I have a custom NSView in which the bounds are changed to shrink or enlarge an
image whenever a magnification event is taking place. Printing out to the
console shows the bounds origin is changing, but I am not seeing this effect in
the application’s window. I override -(void)magnifyWithEvent to make this
happen:
-(void)magnifyWithEvent:(NSEvent *)event {
CGFloat zoomFactor = [event magnification] + 1.0;
CGSize newSize = [self bounds].size;
newSize.width = newSize.width * zoomFactor;
newSize.height = newSize.height * zoomFactor;
[self setBoundsSize:newSize];
CGSize viewFrameSize = [self frame].size;
CGPoint newOrigin;
newOrigin.x = (viewFrameSize.width - newSize.width) / 2.0;
newOrigin.y = (viewFrameSize.height - newSize.height) / 2.0;
[self setBoundsOrigin:newOrigin];
[self setNeedsDisplay:YES];
}
Effectively, this should center the bounds in the view’s frame and the image
should appear centered, but instead I see the image being anchored to the lower
left corner of the view’s frame. Am I misunderstand how this should work? Do I
need to investigate a different solution?
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