ImageGear for C and C++ on Linux v20.0 - Updated
API Reference Guide > ART Component API Reference > ART Component Callback Functions Reference > LPFNIG_ART_MOUSENOTIFYFUNC

This callback, used during run-mode, is called when the end user interacts with marks using the mouse, including clicking on a mark or passing over one.


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        HIGEAR hIGear, 
        LPVOID lpPrivate, 
        ART_MARK_INDEX hMarkIndex, 
        AT_MODE nReason, 
        const LPAT_POINT lpPoint


Name Type Description
hIGear HIGEAR HIGEAR handle to the image.
lpPrivate LPVOID A far pointer to the private callback data.
hMarkIndex ART_MARK_INDEX The index number (identifier) for the new mark.
nReason AT_MODE An ART-defined constant of type AT_MODE that determines why this callback has been called. See below.
lpPoint const LPAT_POINT A far pointer structure of type AT_POINT that gives the screen coordinates of the position of the mouse at the time of the callback.

Return Value:

This callback function does not return a value.

Supported Raster Image Formats:

All pixel formats supported by ImageGear for C and C++.


Here are the settings for nReason:

ART_MOUSE_LBUTTON_DOWN Left button held down.
ART_MOUSE_LBUTTON_DBL_CLICK Left button double-clicked.
ART_MOUSE_LBUTTON_UP Left button up.
ART_MOUSE_RBUTTON_DOWN Right button down.
ART_MOUSE_RBUTTON_DBL_CLICK Right button double-clicked.
ART_MOUSE_RBUTTON_UP Right button up.
ART_MOUSE_ENTER The mouse cursor is entering a mark (i.e., the mouse moves over any visible portion of a mark).
ART_MOUSE_LEAVE The mouse cursor is leaving a mark (i.e., the mouse was over a mark, then it moved, and is off the mark).

This callback is called for each reason. You can put a switch statement into the callback function to respond or ignore each reason.


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

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