Overridden by subclasses to return
YES if the view should be sent a
mouse message for an initial mouse-down event,
NO if not.
- macOS 10.0+
The initial mouse-down event, which must be over the view in its window.
The view can either return a value unconditionally or use the location of
the to determine whether or not it wants the event. The default implementation ignores
the and returns
Override this method in a subclass to allow instances to respond to click-through. This allows the user to click on a view in an inactive window, activating the view with one click, instead of clicking first to make the window active and then clicking the view. Most view objects refuse a click-through attempt, so the event simply activates the window. Many control objects, however, such as instances of
NSSlider, do accept them, so the user can immediately manipulate the control without having to release the mouse button.