qgsmodelgraphicsview.h

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/***************************************************************************
                             qgsmodelgraphicsview.h
                             -----------------------
    Date                 : March 2020
    Copyright            : (C) 2020 Nyall Dawson
    Email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSMODELGRAPHICVIEW_H
#define QGSMODELGRAPHICVIEW_H
 
#include "qgis.h"
#include "qgis_gui.h"
#include "qgsprocessingcontext.h"
#include "qgsmodelsnapper.h"
#include <QGraphicsView>
#include <QGraphicsRectItem>
 
class QgsModelViewTool;
class QgsModelViewToolTemporaryKeyPan;
class QgsModelViewToolTemporaryKeyZoom;
class QgsModelViewToolTemporaryMousePan;
class QgsModelComponentGraphicItem;
class QgsModelGraphicsScene;
class QgsModelViewSnapMarker;
 
 
class GUI_EXPORT QgsModelGraphicsView : public QGraphicsView
{
    Q_OBJECT
 
  public:
    QgsModelGraphicsView( QWidget *parent = nullptr );
    ~QgsModelGraphicsView() override;
 
    void dragEnterEvent( QDragEnterEvent *event ) override;
    void dropEvent( QDropEvent *event ) override;
    void dragMoveEvent( QDragMoveEvent *event ) override;
    void wheelEvent( QWheelEvent *event ) override;
    void mousePressEvent( QMouseEvent *event ) override;
    void mouseReleaseEvent( QMouseEvent *event ) override;
    void mouseMoveEvent( QMouseEvent *event ) override;
    void mouseDoubleClickEvent( QMouseEvent *event ) override;
    void keyPressEvent( QKeyEvent *event ) override;
    void keyReleaseEvent( QKeyEvent *event ) override;
 
    void setModelScene( QgsModelGraphicsScene *scene );
 
    QgsModelGraphicsScene *modelScene() const;
 
    QgsModelViewTool *tool() SIP_SKIP;
 
    void setTool( QgsModelViewTool *tool ) SIP_SKIP;
 
    void unsetTool( QgsModelViewTool *tool ) SIP_SKIP;
 
    QgsModelSnapper *snapper() SIP_SKIP;
 
    void startMacroCommand( const QString &text );
 
    void endMacroCommand();
 
    void beginCommand( const QString &text );
 
    void endCommand();
 
 
    enum ClipboardOperation
    {
      ClipboardCut,  
      ClipboardCopy, 
    };
 
    void copySelectedItems( ClipboardOperation operation );
 
    void copyItems( const QList<QgsModelComponentGraphicItem *> &items, ClipboardOperation operation );
 
    enum PasteMode
    {
      PasteModeCursor,  
      PasteModeCenter,  
      PasteModeInPlace, 
    };
 
    void pasteItems( PasteMode mode );
 
  public slots:
 
    void snapSelected();
 
  signals:
 
    void algorithmDropped( const QString &algorithmId, const QPointF &pos );
 
    void inputDropped( const QString &inputId, const QPointF &pos );
 
    void toolSet( QgsModelViewTool *tool ) SIP_SKIP;
 
    void itemFocused( QgsModelComponentGraphicItem *item );
 
    void willBeDeleted();
 
    void macroCommandStarted( const QString &text );
 
    void macroCommandEnded();
 
    void commandBegun( const QString &text );
 
    void commandEnded();
 
    void deleteSelectedItems();
 
  private:
    void wheelZoom( QWheelEvent *event );
 
    void scaleSafe( double scale );
 
    QPointF deltaForKeyEvent( QKeyEvent *event );
 
    QPointer<QgsModelViewTool> mTool;
 
    QgsModelViewToolTemporaryKeyPan *mSpacePanTool = nullptr;
    QgsModelViewToolTemporaryMousePan *mMidMouseButtonPanTool = nullptr;
    QgsModelViewToolTemporaryKeyZoom *mSpaceZoomTool = nullptr;
 
    QPoint mMouseCurrentXY;
 
    QgsModelSnapper mSnapper;
    QgsModelViewSnapMarker *mSnapMarker = nullptr;
};
 
 
class GUI_EXPORT QgsModelViewSnapMarker : public QGraphicsRectItem
{
  public:
    QgsModelViewSnapMarker();
 
    void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr ) override;
 
  private:
    int mSize = 0;
};
 
 
 
#endif // QGSMODELGRAPHICVIEW_H