CODEWITHSUNDEEP
objective-cxcodemacoscocoanswindow
IluTov
IluTov

Reputation: 6862

Centred resizing with NSWindow

I have a NSWindow which is placed at the position of a NSStatusItem. The window can change it's size using it's own method setSize:, which just get's the right frame for the window like this:

- (NSRect)frameForSize:(NSSize)size {
    NSRect newFrame = self.frame;
    newFrame.origin.x += (newFrame.size.width - size.width) / 2;
    newFrame.origin.y += (newFrame.size.height - size.height);
    newFrame.size = size;

    return newFrame;
}

This allows the window to stay centred, if the width is changed. I can easily call this using code, but when I the user resizes it using the edges of the window, setFrame:display: is called directly. There is a delegate method windowDidResize:notification:, but if I set the frame there it get's set twice and it lags.

Is there an event that is being called before the window is actually resized? If not, how should I do this?

Upvotes: 0

Views: 1370

Answers (1)

Nate Chandler
Nate Chandler

Reputation: 4553

According to your above comment, you've subclassed NSWindow. Assuming that your method -frameForSize: is on your NSWindow subclass, override -[NSWindow setFrame:display:] as follows:

- (void)setFrame:(NSRect)frameRect display:(BOOL)flag
{
    frameRect = (self.inLiveResize) ? [self frameForSize:frameRect.size] : frameRect;
    [super setFrame:frameRect display:flag];
}

I've tested this. The window will resize smoothly and stay centered the entire time.

Upvotes: 2

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