toggle-button

Arguments: button-widget

Sets the value of a boolean widget to t if its current value is nil, and otherwise sets its value to nil. The boolean widgets (ones that have only two logically distinct values) include button, default-button, cancel-button, picture-button, check-box, and radio-button.

This function emulates clicking on a boolean widget, and is handy for triggering the on-change function of a simple button widget. (Note that while a simple button widget has only a single visible state, it still holds a boolean value that causes the on-change function to run when it is changed.)

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