Re: Asynchronously mounting a remote file server?
On 14 Jun 2013, at 06:40, Jens Alfke j...@mooseyard.com wrote: On Jun 13, 2013, at 2:17 PM, Rick Mann rm...@latencyzero.com wrote: I'd like to be smarter about this in my own apps. Is there a test I can perform before accessing aliases I've stored, or an async way to open/read from files that won't block the main thread? It’s not opening or reading from the file that’s the slow part, it’s resolving the alias, which happens first. (Aliases aren’t automatic or transparent like symlinks; something has to explicitly recognize a file as an alias and then resolve it to get the destination file’s location.) I know the alias APIs have changed in the last few years, and I don’t know the new ones, but I’d imagine there is an async variant. Once you’ve resolved the alias, you can open/read from the file as normal. If you think the actual file I/O might still be too slow, you can do it on a background thread. There's no async API. I filed a radar asking for this relatively recently and was recommended to shove such tasks onto the low priority GCD queue instead. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: -[NSManagedObjectContext performBlock:] concurrent or serial?
On 14 Jun 2013, at 00:03, davel...@mac.com wrote: On May 31, 2013, at 7:40 PM, Rick Mann rm...@latencyzero.com wrote: Hi. If I issue a bunch of -performBlock: calls on a particular Managed Object Context, will they execute serially or concurrently? Thanks, -- Rick I'm assuming serially and I would like to know too so I was hoping someone would provide a definitive answer. Did I miss it or did nobody respond to this? Core Data guarantees that the tasks *won't* be executed in parallel. I can find no documented guarantee that they'll be performed in the *same order* as they were *enqueued* though. But, in practice MOCs implement their queue internally using a GCD serial queue, so you'll get the same serialization behaviour as that. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
On 14 Jun 2013, at 03:00, Graham Cox graham@bigpond.com wrote: No offence, but when a programmer says this, all they're doing is revealing their own inexperience. I mean that in a friendly way; I've been there many times myself. There *is* a way, you just have to figure it out (or ask someone to help you figure it out). No offence guy, but seriusly I can’t. We have a compatible UIKit layer which can run on OS X. In order to mantain compatibility I need to handle UIApplication and UIScreen singleton; morehower I need to manage UIAppearance. This thing can’t work on with multiple projects at the same time so in order to work with it I need to isolate each project/UIKit instance/process from the other. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
On Jun 14, 2013, at 1:15 AM, Daniele Margutti m...@danielemargutti.com wrote: No offence guy, but seriusly I can’t. We have a compatible UIKit layer which can run on OS X. In order to mantain compatibility I need to handle UIApplication and UIScreen singleton; morehower I need to manage UIAppearance. This thing can’t work on with multiple projects at the same time so in order to work with it I need to isolate each project/UIKit instance/process from the other. So your response to a problem entirely of your own making is to try to whip a system framework into doing something it is very much not designed to do. Step back and take a deep breath. You need to remove your blinders and rationally analyze your options. AppKit simply does not and will not work the way you want it to. You can't just split code into subprocesses when that code might be sharing untold amounts of state and memory. It would be *astronomically* more difficult to accomplish this than it would be to 1) either fix your UIKit clone or 2) just stop treating the Mac as a second-class citizen and use AppKit natively for your UI. Both of those are under your control; the code within AppKit is not. --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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
The model you are mentioning seems a lot like multiple users accessing a database on a remote server. In this analogy, the database is your document. The users accessing that one database are the other apps that are accessing it. On Jun 13, 2013, at 2:29 PM, Daniele Margutti wrote: On 13 Jun 2013, at 20:05, Tom Davie tom.da...@gmail.com wrote: The best way is to write an application that's stable. The only reason browsers started doing this was because they had to deal with 3rd party code (e.g. flash) that was giving them a terrible reputation for instability. If you're controlling the entire app, you have no reasonable reason to do this. Simply fix your crasher bugs instead. Overall stability is not my reason to evaluate this kind of a architecture; for a particular reason each document should interact with an external singleton class but each singleton must be unique around the app; think about UIApplication on iOS; I need to work with a similar thing so I need to “run” multiple projects and each one must see a single instance of this object. I cannot change this kind for several reason, so an architecture like this could be a great answer to enable multiple documents support in my application. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/zav%40mac.com This email sent to z...@mac.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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Asynchronously mounting a remote file server?
On Jun 14, 2013, at 12:22 AM, Mike Abdullah mabdul...@karelia.com wrote: There's no async API. I filed a radar asking for this relatively recently and was recommended to shove such tasks onto the low priority GCD queue instead. That sounds reasonable, as long as that function is safe to call on a background thread of course. (I wasn't sure, since it may require user interaction such as getting credentials for a file server, or that “Do you want to locate the file?” alert.) —Jens ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Asynchronously mounting a remote file server?
On 14 Jun 2013, at 18:06, Jens Alfke j...@mooseyard.com wrote: On Jun 14, 2013, at 12:22 AM, Mike Abdullah mabdul...@karelia.com wrote: There's no async API. I filed a radar asking for this relatively recently and was recommended to shove such tasks onto the low priority GCD queue instead. That sounds reasonable, as long as that function is safe to call on a background thread of course. (I wasn't sure, since it may require user interaction such as getting credentials for a file server, or that “Do you want to locate the file?” alert.) My understanding is the bookmarks API is completely threadsafe. Any UI that appears as a result is actually handled outside of the calling process. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
On Jun 14, 2013, at 1:15 AM, Daniele Margutti m...@danielemargutti.com wrote: No offence guy, but seriusly I can’t. We have a compatible UIKit layer which can run on OS X. In order to mantain compatibility I need to handle UIApplication and UIScreen singleton; morehower I need to manage UIAppearance. This thing can’t work on with multiple projects at the same time so in order to work with it I need to isolate each project/UIKit instance/process from the other. I’m going to ignore the issue of whether it even makes sense to try to bash code and UI designed for iOS into running on Mac OS. Apps that are ported across platforms by brute force this way rarely work well. At a technical level, I think your best bet is to use state-switching. Use a model where one app instance is active at a time. Each one has its own instances of the singletons (UIApplication, etc.) and when an app instance is active, the singleton accessors like [UIApplication application] return the object matching that app instance. Now you have only one piece of global state, the current-app-instance. What you need to do is switch that appropriately based on which app is going to be running next. The obvious thing is before handing an event, determine which app it’s aimed at (probably based on which app owns the appropriate NSWindow) and set that one. The harder task is to set the current-app when other runloop-based calls happen, like timers and delayed-performs and NSURLConnection delegate calls and so forth. Wrapping all of those APIs would be a real pain. One possible solution is to create a new thread with its own runloop for each app instance, and always run it on that thread. Then in fact you can resolve all your singletons by using the NSThread dictionary to look up state. You just have to handle events by looking up the target app’s thread, posting the event to that thread’s runloop, and then blocking till it completes. (This also avoids trouble with thread-safety because it ensures that only one of those app UI threads can be handling UI events at a time.) This still sounds challenging, but it’ll be a million times easier than trying to run multiple processes. —Jens ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
On Jun 14, 2013, at 11:17 AM, Jens Alfke wrote: This also avoids trouble with thread-safety because it ensures that only one of those app UI threads can be handling UI events at a time. But isn't it still true that many UI-oriented APIs can only be safely called on the main thread, regardless of anything you may do to prevent more than one thread at a time running the UI? -- Scott Ribe scott_r...@elevated-dev.com http://www.elevated-dev.com/ (303) 722-0567 voice ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Multiple Observations
- (void)awakeFromNib {
[self.doc addObserver:self
forKeyPath:@currentPath
options:NSKeyValueObservingOptionNew |
NSKeyValueObservingOptionOld
context:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context {
if (object == self.doc [keyPath isEqualToString:@currentPath]
self.outlineView != nil) {
[self.outlineView reloadData];
//Debugging
static NSUInteger dingCount = 0;
dingCount++;
NSLog(@dingCount = %lu, dingCount);
}
}
³currentPath² property in doc gets set once. Observation gets dinged about
200 times. Removing the ³reloadData² didn¹t affect this. Same observer in
another file gets dinged once, like it should. Stack trace always leads
back to where currentPath is set in doc. Any theories on what could cause
this observer to have diarrhea?
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Re: Multiple Observations
On Jun 14, 2013, at 13:06 , Gordon Apple g...@ed4u.com wrote: ³currentPath² property in doc gets set once. Observation gets dinged about 200 times. Removing the ³reloadData² didn¹t affect this. Same observer in another file gets dinged once, like it should. Stack trace always leads back to where currentPath is set in doc. Any theories on what could cause this observer to have diarrhea? If the stack trace indicates that the observation is triggered by the currentPath setter, then you're looking for your bug in the wrong place. The problem is (prima facie) that the setter is being invoked multiple times. The cause is further up the call stack. BTW, I hope your real code isn't (a) using a nil context and (b) failing the check the context in the observation method. ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Multiple Observations
On Jun 14, 2013, at 1:06 PM, Gordon Apple wrote:
- (void)awakeFromNib {
[self.doc addObserver:self
forKeyPath:@currentPath
options:NSKeyValueObservingOptionNew |
NSKeyValueObservingOptionOld
context:nil];
}
- (void)observeValueForKeyPath:(NSString *)keyPath
ofObject:(id)object
change:(NSDictionary *)change
context:(void *)context {
if (object == self.doc [keyPath isEqualToString:@currentPath]
self.outlineView != nil) {
[self.outlineView reloadData];
//Debugging
static NSUInteger dingCount = 0;
dingCount++;
NSLog(@dingCount = %lu, dingCount);
}
}
³currentPath² property in doc gets set once. Observation gets dinged about
200 times. Removing the ³reloadData² didn¹t affect this. Same observer in
another file gets dinged once, like it should. Stack trace always leads
back to where currentPath is set in doc. Any theories on what could cause
this observer to have diarrhea?
If it's not multiple calls to the setter, could it be multiple calls to
awakeFromNib? What does the observationInfo on self.doc look like?
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Keeping UIScrollView content centered
As I'm experimenting with how to implement pinch and rotate gestures in a UIScrolLView, I set up a non-autolayout (traditional) pinch-zooming UIScrollView with a UIImageView inside it. I followed the instructions here: http://developer.apple.com/library/ios/#documentation/windowsviews/conceptual/UIScrollView_pg/ZoomZoom/ZoomZoom.html And looked at the TapToZoom example. This mostly works, but if I zoom way out, so that my image (which has an aspect ratio that doesn't match the screen) is completely visible, it's not centered in the view; it's pinned to the upper-left. The Photos app seems to nicely keep the image centered. What's the right way to do this? -- Rick ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: assertion failure from NSScrollView
On 6/12/2013 6:51 PM, James Walker wrote: In Lion 10.7.4, if the General preference pane has set Show scroll bars to Automatically based on input device, then when my window appears I see the following mess in the log. The other two preference alternatives don't cause this. Any idea what's going on? (The input device is a mouse, by the way.) Never mind, I found the problem. It was code equivalent to [[NSScrollView new] initWithFrame: someRect] thus initializing the object twice. -- James W. Walker, Innoventive Software LLC http://www.frameforge3d.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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Isolated process for each NSDocument of my app
On 14/06/2013, at 6:15 PM, Daniele Margutti m...@danielemargutti.com wrote: No offence guy, but seriusly I can’t. We have a compatible UIKit layer which can run on OS X. In order to mantain compatibility I need to handle UIApplication and UIScreen singleton; morehower I need to manage UIAppearance. This thing can’t work on with multiple projects at the same time so in order to work with it I need to isolate each project/UIKit instance/process from the other. That's exactly the sort of thing I'm referring to - for whatever reason your design is incorrect, so you're now trying to fix that by adding more incorrectness. The split between your controller and view layer is in the wrong place. By refactoring you can replace your view layer by a native OSX one and not attempt to add a layer ON TOP of your view layer to make Mac OSX look like UIKit. While I haven't had much experience on iOS yet, I have made a few simple apps that work across iOS and Mac OS and by and large these share 70% or more of the controller and model code. Most of the view stuff comes from xibs and so in reality there isn't that much code that differs. I would accept that your app is a lot more complicated than mine, but nevertheless the right approach should make cross-platform deployment reasonably straightforward. It's much easier than, say, Windows/Mac cross-platform, at least the whole thing can be in Cocoa. --Graham ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Combining pan, zoom, and rotate gestures into one?
The Apple Maps application allows you to pan, zoom, and rotate in a single two-finger gesture. Is that done with three gesture recognizers all operating simultaneously? Or are they just handling the touches directly? I don't see how to get a combined transform out of the three separate gesture recognizers. -- Rick ___ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Combining pan, zoom, and rotate gestures into one?
Isn't it a matter of implementing this delegate method?
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer
*)otherGestureRecognizer
{
return YES;
}
David
On Jun 14, 2013, at 5:41 PM, Rick Mann rm...@latencyzero.com wrote:
The Apple Maps application allows you to pan, zoom, and rotate in a single
two-finger gesture.
Is that done with three gesture recognizers all operating simultaneously? Or
are they just handling the touches directly?
I don't see how to get a combined transform out of the three separate gesture
recognizers.
--
Rick
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Re: Combining pan, zoom, and rotate gestures into one?
On Jun 14, 2013, at 18:09 , David Rowland rowla...@sbcglobal.net wrote:
Isn't it a matter of implementing this delegate method?
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer
*)otherGestureRecognizer
{
return YES;
}
I was thinking that was insufficient, because to rotate properly, you need a
point about which to rotate. The rotation gesture by itself doesn't give you
that (it only provides a rotation).
Actually, I'm wrong about that. All gestures give a location value. But none of
the examples I saw rotated about that location.
I'll have to continue experimenting.
--
Rick
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Re: Combining pan, zoom, and rotate gestures into one?
So, this sort of works, and fails spectacularly.
The problem is that I can't specify the order in which each gesture's values
are applied to the view's transform.
So, I end up with a side-to-side panning gesture making the image move
up-and-down when it's rotated about 90°.
On Jun 14, 2013, at 18:09 , David Rowland rowla...@sbcglobal.net wrote:
Isn't it a matter of implementing this delegate method?
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer
*)otherGestureRecognizer
{
return YES;
}
David
On Jun 14, 2013, at 5:41 PM, Rick Mann rm...@latencyzero.com wrote:
The Apple Maps application allows you to pan, zoom, and rotate in a single
two-finger gesture.
Is that done with three gesture recognizers all operating simultaneously? Or
are they just handling the touches directly?
I don't see how to get a combined transform out of the three separate
gesture recognizers.
--
Rick
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--
Rick
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Re: Combining pan, zoom, and rotate gestures into one?
Assuming you want to rotate about the center of the object, you probably want
to translate the object so it's center is at the origin, do the rotation, and
then do the inverse of the translation. If you do that, the order of the
recognizers shouldn't matter.
Thanks,
Jon
On Jun 14, 2013, at 7:26 PM, Rick Mann rm...@latencyzero.com wrote:
So, this sort of works, and fails spectacularly.
The problem is that I can't specify the order in which each gesture's values
are applied to the view's transform.
So, I end up with a side-to-side panning gesture making the image move
up-and-down when it's rotated about 90°.
On Jun 14, 2013, at 18:09 , David Rowland rowla...@sbcglobal.net wrote:
Isn't it a matter of implementing this delegate method?
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer
*)otherGestureRecognizer
{
return YES;
}
David
On Jun 14, 2013, at 5:41 PM, Rick Mann rm...@latencyzero.com wrote:
The Apple Maps application allows you to pan, zoom, and rotate in a single
two-finger gesture.
Is that done with three gesture recognizers all operating simultaneously?
Or are they just handling the touches directly?
I don't see how to get a combined transform out of the three separate
gesture recognizers.
--
Rick
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--
Rick
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