Re: Scrollers on custom view appearing but not disappearing
Re: Scrollers on custom view appearing but not disappearing
- Subject: Re: Scrollers on custom view appearing but not disappearing
- From: Steve Weller <email@hidden>
- Date: Fri, 29 Feb 2008 18:10:01 -0800
On Feb 29, 2008, at 4:46 PM, Quincey Morris wrote:
On Feb 29, 2008, at 16:00, Steve Weller wrote:
- (void) setFrameSize:(NSSize)newSize
{
NSSize cSize;
cSize = [self canvasSize]; // Provides a size
// Use the larger dimensions of the two rects
if(newSize.width > cSize.width)
cSize.width = newSize.width;
if(newSize.height > cSize.height)
cSize.height = newSize.height;
[super setFrameSize:cSize];
}
And this works as long as the window is only made smaller. If the
window is made larger then the scrollers do not disappear.
Is my approach the right one for what I am trying to achieve?
Probably not. There are various ways the view frame can change, and
they don't all funnel through the setFrameSize method.
If you register to receive NSViewFrameDidChangeNotification's for
your view (remembering to call setPostsFrameChangedNotifications:
YES), it might work to do something like this in the notification
method:
[[NSNotificationCenter defaultCenter] removeObserver: self];
NSRect frame = [self frame];
// calculate new frame
[self setFrame: frame];
[[NSNotificationCenter defaultCenter] addObserver: self ...
I implemented this with no change no behavior.
The higher level problem I am trying to solve is this:
My custom view spans the window's content view. I want to draw a white
rectangle (think of a document) centered in that area and fill the
remainder gray. In my drawRect method I first draw gray into the
rectangle passed. Then I calculate where the white rectangle should be
and draw it.
I need the scrollers to act on the bounds of the white rectangle so
that they are present when any part of it is not visible.
Should I be putting my custom view inside another view and doing the
centering and background color with IB instead?
What is the best way of implementing this?
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