CODEWITHSUNDEEP
macoscocoanscontrol
gcamp
gcamp

Reputation: 14662

Drawing NSControl when the windows is key or not

I have a NSControl subview and I want to change the drawing when the control is not on a keyWindow. The problem is that I don't see any property that reflects that state (tried enabled property but that was not it).

In simple terms, can I differentiate between these two states?

disabledenabled

Upvotes: 3

Views: 661

Answers (1)

Marc Charbonneau
Marc Charbonneau

Reputation: 40517

You can use NSWindow's keyWindow property, and if you want to check to see if your control is the first responder for keyboard events also test [[self window] firstResponder] == self. I don't believe keyWindow supports KVO, but there is a NSWindowDidBecomeKeyNotification and NSWindowDidResignKeyNotification you can listen for. For instance,

- (id)initWithFrame:(NSRect)frameRect;
{
    if ( self = [super initWithFrame:frameRect] )
    {
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(display) name:NSWindowDidResignKeyNotification object:nil];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(display) name:NSWindowDidBecomeKeyNotification object:nil];
    }

    return self;
}

- (void)drawRect:(NSRect)aRect;
{
    if ( [[self window] isKeyWindow] )
    {
    // one way...
    }
    else
    {
    // another way!
    }
}

- (void)dealloc;
{
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowDidResignKeyNotification object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowDidBecomeKeyNotification object:nil];
    [super dealloc];
}

Upvotes: 6

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