CODEWITHSUNDEEP
objective-ccocoa
user187676
user187676

Reputation:

Proper way to determine if NSView is drawn

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

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.

Upvotes: 4

Views: 1547

Answers (2)

user187676
user187676

Reputation:

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];
}

Upvotes: 3

Joshua Nozzi
Joshua Nozzi

Reputation: 61228

Whether (or when) it's drawn is supposed to be "none of your business" and really have nothing to do with whether or not it's on-screen. Use NSView's -viewDidMoveToSuperview or -viewDidMoveToWindow to manage this.

Upvotes: 0

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