qwt_cache_panner.h

/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *
 * Modified by ChenZongYan in 2024 <czy.t@163.com>
 *   Summary of major modifications (see ChangeLog.md for full history):
 *   1. CMake build system & C++11 throughout.
 *   2. Core panner/ zoomer refactored:
 *        - QwtPanner → QwtCachePanner (pixmap-cache version)
 *        - New real-time QwtPlotPanner derived from QwtPicker.
 *   3. Zoomer supports multi-axis.
 *   4. Parasite-plot framework:
 *        - QwtFigure, QwtPlotParasiteLayout, QwtPlotTransparentCanvas,
 *        - QwtPlotScaleEventDispatcher, built-in pan/zoom on axis.
 *   5. New picker: QwtPlotSeriesDataPicker (works with date axis).
 *   6. Raster & color-map extensions:
 *        - QwtGridRasterData (2-D table + interpolation)
 *        - QwtLinearColorMap::stopColors(), stopPos() API rename.
 *   7. Bar-chart: expose pen/brush control.
 *   8. Amalgamated build: single QwtPlot.h / QwtPlot.cpp pair in src-amalgamate.
 *****************************************************************************/
 
#ifndef QWT_CACHE_PANNER_H
#define QWT_CACHE_PANNER_H
 
#include "qwt_global.h"
#include <qwidget.h>
 
class QCursor;
class QPixmap;
 
class QWT_EXPORT QwtCachePanner : public QWidget
{
    Q_OBJECT
 
public:
    // Constructor with parent widget
    explicit QwtCachePanner(QWidget* parent);
    // Destructor
    virtual ~QwtCachePanner();
 
    // Enable or disable the panner
    void setEnabled(bool);
    // Return whether the panner is enabled
    bool isEnabled() const;
 
    // Set the mouse button and modifiers for panning
    void setMouseButton(Qt::MouseButton, Qt::KeyboardModifiers = Qt::NoModifier);
    // Get the mouse button and modifiers used for panning
    void getMouseButton(Qt::MouseButton& button, Qt::KeyboardModifiers&) const;
 
    // Set the abort key and modifiers
    void setAbortKey(int key, Qt::KeyboardModifiers = Qt::NoModifier);
    // Get the abort key and modifiers
    void getAbortKey(int& key, Qt::KeyboardModifiers&) const;
 
    // Set the cursor active while panning
    void setCursor(const QCursor&);
    // Return the cursor active while panning
    const QCursor cursor() const;
 
    // Set orientations where panning is enabled
    void setOrientations(Qt::Orientations);
    // Return orientations where panning is enabled
    Qt::Orientations orientations() const;
 
    // Check if an orientation is enabled for panning
    bool isOrientationEnabled(Qt::Orientation) const;
 
    // Event filter for the parent widget
    virtual bool eventFilter(QObject*, QEvent*) override;
 
Q_SIGNALS:
    void panned(int dx, int dy);
 
    void moved(int dx, int dy);
 
protected:
    virtual void widgetMousePressEvent(QMouseEvent*);
    virtual void widgetMouseReleaseEvent(QMouseEvent*);
    virtual void widgetMouseMoveEvent(QMouseEvent*);
    virtual void widgetKeyPressEvent(QKeyEvent*);
    virtual void widgetKeyReleaseEvent(QKeyEvent*);
 
    virtual void paintEvent(QPaintEvent*) override;
 
    virtual QBitmap contentsMask() const;
    virtual QPixmap grab() const;
 
private:
#ifndef QT_NO_CURSOR
    void showCursor(bool);
#endif
 
    class PrivateData;
    PrivateData* m_data;
};
 
#endif