qgslayoutview.h

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/***************************************************************************
                             qgslayoutview.h
                             ---------------
    Date                 : July 2017
    Copyright            : (C) 2017 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 QGSLAYOUTVIEW_H
#define QGSLAYOUTVIEW_H
 
#include "qgis_sip.h"
#include "qgsprevieweffect.h" // for QgsPreviewEffect::PreviewMode
#include "qgis_gui.h"
#include "qgslayoutitempage.h"
#include "qgslayoutaligner.h"
#include "qgslayoutviewtool.h"
#include <QPointer>
#include <QGraphicsView>
#include <QGraphicsRectItem>
#include <memory>
 
class QMenu;
class QgsLayout;
class QgsLayoutViewToolTemporaryKeyPan;
class QgsLayoutViewToolTemporaryKeyZoom;
class QgsLayoutViewToolTemporaryMousePan;
class QgsLayoutRuler;
class QgsLayoutViewMenuProvider;
class QgsLayoutViewSnapMarker;
class QgsLayoutReportSectionLabel;
 
class GUI_EXPORT QgsLayoutView: public QGraphicsView
{
 
#ifdef SIP_RUN
    SIP_CONVERT_TO_SUBCLASS_CODE
    if ( qobject_cast<QgsLayoutView *>( sipCpp ) )
      sipType = sipType_QgsLayoutView;
    else
      sipType = NULL;
    SIP_END
#endif
 
    Q_OBJECT
 
    Q_PROPERTY( QgsLayout *currentLayout READ currentLayout WRITE setCurrentLayout NOTIFY layoutSet )
    Q_PROPERTY( QgsLayoutViewTool *tool READ tool WRITE setTool NOTIFY toolSet )
 
  public:
 
    enum ClipboardOperation
    {
      ClipboardCut, 
      ClipboardCopy, 
    };
 
    enum PasteMode
    {
      PasteModeCursor, 
      PasteModeCenter, 
      PasteModeInPlace, 
    };
 
    QgsLayoutView( QWidget *parent SIP_TRANSFERTHIS = nullptr );
 
    ~QgsLayoutView() override;
 
    QgsLayout *currentLayout();
 
    SIP_SKIP const QgsLayout *currentLayout() const;
 
    void setCurrentLayout( QgsLayout *layout SIP_KEEPREFERENCE );
 
    QgsLayoutViewTool *tool();
 
    void setTool( QgsLayoutViewTool *tool );
 
    void unsetTool( QgsLayoutViewTool *tool );
 
    void setPreviewModeEnabled( bool enabled );
 
    bool previewModeEnabled() const;
 
    void setPreviewMode( QgsPreviewEffect::PreviewMode mode );
 
    QgsPreviewEffect::PreviewMode previewMode() const;
 
    void scaleSafe( double scale );
 
    void setZoomLevel( double level );
 
    void setHorizontalRuler( QgsLayoutRuler *ruler );
 
    void setVerticalRuler( QgsLayoutRuler *ruler );
 
    void setMenuProvider( QgsLayoutViewMenuProvider *provider SIP_TRANSFER );
 
    QgsLayoutViewMenuProvider *menuProvider() const;
 
    int currentPage() const { return mCurrentPage; }
 
    QList< QgsLayoutItemPage * > visiblePages() const;
 
    QList< int > visiblePageNumbers() const;
 
    void alignSelectedItems( QgsLayoutAligner::Alignment alignment );
 
    void distributeSelectedItems( QgsLayoutAligner::Distribution distribution );
 
    void resizeSelectedItems( QgsLayoutAligner::Resize resize );
 
    void copySelectedItems( ClipboardOperation operation );
 
    void copyItems( const QList< QgsLayoutItem * > &items, ClipboardOperation operation );
 
    QList< QgsLayoutItem * > pasteItems( PasteMode mode );
 
    QList< QgsLayoutItem * > pasteItems( QPointF layoutPoint );
 
    bool hasItemsInClipboard() const;
 
    QPointF deltaForKeyEvent( QKeyEvent *event );
 
    void setPaintingEnabled( bool enabled ); SIP_SKIP
 
    void setSectionLabel( const QString &label );
 
  public slots:
 
    void zoomFull();
 
    void zoomWidth();
 
    void zoomIn();
 
    void zoomOut();
 
    void zoomActual();
 
    // NOTE - I realize these emitXXX methods are gross, but there's no clean
    // alternative here. We can't override the non-virtual Qt QGraphicsView
    // methods, and adding our own renamed methods which call the base class
    // methods also adds noise to the API.
    void emitZoomLevelChanged();
 
    // Why are these select methods in the view and not in the scene (QgsLayout)?
    // Well, in my opinion selections are purely a GUI concept. Ideally
    // NONE of the selection handling would be done in core, but we're restrained
    // by the QGraphicsScene API here.
 
    void selectAll();
 
    void deselectAll();
 
    void invertSelection();
 
    void selectNextItemAbove();
 
    void selectNextItemBelow();
 
    void raiseSelectedItems();
 
    void lowerSelectedItems();
 
    void moveSelectedItemsToTop();
 
    void moveSelectedItemsToBottom();
 
    void lockSelectedItems();
 
    void unlockAllItems();
 
    void deleteSelectedItems();
 
    void deleteItems( const QList< QgsLayoutItem * > &items );
 
    void groupSelectedItems();
 
    void ungroupSelectedItems();
 
    void viewChanged();
 
    void pushStatusMessage( const QString &message );
 
  signals:
 
    void layoutSet( QgsLayout *layout );
 
    void toolSet( QgsLayoutViewTool *tool );
 
    void zoomLevelChanged();
 
    void cursorPosChanged( QPointF layoutPoint );
 
    void pageChanged( int page );
 
    void statusMessage( const QString &message );
 
    void itemFocused( QgsLayoutItem *item );
 
    void willBeDeleted();
 
  protected:
    void mousePressEvent( QMouseEvent *event ) override;
    void mouseReleaseEvent( QMouseEvent *event ) override;
    void mouseMoveEvent( QMouseEvent *event ) override;
    void mouseDoubleClickEvent( QMouseEvent *event ) override;
    void wheelEvent( QWheelEvent *event ) override;
    void keyPressEvent( QKeyEvent *event ) override;
    void keyReleaseEvent( QKeyEvent *event ) override;
    void resizeEvent( QResizeEvent *event ) override;
    void scrollContentsBy( int dx, int dy ) override;
    void dragEnterEvent( QDragEnterEvent *e ) override;
    void paintEvent( QPaintEvent *event ) override;
    void showEvent( QShowEvent *event ) override;
 
  private slots:
 
    void invalidateCachedRenders();
    void updateDevicePixelFromScreen();
 
  private:
 
    void wheelZoom( QWheelEvent *event );
 
    QPointer< QgsLayoutViewTool > mTool;
 
    QgsLayoutViewToolTemporaryKeyPan *mSpacePanTool = nullptr;
    QgsLayoutViewToolTemporaryMousePan *mMidMouseButtonPanTool = nullptr;
    QgsLayoutViewToolTemporaryKeyZoom *mSpaceZoomTool = nullptr;
 
    QPoint mMouseCurrentXY;
 
    QgsLayoutRuler *mHorizontalRuler = nullptr;
    QgsLayoutRuler *mVerticalRuler = nullptr;
    std::unique_ptr< QgsLayoutViewMenuProvider > mMenuProvider;
 
    QgsLayoutViewSnapMarker *mSnapMarker = nullptr;
    QgsLayoutReportSectionLabel *mSectionLabel = nullptr;
 
    QGraphicsLineItem *mHorizontalSnapLine = nullptr;
    QGraphicsLineItem *mVerticalSnapLine = nullptr;
 
    int mCurrentPage = 0;
 
    QgsPreviewEffect *mPreviewEffect = nullptr;
 
    bool mPaintingEnabled = true;
 
    double mScreenDpi = 96.0;
    QMetaObject::Connection mScreenDpiChangedConnection;
 
    friend class TestQgsLayoutView;
    friend class QgsLayoutMouseHandles;
 
    QGraphicsLineItem *createSnapLine() const;
};
 
 
class GUI_EXPORT QgsLayoutViewMenuProvider
{
  public:
    virtual ~QgsLayoutViewMenuProvider() = default;
 
    virtual QMenu *createContextMenu( QWidget *parent SIP_TRANSFER, QgsLayout *layout, QPointF layoutPoint ) const = 0 SIP_FACTORY;
};
 
 
#ifndef SIP_RUN
 
 
class GUI_EXPORT QgsLayoutViewSnapMarker : public QGraphicsRectItem
{
  public:
 
    QgsLayoutViewSnapMarker();
 
    void paint( QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr ) override;
 
  private:
 
    int mSize = 0;
 
};
 
#endif
 
#endif // QGSLAYOUTVIEW_H