Resize Cocoa windows proportionally

Question

I was wondering how I could constrain an application window to be resized only proportionally? I want it to keep the ratio so as not to distort photos/videos.

Belonging

Answer 1

You would probably do this in your application delegate; in a standard project template, that object has a reference to your app's main window.

- (void)awakeFromNib {
    // Keep the aspect ratio constant at its current value
    [window setAspectRatio:window.frame.size];
}

Joyance

Note to self: This answer is 100% right. Depending on how you get your reference to window, make sure it's not nil – Ruebenrueda

Answer 2

You don't resize applications, you resize windows. You can use -[NSWindow setContentAspectRatio:].

Carnival

Thanks for the rectification. Where do I declare this paramater? – Belonging

Whenever you know what the aspect ratio will be, maybe in the window controller or document controller, depending on how your application is organized. – Carnival

I am very new to xcode and objective-c, excuse my ignorance :) I created the window on the .xib file via the visual editor, so i dont know where to put that code. – Belonging

Well, typically when you have a document window in a .xib file you'll have a "file's owner" object which is often a window controller. Before you can set the window's aspect ratio you need to know what the aspect ratio of your content is. Sounds like you might want to get a good introductory Cocoa book and do some reading before you write any more code though... – Carnival

I ordered one, still waiting for it, but i thought i might try anyways before. So now i have a window controller file, which is a subclass of NSWindow. The aspect ratio of my content is 4/3. – Belonging