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examples/itemeditor/Editor.h

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+/*****************************************************************************
+ * Qwt Examples - Copyright (C) 2002 Uwe Rathmann
+ * This file may be used under the terms of the 3-clause BSD License
+ *****************************************************************************/
+
+#pragma once
+
+#include <QwtGlobal>
+
+#include <QObject>
+#include <QPointer>
+#include <QPoint>
+
+class QwtPlot;
+class QwtPlotShapeItem;
+class QwtWidgetOverlay;
+
+class QPainter;
+class QRegion;
+
+class Editor : public QObject
+{
+    Q_OBJECT
+
+  public:
+    enum Mode
+    {
+        NoMask,
+        Mask,
+        AlphaMask,
+        AlphaMaskRedraw,
+        AlphaMaskCopyMask
+    };
+
+    Editor( QwtPlot* );
+    virtual ~Editor();
+
+    const QwtPlot* plot() const;
+    QwtPlot* plot();
+
+    virtual void setEnabled( bool on );
+    bool isEnabled() const;
+
+    void drawOverlay( QPainter* ) const;
+    QRegion maskHint() const;
+
+    virtual bool eventFilter( QObject*, QEvent*) QWT_OVERRIDE;
+
+    void setMode( Mode mode );
+    Mode mode() const;
+
+  private:
+    bool pressed( const QPoint& );
+    bool moved( const QPoint& );
+    void released( const QPoint& );
+
+    QwtPlotShapeItem* itemAt( const QPoint& ) const;
+    void raiseItem( QwtPlotShapeItem* );
+
+    QRegion maskHint( QwtPlotShapeItem* ) const;
+    void setItemVisible( QwtPlotShapeItem*, bool on );
+
+    bool m_isEnabled;
+    QPointer< QwtWidgetOverlay > m_overlay;
+
+    // Mouse positions
+    QPointF m_currentPos;
+    QwtPlotShapeItem* m_editedItem;
+
+    Mode m_mode;
+};