333 lines
9.3 KiB
C
333 lines
9.3 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_PICKER
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#define QWT_PICKER 1
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#include "qwt_global.h"
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#include "qwt_text.h"
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#include "qwt_event_pattern.h"
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#include <qobject.h>
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#include <qpen.h>
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#include <qfont.h>
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#include <qrect.h>
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#include <qpainterpath.h>
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class QWidget;
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class QMouseEvent;
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class QWheelEvent;
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class QKeyEvent;
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class QwtPickerMachine;
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class QwtWidgetOverlay;
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/*!
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\brief QwtPicker provides selections on a widget
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QwtPicker filters all enter, leave, mouse and keyboard events of a widget
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and translates them into an array of selected points.
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The way how the points are collected depends on type of state machine
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that is connected to the picker. Qwt offers a couple of predefined
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state machines for selecting:
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- Nothing\n
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QwtPickerTrackerMachine
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- Single points\n
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QwtPickerClickPointMachine, QwtPickerDragPointMachine
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- Rectangles\n
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QwtPickerClickRectMachine, QwtPickerDragRectMachine
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- Polygons\n
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QwtPickerPolygonMachine
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While these state machines cover the most common ways to collect points
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it is also possible to implement individual machines as well.
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QwtPicker translates the picked points into a selection using the
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adjustedPoints() method. adjustedPoints() is intended to be reimplemented
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to fix up the selection according to application specific requirements.
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(F.e. when an application accepts rectangles of a fixed aspect ratio only.)
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Optionally QwtPicker support the process of collecting points by a
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rubber band and tracker displaying a text for the current mouse
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position.
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\par Example
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\code
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#include <qwt_picker.h>
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#include <qwt_picker_machine.h>
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QwtPicker *picker = new QwtPicker(widget);
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picker->setStateMachine(new QwtPickerDragRectMachine);
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picker->setTrackerMode(QwtPicker::ActiveOnly);
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picker->setRubberBand(QwtPicker::RectRubberBand);
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\endcode
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\endpar
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The state machine triggers the following commands:
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- begin()\n
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Activate/Initialize the selection.
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- append()\n
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Add a new point
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- move() \n
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Change the position of the last point.
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- remove()\n
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Remove the last point.
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- end()\n
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Terminate the selection and call accept to validate the picked points.
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The picker is active (isActive()), between begin() and end().
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In active state the rubber band is displayed, and the tracker is visible
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in case of trackerMode is ActiveOnly or AlwaysOn.
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The cursor can be moved using the arrow keys. All selections can be aborted
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using the abort key. (QwtEventPattern::KeyPatternCode)
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\warning In case of QWidget::NoFocus the focus policy of the observed
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widget is set to QWidget::WheelFocus and mouse tracking
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will be manipulated while the picker is active,
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or if trackerMode() is AlwayOn.
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*/
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class QWT_EXPORT QwtPicker: public QObject, public QwtEventPattern
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{
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Q_OBJECT
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Q_ENUMS( RubberBand DisplayMode ResizeMode )
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Q_PROPERTY( bool isEnabled READ isEnabled WRITE setEnabled )
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Q_PROPERTY( ResizeMode resizeMode READ resizeMode WRITE setResizeMode )
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Q_PROPERTY( DisplayMode trackerMode READ trackerMode WRITE setTrackerMode )
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Q_PROPERTY( QPen trackerPen READ trackerPen WRITE setTrackerPen )
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Q_PROPERTY( QFont trackerFont READ trackerFont WRITE setTrackerFont )
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Q_PROPERTY( RubberBand rubberBand READ rubberBand WRITE setRubberBand )
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Q_PROPERTY( QPen rubberBandPen READ rubberBandPen WRITE setRubberBandPen )
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public:
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/*!
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Rubber band style
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The default value is QwtPicker::NoRubberBand.
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\sa setRubberBand(), rubberBand()
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*/
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enum RubberBand
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{
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//! No rubberband.
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NoRubberBand = 0,
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//! A horizontal line ( only for QwtPickerMachine::PointSelection )
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HLineRubberBand,
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//! A vertical line ( only for QwtPickerMachine::PointSelection )
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VLineRubberBand,
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//! A crosshair ( only for QwtPickerMachine::PointSelection )
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CrossRubberBand,
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//! A rectangle ( only for QwtPickerMachine::RectSelection )
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RectRubberBand,
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//! An ellipse ( only for QwtPickerMachine::RectSelection )
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EllipseRubberBand,
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//! A polygon ( only for QwtPickerMachine::PolygonSelection )
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PolygonRubberBand,
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/*!
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Values >= UserRubberBand can be used to define additional
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rubber bands.
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*/
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UserRubberBand = 100
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};
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/*!
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\brief Display mode
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\sa setTrackerMode(), trackerMode(), isActive()
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*/
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enum DisplayMode
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{
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//! Display never
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AlwaysOff,
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//! Display always
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AlwaysOn,
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//! Display only when the selection is active
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ActiveOnly
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};
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/*!
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Controls what to do with the selected points of an active
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selection when the observed widget is resized.
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The default value is QwtPicker::Stretch.
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\sa setResizeMode()
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*/
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enum ResizeMode
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{
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//! All points are scaled according to the new size,
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Stretch,
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//! All points remain unchanged.
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KeepSize
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};
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explicit QwtPicker( QWidget *parent );
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explicit QwtPicker( RubberBand rubberBand,
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DisplayMode trackerMode, QWidget * );
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virtual ~QwtPicker();
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void setStateMachine( QwtPickerMachine * );
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const QwtPickerMachine *stateMachine() const;
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QwtPickerMachine *stateMachine();
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void setRubberBand( RubberBand );
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RubberBand rubberBand() const;
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void setTrackerMode( DisplayMode );
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DisplayMode trackerMode() const;
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void setResizeMode( ResizeMode );
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ResizeMode resizeMode() const;
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void setRubberBandPen( const QPen & );
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QPen rubberBandPen() const;
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void setTrackerPen( const QPen & );
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QPen trackerPen() const;
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void setTrackerFont( const QFont & );
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QFont trackerFont() const;
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bool isEnabled() const;
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bool isActive() const;
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virtual bool eventFilter( QObject *, QEvent * );
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QWidget *parentWidget();
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const QWidget *parentWidget() const;
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virtual QPainterPath pickArea() const;
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virtual void drawRubberBand( QPainter * ) const;
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virtual void drawTracker( QPainter * ) const;
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virtual QRegion rubberBandMask() const;
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virtual QwtText trackerText( const QPoint &pos ) const;
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QPoint trackerPosition() const;
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virtual QRect trackerRect( const QFont & ) const;
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QPolygon selection() const;
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public Q_SLOTS:
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void setEnabled( bool );
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Q_SIGNALS:
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/*!
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A signal indicating, when the picker has been activated.
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Together with setEnabled() it can be used to implement
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selections with more than one picker.
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\param on True, when the picker has been activated
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*/
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void activated( bool on );
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/*!
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A signal emitting the selected points,
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at the end of a selection.
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\param polygon Selected points
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*/
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void selected( const QPolygon &polygon );
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/*!
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A signal emitted when a point has been appended to the selection
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\param pos Position of the appended point.
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\sa append(). moved()
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*/
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void appended( const QPoint &pos );
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/*!
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A signal emitted whenever the last appended point of the
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selection has been moved.
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\param pos Position of the moved last point of the selection.
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\sa move(), appended()
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*/
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void moved( const QPoint &pos );
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/*!
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A signal emitted whenever the last appended point of the
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selection has been removed.
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\param pos Position of the point, that has been removed
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\sa remove(), appended()
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*/
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void removed( const QPoint &pos );
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/*!
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A signal emitted when the active selection has been changed.
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This might happen when the observed widget is resized.
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\param selection Changed selection
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\sa stretchSelection()
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*/
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void changed( const QPolygon &selection );
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protected:
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virtual QPolygon adjustedPoints( const QPolygon & ) const;
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virtual void transition( const QEvent * );
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virtual void begin();
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virtual void append( const QPoint & );
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virtual void move( const QPoint & );
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virtual void remove();
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virtual bool end( bool ok = true );
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virtual bool accept( QPolygon & ) const;
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virtual void reset();
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virtual void widgetMousePressEvent( QMouseEvent * );
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virtual void widgetMouseReleaseEvent( QMouseEvent * );
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virtual void widgetMouseDoubleClickEvent( QMouseEvent * );
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virtual void widgetMouseMoveEvent( QMouseEvent * );
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virtual void widgetWheelEvent( QWheelEvent * );
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virtual void widgetKeyPressEvent( QKeyEvent * );
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virtual void widgetKeyReleaseEvent( QKeyEvent * );
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virtual void widgetEnterEvent( QEvent * );
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virtual void widgetLeaveEvent( QEvent * );
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virtual void stretchSelection(
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const QSize &oldSize, const QSize &newSize );
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virtual void updateDisplay();
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const QwtWidgetOverlay *rubberBandOverlay() const;
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const QwtWidgetOverlay *trackerOverlay() const;
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const QPolygon &pickedPoints() const;
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private:
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void init( QWidget *, RubberBand rubberBand, DisplayMode trackerMode );
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void setMouseTracking( bool );
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class PrivateData;
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PrivateData *d_data;
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};
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#endif
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