168 lines
4.3 KiB
C
168 lines
4.3 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_ABSTRACT_SLIDER_H
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#define QWT_ABSTRACT_SLIDER_H
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#include "qwt_global.h"
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#include "qwt_abstract_scale.h"
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/*!
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\brief An abstract base class for slider widgets with a scale
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A slider widget displays a value according to a scale.
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The class is designed as a common super class for widgets like
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QwtKnob, QwtDial and QwtSlider.
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When the slider is nor readOnly() its value can be modified
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by keyboard, mouse and wheel inputs.
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The range of the slider is divided into a number of steps from
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which the value increments according to user inputs depend.
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Only for linear scales the number of steps correspond with
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a fixed step size.
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*/
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class QWT_EXPORT QwtAbstractSlider: public QwtAbstractScale
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{
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Q_OBJECT
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Q_PROPERTY( double value READ value WRITE setValue )
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Q_PROPERTY( uint totalSteps READ totalSteps WRITE setTotalSteps )
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Q_PROPERTY( uint singleSteps READ singleSteps WRITE setSingleSteps )
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Q_PROPERTY( uint pageSteps READ pageSteps WRITE setPageSteps )
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Q_PROPERTY( bool stepAlignment READ stepAlignment WRITE setStepAlignment )
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Q_PROPERTY( bool readOnly READ isReadOnly WRITE setReadOnly )
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Q_PROPERTY( bool tracking READ isTracking WRITE setTracking )
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Q_PROPERTY( bool wrapping READ wrapping WRITE setWrapping )
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Q_PROPERTY( bool invertedControls READ invertedControls WRITE setInvertedControls )
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public:
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explicit QwtAbstractSlider( QWidget *parent = NULL );
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virtual ~QwtAbstractSlider();
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void setValid( bool );
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bool isValid() const;
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double value() const;
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void setWrapping( bool );
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bool wrapping() const;
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void setTotalSteps( uint );
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uint totalSteps() const;
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void setSingleSteps( uint );
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uint singleSteps() const;
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void setPageSteps( uint );
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uint pageSteps() const;
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void setStepAlignment( bool );
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bool stepAlignment() const;
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void setTracking( bool );
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bool isTracking() const;
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void setReadOnly( bool );
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bool isReadOnly() const;
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void setInvertedControls( bool );
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bool invertedControls() const;
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public Q_SLOTS:
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void setValue( double value );
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Q_SIGNALS:
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/*!
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\brief Notify a change of value.
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When tracking is enabled (default setting),
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this signal will be emitted every time the value changes.
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\param value New value
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\sa setTracking(), sliderMoved()
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*/
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void valueChanged( double value );
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/*!
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This signal is emitted when the user presses the
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movable part of the slider.
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*/
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void sliderPressed();
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/*!
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This signal is emitted when the user releases the
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movable part of the slider.
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*/
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void sliderReleased();
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/*!
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This signal is emitted when the user moves the
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slider with the mouse.
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\param value New value
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\sa valueChanged()
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*/
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void sliderMoved( double value );
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protected:
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virtual void mousePressEvent( QMouseEvent * );
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virtual void mouseReleaseEvent( QMouseEvent * );
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virtual void mouseMoveEvent( QMouseEvent * );
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virtual void keyPressEvent( QKeyEvent * );
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virtual void wheelEvent( QWheelEvent * );
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/*!
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\brief Determine what to do when the user presses a mouse button.
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\param pos Mouse position
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\retval True, when pos is a valid scroll position
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\sa scrolledTo()
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*/
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virtual bool isScrollPosition( const QPoint &pos ) const = 0;
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/*!
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\brief Determine the value for a new position of the
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movable part of the slider
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\param pos Mouse position
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\return Value for the mouse position
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\sa isScrollPosition()
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*/
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virtual double scrolledTo( const QPoint &pos ) const = 0;
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void incrementValue( int stepCount );
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virtual void scaleChange();
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protected:
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virtual void sliderChange();
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double incrementedValue(
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double value, int stepCount ) const;
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private:
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double alignedValue( double ) const;
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double boundedValue( double ) const;
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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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