src/GraphicsView/GraphicsView_ViewPort.h

   1 // Copyright (C) 2013-2023  CEA/DEN, EDF R&D, OPEN CASCADE
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
  18 //
  19
  20 #ifndef GRAPHICSVIEW_VIEWPORT_H
  21 #define GRAPHICSVIEW_VIEWPORT_H
  22
  23 #include "GraphicsView.h"
  24
  25 #include "GraphicsView_Defs.h"
  26
  27 #include <QGraphicsView>
  28 #include <QPainterPath>
  29
  30 class QGridLayout;
  31 class QRubberBand;
  32
  33 class GraphicsView_Object;
  34 class GraphicsView_Scene;
  35
  36 /*
  37   Class       : GraphicsView_ViewPort
  38   Description : View port of the graphics view
  39 */
  40 class GRAPHICSVIEW_API GraphicsView_ViewPort : public QGraphicsView
  41 {
  42   Q_OBJECT
  43
  44 public:
  45   class ViewLabel;
  46
  47   enum InteractionFlag
  48   {
  49     // main flags
  50     Dragging               = 0x0001,
  51     Pulling                = 0x0002,
  52     WheelScaling           = 0x0004,
  53     EditFlags              = Dragging | Pulling | WheelScaling,
  54     // advanced flags
  55     TraceBoundingRect      = 0x0008,
  56     DraggingByMiddleButton = 0x0010,
  57     ImmediateContextMenu   = 0x0020,
  58     ImmediateSelection     = 0x0040,
  59     Sketching              = 0x0080,
  60
  61     GlobalWheelScaling     = 0x0100
  62   };
  63   Q_DECLARE_FLAGS( InteractionFlags, InteractionFlag )
  64
  65   enum BlockStatus
  66   {
  67     BS_NoBlock   = 0x0000,
  68     BS_Selection = 0x0001, // and highlighting
  69     BS_Dragging  = 0x0002  // currently unused
  70   };
  71
  72   enum ViewLabelPosition
  73   {
  74     VLP_None         = 0,
  75     VLP_TopLeft      = 1,
  76     VLP_TopRight     = 2,
  77     VLP_BottomLeft   = 3,
  78     VLP_BottomRight  = 4
  79   };
  80
  81 public:
  82   GraphicsView_ViewPort( QWidget* theParent );
  83   ~GraphicsView_ViewPort();
  84
  85 public:
  86   GraphicsView_Scene*              getScene() { return myScene; }
  87   void                             addItem( QGraphicsItem* theItem );
  88   bool                             isItemAdded( QGraphicsItem* theItem );
  89   void                             removeItem( QGraphicsItem* theItem );
  90   void                             clearItems();
  91
  92   enum SortType { NoSorting, SelectedFirst, SortByZLevel };
  93   GraphicsView_ObjectList          getObjects( SortType theSortType = NoSorting ) const;
  94
  95   QRectF                           objectsBoundingRect( bool theOnlyVisible = false ) const;
  96
  97   QImage                           dumpView( bool theWholeScene = false,
  98                                              QSizeF theSize = QSizeF() );
  99
 100   bool                             dumpViewToFormat(const QString& fileName, const QString& format);
 101
 102 public:
 103   // scene
 104   void                             setSceneGap( double theSceneGap );
 105   void                             setFitAllGap( double theFitAllGap );
 106
 107   // interaction flags
 108   int                              interactionFlags() const;
 109   bool                             hasInteractionFlag( InteractionFlag theFlag );
 110   void                             setInteractionFlag( InteractionFlag theFlag,
 111                                                        bool theIsEnabled = true );
 112   void                             setInteractionFlags( InteractionFlags theFlags );
 113
 114   // view label
 115   void                             setViewLabelPosition( ViewLabelPosition thePosition,
 116                                                          bool theIsForced = false );
 117   void                             setViewLabelText( const QString& theText );
 118
 119   // displaying mouse position (currently, overlaps with view label feature)
 120   void                             setMousePositionEnabled( bool theState );
 121
 122   // background / foreground
 123   QColor                           backgroundColor() const;
 124   void                             setBackgroundColor( const QColor& theColor );
 125
 126   bool                             isForegroundEnabled() const { return myIsForegroundEnabled; }
 127   void                             setForegroundEnabled( bool theState );
 128
 129   QSizeF                           foregroundSize() const { return myForegroundSize; }
 130   void                             setForegroundSize( const QSizeF& theRect );
 131
 132   double                           foregroundMargin() const { return myForegroundMargin; }
 133   void                             setForegroundMargin( double theMargin );
 134
 135   QColor                           foregroundColor() const { return myForegroundColor; }
 136   void                             setForegroundColor( const QColor& theColor );
 137
 138   QColor                           foregroundFrameColor() const { return myForegroundFrameColor; }
 139   void                             setForegroundFrameColor( const QColor& theColor );
 140
 141   double                           foregroundFrameLineWidth() const { return myForegroundFrameLineWidth; }
 142   void                             setForegroundFrameLineWidth( double theLineWidth );
 143
 144   void                             updateForeground();
 145
 146   // grid
 147   void                             setGridEnabled( bool theState );
 148   void                             setGridCellSize( int theCellSize );
 149   void                             setGridLineStyle( int theLineStyle );
 150   void                             setGridLineColor( const QColor& theLineColor );
 151   void                             updateGrid();
 152
 153   // transformation
 154   void                             reset();
 155   void                             pan( double theDX, double theDY );
 156   void                             setCenter( double theX, double theY );
 157   void                             zoom( double theX1, double theY1, double theX2, double theY2 );
 158   void                             fitRect( const QRectF& theRect );
 159   void                             fitSelect();
 160   void                             fitAll( bool theKeepScale = false );
 161   void                             fitWidth();
 162
 163   bool                             isTransforming() const { return myIsTransforming; }
 164
 165   void                             applyTransform();
 166
 167   int                              zoomCoeff() const { return myZoomCoeff; }
 168   void                             setZoomCoeff( const int& theZoomCoeff );
 169
 170   bool                             isUnlimitedPanning() const { return myUnlimitedPanning; }
 171   void                             setUnlimitedPanning( const bool& theValue );
 172
 173   // block status
 174   BlockStatus                      currentBlock();
 175
 176   // highlighting
 177   virtual void                     highlight( double theX, double theY );
 178   void                             clearHighlighted();
 179
 180   GraphicsView_Object*             getHighlightedObject() const { return myHighlightedObject; }
 181
 182   // selection
 183   virtual int                      select( const QRectF& theRect, bool theIsAppend );
 184   void                             clearSelected();
 185   void                             setSelected( GraphicsView_Object* theObject );
 186
 187   int                              nbSelected() const;
 188   void                             initSelected();
 189   bool                             moreSelected();
 190   bool                             nextSelected();
 191   GraphicsView_Object*             selectedObject();
 192
 193   const GraphicsView_ObjectList&   getSelectedObjects() const { return mySelectedObjects; }
 194
 195   // rectangle selection
 196   void                             startSelectByRect( int x, int y );
 197   void                             drawSelectByRect( int x, int y );
 198   void                             finishSelectByRect();
 199   bool                             isSelectByRect() const;
 200   QRect                            selectionRect();
 201
 202   // sketching
 203   void                             prepareToSketch( bool theStatus );
 204   bool                             isPrepareToSketch();
 205   void                             startSketching( const QPointF& thePoint,
 206                                                    bool theIsPath );
 207   void                             drawSketching( const QPointF& thePoint );
 208   void                             finishSketching( bool theStatus );
 209   bool                             isSketching( bool* theIsPath = 0 ) const;
 210
 211   // dragging
 212   bool                             isDragging() { return myIsDragging; }
 213
 214   bool                             isDraggingSelectedByLeftButton() const { return myDraggingSelectedByLeftButton; }
 215   void                             setDraggingSelectedByLeftButton( const bool& theValue );
 216
 217   // pulling
 218   bool                             startPulling( const QPointF& );
 219   void                             drawPulling( const QPointF& );
 220   void                             finishPulling( bool theStatus );
 221   bool                             isPulling() const { return myIsPulling; }
 222
 223   // other
 224   bool                             cancelCurrentOperation();
 225
 226 public:
 227   static void                      createCursors();
 228   static void                      destroyCursors();
 229   static QCursor*                  getDefaultCursor() { return defCursor; }
 230   static QCursor*                  getHandCursor() { return handCursor; }
 231   static QCursor*                  getPanCursor() { return panCursor; }
 232   static QCursor*                  getPanglCursor() { return panglCursor; }
 233   static QCursor*                  getZoomCursor() { return zoomCursor; }
 234   static QCursor*                  getSketchCursor() { return sketchCursor; }
 235
 236 public slots:
 237   void                             onBoundingRectChanged();
 238
 239 protected slots:
 240   void                             onKeyEvent( QKeyEvent* );
 241   void                             onMouseEvent( QGraphicsSceneMouseEvent* );
 242   void                             onWheelEvent( QGraphicsSceneWheelEvent* );
 243   void                             onContextMenuEvent( QGraphicsSceneContextMenuEvent* );
 244
 245 protected:
 246   virtual void                     scrollContentsBy( int theDX, int theDY );
 247
 248 signals:
 249   void                             vpKeyEvent( QKeyEvent* );
 250   void                             vpMouseEvent( QGraphicsSceneMouseEvent* );
 251   void                             vpWheelEvent( QGraphicsSceneWheelEvent* );
 252   void                             vpContextMenuEvent( QGraphicsSceneContextMenuEvent* );
 253
 254   void                             vpSketchingFinished( QPainterPath );
 255
 256   void                             vpObjectBeforeMoving();
 257   void                             vpObjectAfterMoving( bool );
 258
 259 private:
 260   void                             initialize();
 261   void                             cleanup();
 262
 263   void                             dragObjects( QGraphicsSceneMouseEvent* );
 264
 265 private:
 266   static int                       nCounter;
 267   static QCursor*                  defCursor;
 268   static QCursor*                  handCursor;
 269   static QCursor*                  panCursor;
 270   static QCursor*                  panglCursor;
 271   static QCursor*                  zoomCursor;
 272   static QCursor*                  sketchCursor;
 273
 274 private:
 275   // scene
 276   GraphicsView_Scene*              myScene;
 277   double                           mySceneGap;
 278   double                           myFitAllGap;
 279   GraphicsView_ObjectList          myObjects;
 280
 281   // interaction flags
 282   InteractionFlags                 myInteractionFlags;
 283
 284   // view label
 285   ViewLabel*                       myViewLabel;
 286   ViewLabelPosition                myViewLabelPosition;
 287   QGridLayout*                     myViewLabelLayout;
 288
 289   // displaying mouse position (currently, overlaps with view label feature)
 290   bool                             myIsMousePositionEnabled;
 291
 292   // foreground
 293   bool                             myIsForegroundEnabled;
 294   QSizeF                           myForegroundSize;
 295   double                           myForegroundMargin;
 296   QColor                           myForegroundColor;
 297   QColor                           myForegroundFrameColor;
 298   double                           myForegroundFrameLineWidth;
 299   QGraphicsRectItem*               myForegroundItem;
 300
 301   // grid
 302   bool                             myIsGridEnabled;
 303   int                              myGridCellSize;
 304   int                              myGridLineStyle;
 305   QColor                           myGridLineColor;
 306   QGraphicsPathItem*               myGridItem;
 307
 308   // transformation
 309   bool                             myIsTransforming;
 310   QTransform                       myCurrentTransform;
 311
 312   bool                             myUnlimitedPanning;
 313   Qt::ScrollBarPolicy              myHBarPolicy;
 314   Qt::ScrollBarPolicy              myVBarPolicy;
 315
 316   // highlighting
 317   GraphicsView_Object*             myHighlightedObject;
 318   double                           myHighlightX;
 319   double                           myHighlightY;
 320   bool                             myIsHighlighting;
 321
 322   // selection
 323   GraphicsView_ObjectList          mySelectedObjects;
 324   int                              mySelectionIterator;
 325
 326   // rectangle selection
 327   QRubberBand*                     myRectBand;
 328   QPoint                           myFirstSelectionPoint;
 329   QPoint                           myLastSelectionPoint;
 330   bool                             myAreSelectionPointsInitialized;
 331
 332   // sketching
 333   QGraphicsPathItem*               mySketchingItem;
 334   QPointF                          mySketchingPoint;
 335   bool                             myIsPrepareToSketch;
 336   bool                             myIsSketching;
 337   bool                             myIsSketchingByPath;
 338
 339   // dragging
 340   int                              myIsDragging;
 341   QPointF                          myDragPosition;
 342   bool                             myIsDragPositionInitialized;
 343   bool                             myDraggingSelectedByLeftButton;
 344
 345   // pulling
 346   bool                             myIsPulling;
 347   GraphicsView_Object*             myPullingObject;
 348
 349   // cursor
 350   QCursor                          myStoredCursor;
 351
 352   // zoom diagonal coefficient
 353   int                              myZoomCoeff;
 354 };
 355
 356 Q_DECLARE_OPERATORS_FOR_FLAGS( GraphicsView_ViewPort::InteractionFlags )
 357
 358 #endif