Re: NSView vs CALayer

On Sep 29, 2009, at 19:25, parfeon wrote:

>
>
>
> Christiaan Hofman-2 wrote:
>>
>>
>> On Sep 29, 2009, at 18:46, parfeon wrote:
>>
>>>
>>>
>>>
>>> Christiaan Hofman-2 wrote:
>>>>
>>>>
>>>> On Sep 29, 2009, at 18:03, parfeon wrote:
>>>>
>>>>>
>>>>>
>>>>> 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
>>>>>>
>>>>>> _______________________________________________
>>>>>> MacOSX-dev mailing list
>>>>>> [email protected]
>>>>>> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>>>>>>
>>>>>>
>>>>> 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?
>>>>
>>>> You still did not say what your problem is. What do you get? What  
>>>> do
>>>> you expect? What do you want to get? What do you think is wrong?
>>>> There's a lot of things going on, and I don't know which part is
>>>> relevant. And your Engrish also does not help.
>>>>
>>>> Perhaps you should try to reduce your problem to a much simpler
>>>> model.
>>>>
>>>> Is the transparent overlay that partially covers the window the
>>>> CADragnDropView? In that case your setup makes no sense, because  
>>>> the
>>>> splitview and dragndropview  are overlapping sibling views, which  
>>>> is
>>>> not supported and generally results in a mess.
>>>>
>>>> Christiaan
>>>>
>>>> _______________________________________________
>>>> MacOSX-dev mailing list
>>>> [email protected]
>>>> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>>>>
>>>>
>>>
>>>
>>> Yes, problem lies in that, what I can't make DragNDrop to be
>>> transparent for
>>> view with content (I show that on screenshot). Ok, I got it, but why
>>> DragNDrop view is transparent when showing different views (with
>>> content
>>> which not drown with CA). I'm just little bit confused about this,
>>> at one
>>> hand it's work with other views, at another it doesn't want work
>>> correct
>>> with another custom view. Thats why i thought what there something
>>> wrong in
>>> methods which I use to draw or place this view.
>>
>> You should not be confused: it's wrong, the result is undefined, so  
>> it
>> just does not work. It is irrelevant in which way it goes wrong.
>>
>> Christiaan
>
> I see. Thats not good. I need somehow to reproduce such effect like  
> in drag
> .torrent file over Transmission (appears transparent background  
> which cover
> whole interface). Is there any well known practice for creating such
> overlay? I was trying to find something like that, but no w/o no luck.
>

The standard practice is to overlay a transparent borderless child  
window.

> Ah, there is another reason of creating this cover layer. As I can  
> found in
> documentations, registration for   dragNdrop files from outside of
> application to inside available only for NSView.
>
> Application delegate class can handle dragNdrop on dock icon, as for
> application window itself... I found useful methods inside NSView  
> class.
>


Views and windows can implement the NSDraggingDestination protocol.

Christiaan