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examples/realtime/ScrollZoomer.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 <QwtPlotZoomer>
+#include <QwtPlot>
+
+class ScrollData;
+class ScrollBar;
+
+class ScrollZoomer : public QwtPlotZoomer
+{
+    Q_OBJECT
+  public:
+    enum ScrollBarPosition
+    {
+        AttachedToScale,
+        OppositeToScale
+    };
+
+    ScrollZoomer( QWidget* );
+    virtual ~ScrollZoomer();
+
+    ScrollBar* horizontalScrollBar() const;
+    ScrollBar* verticalScrollBar() const;
+
+    void setHScrollBarMode( Qt::ScrollBarPolicy );
+    void setVScrollBarMode( Qt::ScrollBarPolicy );
+
+    Qt::ScrollBarPolicy vScrollBarMode () const;
+    Qt::ScrollBarPolicy hScrollBarMode () const;
+
+    void setHScrollBarPosition( ScrollBarPosition );
+    void setVScrollBarPosition( ScrollBarPosition );
+
+    ScrollBarPosition hScrollBarPosition() const;
+    ScrollBarPosition vScrollBarPosition() const;
+
+    QWidget* cornerWidget() const;
+    virtual void setCornerWidget( QWidget* );
+
+    virtual bool eventFilter( QObject*, QEvent* ) QWT_OVERRIDE;
+
+    virtual void rescale() QWT_OVERRIDE;
+
+  protected:
+    virtual ScrollBar* scrollBar( Qt::Orientation );
+    virtual void updateScrollBars();
+    virtual void layoutScrollBars( const QRect& );
+
+  private Q_SLOTS:
+    void scrollBarMoved( Qt::Orientation o, double min, double max );
+
+  private:
+    bool needScrollBar( Qt::Orientation ) const;
+    int oppositeAxis( int ) const;
+
+    QWidget* m_cornerWidget;
+
+    ScrollData* m_hScrollData;
+    ScrollData* m_vScrollData;
+
+    bool m_inZoom;
+    bool m_alignCanvasToScales[ QwtAxis::AxisPositions ];
+};