color-under-mouse

Arguments: split-bar

Returns the color-under-mouse property of a split-bar widget. The value may be set at creation time by passing the :color-under-mouse initarg to make-instance, or any time later by call (setf color-under-mouse).

This is the color of the split-bar widget when it is under the mouse cursor but it is not being dragged.

The value may be either an RGB color object (see make-rgb), or a constant symbol or global variable whose value is an RGB, or nil to use the system-edge-shadow-color, or else t to match the parent window's background color, making the split-bar invisible. The value may be set at creation time by passing the :color-under-mouse initarg to make-instance, or any time later by call (setf color-under-mouse).

The default value is t to avoid distracting the user with a split-bar that flashes whenever the mouses happens to move over it. The changing mouse cursor indicates that a drag can be done there, even when the split-bar itself cannot be seen.

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Created 2019.8.20.