XPUDragWidget

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WIDGET_API int        XPUDragWidget(
                         XPWidgetMessage      inMessage,
                         XPWidgetID           inWidget,
                         intptr_t             inParam1,
                         intptr_t             inParam2,
                         int                  inLeft,
                         int                  inTop,
                         int                  inRight,
                         int                  inBottom);

XPUDragWidget drags the widget in response to mouse clicks. Pass in not only the event, but the global coordinates of the drag region, which might be a sub-region of your widget (for example, a title bar).