Question

I have a button in a child window.

If I am working in the parent window (it is key), and I click once on the button in the child window, this click makes the child window key. I then have to click a second time to make the control (in this case, a button) respond.

How can I immediately respond to a click on that button in a non-key window?

Answer 1

This is controlled individually for each view class by -[NSView acceptsFirstMouse:] which returns NO by default. Subclasses have to return YES to allow the first click to work.

However, NSButton implementation already returns YES so it should work as is, unless your button is not painted by NSButton instance.