Re: Problem moving subview within superview
Re: Problem moving subview within superview
- Subject: Re: Problem moving subview within superview
- From: Ivan Kourtev <email@hidden>
- Date: Fri, 10 Feb 2006 12:32:18 -0500
I see what you mean, good comment (actually, after my previous
posting I tested more and moving the button works even without
removing it then adding it to the view hierarchy again). I still
don't understand why -displayIfNeeded doesn't work but -display does.
Thanks.
--
ivan
On Feb 10, 2006, at 12:15 PM, Stephane Sudre wrote:
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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