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/*
 *
 * This file is part of Tulip (www.tulip-software.org)
 *
 * Authors: David Auber and the Tulip development Team
 * from LaBRI, University of Bordeaux 1 and Inria Bordeaux - Sud Ouest
 *
 * Tulip is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 *
 * Tulip 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.
 *
 */

#ifndef Tulip_GLMAINVIEW_H
#define Tulip_GLMAINVIEW_H

#include <tulip/ViewWidget.h>

class QGraphicsProxyWidget;
class QAction;
class QRectF;

namespace tlp {
class GlOverviewGraphicsItem;
class SceneConfigWidget;
class SceneLayersConfigWidget;
class GlMainWidget;
class QuickAccessBar;

/**
 * @ingroup Plugins
 *
 * @brief An abstract view that displays a GlMainWidget as its central widget.
 *
 * The GlMainView subclasses ViewWidget and always uses a GlMainWidget as the central widget of the panel. It also adds the following features:
 * @list
 * @li An overview of the scene that can be toggled on or off.
 * @li Some configuration widgets that modify the rendering parameters.
 * @li A quick access bar widget that allows the user to quickly modify some of the most used rendering parameters and graph properties (nodes color, edges display, etc)
 * @li The possibility to make snapshots of the current scene
 * @endlist
 *
 * Subclassing GlMainView means you will only want to display graphs in a single GlMainWidget. Switching the central widget can only be achieved from the ViewWidget class.
 *
 * @warning It is strongly unadvised to re-implement methods already implemented into tlp::View or tlp::ViewWidget. If you have to add custom behavior to those method, make sure to call the upper-class methods first:
 @code
 void MyView::setupWidget() { // Where MyView is a subclass of tlp::GlMainView
   GlMainView::setupWidget(); // call this first
   // insert custom behavior here
 }
 @endcode

 * @see tlp::ViewWidget
 */
class TLP_QT_SCOPE GlMainView: public tlp::ViewWidget {

  Q_OBJECT

  tlp::GlMainWidget* _glMainWidget;
  tlp::GlOverviewGraphicsItem* _overviewItem;
  bool isOverviewVisible;
  QGraphicsProxyWidget* _quickAccessBarItem;

  QAction *_centerViewAction;
  QAction *_forceRedrawAction;

protected :

  tlp::QuickAccessBar* _quickAccessBar;
  tlp::SceneConfigWidget* _sceneConfigurationWidget;
  tlp::SceneLayersConfigWidget* _sceneLayersConfigurationWidget;

public:

  enum OverviewPosition {OVERVIEW_TOP_LEFT, OVERVIEW_TOP_RIGHT, OVERVIEW_BOTTOM_LEFT, OVERVIEW_BOTTOM_RIGHT};

  GlMainView();
  virtual ~GlMainView();
  tlp::GlMainWidget* getGlMainWidget() const;
  virtual QList<QWidget*> configurationWidgets() const;
  bool overviewVisible() const;
  QPixmap snapshot(const QSize &outputSize=QSize()) const;
  void setOverviewPosition(const OverviewPosition &position);

public slots:
  /**
   * @brief Calls GlMainWidget::draw();
   */
  virtual void draw();

  /**
   * @brief Calls GlMainWidget::redraw();
   */
  void redraw();

  /**
   * @brief Calls GlMainWidget::redraw();
   */
  virtual void refresh();

  /**
   * @brief Force the overview to be redrawn. Since GlMainView already detects graph's modifications, this method should not be called manually to avoid extra rendering.
   */
  virtual void drawOverview(bool generatePixmap=true);

  /**
   * @brief Centers the scene's camera
   */
  virtual void centerView(bool graphChanged = false);

  /**
   * @brief Toggles the overview on or off
   */
  void setOverviewVisible(bool);

  /**
   * @brief Toggles the orthogonal projection on or off, then draws
   */
  void setViewOrtho(bool);

  /**
   * @brief Force the settings set in the configuration widgets to be re-applied.
   */
  void applySettings();

  /**
   * @brief Display a dialog that takes a snapshot of the current scene.
   */
  void openSnapshotDialog();

  void undoCallback();

protected slots:
  virtual void glMainViewDrawn(bool graphChanged);
  virtual void sceneRectChanged(const QRectF&);
  void setQuickAccessBarVisible(bool);
  void fillContextMenu(QMenu *menu,const QPointF &);

protected:
  virtual void setupWidget();
  bool quickAccessBarVisible() const;
  void assignNewGlMainWidget(GlMainWidget *glMainWidget,bool deleteOldGlMainWidget=true);
  bool eventFilter(QObject* obj, QEvent* event);

  tlp::GlOverviewGraphicsItem* overviewItem() const;

  OverviewPosition _overviewPosition;
};
}

#endif /* GLMAINVIEW_H_ */