A Boolean value indicating whether drawing commands will produce any results.
- macOS 10.0–10.14Deprecated
The value of this property is
YES when drawing produces expected results. A view object can draw onscreen if it is not hidden, it is attached to a view hierarchy in a window (
NSWindow), and the window has a corresponding window device. A view object can also draw during printing if it is a descendant of the view being printed.
Check the value of this property before attempting to force drawing to a specific context. For example, if the value of this property is
NO, do not call
lock or do issue any drawing commands from the view. You do not need to check whether drawing can occur when calling the
display method or any of its related methods. The display methods perform appropriate checks before asking the view to draw itself.