做为linux下图形用户界面支持系统之一的MicroWindows采用C++设计

				//
				// Micro Windows Implementation
				// control.h
				//
				// $Revision: 1.2 $
				// $Source: P:/MWINDOWS/LIB/rcs/control.cpp $
				// $Date: 1993/11/27 09:53:32 $
				//
				
				// Control class does nothing but handles mouse class by its own.
				
				#include "control.h"
				#include "message.h"
				#include "mouse.h"
				
				Control::Control (Rect *prect, View *pparent, Model *client,
				                  BOOL attach, BOOL killModel)
				        :View (prect, pparent, client, FALSE, killModel)
				{
				    if (attach && parent) parent->attachSubview (this);
				}
				
				void Control::messageDispatcher (Message *msg)
				{
				    View::messageDispatcher (msg);
				}
				
				void Control::draw (Rect *area)
				{
				    Model *cli = NULL;
				
				    if (clientModel)
				    {
				        cli = clientModel;
				        clientModel = NULL;
				    }
				
				    View::draw (area);
				
				    if (cli) clientModel = cli;
				}
				
				//
				// dispatch mouse messages to methods of itself.
				//
				void Control::selfMouse (Message *msg)
				{
				    switch (msg->type)
				    {
				        case MSG_MouseMove:
				            mouseMove (&(msg->pnt));
				            return;
				
				        case MSG_LeftButtonDown:
				            leftButtonDown (&(msg->pnt));
				            return;
				
				        case MSG_LeftButtonUp:
				            leftButtonUp (&(msg->pnt));
				            return;
				    }
				}
				
				void Control::selfDraw (Port *port, Rect *area)
				{
				    View::selfDraw (port, area);
				}
				
				void Control::mouseMove (Point *pnt)
				{
				}
				
				void Control::leftButtonDown (Point *pnt)
				{
				}
				
				void Control::leftButtonUp (Point *pnt)
				{
				}