The following code is my attempt to constrain a displayView and window
size such that the displayView maintains the proper aspect ratio when the
window is resized. I have two issues:
1. It sort of works. However, the displayView size tracking lags by at
least one time sample and I then have to gently nudge the window size to get
it right.
2. This is a variable size window that is intended to show a miniature
display of what is in the main window (elsewhere). I made an abortive
attempt to scale the coordinates of displayView. Apparently, I don't
understand the "scaleUnitSquareToSize" call and the docs don't help. Any
suggestions?
// Window delegate for size
- (NSSize)windowWillResize:(NSWindow*)sender
toSize:(NSSize)frameSize
{
// displayView/controlView are outlets to top/bottom views in the
window.
// displayView has variable height, controlView fixed height.
// First, get the size of main view (elsewhere).
NSSize fullSize = [[document
valueForKeyPath:@"course.props.presentaionSize"] sizeValue];
float frameWidth = frameSize.width;
// Maintain aspect ratio of display view.
float displayHeight = frameWidth * fullSize.height / fullSize.width;
[displayView setFrameSize:NSMakeSize(frameWidth, displayHeight)];
float controlViewHeight = [controlView frame].size.height;
float winHeight = displayHeight + controlViewHeight;
// Abortive attempt to scale display coordinates to fit.
// float scale = frameWidth / fullSize.width; // Tried reciprocal
also.
// [displayView scaleUnitSquareToSize:NSMakeSize(scale, scale)];
return NSMakeSize (frameSize.width, winHeight);
}
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