ImageGear for C and C++ on Windows v20.0 - Updated
LPFNART_GUI_TOOLBARNOTIFYFUNC
API Reference Guide > ARTGUI Component API Reference > ARTGUI Component Callback Functions Reference > LPFNART_GUI_TOOLBARNOTIFYFUNC

This callback, if registered, gets called when a user presses a button on the toolbar, or when the toolbar is closed via the close menu or 'x' on the mini-menu bar.

Declaration:

 
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typedef BOOL (FAR PASCAL* LPFNART_GUI_TOOLBARNOTIFYFUNC)(
        LPVOID lpPrivate, 
        DWORD dwButtonID, 
        UINT nReason
);

Arguments:

Name Type Description
lpPrivate LPVOID A far pointer to private data being passed to the callback.
dwButtonID DWORD The ID for the button that was pressed. These are defined in ARTGUI.H and begin with ART_BUTTON_.
nReason UINT The reason that the callback is being called. These are defined in ARTGUI.H and include: ART_GUI_TOOLBAR_BUTTON_SELECTED, ART_GUI_TOOLBAR_NONE_SELECTED, ART_GUI_TOOLBAR_HIDDEN, ART_GUI_TOOLBAR_DESTROYED,

Return Value:

The return value is ignored at this time.

Supported Raster Image Formats:

This function does not process image pixels.

Sample:

None

Remarks:

In order to use this callback, it must be registered with ART using the ART_callback_register() function.

This callback passes dwButtonID and nReason to let you know what triggered the callback. dwButtonID is the button that was pressed. Each button has a unique ID:

ART_GUI_TOOLBAR_BUTTON_SELECTED The button dwButtonID was pressed.
ART_GUI_TOOLBAR_NONE_SELECTED The user presses a button; no other buttons are pressed.
ART_GUI_TOOLBAR_HIDDEN The user pressed 'x' or closed the toolbar.
ART_GUI_TOOLBAR_DESTROYED The developer called the Windows API function DestroyWindow() and passed the handle of the toolbar window.

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