Question

Is there a proper way to determine if a NSView is actually drawn in the current view hierarchy or not, considering cases like:

• The view is completely offscreen (not mandatory)
• The view is not on top of the view hierarchy

The -isHidden and -isHiddenOrHasHiddenAncestor are unfortunately not set when e.g. a view disappears because a tab view switches to another tab.

The reason for this is that I have an attached child window and I would like to be able to hide it as well when the view that it is attached to is not drawn.

Answer 1

I have found a trick to tell if it is visible, but it requires subclassing. It works by toggling an ivar on 2 events.

- (void)discardCursorRects {
  isDrawn_ = NO;
  [super discardCursorRects];
}

- (void)resetCursorRects {
  isDrawn_ = YES;
  [super resetCursorRects];
}