objview.h

来自「Yet another mp3 player, but this time us」· C头文件 代码 · 共 51 行

/* 
  objview.h  Abstract base class for deriving displayed objects.

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License as published by the
  Free Software Foundation; either version 2 of the License, or (at your
  option) any later version.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details, www.gnu.org.

  Copyright (C) 2000  Simon Harrison (email smh@[e-mail])
*/


#ifndef WINDOWVIEW_DOT_H
#define WINDOWVIEW_DOT_H

#include "svgawrap.h"


class CObjectView {
   protected:
   int PAGE_TOP;    // Y position
   int PAGE_LEFT;   // X Position
   bool hasfocus;   // Whether or not the object processes K/B input.
   vgaw* vga;       // Reference to the display
   CObjectView() {}
   public:
   int Update() {   // returns key input not handled by this view.
      int r=0;
      if (hasfocus) r = ProcessMessages();
      Paint();
      return r;
   }                   // update any tasks the view must support.
   SetFocus(bool b) { hasfocus = b; }
   bool GetFocus() { return hasfocus; }
   virtual ~CObjectView() {}
   protected:
   writexy( int x, int y, char* p ) { 
      vga->spaced_gl_write( x+PAGE_LEFT, y+PAGE_TOP, p ); 
   } 
   virtual int ProcessMessages() { return 0; }  // Check for keyboard input 
   virtual Paint() {}          // Update the display for this view.
};

#endif