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/*===========================================================================*\
 *                                                                           *
 *                              OpenFlipper                                  *
 *      Copyright (C) 2001-2009 by Computer Graphics Group, RWTH Aachen      *
 *                           www.openflipper.org                             *
 *                                                                           *
 *---------------------------------------------------------------------------*
 *  This file is part of OpenFlipper.                                        *
 *                                                                           *
 *  OpenFlipper 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 with the              *
 *  following exceptions:                                                    *
 *                                                                           *
 *  If other files instantiate templates or use macros                       *
 *  or inline functions from this file, or you compile this file and         *
 *  link it with other files to produce an executable, this file does        *
 *  not by itself cause the resulting executable to be covered by the        *
 *  GNU Lesser General Public License. This exception does not however       *
 *  invalidate any other reasons why the executable file might be            *
 *  covered by the GNU Lesser General Public License.                        *
 *                                                                           *
 *  OpenFlipper 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 Lesser General Public License for more details.                      *
 *                                                                           *
 *  You should have received a copy of the GNU LesserGeneral Public          *
 *  License along with OpenFlipper. If not,                                  *
 *  see <http://www.gnu.org/licenses/>.                                      *
 *                                                                           *
\*===========================================================================*/
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/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                         *
 *   $Author$                                                      *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/
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//=============================================================================
//
//  CLASS CoreWidget
//
//=============================================================================

/**
 * \file CoreWidget.hh
 * This File contains the header of the frameworks main widget
*/

#ifndef COREWIDGET_HH
#define COREWIDGET_HH


//== INCLUDES =================================================================

#include "OpenFlipper/common/Types.hh"
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#include <OpenFlipper/common/GlobalOptions.hh>
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#include <OpenFlipper/BasePlugin/ContextMenuInterface.hh>
#include <OpenFlipper/BasePlugin/LoggingInterface.hh>
#include <OpenFlipper/BasePlugin/MenuInterface.hh>
#include <OpenFlipper/BasePlugin/ViewInterface.hh>
#include <OpenFlipper/BasePlugin/StatusbarInterface.hh>

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#include <OpenFlipper/widgets/coreWidget/SideArea.hh>
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#include <OpenFlipper/widgets/coreWidget/ColorStatusBar.hh>
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#include <OpenFlipper/widgets/glWidget/QtBaseViewer.hh>
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#include <OpenFlipper/widgets/glWidget/QtGLGraphicsScene.hh>
#include <OpenFlipper/widgets/glWidget/QtGLGraphicsView.hh>
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#include <OpenFlipper/widgets/glWidget/QtMultiViewLayout.hh>
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#include <OpenFlipper/widgets/glWidget/QtSlideWindow.hh>
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#include <OpenFlipper/widgets/glWidget/QtPickToolbar.hh>
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// QT INCLUDES
#include <QMainWindow>
#include <QStackedWidget>
#include <QTextEdit>
#include <QToolBar>
#include <QStatusBar>

#include <QDockWidget>

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#include <OpenFlipper/widgets/aboutWidget/aboutWidget.hh>
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#include <OpenFlipper/widgets/loggerWidget/loggerWidget.hh>
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#include <OpenFlipper/widgets/optionsWidget/optionsWidget.hh>
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#include <OpenFlipper/widgets/helpWidget/helpWidget.hh>
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#include <OpenFlipper/widgets/stereoSettingsWidget/stereoSettingsWidget.hh>
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#include <OpenFlipper/Core/PluginInfo.hh>
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#include <ACG/QtWidgets/QtSceneGraphWidget.hh>

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#include <ACG/Scenegraph/DrawModes.hh>

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#include <OpenFlipper/INIFile/INIFile.hh>
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#include <OpenFlipper/BasePlugin/PluginFunctions.hh>
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/** \brief ViewMode struct
* This struct contains a ViewMode and its status information such as used widgets,toolbars or context menus
*
*/
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struct ViewMode{
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  /// Name of the View Mode
  QString name;
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  /// Icon of the View Mode
  /// TODO Specify size for Icons
  QString icon;
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  /// Is this a user defined custom view mode or a plugin generated one
  bool custom;
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  /// List of Visible Toolboxes in this view mode
  QStringList visibleToolboxes;
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  /// List of Toolbars in this view mode
  QStringList visibleToolbars;
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  /// List of context Menus in this view mode
  QStringList visibleContextMenus;
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};

class StackWidgetInfo {
  public:
    StackWidgetInfo(bool _editable,QString _name,QWidget* _widget);

    bool editable;
    QString name;
    QWidget* widget;
};

/** Info struct containing information about custom context menus
 */
struct MenuInfo {
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  /// The context item
  QAction*          action;
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  /// Type of objects for which the context Menu should be visible
  DataType        contextType;

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  /// Type of the context Menu ( Context for what type .. Background,Object,Node)
  ContextMenuType type;
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};

/** Core Widget of the Application
 */
class CoreWidget : public QMainWindow
{
  Q_OBJECT

public:

  /// constructor
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  CoreWidget( QVector<ViewMode*>& _viewModes, std::vector<PluginInfo>& _plugins, QList< SlotInfo >& _coreSlots );
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  /// destructor
  ~CoreWidget();

  signals:
    void clearAll();
    void loadMenu();
    void addEmptyObjectMenu();
    void saveMenu();
    void saveToMenu();
    void loadIniMenu();
    void saveIniMenu();
    void recentOpen(QAction*);
    void exit();

    void loadPlugin();
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    void showPlugins();
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  private slots:

    /// Called on applications close
    void closeEvent ( QCloseEvent * event );

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   //===========================================================================
  /** @name Logger
  * @{ */
  //===========================================================================

  signals :
      void log(Logtype _type, QString _message);
      void log(QString _message);

   /** @} */

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   //===========================================================================
  /** @name Keys
  * @{ */
  //===========================================================================

  protected :

    //! Handle key events
    virtual void keyPressEvent (QKeyEvent* _e);
    virtual void keyReleaseEvent(QKeyEvent* _e);

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    // Filter alt key events under windows
    //bool eventFilter(QObject *obj, QEvent *ev);

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  signals :

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    /** When this Signal is emitted when a Keyevent Event occures
     *  The signal is connected to all Plugins implementing KeyInterface by the pluginLoader
     */
    void PluginKeyEvent(QKeyEvent* );

    /** When this Signal is emitted when a Keyevent Release occures
     *  The signal is connected to all Plugins implementing KeyInterface by the pluginLoader
     */
    void PluginKeyReleaseEvent(QKeyEvent* );

    /// internal signal to register CoreWidget keys
    void registerKey(int _key, Qt::KeyboardModifiers _modifiers, QString _description,
                     bool _multiUse = false);
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    ///call a scripting function
    void call( QString _expression , bool& _success  );
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  private:
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    ///typedefs
    typedef std::multimap<  std::pair< int, Qt::KeyboardModifiers >  ,  std::pair< QObject*, int > > KeyMap;
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    typedef std::multimap< std::pair< QObject*, int >, std::pair< int, Qt::KeyboardModifiers > > InverseKeyMap;

    typedef std::pair< KeyMap::iterator, KeyMap::iterator > KeyRange;

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    /** \brief Register all events related to the core
     */
    void registerCoreKeys();

    /** \brief handle key events for the core
     *
     * This function is called to handle key events which are registered to the core
     */
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    void coreKeyPressEvent();

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    /// Handle core key events
    void coreKeyPressEvent  (QKeyEvent* _e);
    void coreKeyReleaseEvent(QKeyEvent* _e);

    KeyBinding getKeyBinding(QObject* _plugin, int _keyIndex );
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    QString    getRPCName(QObject* _plugin );
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    ///vector of keys registered to the core
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    std::vector<KeyBinding> coreKeys_;

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    ///mapping of all keys to registered keys and the corresponding plugins
    KeyMap keys_;

    ///mapping of all registered keys and the corresponding plugins to currently assigned keys
    InverseKeyMap invKeys_;

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    ///list of scripting slots from core
    QList< SlotInfo >& coreSlots_;

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  private slots:
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     /** \brief key registration
     *
     * internal slot that registers a keyCombination to the sender() who emitted the registerKey() signal
     * only after registering keyCombinations plugins receive keyEvents to the corresponding keyCombinations via KeyInterface.
     */
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    void slotRegisterKey(int _key, Qt::KeyboardModifiers _modifiers, QString _description,
                         bool _multiUse = false);

  public slots:
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     /** \brief add a new key Mapping
     *
     * internal function that stores a new keyCombination assignment for an existing keyBinding
     */
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    void slotAddKeyMapping(int _key, Qt::KeyboardModifiers _modifiers, QObject* _plugin, int _keyBindingID);
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     /** \brief register scripting slots to allow keyBindings
     *
     * internal function that registers all public slots without parameters of each plugin (or core)
     * to the key management system. This allows the assignment of keyBindings for each of these slots.
     */
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    void slotRegisterSlotKeyBindings();

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  public:
    ///Load key assignments from a given INI file
    void loadKeyBindings(INIFile& _ini);

    ///Store current key assignments to a given INI file
    void saveKeyBindings(INIFile& _ini);

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  private:
    /// Store the state of the shift key
    bool shiftPressed_;

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   /** @} */

  //===========================================================================
  /** @name GUI creation
  * @{ */
  //===========================================================================

  public:

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    /// Setup the main menubar
    void setupMenuBar();
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   /** @} */

  //===========================================================================
  /** @name Video Capturing
  * @{ */
  //===========================================================================

  signals:
    void startVideoCapture(QString _baseName, int _fps, bool _captureViewers);
    void stopVideoCapture();
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    void resizeViewers(int _width, int _height);
    void resizeApplication(int _width, int _height);

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  private slots:
    void startVideoCaptureDialog();
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  /** @} */
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  //===========================================================================
  /** @name Recent File Menu handling
   * @{ */
  //===========================================================================
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  public:

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  /// Add a recent file and update menu
  void addRecent(QString _filename, DataType _type);

  /// Update the recent files menu
  void updateRecent();

  /** @} */
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  //===========================================================================
  /** @name GUI Controls
  * @{ */
  //===========================================================================
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  public :
    /// Set application to Fullscreen and back
    void toggleFullscreen();
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    /// Enable or disable fullscreen mode
    void setFullscreen(bool _state );

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    /// Hide or show logging area
    void toggleLogger();
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    /// Change visibility of the logger
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    void showLogger(OpenFlipper::Options::LoggerState _state);
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    /// Hide or show toolbox area
    void toggleToolbox();
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    /// Show or hide toolbox
    void showToolbox( bool _state );

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    /// Use native or gl painted cursor
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    void setForceNativeCursor ( bool _state );
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    QSize defaultIconSize();

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  private:
    OpenFlipper::Options::LoggerState loggerState_;

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    uint fullscreenState_;
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    QSize defaultIconSize_;
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  /** @} */

  //===========================================================================
    /** @name Tool Widgets / View Modes
    * @{ */
  //===========================================================================

    private:
      /// a List of all widgets in the toolbar
      QVector<QWidget*> toolWidgets_;

    public:
      /// List of currently available viewModes
      QVector<ViewMode*>& viewModes_;

    private:

      QPushButton* viewModeButton_;

      /// Submenu holding all ViewMode actions
      QMenu* viewModeMenu_;

    public slots:

      /// init ViewModes that were loaded via ini-file
      void initViewModes(  );

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      /// Add or change Toolboxes for a ViewMode (non-userdefined viewMode)
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      void slotAddViewModeToolboxes(QString _mode, QStringList _usedWidgets);
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      /// Add or change Toolboxes for a ViewMode (_custom == userdefined viewMode)
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      void slotAddViewModeToolboxes(QString _mode, bool _custom, QStringList _usedWidgets);
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      /// Add or change Toolbars for a ViewMode (non-userdefined viewMode)
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      void slotAddViewModeToolbars(QString _mode, QStringList _usedToolbars);

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      /// Add or change Toolbars for a ViewMode (_custom == userdefined viewMode)
      void slotAddViewModeToolbars(QString _mode, bool _custom, QStringList _usedToolbars);
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      /// Completly configure a view mode ( set toolbars, toolboxes ... )
      void slotAddViewModeComplete(QString _mode , bool _custom, QStringList _toolboxes, QStringList _toolbars);
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      /// Sets the Icon for a given View Mode (non-userdefined viewMode)
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      void slotSetViewModeIcon(QString _mode, QString _iconName);
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      /// Sets the Icon for a given View Mode (_custom == userdefined viewMode)
      void slotSetViewModeIcon(QString _mode, bool _custom, QString _iconName);
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      /// Slot for Changing visible toolWidgets
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      void slotChangeView(QString _mode, QStringList _toolboxWidgets, QStringList _toolbars);
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    private slots:
      /// Remove viewMode
      void slotRemoveViewMode(QString _name);

      /// Slot for setting ViewMode from Menu
      void slotSetViewMode( QAction* action);


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      /// Show a dialog in which the viewMode can be edited
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      void slotViewModeDialog();
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      /// Show a dialog in which the viewMode can be changed
      void slotViewChangeDialog();
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      /// Set the view Mode to the given Mode
    public slots :
      void setViewMode( QString _mode );

   /** @} */



  //===========================================================================
    /** @name Basic Gui Elements
    * @{ */
  //===========================================================================

  public :

    /// Examiner Widget
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    std::vector< glViewer* >  examiner_widgets_;
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    ///Spliter between toplevel objects and the textedit at the bottom
    QSplitter* splitter_;
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    /// Textedit at the bottom for log messages
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    LoggerWidget* logWidget_;
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    /// Size of the logging window ( defaults to 240 )
    int originalLoggerSize_;

    /// QMenu containing the recently opened files
    QMenu* recentFilesMenu_;

    /// Help Menu
    QMenu* helpMenu_;

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    /// gl widget used as drawing area to paint the graphics scene
    QGLWidget* glWidget_;

    /// graphics scene used to paint gl context and widgets
    QtGLGraphicsScene* glScene_;

    /// graphics view that holds the gl scene
    QtGLGraphicsView* glView_;

    /// center widged
    QGraphicsWidget* centerWidget_;

    /// Base layout that holds gl views
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    QtMultiViewLayout* baseLayout_;
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    /// Class that holds the animated log widget
    QtSlideWindow* slidingLogger_;

    /// Temporary widget
    QWidget* tempLogWidget;

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    /// Widget for toolBox
    QWidget* toolBoxArea_;
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    /// Button to change viewModes
    QPushButton* vmChangeButton_;
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    /// Spliter between toplevel objects and toolbox
    QSplitter* toolSplitter_;

    /// Toolbox
    SideArea* toolBox_;

    /// Toolbox scroll area
    QScrollArea* toolBoxScroll_;

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    /// Toolbar showed in pickmode
    QtPickToolbar* pickToolbar_;

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    /// Cursor handling
    CursorPainter* cursorPainter_;

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    // widget showing the scenegraph
    ACG::QtWidgets::QtSceneGraphDialog* sceneGraphDialog_;

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  /** @} */

  private slots:
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    /** Creates and shows the Scenegraph Dialog
     */
    void slotShowSceneGraphDialog();


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   /** Makes the sender examiner active
    */
   void slotActivateExaminer ();


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   /** Display a log message in the Mainwidget
    * @param _type Type of Message (OUT,WARN,ERR)
    * @param _message The message to be displayed
    */
   void slotLog(Logtype _type, QString _message);

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   /** Updates the size of the main graphics widget in the scene
     */
   void sceneRectChanged(const QRectF &rect);

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  //===========================================================================
    /** @name Menubar controls
      * @{ */
  //===========================================================================
  private slots :

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    void slotAddMenubarAction( QAction* _action , QString _name );
    void slotGetMenubarMenu (QString _name, QMenu *& _menu, bool _create);
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  private:

    /// File Menu
    QMenu *fileMenu_;

    /// View Menu
    QMenu *viewMenu_;
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    /// Tools Menu
    QMenu *toolsMenu_;
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    /// First entry after all relevant parts of the File Menu
    QAction* fileMenuEnd_;

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    /// All available menus
    QMap<QString, QMenu *> menus_;

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  /** @} */
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  //===========================================================================
    /** @name ToolBar controls
      * @{ */
  //===========================================================================
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  private:
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    QToolBar* viewerToolbar_;
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    int toolbarCount_;
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    QToolButton* stereoButton_;
    QToolButton* moveButton_;
    QToolButton* lightButton_;
    QToolButton* pickButton_;
    QToolButton* questionButton_;

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    QComboBox* viewerLayoutBox_;
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  /** @} */

  //===========================================================================
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    /** @name View Menu
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      * @{ */
  //===========================================================================
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  public slots:
    /// Setup and update the global draw menu
    void slotUpdateGlobalDrawMenu();
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    /// Change viewer layout that was selected in the combo box
    void setViewerLayout(int _idx);
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  private slots:
    /// Switches over to the next view mode
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    void nextViewerLayout();
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    /// Called when the global drawMode is selected
    void slotGlobalDrawMenu(QAction * _action);
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    /// Called before the view Menu is shown
    void slotViewMenuAboutToShow();
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  private:
    /// This variable holds the global draw menu
    QMenu* globalDrawMenu_;
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    QActionGroup * drawGroup_;

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    /// Group for all menu items
    QActionGroup* viewGroup_;
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    QAction* perspectiveProjectionAction_;
    QAction* orthogonalProjectionAction_;
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    /// Action to globally set Animation
    QAction* globalAnimationAction_;
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    /// Action to globally set backface culling
    QAction* globalBackfaceCullingAction_;
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    /// Action to globally set Two-Sided lighting
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    QAction* globalTwosidedLightingAction_;

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    /// Action to globally set multisampling
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    QAction* globalMultisamplingAction_;
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    ACG::SceneGraph::DrawModes::DrawMode activeDrawModes_;
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    ACG::SceneGraph::DrawModes::DrawMode availableGlobalDrawModes_;
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  /** @} */

  //===========================================================================
    /** @name Context Menu
     * @{ */
  //===========================================================================
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  signals :
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    /// tells the plugins to update their context menu when an object is picked
    void updateContextMenu(int);

    /// tells the plugins to update their context menu when a node is picked
    void updateContextMenuNode(int);

    /// tells the plugins to update their context menu when the background is picked
    void updateContextMenuBackground();

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  private slots:
    /// This slot is called by the examiner widgets gl area when a context menu is requested
    void slotCustomContextMenu( const QPoint& _point );

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    /// called by plugins to add a new context menu item
    void slotAddContextItem(QAction* _entry, ContextMenuType _type);
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    /// called by plugins to add a real context menu item depending on DataType
    void slotAddContextItem( QAction* _entry , DataType _dataType ,ContextMenuType type_);
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    /// Paste the view to the last active examiner
    void slotPasteView( );

    /// Copy view from the last active examiner
    void slotCopyView( );

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    /// Called when a coordsys drawMode has been changed
    void slotViewerDrawMenu( QAction * _action );
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    /// Creates a draw Menu for the currently active Viewer
    void slotUpdateViewerDrawMenu();
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    /// Create a snapshot of the last active examiner
    void slotSnapshot();

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    /// Show / hide wheels
    void slotSwitchWheels(bool _state);

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    /// Switch navigation mode
    void slotSwitchNavigation(bool _egomode);

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    /// Set the snapShot name for all examiners
    void slotSnapshotName();

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    /// Hide coordinate systems in all viewers
    void slotCoordSysVisibility(bool _visible);

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  private :
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    /** Update the contextmenu for the given position inside an examiner widget
     *
     * @param _point      Picking position in coordinates of the viewer
     */
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    void updatePopupMenu(const QPoint& _point);

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    void updatePopupMenuCoordsysNode(QMenu* _menu , const int _part);
    void updatePopupMenuObject(QMenu* _menu , BaseObjectData* _object );
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    void updatePopupMenuBackground(QMenu* _menu , const QPoint& _point);
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    void updatePopupMenuNode(QMenu* _menu , ACG::SceneGraph::BaseNode* _node);

    bool addContextMenus( QMenu* _menu , ContextMenuType _type, int _id = -1);
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  private :
    /// context Menu for the gl area
    QMenu*  contextMenu_;

    /// Context Menu containing all selection elements
    QMenu*  contextSelectionMenu_;

    /// All real context menu entries
    std::vector< MenuInfo > contextMenus_;
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    /// DrawGroup for per Viewer Draw Modes
    QActionGroup* drawGroupViewer_;
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    /// Draw Menu for per Viewer Draw Modes
    QMenu* viewerDrawMenu_;
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    /// Menu which holds the context menu entries for
    /// the coordsys node if invisible
    QMenu* coordSysMenu_;

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  /** @} */

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  //===========================================================================
    /** @name Snapshots
     * @{ */
  //===========================================================================

  private:

    QString snapshotName_;
    int     snapshotCounter_;

  public slots:

    /// Create a snapshot of the whole app with fileDialog
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    void viewerSnapshotDialog();
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    /// Create a snapshot of the whole app
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    void viewerSnapshot();
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    /// Create a snapshot of the whole app with fileDialog
    void applicationSnapshotDialog();

    /// Create a snapshot of the whole app
    void applicationSnapshot();

    /// Set the snapshot name
    void applicationSnapshotName(QString _name);


  /** @} */

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  //===========================================================================
    /** @name StackWidget controls
    * @{ */
  //===========================================================================

  private slots:
    void slotGetStackWidget( QString _name, QWidget*& _widget );
    void slotAddStackWidget( QString _name, QWidget* _widget );
    void slotUpdateStackWidget( QString _name, QWidget* _widget );

    void slotViewMenuAction( QAction * _action);

    void slotUpdateStackMenu();


  private :
    /// QMenu containing the recently opened files
    QMenu* stackMenu_;

    std::vector< StackWidgetInfo > stackWidgetList_;

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  public :
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    /// Container widget for holding multiple views
    QStackedWidget* stackedWidget_;

  /** @} */

  //===========================================================================
  /** @name Help System
  * @{ */
  //===========================================================================

  public slots:
    /// Display the help Browser
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    void showHelpBrowser();
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  private:
    /// Pointer to the help Browser
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    HelpWidget* helpWidget_;
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  /** @} */
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  //===========================================================================
  /** @name Stereo View Mode
  * @{ */
  //===========================================================================

  public slots:
      /// Creates custom context menu for stereo viewer settings
    void stereoButtonContextMenu(const QPoint& _pos);

    /// Is called if the user has changed stereo settings
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    /// Note: The parameter just makes sure, we can connect
    /// all necessary signals to this slot. It has no use for now.
    void slotApplyStereoSettings(int _tmpParam = 0);
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  private:
    /// Widget to change stereo settings
    StereoSettingsWidget* stereoSettingsWidget_;

  /** @} */

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  //===========================================================================
  /** @name About System
  * @{ */
  //===========================================================================

  public slots:
    /// Display the about widget
    void showAboutWidget();

  private:
    /// Pointer to the about widget
    AboutWidget* aboutWidget_;

  /** @} */

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  //===========================================================================
  /** @name Options System
  * @{ */
  //===========================================================================

  public slots:
    /// Display the Options Browser
    void showOptionsWidget();

  signals:
    void applyOptions();
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    void saveOptions();
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  private:

    /// Pointer to the OptionsWidget
    OptionsWidget* optionsWidget_;

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  /** @} */

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  //===========================================================================
  /** @name ToolBar controls
  * @{ */
  //===========================================================================
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  private slots:
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    /// Called by Plugins to add a Toolbar
    void slotAddToolbar(QToolBar* _toolbar);
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    /// Called by Plugins to remove a Toolbar
    void slotRemoveToolbar(QToolBar* _toolbar);

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    /// Called by Plugins to get access to specific Toolbars by name
    void getToolBar( QString _name, QToolBar*& _toolbar);

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  private :
    QToolBar* mainToolbar_;
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    std::vector< QToolBar* > toolbars_;

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  /** @} */

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  //===========================================================================
  /** @name StatusBar controls
   * @{ */
  //===========================================================================
  public slots:
    void statusMessage(QString _message, int _timeout = 0);
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    void clearStatusMessage();
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    void setStatus( ApplicationStatus::applicationStatus _status);
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    void addWidgetToStatusbar(QWidget* _widget);
    
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  private:
    void setupStatusBar();
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  private :
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    ColorStatusBar* statusBar_;
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    QLabel* statusIcon_;
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  /** @} */

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  //===========================================================================
  /** @name Drag and Drop
   * @{ */
  //===========================================================================
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  signals:
    void dragOpenFile(QString _filename);
  
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  private slots:
    void startDrag( QMouseEvent* _event );
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    void dragEnterEvent(QDragEnterEvent* _event);
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    void dropEvent( QDropEvent* _event );
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  /** @} */

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  private :

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  std::vector<PluginInfo>& plugins_;
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  //===========================================================================
  /** @name Viewer Controls
   * @{ */
  //===========================================================================

  private slots:

    /// Enable or disable Stereo
    void slotToggleStereoMode();

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    /// Set Background Color for all viewers at once.
    void slotSetGlobalBackgroundColor();
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    /// Set Background Color for one viewer.
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    void slotSetContextBackgroundColor();
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    /// Set the active viewer to home position
    void slotContextHomeView();
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    /// Set the viewer to home position
    void slotGlobalHomeView();
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    /// Set the active viewers home position
    void slotContextSetHomeView();
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    /// Set the home position for all viewers
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    void slotGlobalSetHomeView();
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    /// Change view on active viewer to view complete scene
    void slotContextViewAll();

    /// Change view on all viewers to view complete scene
    void slotGlobalViewAll();
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    /// Toggle projection Mode of the active viewer.
    void slotContextSwitchProjection();
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    /// Toggle projection Mode of all viewers to perspective projection
    void slotGlobalPerspectiveProjection();

    /// Toggle projection Mode of all viewers to orthographic projection
    void slotGlobalOrthographicProjection();
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    /// Change the Viewing direction from context-menu
    void slotSetViewingDirection(QAction* _action);

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    /// Set the animation Mode for all viewers
    void slotGlobalChangeAnimation(bool _animation);

    /// Set the animation Mode for active viewer
    void slotLocalChangeAnimation(bool _animation);
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    /// Set Backface culling for all viewers
    void slotGlobalChangeBackFaceCulling(bool _backFaceCulling);
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    /// Set Backface culling for active viewer
    void slotLocalChangeBackFaceCulling(bool _backFaceCulling);
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    /// Set two sided lighting for all viewers
    void slotGlobalChangeTwoSidedLighting(bool _lighting);
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    /// Set two sided lighting for active viewer
    void slotLocalChangeTwoSidedLighting(bool _lighting);
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    /// Set Multisampling for all viewers
    void slotGlobalChangeMultisampling(bool _lighting);

    /// Set Multisampling for active viewer
    void slotLocalChangeMultisampling(bool _lighting);
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    /// When using first person mode move backward
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    void moveBack();
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    /// When using first person mode move forward
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    void moveForward();
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    /// When using first person mode strafe to the left
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    void strafeLeft();
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    /// When using first person mode strafe to the right
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    void strafeRight();
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  private :
    bool stereoActive_;

  /** @} */
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  //===========================================================================
  /** @name Action Mode States
   * @{ */
  //===========================================================================

  public slots:

    bool examineMode() { return(actionMode_ == Viewer::ExamineMode  ); };
    bool pickingMode() { return(actionMode_ == Viewer::PickingMode  ); };
    bool lightMode()   { return(actionMode_ == Viewer::LightMode    ); };
    bool questionMode(){ return(actionMode_ == Viewer::QuestionMode ); };

    /** Set action mode.
      The ActionMode determines the type of reaction on mouse events.
    */
    void setExamineMode() { setActionMode(Viewer::ExamineMode  ); };
    void setPickingMode() { setActionMode(Viewer::PickingMode  ); };
    void setLightMode()   { setActionMode(Viewer::LightMode    ); };
    void setQuestionMode(){ setActionMode(Viewer::QuestionMode ); };

    void setActionMode(const Viewer::ActionMode  _am);
    void getActionMode(Viewer::ActionMode& _am);

  public:
    Viewer::ActionMode actionMode() { return actionMode_; };
    Viewer::ActionMode lastActionMode() { return lastActionMode_; };

  private :
    Viewer::ActionMode actionMode_, lastActionMode_;

  /** @} */

  //===========================================================================
  /** @name PickModes
   * @{ */
  //===========================================================================

  public:

    /** \brief  add pick mode
     *
     *  @param _name Name of the Pick Mode or "Separator" to insert a separator
     *  @param _mouse_tracking true: every mouse movement will emit mouse events not only when mousebutton is pressed
     *  @param _pos position to insert the mode in the popup menu.
     */
    void addPickMode(const std::string& _name,
                     bool               _mouse_tracking = false,
                     int                _pos            = -1,
                     bool               _visible        = true,
                     QCursor            _cursor         = Qt::ArrowCursor );

    /** clear all pick modes
     */
    void clearPickModes();

    /** return the currently active pick mode
     */
    const std::string& pickMode() const;

    /** Switch to given picking mode
     * @param _id Id of the picking Mode
     */
    void pickMode( int _id );

  public slots:

    /** Switch to given picking mode
     * @param _name Name of the picking mode
     */
    void setPickMode(const std::string  _name);


    void getPickMode(std::string& _name);

  public slots:

    /** \brief  set a new cursor for the pick mode
     *
     *  @param _name Name of the Pick Mode
     *  @param _cursor the new cursor
     */
    void setPickModeCursor(const std::string& _name, QCursor _cursor);

    /** \brief  set mouseTracking for the pick mode
     *
     *  @param _name Name of the Pick Mode
     *  @param _mouseTracking true: every mouse movement will emit mouse events not only when mousebutton is pressed
     */
    void setPickModeMouseTracking(const std::string& _name, bool _mouseTracking);

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    /** \brief Set the additinal toolbar of the given PickMode
     *
     * Set the additional toolbar that should be shown in the pickMode
     *
     * @param _mode Identifier of Picking mode
     * @param _toolbar the toolbar
     */
    void setPickModeToolbar( const std::string _mode , QToolBar * _toolbar );

    /** \brief Removes the additinal toolbar of the given PickMode
     *
     * Set the additional toolbar that should be shown in the pickMode
     *
     * @param _mode Identifier of Picking mode
     */
    void removePickModeToolbar( const std::string _mode );

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    void actionPickMenu( QAction * _action );

  signals:
    /** This signal is emitted when the pickMode is changed and contains the new PickMode
     */
    void signalPickModeChanged(const std::string&);

  private:

    QMenu* pickMenu_;

    /** Struct containing information about pickModes
     */
    struct PickMode
    {
      /// Constructor
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      PickMode(const std::string& _n, bool _t, bool _v, QCursor _c, QToolBar *_tb = NULL) :
               name(_n), tracking(_t), visible(_v), cursor(_c), toolbar(_tb) {}
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      /// Name of the pickMode
      std::string  name;

      /** MouseTracking enabled for this mode?
       */
      bool         tracking;

      /** Defines if the Mode will be visible in the popup Menu
       */
      bool         visible;

      /** Cursor used in  this pickMode
       */
      QCursor      cursor;
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      /** Additinal toolbar showd in this pickMode
       */
      QToolBar *   toolbar;
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    };

    /** Vector of all Picking modes
     */
    std::vector<PickMode>  pick_modes_;

    /** Name of current pickMode
     */
    std::string            pick_mode_name_;

    /** Index of current pickMode
     */
    int                    pick_mode_idx_;


    /// update pick mode menu
    void updatePickMenu();

  private slots:

    void hidePopupMenus();
  /** @} */

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};


//=============================================================================
#endif // COREWIDGET_HH defined
//=============================================================================