qwt_picker.h

/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
 * 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
 *****************************************************************************/

#ifndef QWT_PICKER
#define QWT_PICKER 1

#include <qobject.h>
#include <qpen.h>
#include <qfont.h>
#include <qrect.h>
#include "qwt_global.h"
#include "qwt_text.h"
#include "qwt_polygon.h"
#include "qwt_event_pattern.h"

class QWidget;
class QMouseEvent;
class QWheelEvent;
class QKeyEvent;
class QwtPickerMachine;

class QWT_EXPORT QwtPicker: public QObject, public QwtEventPattern
{
    Q_OBJECT

    Q_ENUMS(RubberBand)
    Q_ENUMS(DisplayMode)
    Q_ENUMS(ResizeMode)

    Q_PROPERTY(int selectionFlags READ selectionFlags WRITE setSelectionFlags)
    Q_PROPERTY(DisplayMode trackerMode READ trackerMode WRITE setTrackerMode)
    Q_PROPERTY(QFont trackerFont READ trackerFont WRITE setTrackerFont)
    Q_PROPERTY(RubberBand rubberBand READ rubberBand WRITE setRubberBand)
    Q_PROPERTY(ResizeMode resizeMode READ resizeMode WRITE setResizeMode)
    Q_PROPERTY(bool isEnabled READ isEnabled WRITE setEnabled)

    Q_PROPERTY(QPen trackerPen READ trackerPen WRITE setTrackerPen)
    Q_PROPERTY(QPen rubberBandPen READ rubberBandPen WRITE setRubberBandPen)

public:
    enum SelectionType
    {
        NoSelection = 0,
        PointSelection = 1,
        RectSelection = 2,
        PolygonSelection = 4
    };

    enum RectSelectionType
    {
        CornerToCorner = 64,
        CenterToCorner = 128,
        CenterToRadius = 256
    };

    enum SelectionMode
    {
        ClickSelection = 1024,
        DragSelection = 2048
    };

    enum RubberBand
    {
        NoRubberBand = 0,

        // Point
        HLineRubberBand,
        VLineRubberBand,
        CrossRubberBand,

        // Rect
        RectRubberBand,
        EllipseRubberBand,

        // Polygon
        PolygonRubberBand,

        UserRubberBand = 100
    };

    enum DisplayMode
    {
        AlwaysOff,
        AlwaysOn,
        ActiveOnly
    };

    enum ResizeMode
    {
        Stretch,
        KeepSize
    };

    explicit QwtPicker(QWidget *parent);
    explicit QwtPicker(int selectionFlags, RubberBand rubberBand,
        DisplayMode trackerMode, QWidget *);

    virtual ~QwtPicker();

    virtual void setSelectionFlags(int);
    int selectionFlags() const;

    virtual void setRubberBand(RubberBand);
    RubberBand rubberBand() const;

    virtual void setTrackerMode(DisplayMode);
    DisplayMode trackerMode() const;

    virtual void setResizeMode(ResizeMode);
    ResizeMode resizeMode() const;

    virtual void setRubberBandPen(const QPen &);
    QPen rubberBandPen() const;

    virtual void setTrackerPen(const QPen &);
    QPen trackerPen() const;

    virtual void setTrackerFont(const QFont &);
    QFont trackerFont() const;

    bool isEnabled() const;
    virtual void setEnabled(bool);

    bool isActive() const;

    virtual bool eventFilter(QObject *, QEvent *);

    QWidget *parentWidget();
    const QWidget *parentWidget() const;

    virtual QRect pickRect() const;
    const QwtPolygon &selection() const; 

    virtual void drawRubberBand(QPainter *) const;
    virtual void drawTracker(QPainter *) const;

signals:
    void selected(const QwtPolygon &pa);

    void appended(const QPoint &pos);

    void moved(const QPoint &pos);

    void changed(const QwtPolygon &pa);

protected:
    virtual bool accept(QwtPolygon &selection) const;

    virtual void transition(const QEvent *);

    virtual void begin();
    virtual void append(const QPoint &);
    virtual void move(const QPoint &);
    virtual bool end(bool ok = true);

    virtual void widgetMousePressEvent(QMouseEvent *);
    virtual void widgetMouseReleaseEvent(QMouseEvent *);
    virtual void widgetMouseDoubleClickEvent(QMouseEvent *); 
    virtual void widgetMouseMoveEvent(QMouseEvent *); 
    virtual void widgetWheelEvent(QWheelEvent *);
    virtual void widgetKeyPressEvent(QKeyEvent *); 
    virtual void widgetKeyReleaseEvent(QKeyEvent *); 
    virtual void widgetLeaveEvent(QEvent *); 

    QRect trackerRect(QPainter *painter) const;

    virtual void stretchSelection(const QSize &oldSize, 
        const QSize &newSize);

    virtual QwtText trackerText(const QPoint &pos) const;

    virtual QwtPickerMachine *stateMachine(int) const;

    virtual void updateDisplay();

    const QWidget *rubberBandWidget() const;
    const QWidget *trackerWidget() const;

private:
    void init(QWidget *, int selectionFlags, RubberBand rubberBand,
        DisplayMode trackerMode);

    void setStateMachine(QwtPickerMachine *);
    void setMouseTracking(bool);

    class PrivateData;
    PrivateData *d_data;
};
            
#endif

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