Re: NSView vs CALayer

Christiaan Hofman-2 wrote:
> 
> 
> On Sep 29, 2009, at 12:32, parfeon wrote:
> 
>>
>> Hello everyone.
>>
>> Working on project which draws some parts of its UI with CoreAnimation
>> CALayers. Currently i need create some cover view, which will appear  
>> over
>> whole UI (that NSView always there, coz it will response on user  
>> drag n
>> drop).
>> I'm stumbled with such problem as shown on screen
>>
>> http://www.nabble.com/file/p25659257/nsviewvscalayer.png
>>
>> http://img44.imageshack.us/i/nsviewvscalayer.png/
>>
>> Transparent view overlays the view in which I used CALayers for  
>> drawing.
>> Dunno why, but when I change that subview (with CALayers) to any  
>> other (w/o
>> CoreAnimation drawing... some standard IB elements) everything looks  
>> great.
>>
>>
>> Can someone help me with this?
>>
>> Thanks
> 
> I really can't understand your message and in particular what your  
> specific problem is. But the basic fact is that layer-hosting views  
> cannot have subviews, so I guess that's where you run into.
> 
> Christiaan
> 
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Quoted from: 
http://www.nabble.com/NSView-vs-CALayer-tp25659257p25663495.html


My bad. Will try to explain all what I have done. Currently I want try to
make behavior of window like in Transmission when You drag over .torrent
file (appears blacj cover with info on center)

1. I have XIB with such structure as shown on image:
http://img21.imageshack.us/img21/2967/mainxibstructure.png . I've placed
there split view (2 views inside). Left view used for displaying source list
(as we can see here
http://www.nabble.com/file/p25659257/nsviewvscalayer.png) and the right view
i used for displaying information (Place Holder). And also there over that
split view "Drag&Drop Layer" (custom NSView where with CA I'm drawing
transparent background);
2. After application do launch, my code placing inside "Place Holder" (with
addSubview:) new custom view (instance of NSView placed in other XIB file);
3. On awakeFromNib that custom view creates CALayers and draws there content
(background and buttons). On 'self' of custom view I'm setting setLayer to
"baseLayer" (which holds all graphics) and then call setWantsLayer:YES;
4. And at the end we can see picture as I shown:
http://www.nabble.com/file/p25659257/nsviewvscalayer.png It look's like
"Drag&Drop Layer" cut out piece of custom view inside "Place Holder". 

Here is the code which I use to insert custom view inside "Place Holder":

- (void)changeViewTo:(id)view{
	if(currentView != [view view])
		currentView = nil;
	
	if([[placeHolderView subviews] count] == 0){
		[placeHolderView addSubview:[view view]];
	else
		[placeHolderView replaceSubview:[[placeHolderView subviews]
objectAtIndex:0] with:[view view]];
	
	currentView = [view view];
	
	[currentView setFrame:[[currentView superview] frame]];
	
	[currentView setFrameOrigin:NSMakePoint(0,0)];
	[currentView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
}

currentView - is type of NSView
placeHolderView - is IBOutlet on "Place Holder" view of NSView class

But when I'm adding inside placeHolder other custom view (which is inside
loaded XIB) we can see this picture
http://img182.imageshack.us/img182/1951/nsviewvsnsview.png In that view
placed standard elements, which not drawn in real time.

Sp till now I can't understand what I'm doing wrong. Can someone help with
this?
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