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# QToolBarChangeEvent Class Reference
[com.trolltech.qt.gui module]

The `QToolBarChangeEvent` class provides an event that is sent whenever a the toolbar button is clicked on Mac OS X. More...

Inherits `QEvent`.

## Detailed Description

The `QToolBarChangeEvent` class provides an event that is sent whenever a the toolbar button is clicked on Mac OS X.

The `QToolBarChangeEvent` is sent when the toolbar button is clicked. On Mac OS X, this is the long oblong button on the right side of the window title bar. The default implementation is to toggle the appearance (hidden or shown) of the associated toolbars for the window.