Re: Problem moving subview within superview
Re: Problem moving subview within superview
- Subject: Re: Problem moving subview within superview
- From: Stephane Sudre <email@hidden>
- Date: Fri, 10 Feb 2006 18:15:55 +0100
On 10 févr. 06, at 18:01, Ivan Kourtev wrote:
Hello,
I have a simple app with window and a button in it. I want to
programmatically change the appearance of the button and its position
within the window. I used exactly the following code:
[button setButtonType:NSMomentaryPushInButton];
[button setBezelStyle:NSRecessedBezelStyle];
[button setImage:bImage];
[button setFrame:NSMakeRect(0,0,35,35)];
NSView *contentView = [window contentView];
[button retain];
[button removeFromSuperview];
[contentView addSubview:button];
[button release];
[button setNeedsDisplay:YES];
[window displayIfNeeded];
but there is a problem with "erasing" the button from its old position
within the window. The button shows up at its new location with its
new attributes exactly as I want but old button picture remains in the
window. The only way to make it go away was to hide window/app and
unhide.
Also, I was able to make it work programmatically by changing the last
line to [window display].
Why is this happening? Shouldn't -displayIfNeeded have worked? In
the docs, Apple actually advises against using -display and sticking
with -displayIfNeeded.
Also, is that the right way to do what I was trying to? I couldn't
think of anything more elegant but I'd love to hear if there is a
better approach.
I would do it that way:
NSView * buttonSuperView = [button superview];
// We probably don't want the frame to change before we remove it from
the view hierarchy
[button retain];
[button removeFromSuperview];
[button setButtonType:NSMomentaryPushInButton];
[button setBezelStyle:NSRecessedBezelStyle];
[button setImage:bImage];
[button setFrame:NSMakeRect(0,0,35,35)];
[buttonSuperView addSubview:button]; // Maybe you should set the frame
origin
[button release];
since it's working OK on my machine.
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