote: On Mar 10, 2010, at 8:04 PM, Quincey Morris wrote: If you must follow this approach, then I'd suggest you register to get frame-changed notifications from topView. That way, you'll know if it moved within the window, or if it was resized as a result of the window/enclosing view resizing. Also, turn off auto-resizing for subviews of topView. For completeness: I didn't think this through properly. Your topView is inside a view that's what is actually scrolled (the scroll view's documentView), so the topView frame won't change as a result of scrolling. I think what you'd need would be to observe the scroll view's clipView's bounds, which should change on either scrolling or resizing. If you ever get to doing this, you'll have to experiment to find the right thing to observe, and it's possible you might have to observe multiple views to catch all the cases. I should be able to just use the clipRect of the superview, right? Brian Postow Senior Software Engineer Acordex Imaging Systems ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTextView backed by core data, undo problems
On Thu, Mar 11, 2010 at 7:50 AM, Martin Hewitson martin.hewit...@aei.mpg.de wrote: The nasty little problem I have is that if I edit the contents of a file via the NSTextView, then do 'undo', the cursor (selection) in the NSTextView jumps to the end of the document, and the scrollview jumps to the top. Almost as if the whole text has been replaced. The only way I can avoid this so far is to set the binding so that it doesn't 'update continuously'. One other symptom is that each undo removes the last character typed, whereas with 'update continuously' off I get the more common behaviour of undoing the last word or at least recent group of actions. By setting the value continuously you're breaking the text view's undo coalescing. Doing this correctly is not going to be an easy task. You will need to learn much about the Cocoa text system. The 30,000ft overview: you want to mutate an NSTextStorage hooked up to the text view, rather than simply setting a property on the model object. Core Data and KVC don't support this pattern natively; you will need to write code, and it can get hairy. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Noob iPhone Question
Hi, I am now being approached to develop an iPhone application for one of my clients which will involve storing a cache of previously downloaded images. My question is whether or not there are constraints as to how my storage space I have at my disposal, and whether any of you have a link to further reading on this subject? regards, M___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
[MEET] CocoaHeads-NYC tonight - NSOperation
Sorry for the two hours' notice... Marc van Olmen will give the talk entitled Introduction to NSOperation that he was unable to give last month. I have no doubt it'll be worth the wait. As usual: (1) Please feel free to bring questions, code, and works in progress. We have a projector and we like to see code and try to help. (2) We'll have food and beer afterwards. (3) If there's a topic you'd like presented, let us know. (4) If *you'd* like to give a talk, let me know. Thursday, March 11 6:00 - 8:00 Downstairs at Tekserve, on 23rd between 6th and 7th http://tekserve.com/about/hours.php for directions and map Everyone's welcome. Just tell the person at the front you're there for CocoaHeads. Hope to see you there! --Andy ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Noob iPhone Question
Thanks - I think I may still implement some form of cache control just to keep it manageable though. On 11 Mar 2010, at 21:32, Thomas Mueller wrote: Hi Michael, I don't think there are any artificial limits for how much memory your application can use. As long as there is space left on the device you should be able to keep using it for storing your downloaded images. Regards, Thomas On 12 March 2010 08:08, Michael Davey frak@gmail.com wrote: Hi, I am now being approached to develop an iPhone application for one of my clients which will involve storing a cache of previously downloaded images. My question is whether or not there are constraints as to how my storage space I have at my disposal, and whether any of you have a link to further reading on this subject? regards, M___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/thomasmueller76%40googlemail.com This email sent to thomasmuelle...@googlemail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Need help with scrolling marquee
On 12/03/2010, at 5:23 AM, Michael A. Crawford wrote:
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed that
// the animation wasn't smooth and then remembered that CA is supposed to
do
// the animating for me. So, I switched to trying the code below but that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
Hi Michael,
This is a classic naive mistake. You're incrementing the position by a fixed
amount each time the timer fires. Problem is, you can't guarantee that the
timer will fire exactly at the time it should, so your scrolling speed is at
the mercy of how busy things are, so will speed up and slow down.
Recall that speed is distance/time, so if you want a constant speed, you have
to work out how much distance the thing should have moved in the actual time
interval you got.
Roughly (typed into mail):
- (void)timerFireMethod:(NSTimer*) theTimer
{
NSTimeInterval elapsedTime = [NSDate timeIntervalSinceReferenceDate] -
m_startTime; // m_startTime ivar set when the animation began
CGFloat distance = m_speed * elapsedTime; // m_speed is the scrolling
speed in points per second
[thing setPosition:distance];
}
With this approach, the exact timing intervals don't matter - the position will
be correct. If things get busy what will happen is that the jumps between
positions will get a bit larger.
That said, Core Animation might do the job better, but I just wanted to point
out what the problem was with your original approach.
--Graham
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Re: Need help with scrolling marquee
Isn't there a truncation property that handles this for a UILabel?
On Thu, Mar 11, 2010 at 4:53 PM, Graham Cox graham@bigpond.com wrote:
On 12/03/2010, at 5:23 AM, Michael A. Crawford wrote:
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed
that
// the animation wasn't smooth and then remembered that CA is supposed
to do
// the animating for me. So, I switched to trying the code below but
that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
Hi Michael,
This is a classic naive mistake. You're incrementing the position by a
fixed amount each time the timer fires. Problem is, you can't guarantee that
the timer will fire exactly at the time it should, so your scrolling speed
is at the mercy of how busy things are, so will speed up and slow down.
Recall that speed is distance/time, so if you want a constant speed, you
have to work out how much distance the thing should have moved in the actual
time interval you got.
Roughly (typed into mail):
- (void)timerFireMethod:(NSTimer*) theTimer
{
NSTimeInterval elapsedTime = [NSDate timeIntervalSinceReferenceDate] -
m_startTime; // m_startTime ivar set when the animation began
CGFloat distance = m_speed * elapsedTime; // m_speed is the scrolling
speed in points per second
[thing setPosition:distance];
}
With this approach, the exact timing intervals don't matter - the position
will be correct. If things get busy what will happen is that the jumps
between positions will get a bit larger.
That said, Core Animation might do the job better, but I just wanted to
point out what the problem was with your original approach.
--Graham
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Re: Need help with scrolling marquee
Thanks, Graham, I realized the timer would have jitter. When I realized what
was going on and began to think about how to fix it, that is when I had one of
those head-slap moments where I asked, Why am I not using CoreAnimation for
this?
-Michael
On Mar 11, 2010, at 4:53 PM, Graham Cox wrote:
On 12/03/2010, at 5:23 AM, Michael A. Crawford wrote:
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed that
// the animation wasn't smooth and then remembered that CA is supposed to
do
// the animating for me. So, I switched to trying the code below but that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
Hi Michael,
This is a classic naive mistake. You're incrementing the position by a
fixed amount each time the timer fires. Problem is, you can't guarantee that
the timer will fire exactly at the time it should, so your scrolling speed is
at the mercy of how busy things are, so will speed up and slow down.
Recall that speed is distance/time, so if you want a constant speed, you have
to work out how much distance the thing should have moved in the actual time
interval you got.
Roughly (typed into mail):
- (void) timerFireMethod:(NSTimer*) theTimer
{
NSTimeInterval elapsedTime = [NSDate timeIntervalSinceReferenceDate] -
m_startTime; // m_startTime ivar set when the animation began
CGFloat distance = m_speed * elapsedTime; // m_speed is the scrolling
speed in points per second
[thing setPosition:distance];
}
With this approach, the exact timing intervals don't matter - the position
will be correct. If things get busy what will happen is that the jumps
between positions will get a bit larger.
That said, Core Animation might do the job better, but I just wanted to point
out what the problem was with your original approach.
--Graham
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Re: Need help with scrolling marquee
I played with the truncation property but to make that work you have to
continually modify the length of the string. I want to write the string to the
buffer once and then have CA scroll it for me at a constant speed I can set.
This is where I'm looking for assistance.
-Michael
On Mar 11, 2010, at 4:58 PM, Eric E. Dolecki wrote:
Isn't there a truncation property that handles this for a UILabel?
On Thu, Mar 11, 2010 at 4:53 PM, Graham Cox graham@bigpond.com wrote:
On 12/03/2010, at 5:23 AM, Michael A. Crawford wrote:
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed
that
// the animation wasn't smooth and then remembered that CA is supposed
to do
// the animating for me. So, I switched to trying the code below but
that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
Hi Michael,
This is a classic naive mistake. You're incrementing the position by a
fixed amount each time the timer fires. Problem is, you can't guarantee that
the timer will fire exactly at the time it should, so your scrolling speed is
at the mercy of how busy things are, so will speed up and slow down.
Recall that speed is distance/time, so if you want a constant speed, you have
to work out how much distance the thing should have moved in the actual time
interval you got.
Roughly (typed into mail):
- (void)timerFireMethod:(NSTimer*) theTimer
{
NSTimeInterval elapsedTime = [NSDate timeIntervalSinceReferenceDate] -
m_startTime; // m_startTime ivar set when the animation began
CGFloat distance = m_speed * elapsedTime; // m_speed is the scrolling
speed in points per second
[thing setPosition:distance];
}
With this approach, the exact timing intervals don't matter - the position
will be correct. If things get busy what will happen is that the jumps
between positions will get a bit larger.
That said, Core Animation might do the job better, but I just wanted to point
out what the problem was with your original approach.
--Graham
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Answer: Bison with Objective-C Semantic Actions? Works
Just a quick thank-you to those who responded to my question about using bison to generate a language intepreter in an Cocoa Foundation/Xcode/Objective-C environment. Xcode does everything needed to make it seamless. I named the yacc file Interpreter.ym and made the semantic value type for all terminals and non-terminals on the parsing stack to be the general Objective-C id type and have had no problems. My semantic actions are all written using Objective-C messaging with the $$, $1, ..., $n stack variables. No perspiration; no worries. Thanks again for the great help available from this group. (Cross posted to the Xcode group since Xcode makes working with yacc/bison almost trivial.) Tom Wetmore, Chief Bottle Washer, DeadEnds Software ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Switching methods in private classes in Apple frameworks
(following on from the thread How to debug this error on closing a document?, but it's really moved on to a new topic at this point) I was not aware that poseAsClass is not available in 64 bit applications. I looked at the Apple example of exchanging a method in NSWindow, and it looked easy enough, so I tried the method exchanging by using class-dump to generate the header for NSConcreteNotification, and implemented the switch, but it gives a linker error: _OBJC_CLASS_$_NSConcreteNotification, referenced from: l_OBJC_$_CATEGORY_NSConcreteNotification_$_MethodReplacement in MyConcreteNotification.o __objc_classrefs__d...@0 in MyConcreteNotification.o ld: symbol(s) not found collect2: ld returned 1 exit status So it must be in the foundation binary, but the linker doesn't pick it up. Is there a way around this? Gideon On 12/03/2010, at 2:00 AM, Jerry Krinock wrote: On 2010 Mar 11, at 02:27, Gideon King wrote: or whether I would have to subclass NSConcreteNotification and override dealloc and then use pose as, so I could print out the notification name etc, to get the info That would work, but Method Replacement [1] was added in Objective-C 2.0 as a replacement for pose as class. However, to do Method Replacement, you need to declare and implement a category on, in this case NSConcreteNotification, but that won't compile because NSConcreteNotification is Apple-private. Does anyone know how to do Method Replacement for debugging in an Apple-private class? [1] http://developer.apple.com/mac/library/samplecode/MethodReplacement/index.html ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Switching methods in private classes in Apple frameworks
On Mar 11, 2010, at 4:24 PM, Gideon King wrote: (following on from the thread How to debug this error on closing a document?, but it's really moved on to a new topic at this point) I was not aware that poseAsClass is not available in 64 bit applications. I looked at the Apple example of exchanging a method in NSWindow, and it looked easy enough, so I tried the method exchanging by using class-dump to generate the header for NSConcreteNotification, and implemented the switch, but it gives a linker error: _OBJC_CLASS_$_NSConcreteNotification, referenced from: l_OBJC_$_CATEGORY_NSConcreteNotification_$_MethodReplacement in MyConcreteNotification.o __objc_classrefs__d...@0 in MyConcreteNotification.o ld: symbol(s) not found collect2: ld returned 1 exit status So it must be in the foundation binary, but the linker doesn't pick it up. Is there a way around this? On iPhone and 64-bit Mac, the linker enforces internal classes more strictly. NSConcreteNotification is private, so you can't link to it or subclass it. You can still get the class via runtime introspection like NSClassFromString(), which for debugging purposes ought to be good enough. -- Greg Parker gpar...@apple.com Runtime Wrangler ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Help visualizing something in IB
On Mar 11, 2010, at 10:58, Brian Postow wrote: I should be able to just use the clipRect of the superview, right? Well, you have to observe something that produces notifications -- which means the bounds or frame of a view. You're likely not interested in the actual bounds or frame you're being notified about. You just want to be told when something that matters changes. Once you've received a notification, I think you'll simply want to examine the visibleRect of topView. Basically, if I understand correctly, you'll want to position the button view at the top of the visibleRect, and the image view in the rest of the visibleRect, and also handle the edge cases where there isn't enough room to show those subviews. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Core Data: inverse relationship not updated until next Run Loop
In using Core Data, I was under the impression that if I do this: [department addEmployeesObject:employee] // department now has 1 employee [moc deleteObject:employee] Then department will end up with no employees, assuming that the inverse relationship is set correctly. But it turns out within the same run loop, if I inspect [department.employees count], then the value is 1. But in the next run loop, the value becomes 0, which is what it should be. Is my observation accurate or is something wrong? Does this mean that although I generally don't need to call [department removeEmployeesObject:employee] after deleting an employee, if I want department to be in a consistent state within the same event loop, I will need to make that call? Thanks, Eric ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Switching methods in private classes in Apple frameworks
This is really cool...so I can replace a method without being a subclass or
category.
So I implemented an NSObject subclass with the new method, and did the method
exchange, and my new method was called instead of the old one, but I had a
problem - the call to the switched out method (dealloc from the
NSConcreteNotification) didn't work. I assumed that was because the old
implementation of dealloc was now moved to my class, so I changed the method
switching so that it ensures that the old dealloc is replaced with the
implementation of mydealloc, and that I have added a method to the
NSConcreteNotification which is called mydealloc, and does the things that the
old dealloc did.
This seems to work, so I thought I'd post it here in case anyone else needs to
replace a method in a private class, and be able to call the original
implementation.
#import objc/runtime.h
#import Cocoa/Cocoa.h
@interface MyConcreteNotification : NSObject {
}
- (void)mydealloc;
@end
@implementation MyConcreteNotification
+ (void)load {
Method originalMethod =
class_getInstanceMethod(NSClassFromString(@NSConcreteNotification),
@selector(dealloc));
Method replacedMethod = class_getInstanceMethod(self,
@selector(mydealloc));
IMP imp1 = method_getImplementation(originalMethod);
IMP imp2 = method_getImplementation(replacedMethod);
// Set the implementation of dealloc to mydealloc
method_setImplementation(originalMethod, imp2);
// Add a mydealloc method to the NSConcreteNotification with the
implementation as per the old dealloc method
class_addMethod(NSClassFromString(@NSConcreteNotification),
@selector(mydealloc), imp1, NULL);
}
- (void)mydealloc {
NSLog(@My concrete notification is being deallocated);
NSLog(@Name: %...@\nobject: %...@\nuser Info: %...@\n, [self name],
[self object], [self userInfo]);
// Call the original method, whose implementation was exchanged with
our own.
// Note: this ISN'T a recursive call, because this method should have
been called through dealloc.
NSParameterAssert(_cmd == @selector(dealloc));
[self mydealloc];
}
@end
Regards.
Gideon
On iPhone and 64-bit Mac, the linker enforces internal classes more strictly.
NSConcreteNotification is private, so you can't link to it or subclass it.
You can still get the class via runtime introspection like
NSClassFromString(), which for debugging purposes ought to be good enough.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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Re: Core Animation vs. Basic Cocoa Graphics
Thanks everyone for your help on this.
I started using an image cache - but that did not improve the performance as
much as I thought it should. I then removed the section of my code that
creates NSTrackingsAreas - and the improvement was immediately noticeable.
For the calendar grid I was creating an NSTrackingArea for each cell - in my
case (the calendar is for 7 days with 15 minutes per cell) there was 672
NSTrackingAreas.
I will have to look at alternative solutions to all these NSTrackingAreas to
improve the performance.
Thanks,
Mazen
On Mar 11, 2010, at 2:44 AM, jonat...@mugginsoft.com wrote:
On 10 Mar 2010, at 17:13, Mazen M. Abdel-Rahman wrote:
Hi All,
I was able to write a simple calendar view that uses basic cocoa graphics to
draw directly on the view (NSBezierPath, etc.). I actually use several
different paths for drawing the calendar (it's a weekly calendar) to allow
different horizontal line widths (hour, half hour, etc.). The calendar view
is inside a scroll view - and is actually about 3 times longer than the view
window. The main problem is that the scrolling is not smooth - and my
assumption is that it's because the NSBezier stroke functions have to be
constantly called to render the calendar.
For something as relatively simple as this would moving to core animation -
i.e. trying to render the calendar on a layer instead (I am still trying to
learn core animation) add performance benefits? And would it allow for
smoother scrolling?
As no one else has offered an opinion:
Moving to CA might offer benefits but you can improve the performance of your
existing code by using an image cache.
I do this for an NSView with animated NSBezierPath content and it works fine.
So I would draw my image when the view resizes and there after service -
(void)drawRect:(NSRect)rect from the image cache.
You only regen the cache when required, say on resize on content change.
The rough code outline below might help you get something up an running:
NSView subclass:
ivars:
NSRect _cacheRect;
NSImage *_imageCache;
BOOL _useImageCache;
- (void)drawRect:(NSRect)rect
{
if (_useImageCache) {
// validate our rect
rect = [self validateDrawRect:rect];
// if cache exists use it to update rect.
// otherwise draw into our rect
if (_imageCache) {
[self drawRectFromCache:rect];
return;
}
// draw to image cache
_cacheRect = [self bounds];
_imageCache = [[NSImage alloc] initWithSize:_cacheRect.size];
[_imageCache lockFocus];
}
// draw entire bounds rect
rect = [self bounds];
// draw it
NSBezierPath *bgPath = [NSBezierPath bezierPathWithRect:rect];
NSColor *endColor = [NSColor colorWithCalibratedRed:0.988f green:0.988f
blue:0.988f alpha:1.0f];
NSColor *startColor = [NSColor colorWithCalibratedRed:0.875f
green:0.875f blue:0.875f alpha:1.0f];
NSGradient *gradient = [[NSGradient alloc]
initWithStartingColor:startColor endingColor:endColor];
[gradient drawInBezierPath:bgPath angle:90.0f];
if (_useImageCache) {
[_imageCache unlockFocus];
// refresh view from cache
[self drawRectFromCache:rect];
}
}
/*
draw rect from cache
*/
- (void)drawRectFromCache:(NSRect)rect
{
[_imageCache drawInRect:rect fromRect:rect
operation:NSCompositeSourceOver fraction:1.0f];
}
/*
validate the draw rect
*/
- (NSRect)validateDrawRect:(NSRect)rect
{
NSRect boundsRect = [self bounds];
// if bounds rect and cache rect are not equal then
// the cache will have to be updated
if (!NSEqualRects(boundsRect, _cacheRect)) {
[self clearDisplayCache];
}
// if no display cache available then need to draw bounds into cache
if (!_imageCache) {
rect = boundsRect;
}
return rect;
}
Regards
Jonathan Mitchell
Developer
http://www.mugginsoft.com
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Re: View does not get refreshed after Window deminimized...
Hummm... looks like my approach has flaw. Thanks a ton, Cocoa.learner On Thu, Mar 11, 2010 at 11:52 PM, Quincey Morris quinceymor...@earthlink.net wrote: On Mar 11, 2010, at 06:50, cocoa learner wrote: And on this custom view I have a progress bar, that progressbar gets it's progress value from a NSThread. And I am using following function render the progressbar, from NSThread - [progBar performSelectorOnMainThread: (display) withObject: nil waitUntilDone: YES]; There seem to be two things wrong here. First, you must *not* set the value of the progress bar from a non-main thread. Setting the value causes a UI update, and that won't work properly unless it's done on the main thread. Instead, you must devise a method for the background thread to pass the desired value to the main thread, and have the main thread set the progress bar value. Second, it's rarely correct to invoke [NSView display] yourself. Typically, you would use [NSView setNeedsDisplay]. In any case, it's not clear why you think you need to cause the progress bar to redisplay. If you set the value properly from the main thread, it will redisplay itself as necessary. If you're having a problem with the animation not running, you just need to make sure you set (or re-set) the value often enough. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/cocoa.learner%40gmail.com This email sent to cocoa.lear...@gmail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Use of KVC Array operators
The operators mentioned on this page, particularly @unionOfSets. http://developer.apple.com/mac/library/documentation/cocoa/Conceptual/KeyValueCoding/Concepts/ArrayOperators.html I have the following Core Data object's setup ClassA ClassB ClassC relationA -- relationB -- relation C where each of the relations is a many to one [one class A, many class B, and one class B, many class C]. Not all ClassB's will have ClassC objects attached to them I have an instance of classA, and I want an NSArrayController with all the ClassC objects for all the ClassB objects that are related to that specific instance of ClassA, preferably in a way that uses KVO instead of programmatically updating with fetches/predicates/etc. What would be the right way to bind the NSArrayController, assuming the nib owner has an instance of classA: ie: bind content set to File Owner.instanceOfA.? Thanks, Eli ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Switching methods in private classes in Apple frameworks
On 2010 Mar 11, at 18:00, Gideon King wrote: This is really cool...so I can replace a method without being a subclass or category. I just need to chime in here, in case anyone missed it, to emphasize how *ALL-CAPS COOL* this is indeed. In the ReadMe of Apple's MethodReplacement.zip sample code, it states The trick is to define a category on the class whose method you want to replace. We have just learned that this sentence is incorrect. You do *not* need to define a category on the class whose method you want to replace. As Gideon showed in his code, the first argument of class_getInstanceMethod() need *not* be self, and therefore you can replace any method in *any* class, even a private one that's unknown to the SDK, with any other method in *any class*, even a different class. This makes Method Replacement much more powerful in debugging, and even patching bugs in Cocoa. I just sent Apple a wasn't helpful gram on that ReadMe. Thanks, Gideon. I hope you've found out who's sending that notification releasing your moc :) ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView _dataSourceValueForColumn:row: failure
On 11.03.2010, at 23:25, Corbin Dunn wrote:
http://www.corbinstreehouse.com/blog/2008/08/your-most-important-breakpoint-in-cocoa/
I've done what was told there. No difference. I just get
EXC_BAD_ACCESS in XCode status line and debugger's call stack list
shows:
objc_msgSend
- [NSTableView _dataSourceValueForColumn:row: ]
and a long chain is below, but there are no my project lines there.
All lines are from Cocoa itself. It looks like the window requires for
update after dataSource is already released.
This is how I call the modal window:
- (void) doModalWnd{
MyWnd *wnd = [[MyWnd alloc] init];
[[NSApplication sharedApplication] runModalForWindow:[wnd window]];
[wnd release];
}
- (IBAction) myBtnClick:(NSButton *)sender {
[self performSelector:@selector(doModalWnd)
withObject:nil
afterDelay:0];
}
There is such code within MyWnd.m:
- (void)windowWillClose:(NSNotification *)notification {
[[NSApplication sharedApplication] stopModalWithCode:NSCancelButton];
}
Is there anything criminal here?
Thanks.
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Making a beta version expire
For a beta version of an app, let's say I want to make sure that users cannot
use the beta for far too long, far longer than the app goes out of beta. (Note
that this case would in reality rarely occur. Most users would end up getting
notified of a new update far sooner. This is just a safety measure.)
So this is how I thought of doing it. Let's say I want to make the app expire
on January 1, 2011 (since I'm sure that I'll have a new beta release or go out
of beta before then). What do you think about putting the following code in
AppController's awakeFromNib?
---
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comp setDay:1]; [comp setMonth:1]; [comp setYear:2011];
NSCalendar *gregorian = [[NSCalendar alloc]
initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *expiryDate = [gregorian dateFromComponents:comps];
NSDate *now = [NSDate date];
if ([now compare:expiryDate] == NSOrderedDescending)
{
NSRunAlertPanel(@App Expired,@Visit website,@OK,nil,nil);
[NSApp terminate:self];
return;
}
---
Do you think this would work? I mean, it seems that it should, but one can
never be sure. Plus, this might be a lousy method, compared to what some of you
geniuses in here might have conjured up over the ages.
Thanks, U.
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Re: NSTableView _dataSourceValueForColumn:row: failure
On Mar 11, 2010, at 8:55 PM, Alexander Bokovikov wrote: Is there anything criminal here? Is the datasource for the NSTableView still a valid, non-released object when the window is closed? Eli ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Making a beta version expire
On Mar 11, 2010, at 11:03 PM, Ulai Beekam wrote: Do you think this would work? I mean, it seems that it should, but one can never be sure Why can’t you be sure? After reading your algorithm and convincing yourself that the code is correct, step through it in the debugger with expirations dates both in the past and the future. - Jim___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Switching methods in private classes in Apple frameworks
Thanks Jerry, I should mention that I did get this caveat note from Greg Parker (Apple's runtime wrangler): ..you must be cautious about what your replacement method does. In particular, you must not use any of the class's ivars and you must not call [super something]. As long as you follow those, you can swap in a method from any class, or even a C function with a matching argument list. So as long as you are careful about what you do, yes it is entirely possible to replace methods at will. I hope nobody misuses it, but it certainly was essential in my debugging - yes, I found it! Yay! Essentially what appeared to be happening was that I had a notification queued which had an object in it which held a reference to a managed object, but by the time the notification was destroyed, the managed object had turned to a fault (but was not released because the notification was causing it to be retained), and the managed object context had been released as part of the document deallocation, so when my object tried to access the managed object, it tried to fire the fault on a freed managed object context...or something like that. Even if that's not exactly right in every detail, I now have the conceptual understanding of the problem and believe I will be able to fix it. What a relief! Regards Gideon On 12/03/2010, at 1:54 PM, Jerry Krinock wrote: On 2010 Mar 11, at 18:00, Gideon King wrote: This is really cool...so I can replace a method without being a subclass or category. I just need to chime in here, in case anyone missed it, to emphasize how *ALL-CAPS COOL* this is indeed. In the ReadMe of Apple's MethodReplacement.zip sample code, it states The trick is to define a category on the class whose method you want to replace. We have just learned that this sentence is incorrect. You do *not* need to define a category on the class whose method you want to replace. As Gideon showed in his code, the first argument of class_getInstanceMethod() need *not* be self, and therefore you can replace any method in *any* class, even a private one that's unknown to the SDK, with any other method in *any class*, even a different class. This makes Method Replacement much more powerful in debugging, and even patching bugs in Cocoa. I just sent Apple a wasn't helpful gram on that ReadMe. Thanks, Gideon. I hope you've found out who's sending that notification releasing your moc :) ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Cocoa-dev Digest, Vol 7, Issue 294
Hi Michael,
You can use a text filed inside a scrollview. And use CAKeyFrameAnimation on
the layer of the text field on its 'position' property.
The idea is something like this:
You need to compute the appropriate duration for the animation from the size
of the text you have. The duration needs to be proportional to the length of
string. And appropriately compute the target position (again this is decided
by the length of the string).
HTH
Regards
Shripada
On 12/03/10 7:45 AM, cocoa-dev-requ...@lists.apple.com
cocoa-dev-requ...@lists.apple.com wrote:
From: Michael A. Crawford michaelacrawf...@me.com
Subject: Re: Need help with scrolling marquee
To: Cocoa-dev@lists.apple.com
Message-ID: 852bbcde-6e39-4e73-adcb-8c63f4d4d...@me.com
Content-Type: text/plain; charset=us-ascii
I played with the truncation property but to make that work you have to
continually modify the length of the string. I want to write the string to
the buffer once and then have CA scroll it for me at a constant speed I can
set. This is where I'm looking for assistance.
-Michael
On Mar 11, 2010, at 4:58 PM, Eric E. Dolecki wrote:
Isn't there a truncation property that handles this for a UILabel?
On Thu, Mar 11, 2010 at 4:53 PM, Graham Cox graham@bigpond.com wrote:
On 12/03/2010, at 5:23 AM, Michael A. Crawford wrote:
- (void)timerFireMethod:(NSTimer*)theTimer
{
#if 0
// Here I was using a periodic timer to animate the scroll. I noticed
that
// the animation wasn't smooth and then remembered that CA is supposed to
do
// the animating for me. So, I switched to trying the code below but
that
// doesn't work either. I'm really just grasping at straws here.
static CGPoint origin = {0.0f, 0.0f};
origin.x += 5.0f;
[scrollLayer scrollToPoint:origin];
#else
Hi Michael,
This is a classic naive mistake. You're incrementing the position by a
fixed amount each time the timer fires. Problem is, you can't guarantee that
the timer will fire exactly at the time it should, so your scrolling speed is
at the mercy of how busy things are, so will speed up and slow down.
Recall that speed is distance/time, so if you want a constant speed, you have
to work out how much distance the thing should have moved in the actual time
interval you got.
Roughly (typed into mail):
- (void)timerFireMethod:(NSTimer*) theTimer
{
NSTimeInterval elapsedTime = [NSDate timeIntervalSinceReferenceDate] -
m_startTime; // m_startTime ivar set when the animation began
CGFloat distance = m_speed * elapsedTime; // m_speed is the scrolling
speed in points per second
[thing setPosition:distance];
}
With this approach, the exact timing intervals don't matter - the position
will be correct. If things get busy what will happen is that the jumps
between positions will get a bit larger.
That said, Core Animation might do the job better, but I just wanted to point
out what the problem was with your original approach.
--Graham
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Re: Core Data: inverse relationship not updated until next Run Loop
On Mar 11, 2010, at 8:11 PM, Eric Lin wrote: In using Core Data, I was under the impression that if I do this: [department addEmployeesObject:employee] // department now has 1 employee [moc deleteObject:employee] Then department will end up with no employees, assuming that the inverse relationship is set correctly. But it turns out within the same run loop, if I inspect [department.employees count], then the value is 1. But in the next run loop, the value becomes 0, which is what it should be. Is my observation accurate or is something wrong? Deletes are propagated at the end of he current event, or at save time, depending how the MOC is configured. Jim ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core Animation vs. Basic Cocoa Graphics
Hi Mazen, how are you?
Maybe I can offer a tip on how to improve your performance: there is a
technique called BSP-Tree which divides the space in two equal parts
recursively, creating a tree of subdivisions. This technique improves the
search of which area of the space (in your case, the view) that a point is
located by constructing and traversing the binary tree. It's really neat!
As for the actual implementation, I am very new to the Cocoa framework and the
Objective-C language and I wouldn't be of much help with it. Maybe someone else
who is more experienced on the Mac ways of programming may be of more use to
you than me.
Hope that helps.
Best regards,
Alvaro Costa Neto
On Mar 11, 2010, at 11:13 PM, Mazen M. Abdel-Rahman wrote:
Thanks everyone for your help on this.
I started using an image cache - but that did not improve the performance as
much as I thought it should. I then removed the section of my code that
creates NSTrackingsAreas - and the improvement was immediately noticeable.
For the calendar grid I was creating an NSTrackingArea for each cell - in my
case (the calendar is for 7 days with 15 minutes per cell) there was 672
NSTrackingAreas.
I will have to look at alternative solutions to all these NSTrackingAreas to
improve the performance.
Thanks,
Mazen
On Mar 11, 2010, at 2:44 AM, jonat...@mugginsoft.com wrote:
On 10 Mar 2010, at 17:13, Mazen M. Abdel-Rahman wrote:
Hi All,
I was able to write a simple calendar view that uses basic cocoa graphics
to draw directly on the view (NSBezierPath, etc.). I actually use several
different paths for drawing the calendar (it's a weekly calendar) to allow
different horizontal line widths (hour, half hour, etc.). The calendar
view is inside a scroll view - and is actually about 3 times longer than
the view window. The main problem is that the scrolling is not smooth -
and my assumption is that it's because the NSBezier stroke functions have
to be constantly called to render the calendar.
For something as relatively simple as this would moving to core animation -
i.e. trying to render the calendar on a layer instead (I am still trying to
learn core animation) add performance benefits? And would it allow for
smoother scrolling?
As no one else has offered an opinion:
Moving to CA might offer benefits but you can improve the performance of
your existing code by using an image cache.
I do this for an NSView with animated NSBezierPath content and it works fine.
So I would draw my image when the view resizes and there after service -
(void)drawRect:(NSRect)rect from the image cache.
You only regen the cache when required, say on resize on content change.
The rough code outline below might help you get something up an running:
NSView subclass:
ivars:
NSRect _cacheRect;
NSImage *_imageCache;
BOOL _useImageCache;
- (void)drawRect:(NSRect)rect
{
if (_useImageCache) {
// validate our rect
rect = [self validateDrawRect:rect];
// if cache exists use it to update rect.
// otherwise draw into our rect
if (_imageCache) {
[self drawRectFromCache:rect];
return;
}
// draw to image cache
_cacheRect = [self bounds];
_imageCache = [[NSImage alloc] initWithSize:_cacheRect.size];
[_imageCache lockFocus];
}
// draw entire bounds rect
rect = [self bounds];
// draw it
NSBezierPath *bgPath = [NSBezierPath bezierPathWithRect:rect];
NSColor *endColor = [NSColor colorWithCalibratedRed:0.988f green:0.988f
blue:0.988f alpha:1.0f];
NSColor *startColor = [NSColor colorWithCalibratedRed:0.875f
green:0.875f blue:0.875f alpha:1.0f];
NSGradient *gradient = [[NSGradient alloc]
initWithStartingColor:startColor endingColor:endColor];
[gradient drawInBezierPath:bgPath angle:90.0f];
if (_useImageCache) {
[_imageCache unlockFocus];
// refresh view from cache
[self drawRectFromCache:rect];
}
}
/*
draw rect from cache
*/
- (void)drawRectFromCache:(NSRect)rect
{
[_imageCache drawInRect:rect fromRect:rect
operation:NSCompositeSourceOver fraction:1.0f];
}
/*
validate the draw rect
*/
- (NSRect)validateDrawRect:(NSRect)rect
{
NSRect boundsRect = [self bounds];
// if bounds rect and cache rect are not equal then
// the cache will have to be updated
if (!NSEqualRects(boundsRect, _cacheRect)) {
[self clearDisplayCache];
}
// if no display cache available then need to draw bounds into cache
if (!_imageCache) {
rect = boundsRect;
}
return rect;
}
Regards
Cannot find symbol(s) in release version
Hi, I met a issue that there are several link errors when build a project which can be built successfully in debug version. The detail information is below: 1. There are two projects, the targets of both projects is framework. 2. Project A dependents project B's output. 3. Project B builds successfully both Debug and Release version. 4. Project A builds successfully in debug version. 5. Project A builds failed in release version, there are several link errors, the error list is below:. Build QualityMgmt of project QualityMgmt with configuration Release Ld ../../twk_results_mac/ViewLocal/MC_out/Release/libQualityMgmt.dylib normal i386 cd /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt setenv MACOSX_DEPLOYMENT_TARGET 10.4 /Developer/usr/bin/g++-4.0 -arch i386 -dynamiclib -isysroot /Developer/SDKs/MacOSX10.4u.sdk -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../twk_results_mac/ViewLocal/MC_out/Release -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../msn_shared/mac/wkgpframework_sdk/third-party/codemesh/junc++ion/maco s/cpp/darwin-all-universal -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../mtl_sharedbuilds/mac/Release/bin -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../twk_results_mac/ViewLocal/MC_out/Release -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../mtl_sharedbuilds/mac/MediaIndexer/Release/bin -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../msn_shared/mac/wkgpframework_sdk/third-party/codemesh/junc++ion/maco s/models/javacore/cpp -L/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../mtl_sharedbuilds/mac/MediaIndexer/Release/bin -F/Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/.. /../twk_results_mac/ViewLocal/MC_out/Release -filelist /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/../. ./twk_results_mac/ViewLocal/MC_inter/QualityMgmt.build/Release/QualityMg mt.build/Objects-normal/i386/QualityMgmt.LinkFileList -install_name @executable_path/libQualityMgmt.dylib -mmacosx-version-min=10.4 /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/twk_results_mac/ViewLo cal/MC_out/Release/TaskScheduler.framework/TaskScheduler /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/twk_results_mac/ViewLo cal/MC_out/Release/AvidCoreThreads.framework/AvidCoreThreads -framework Carbon -framework CoreServices /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/twk_results_mac/ViewLo cal/MC_out/Release/libStringFunctions.a /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/twk_results_mac/ViewLo cal/MC_out/Release/libTimeFunctions.a -lJavaMISupport -lxmogrt-g++G.3 -single_module -compatibility_version 1 -current_version 1 -o /Users/sow11_Mac1/dev.ws.FlyingCircus_dxsow11_Int/xplat/QualityMgmt/../. ./twk_results_mac/ViewLocal/MC_out/Release/libQualityMgmt.dylib Undefined symbols: TaskScheduler::addTask(TaskSchedulerTask*, bool), referenced from: QualityMatch::CQFXUpdateAccumulator::CQFXUpdateAccumulatorImpl::addChann el(QualityMatch::CQFXChannelKey const)in CQFXUpdateAccumulator.o TaskSchedulerTask::TaskSchedulerTask(char const*, int, boost::functionvoid ()(), std::allocatorvoid , bool, int, bool), referenced from: QualityMatch::CQFXUpdateAccumulator::CQFXUpdateAccumulatorImpl::addChann el(QualityMatch::CQFXChannelKey const)in CQFXUpdateAccumulator.o TaskScheduler::instance(), referenced from: QualityMatch::CQFXUpdateAccumulator::CQFXUpdateAccumulatorImpl::addChann el(QualityMatch::CQFXChannelKey const)in CQFXUpdateAccumulator.o ld: symbol(s) not found collect2: ld returned 1 exit status Thanks, Wade ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Load data from csv file and plot line graph
For the code example,
CPTestAppScatterPlotController.m
that I downloaded from core-plot Google website, a line graph can be
plotted based on randomly
generated initial data x, y.
// Add some initial data
NSMutableArray *contentArray = [NSMutableArray
arrayWithCapacity:100];
NSUInteger i;
for ( i = 0; i 60; i++ ) {
id x = [NSNumber numberWithFloat:1+i*0.05];
id y = [NSNumber numberWithFloat:1.2*rand()/
(float)RAND_MAX + 1.2];
[contentArray addObject:[NSMutableDictionary
dictionaryWithObjectsAndKeys:x, @x, y, @y, nil]];
}
self.dataForPlot = contentArray;
Then i modified the code,
NSString *filePath = [[NSBundle mainBundle]
pathForResource:@ECG_Data
ofType:@csv];
NSString *myText = [NSString stringWithContentsOfFile:filePath
encoding:NSUTF8StringEncoding error:nil ];
NSScanner *scanner = [NSScanner scannerWithString:myText];
[scanner setCharactersToBeSkipped:[NSCharacterSet
characterSetWithCharactersInString:@\n, ]];
NSMutableArray *newPoints = [NSMutableArray array];
float time, data;
while ( [scanner scanFloat:time] [scanner scanFloat:data]
) {
[newPoints addObject:
[NSMutableDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:time], @time,
[NSNumber numberWithFloat:data], @data,
nil]];
}
self.dataForPlot = newPoints;
It seems that my code could not read the data from csv file.
(there are two cols of the data in ECG_Data.csv, one for time and one for
data)
Can anyone give me some suggestion???
Thanks
regards,
Ni Lei
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Re: Better sorting using threads?
Does Cocoa have sorted containers so that an object can be inserted in sorted order? If so it seems like this would be far less expensive. --aj From: Ken Ferry kenfe...@gmail.com To: Ken Thomases k...@codeweavers.com Cc: Cocoa-Dev List cocoa-dev@lists.apple.com Sent: Wed, March 10, 2010 11:37:31 PM Subject: Re: Better sorting using threads? On Wed, Mar 10, 2010 at 10:34 PM, Ken Thomases k...@codeweavers.com wrote: On Mar 10, 2010, at 11:50 PM, Graham Cox wrote: I've got a situation where sorting an array using sort descriptors is slow. The number of items being sorted is not enormous - about 2,000 - but there could be several sort descriptors and the main string one is using a localized and natural numeric comparison. I cache the results and take a lot of care only to resort when needed, but that doesn't help on the first run through which often takes in the order of 10-20 seconds. The interface that displays the results therefore beachballs for this time. I'm considering using threads to help, where a thread is used to perform the sort itself, and until the sort has finished the UI can display a busy indicator (indeterminate circular progress indicator) next to the selected row in the table. This is in the master table of a master-detail interface where the detail displays the sorted items selected. While busy the detail view can be blank or show the previous arrangement. So my question is, is threading a good solution? While NSMutableArray isn't marked as thread-safe, the array in question can be arranged to not be used outside of the sorting thread, and only substituted for the returned sorted items when complete. Or can array sorting not be done on a thread at all? This is a sensible solution. NSMutableArray is safe so long as only one thread is accessing it at a time. Even more specifically, NSMutableArray is safe so long as either (1) no thread is mutating the array (but an arbitrary number are accessing it) (2) only one thread is accessing the array (and possibly mutating it) Same deal for NSDictionary, and, for that matter, NSImage. Also, rest of email, seconded. :-) -Ken However, sorting 2000 items should not take 10-20 seconds! Have you profiled to find out what's actually taking the time? If a property of the objects has to be massaged into another form before the comparison can take place, it can be a performance win to do that massaging once for each object before the sort and cache the result. Otherwise, it may end up being performed over and over, each time one object is compared to another. (I wouldn't worry about the localized, numeric comparison of strings, though. I don't think there's a good way to preflight those, and I wouldn't think that would be a significant factor in the slowness. But, of course, don't trust my intuition -- measure.) Regards, Ken ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com This email sent to kenfe...@gmail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/andrew_a_james%40yahoo.com This email sent to andrew_a_ja...@yahoo.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core Data: inverse relationship not updated until next Run Loop
In using Core Data, I was under the impression that if I do this: [department addEmployeesObject:employee] // department now has 1 employee [moc deleteObject:employee] Then department will end up with no employees, assuming that the inverse relationship is set correctly. But it turns out within the same run loop, if I inspect [department.employees count], then the value is 1. But in the next run loop, the value becomes 0, which is what it should be. Is my observation accurate or is something wrong? Deletes are propagated at the end of he current event, or at save time, depending how the MOC is configured. But you can call [moc processPendingChanges] directly after the delete to propagate the changes immediately. Frank ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSServices - Validation bug
On Mar 8, 2010, at 5:02 AM, tr...@atheeva.com wrote: I have some queries regarding Services menu validation . I would like to enable different services provided by my app based on whether a file or folder is selected in the Finder. I have set NSFilenamesPboardType as the send type for the services.I have gone through the - (id) validRequestorForSendType:(NSString*)sendType returnType:(NSString *)returnType method but my issue is that the validation there seems to be done based on the sendType and return type. In my case , the selected file and folder pasteboard type is the same and I cannot determine whether the selected item in the Finder is a file or folder during the validation process(This is before the actual service gets invoked i.e when the services menu is being shown to the user )? So my question is that is there any way I can get some info about the selected item in the Finder and validate the different service menus offered by my application based on some info regarding the item rather than the basic validation of the send and return types ? You can only validate by the type in your service validation method, not the contents of the pasteboard. You can switch to using more specific UTIs for our service (if you only, for example, want to accept a file, folder, or package). You can also use NSRequiredContext in your service specification to restrict service availability based on pasteboard content. - Jim___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Switching methods in private classes in Apple frameworks
On Mar 11, 2010, at 8:58 PM, Gideon King wrote: So as long as you are careful about what you do, yes it is entirely possible to replace methods at will. I hope nobody misuses it, but it certainly was essential in my debugging - yes, I found it! Yay! Where careful about what you do includes only use this in debugging code or non-production instrumentation, sure Do *not* ship such shenanigans in production code. One software update later and suddenly the presumptions made about that internal method you are replacing/overriding/augmenting are no longer true and *boom*. (been there, done that, the scars run deep -- seriously, don't ship it that way. :) b.bum ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Better sorting using threads?
On Mar 11, 2010, at 11:15 AM, Andrew James wrote: Does Cocoa have sorted containers so that an object can be inserted in sorted order? If so it seems like this would be far less expensive. Depends entirely on need. Keeping a container sorted on insert can be quite expensive; potentially considerably more expensive than doing a single batch sort at the end. On-the-fly sorted containers are generally only applicable when updates to the container will be frequently interleaved with read operations. b.bum ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [MEET] CocoaHeads-NYC tonight - NSOperation
Hi Andy, Can you please record the discussion and presentation since the people like me non US Residents can view them. I am really looking for such topic. Thanks regards Mustafa Shaik On Fri, Mar 12, 2010 at 5:11 AM, Andy Lee ag...@mac.com wrote: Sorry for the two hours' notice... Marc van Olmen will give the talk entitled Introduction to NSOperation that he was unable to give last month. I have no doubt it'll be worth the wait. As usual: (1) Please feel free to bring questions, code, and works in progress. We have a projector and we like to see code and try to help. (2) We'll have food and beer afterwards. (3) If there's a topic you'd like presented, let us know. (4) If *you'd* like to give a talk, let me know. Thursday, March 11 6:00 - 8:00 Downstairs at Tekserve, on 23rd between 6th and 7th http://tekserve.com/about/hours.php for directions and map Everyone's welcome. Just tell the person at the front you're there for CocoaHeads. Hope to see you there! --Andy ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/symadept%40gmail.com This email sent to symad...@gmail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Better sorting using threads?
Does Cocoa have sorted containers so that an object can be inserted in sorted order? If so it seems like this would be far less expensive. Probably the best thing to do if you want this is to maintain the sort yourself by inserting new objects in the correct position. You can find the position using -[NSArray indexOfObject:inSortedRange:options:usingComparator:]. That's two lines instead of one to add an object to an array, which is not bad. That method is new in 10.6, but something similar has been in CoreFoundation for a while. CFArrayBSearchValues is usable on NSArray since CFArray is bridged. You can also look at -[NSArray sortedArrayHint]. The deal there is that you extract an opaque hint from a sorted array, change the array, and resort passing in the hint. This is optimized for the case when the array is still mostly sorted, but with some things out of place. -Ken On Thu, Mar 11, 2010 at 10:38 PM, Bill Bumgarner b...@mac.com wrote: On Mar 11, 2010, at 11:15 AM, Andrew James wrote: Does Cocoa have sorted containers so that an object can be inserted in sorted order? If so it seems like this would be far less expensive. Depends entirely on need. Keeping a container sorted on insert can be quite expensive; potentially considerably more expensive than doing a single batch sort at the end. On-the-fly sorted containers are generally only applicable when updates to the container will be frequently interleaved with read operations. b.bum ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/kenferry%40gmail.com This email sent to kenfe...@gmail.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTextView backed by core data, undo problems
Thanks, Kyle. I figured the answer would be something like this. OK, then I'll need to rethink the architecture a bit. I was aiming for an Xcode-like interface with potentially multiple views to the same file content, but without using 'updates continuously' this is going to be more difficult to achieve. If anyone has any good suggestions, I'd be delighted to hear them. Thanks again, Martin On Mar 11, 2010, at 8:52 PM, Kyle Sluder wrote: On Thu, Mar 11, 2010 at 7:50 AM, Martin Hewitson martin.hewit...@aei.mpg.de wrote: The nasty little problem I have is that if I edit the contents of a file via the NSTextView, then do 'undo', the cursor (selection) in the NSTextView jumps to the end of the document, and the scrollview jumps to the top. Almost as if the whole text has been replaced. The only way I can avoid this so far is to set the binding so that it doesn't 'update continuously'. One other symptom is that each undo removes the last character typed, whereas with 'update continuously' off I get the more common behaviour of undoing the last word or at least recent group of actions. By setting the value continuously you're breaking the text view's undo coalescing. Doing this correctly is not going to be an easy task. You will need to learn much about the Cocoa text system. The 30,000ft overview: you want to mutate an NSTextStorage hooked up to the text view, rather than simply setting a property on the model object. Core Data and KVC don't support this pattern natively; you will need to write code, and it can get hairy. --Kyle Sluder Martin Hewitson Albert-Einstein-Institut Max-Planck-Institut fuer Gravitationsphysik und Universitaet Hannover Callinstr. 38, 30167 Hannover, Germany Tel: +49-511-762-17121, Fax: +49-511-762-5861 E-Mail: martin.hewit...@aei.mpg.de WWW: http://www.aei.mpg.de/~hewitson ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
