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image_viewer.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef PSP_IMAGE_VIEWER_H
#define PSP_IMAGE_VIEWER_H

class InputHandler;

00031 class ImageViewer : public DisplayClient {
public:
      enum Event {
            EVENT_NONE = -1,
            EVENT_HIDE = 0,
            EVENT_SHOW = 1,
            EVENT_ZOOM_IN,
            EVENT_ZOOM_OUT,
            EVENT_MOVE_LEFT,
            EVENT_MOVE_UP,
            EVENT_MOVE_RIGHT,
            EVENT_MOVE_DOWN,
            EVENT_MOVE_STOP,
            EVENT_NEXT_IMAGE,
            EVENT_LAST_IMAGE,
      };

private:
      Buffer *_buffer;
      Palette *_palette;
      GuRenderer *_renderer;
      bool _visible;
      bool _dirty;
      bool _init;
      uint32 _imageNum; // current image number
      float _zoomFactor;      // how much we're zooming in/out on the image
      float _visibleHeight, _visibleWidth;
      float _centerX, _centerY;
      Event _movement;
      
      InputHandler *_inputHandler;
      DisplayManager *_displayManager;
      
      void setFullScreenImageParams();
      void loadNextImage();
      void loadLastImage();
      void setViewerButtons(bool active);
      void setConstantRendererOptions();
      void moveImageX(float val);
      void moveImageY(float val);
      bool load(int imageNum);
      void unload();    
      void runLoop(); // to get total pausing we have to do our own loop
      
      void setZoom(float value);
      void setOffsetParams();
      void modifyZoom(bool up);     // up or down
      void setVisible(bool visible);
      
public:

      ImageViewer() : _buffer(0), _palette(0), _visible(false), 
                              _dirty(false), _init(false), _imageNum(0), 
                              _zoomFactor(0.0f), _visibleHeight(0.0f), _visibleWidth(0.0f), 
                              _centerX(0.0f), _centerY(0.0f), _movement(EVENT_MOVE_STOP),
                              _inputHandler(0), _displayManager(0) {}
      ~ImageViewer() { unload(); }  // deallocate images
      bool load();
      void render();
      bool isVisible() { return _visible; }
      bool isDirty() { return _dirty; }
      void setDirty() { _dirty = true; }
      void setClean() { if (!_visible) // otherwise we want to keep rendering
                                          _dirty = false; 
      }     
      void resetOnEngineDone();
      
      void handleEvent(uint32 event);
      
      // pointer setters
      void setInputHandler(InputHandler *inputHandler) { _inputHandler = inputHandler; }  
      void setDisplayManager(DisplayManager *displayManager) { _displayManager = displayManager; }
};

#endif /* PSP_IMAGE_VIEWER_H */ 

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