Devs,
I have a NSScrollview with and NSImageView as its document view. I have a
sublayer for the scrollview that serves my selection rect. When I load an image
I can pressed down and draw the selection rect, but as soon as I resize the
window, the rect disappears but the image remains. As the window resizes, the
code changes the location of the image in the window and should also be
updating the location of the selection rect such that the selection rect “stays
in place” with respect to the image as its location is updated due to the
window resize. Here is what I have in drawRect():
-(void)drawRect:(NSRect)dirtyRect {
if(([self inLiveResize] == YES) && (_userImage != nil)) {
// grab the previous image location
CGPoint prevImageLocation = _imageLocation;
// compute frame origin
CGRect documentViewFrame;
documentViewFrame.origin.x = 0.0;
documentViewFrame.origin.y = 0.0;
// if the content view is larger than the image
if([[self contentView] frame].size.width > [_userImage size].width) {
documentViewFrame.size.width = [[self contentView]
frame].size.width;
_imageLocation.x = ( documentViewFrame.size.width - [_userImage
size].width ) / 2.0;
}
else {
documentViewFrame.size.width = [_userImage size].width;
_imageLocation.x = 0.0;
}
if([[self contentView] frame].size.height > [_userImage size].height) {
documentViewFrame.size.height = [[self contentView]
frame].size.height;
_imageLocation.y = ( documentViewFrame.size.height - [_userImage
size].height ) / 2.0;
}
else {
documentViewFrame.size.height = [_userImage size].height;
_imageLocation.y = 0.0;
}
[[self documentView] setFrame:documentViewFrame];
// compute new location for selection layer
[CATransaction begin];
[CATransaction setDisableActions:YES];
_selectionFrame.origin.x += ( _imageLocation.x - prevImageLocation.x );
_selectionFrame.origin.y += ( _imageLocation.y - prevImageLocation.y );
[_selectionLayer setFrame:_selectionFrame];
[CATransaction commit];
}
}
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