Why is NSCollectionViews drawRect called first instead of subview (isOpaque:YES) bug?

[Benjamin Rindt]

Hey guys,
I have a serious problem with the CollectionView and I don’t understand its 
behavior.
My Project has a Splitview into 2 Views, one is a Scrollview with a 
CollectionView the one is a normal NSView with background image. 

The other one with the CollectionView has multiple items with own Views. 

The view of the item and the other „static“ NSView with background image have a 
subview of MeteringView of the MatrixMixerTest example project from Apple. This 
Metering View is showing Audio levels passed through it in a Meter. The View 
has isOpaque:Yes.

The problem now is, those Meteringviews get redrawn with a timer to represent 
the Audio Levels but MeteringView is quite efficient to just draw the 
difference area what changed. In the „static“ NSView with background this works 
fine because isOpaque of MeteringView is preventing drawRect of the static View 
to draw again its background image to draw again, because if it does the meter 
is gone and just the currently changing parts are getting drawn.

The CollectionView works differently, there the drawRect of the Item gets 
somehow called first causes its background color to redraw hiding my meter. But 
why does it? MeteringView is added in the same way as a subview and 
setNeedsDisplay is called in MeteringView to redraw metering view and isOpaque 
to prevent the „parent“ Views to redraw.

I don’t know how to solve this, any ideas? I don’t think this is a bug but I 
don’t know why drawRect of the CollectionView Item is called in the first 
place. 

Thanks - Benjamin
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NSCollectionView item crashes when bound

[Benjamin Rindt]

Hey guys I'm really grinding with the NSCollectionView when its bound. I had a 
running collection view but wanted to use bindings, I looks like it should 
work, but it doesn't. This is written just in code not in IB. 



Hope you guys can help :)



The problem is, the View is displayed correctly, but as soon as I try to bind a 
property in the newItemForRepresentedObject method, it is trying to call 
setChannelID (I can see it in the console outputting "hello" all the time, but 
keeps stuck in the else part of the if statement. It never gets to make the if 
true, always trying to set it. There is no output after the self.channelID = 
chanID; command, there is just another hello. I think the ChannelView property 
is not holding the data. The program crashes after 10 seconds trying to set the 
value. It should be possible to do this, others have obviously bound in the 
newItemForRepresentedObject.

Anyway, any help is appreciated this is the code:

ChannelView

#import 

@interface ChannelView : NSView

@property (readwrite, nonatomic, copy) NSString *channelName;
@property (readwrite, nonatomic, copy) NSNumber *channelID;

@property (readwrite) NSTextField *channelNameField;
@property (readwrite) NSTextField *deviceChannelField;



@end


@implementation ChannelView

- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:NSMakeRect(0, 0, 300, 500)];
if (self) {
// Initialization code here.

ColorView *test = [[ColorView alloc] initWithFrame:NSMakeRect(0, 0, 100, 
100)];

self.channelNameField = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 
100, 20)];
self.deviceChannelField = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 
50, 100, 20)];

[self addSubview:test];
[self addSubview:self.channelNameField];
[self addSubview:self.deviceChannelField];
}

return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder
{
self = [super initWithCoder:aDecoder];


//add die teile


return self;
}

- (void)drawRect:(NSRect)dirtyRect
{
// Drawing code here.
}


// setters.


 -(void)setChannelID:(NSNumber *)chanID
{
//NSLog(@"hallo");
if (self.channelID == chanID) {
return;
NSLog(@"da");
}
else {
NSLog(@"hello"); //just this in debug output
//self.channelID = [chanID copy];
NSLog(@"no output");
self.channelID = chanID;
NSLog(@"chanid %d current: %d", chanID.intValue, self.channelID.intValue); 
//never shown in debug
[self.deviceChannelField setStringValue:[NSString 
stringWithFormat:@"%d",self.channelID.intValue]];
}
} 

@end
The piece of my subclassed NSCollectionView

- (NSCollectionViewItem *)newItemForRepresentedObject:(ChannelsToMixes*)object
{
NSCollectionViewItem *item = [super newItemForRepresentedObject:object];
// ChannelView *view = (ChannelView *)[item view];

NSLog(@"cahnnelid: %d",object.channelID.intValue);

// [view bind:@"title" toObject:object withKeyPath:@"title" options:nil];

 [item.view bind:@"channelID" toObject:object withKeyPath:@"channelID" 
options:nil];
//NSLog(@"test");

//NSLog(@"%@",object);

return item;
}


self.collectionView = [[ChannelCollectionView alloc] 
initWithFrame:NSMakeRect(10, 0, width, self.splitview.frame.size.height)];
[self.collectionView setItemPrototype:[ChannelViewItemController new]];
[self.collectionView setMaxNumberOfRows:1];
[self.collectionView setAutoresizingMask:(NSViewMinXMargin | NSViewWidthSizable 
| NSViewMaxXMargin | NSViewMinYMargin  | NSViewHeightSizable| 
NSViewMaxYMargin)];
[self.collectionView setAutoresizesSubviews:YES];
[self.collectionView bind:NSContentBinding toObject:self.channelController 
withKeyPath:@"arrangedObjects" options:nil];
ChannelViewItemController:

@implementation ChannelViewItemController

-(void)loadView {

[self setView:[[ChannelView alloc] initWithFrame:NSZeroRect]];
}

@end
The actual value is passed to the setter method, but just not held by the 
property I think, but why? Tried multiple properties, strong, readwrite atomic 
or nonatmoic but thats not helping.

What is the thing to get the NSCollectionView set up with bindings?



Thanks 

Benjamin
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Arraycontroller and CoreData

[Benjamin Rindt]

Hey guys,

I'm really confused with the array controller and core data. I don't know what 
I have to use to get what I want.
My program has for now a CollectionView which is populated by a core data fetch 
request.

If I use an arrayController, I don't have to make this fetch do I? I can tell 
the array controller to fetch: ?

Next thing is, when new Items are added to the collection view, it should 
automatically change.
A binding of the collection view is enough? Something like [collectionview 
bind: toObject:….]

And, for now I add data to my core data database with 
insertNewObjectForEntityForName. Is that okay or should I add it with the array 
controller's add oder insertObject methods? The new entries have to keep their 
relationships and I don't know how I can define them with the array controller 
methods. 


Thanks in advance!
Benjamin
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scrollPoint in NSScrollView does not scroll

[Benjamin Rindt]

Hey,
I'm trying this for I think over 3 hours just to get my View to scroll to a 
point when loaded. But not to start and cut off the rest of it, just be 
scrolled to there.

Tried it in my real project, didn't work, made small test project, doesn't work 
either.

NSScrollView* myscrollview = [[NSScrollView alloc] 
initWithFrame:NSMakeRect(0, 0, 200, 200)];
NSClipView* myclipview = [[NSClipView alloc] initWithFrame:NSMakeRect(0, 0, 
500, 400)];
[myscrollview setHasVerticalScroller:YES];
[myscrollview setHasHorizontalScroller:YES];
[myscrollview setDocumentView:myclipview];

[[myscrollview documentView] scrollPoint:NSMakePoint(300.0, 300.0)];

[self.window.contentView addSubview:myscrollview];


but this isn't scrolling anywhere. I'm shure I'm missing something. Thanks for 
reply!
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