Constrain Window Proportions

[honkFactory]

I want to have a window that is resizeable but is constrained to certain proportions. When I subclass NSWindow, what methods should I override to do this properly?

[skyhawk]

these are the 3 functions I use (and I just use delegation)

- (NSSize)windowWillResize:(NSWindow *)sender toSize:(NSSize)proposedFrameSize
{
proposedFrameSize.height = proposedFrameSize.width * 3/4;
return [NSWindow frameRectForContentRect:(NSRect){[self frame].origin,proposedFrameSize} styleMask:[sender styleMask]].size;
}

- (NSRect)windowWillUseStandardFrame:(NSWindow *)sender defaultFrame:(NSRect)df
{
int n=df.size.height*4/3;
if (n < df.size.width)
{
df.origin.x += (df.size.width-n)/2;
df.size.width = n;
} else {
df.size.height = df.size.width*3/4;
}
return df;
}

- (void)newsize:(NSNotification *)nsn
{
NSOpenGLContext *c = [self openGLContext];
[c clearDrawable];
[c setView:self];
}

[Sohta]

Hum...


[ self setContentAspectRatio: NSMakeSize( 4 , 3 ) ];

?

[honkFactory]

In the initWithFrame: method of the openGL view subclass which is in the window whose aspect I wish to constrain I tried
{
NSSize windowSize;
windowSize.height=3;
windowSize.width=4;
[[self window] setResizeIncrements:windowSize];
}
But it doesn't work. Why not?

[imported_kelvin]

In the initWithFrame: method of the openGL view subclass which is in the window whose aspect I wish to constrain I tried
{
NSSize windowSize;
windowSize.height=3;
windowSize.width=4;
[[self window] setResizeIncrements:windowSize];
}
But it doesn't work. Why not? I believe you're not going to get good sizing because the title bar adds some height that changes the ratio.

[honkFactory]

Kelvin. Thats not the problem. The problem is that the size isn't constrained in any way at all. I tried both setResizeIncrements: and setAspectRatio: in both the initWithFrame: and awakeFromNib: methods and neither seem to have any effect on the window. Do I need to call these at a certain time for them to be effective?

[honkFactory]

Wait. setAspectRation does work in the awakeFromNib method. However setResizeIncrements: (which is the method I really want) does not.

[arekkusu]

Resize increments and aspect ratio are mutually exclusive attributes.

10.3 adds setContentAspectRatio: which is what most people really want. On 10.2 you have to subtract the widget size (currently just the menubar height), fix the aspect, and then add the widgets back. See Shoot Things source.