qwt_figure_widget_overlay.h

#ifndef QWTFIGUREWIDGETOVERLAY_H
#define QWTFIGUREWIDGETOVERLAY_H
#include "qwt_widget_overlay.h"
// Qt
class QEvent;
class QMouseEvent;
class QHoverEvent;
class QKeyEvent;
// Qwt
class QwtFigure;
class QwtPlot;
 
class QWT_EXPORT QwtFigureWidgetOverlay : public QwtWidgetOverlay
{
    Q_OBJECT
    QWT_DECLARE_PRIVATE(QwtFigureWidgetOverlay)
public:
    enum ControlType
    {
        ControlLineTop,
        ControlLineBottom,
        ControlLineLeft,
        ControlLineRight,
        ControlPointTopLeft,
        ControlPointTopRight,
        ControlPointBottomLeft,
        ControlPointBottomRight,
        Inner,
        OutSide
    };
    Q_ENUM(ControlType)
 
    
    enum BuiltInFunctionsFlag
    {
        FunSelectCurrentPlot = 1,  
        FunResizePlot        = 2   
    };
    Q_ENUM(BuiltInFunctionsFlag)
    Q_DECLARE_FLAGS(BuiltInFunctions, BuiltInFunctionsFlag)
    Q_FLAG(BuiltInFunctions)
 
public:
    // 构造函数不允许传入nullptr
    explicit QwtFigureWidgetOverlay(QwtFigure* fig);
    ~QwtFigureWidgetOverlay();
    QwtFigure* figure() const;
    void setTransparentForMouseEvents(bool on);
 
public:
    // 根据点和矩形的关系，返回图标的样式
    static Qt::CursorShape controlTypeToCursor(ControlType rr);
    static ControlType getPositionControlType(const QPoint& pos, const QRect& region, int err = 1);
    static bool isPointInRectEdget(const QPoint& pos, const QRect& region, int err = 1);
    // 设置内置功能的开关
    void setBuiltInFunctionsEnable(BuiltInFunctionsFlag flag, bool on = true);
    bool testBuiltInFunctions(BuiltInFunctionsFlag flag) const;
    // 判断当前是否有激活的窗口
    bool isHaveActiveWidget() const;
    // 设置边框的画笔
    void setBorderPen(const QPen& p);
    QPen borderPen() const;
    // 控制点的填充
    void setControlPointBrush(const QBrush& b);
    QBrush controlPointBrush() const;
    // 控制点尺寸
    void setControlPointSize(const QSize& c);
    QSize controlPointSize() const;
    // 选择下一个窗口作为激活窗体
    void selectNextWidget(bool forward = true);
    // 选择下一个绘图作为激活窗体
    void selectNextPlot(bool forward = true);
    // 获取当前激活的窗口
    QWidget* currentActiveWidget() const;
    QwtPlot* currentActivePlot() const;
    // 显示占比数值
    void showPercentText(bool on = true);
 
public Q_SLOTS:
    // 改变激活窗口
    void setActiveWidget(QWidget* w);
 
protected:
    virtual void drawOverlay(QPainter* p) const override;
    virtual QRegion maskHint() const override;
    //  绘制激活的窗口
    virtual void drawActiveWidget(QPainter* painter, QWidget* activeW) const;
    // 绘制resize变换的橡皮筋控制线
    virtual void drawResizeingControlLine(QPainter* painter, const QRectF& willSetNormRect) const;
    // 绘制控制线
    virtual void drawControlLine(QPainter* painter, const QRect& actualRect, const QRectF& normRect) const;
    // 辅助函数，标记开始改变尺寸
    void startResize(ControlType controlType, const QPoint& pos);
 
protected:
    void mouseMoveEvent(QMouseEvent* me) override;
    void mouseReleaseEvent(QMouseEvent* me) override;
    void mousePressEvent(QMouseEvent* me) override;
    void keyPressEvent(QKeyEvent* ke) override;
Q_SIGNALS:
 
    void widgetNormGeometryChanged(QWidget* w, const QRectF& oldNormGeo, const QRectF& newNormGeo);
    void activeWidgetChanged(QWidget* oldActive, QWidget* newActive);
 
private:
};
 
#endif  // QWTFIGUREWIDGETOVERLAY_H