Re: Problem moving subview within superview

• Subject: Re: Problem moving subview within superview
• From: Camillo Lugaresi <email@hidden>
• Date: Fri, 10 Feb 2006 19:50:31 +0100
• Delivered-to: email@hidden
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On 10/feb/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.

NSRect oldFrame = [button frame];
[button setFrame:NSMakeRect(0,0,35,35)];
[[button superview] setNeedsDisplayInRect:oldFrame];
[button setNeedsDisplay];

Camillo
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