Simplifies the handling of drag events. More...

#include <vgui_drag_mixin.h>

Inheritance diagram for vgui_drag_mixin:

Public Member Functions
	vgui_drag_mixin (void)
	Constructor - create a default vgui_drag_mixin.
virtual	~vgui_drag_mixin (void)
	Destructor.
virtual bool	handle (vgui_event const &)
	Look for drag events and pass them to mouse_drag().
virtual bool	mouse_drag (int, int, vgui_button, vgui_modifier)
	Called when the user is dragging the mouse.
Private Attributes
vgui_button	last_down_button_
	Mouse button the user is pressing (vgui_BUTTON_NULL if none is pressed).

Detailed Description

Simplifies the handling of drag events.

A drag event occurs when the user moves the mouse with one of the mouse buttons pressed down. In VGUI there is no vgui_DRAG event (there is only vgui_MOTION for when the mouse is moving). So if you want to capture drag events you may find this class handy.

The drag_mixin records the last mouse button to be pressed and will send vgui_MOTION events to the function mouse_drag() if the mouse is being moved with a button depressed.

An easy way to use vgui_drag_mixin is to derive your tableau from vgui_drag_tableau. You would then be able to implement mouse_drag and all the other function like key_press, mouse_down in vgui_tableau to handle events.

Definition at line 37 of file vgui_drag_mixin.h.