wait-for-drag

Arguments: nil

This function may be used to determine whether the user is trying to initiate a drag, rather than performing a simple click. An application may want to initiate a drag-and-drop in a mouse-left-down method only if this function returns true, for example.

wait-for-drag waits until either the left mouse button is up or until the mouse moves at least *start-drag-slack* pixels from where it was when wait-for-drag was called, and then returns. If the left mouse button was pressed when wait-for-drag was called and continues to be pressed until the mouse moves at least *start-drag-slack* pixels, then true is returned; otherwise nil is returned.

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This page was not revised from the 9.0 page.
Created 2015.5.21.