334 lines
8.1 KiB
C++
334 lines
8.1 KiB
C++
/* -*- 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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#include "qwt_arrow_button.h"
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#include "qwt_math.h"
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#include <qpainter.h>
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#include <qstyle.h>
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#include <qstyleoption.h>
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#include <qevent.h>
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#include <qapplication.h>
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static const int MaxNum = 3;
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static const int Margin = 2;
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static const int Spacing = 1;
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class QwtArrowButton::PrivateData
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{
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public:
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int num;
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Qt::ArrowType arrowType;
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};
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static QStyleOptionButton styleOpt( const QwtArrowButton* btn )
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{
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QStyleOptionButton option;
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option.init( btn );
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option.features = QStyleOptionButton::None;
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if ( btn->isFlat() )
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option.features |= QStyleOptionButton::Flat;
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if ( btn->menu() )
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option.features |= QStyleOptionButton::HasMenu;
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if ( btn->autoDefault() || btn->isDefault() )
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option.features |= QStyleOptionButton::AutoDefaultButton;
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if ( btn->isDefault() )
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option.features |= QStyleOptionButton::DefaultButton;
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if ( btn->isDown() )
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option.state |= QStyle::State_Sunken;
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if ( !btn->isFlat() && !btn->isDown() )
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option.state |= QStyle::State_Raised;
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return option;
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}
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/*!
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\param num Number of arrows
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\param arrowType see Qt::ArrowType in the Qt docs.
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\param parent Parent widget
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*/
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QwtArrowButton::QwtArrowButton( int num,
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Qt::ArrowType arrowType, QWidget *parent ):
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QPushButton( parent )
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{
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d_data = new PrivateData;
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d_data->num = qBound( 1, num, MaxNum );
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d_data->arrowType = arrowType;
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setAutoRepeat( true );
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setAutoDefault( false );
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switch ( d_data->arrowType )
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{
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case Qt::LeftArrow:
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case Qt::RightArrow:
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setSizePolicy( QSizePolicy::Expanding,
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QSizePolicy::Fixed );
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break;
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default:
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setSizePolicy( QSizePolicy::Fixed,
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QSizePolicy::Expanding );
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}
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}
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//! Destructor
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QwtArrowButton::~QwtArrowButton()
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{
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delete d_data;
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d_data = NULL;
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}
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/*!
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\brief The direction of the arrows
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*/
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Qt::ArrowType QwtArrowButton::arrowType() const
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{
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return d_data->arrowType;
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}
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/*!
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\brief The number of arrows
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*/
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int QwtArrowButton::num() const
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{
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return d_data->num;
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}
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/*!
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\return the bounding rectangle for the label
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*/
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QRect QwtArrowButton::labelRect() const
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{
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const int m = Margin;
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QRect r = rect();
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r.setRect( r.x() + m, r.y() + m,
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r.width() - 2 * m, r.height() - 2 * m );
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if ( isDown() )
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{
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QStyleOptionButton option = styleOpt( this );
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const int ph = style()->pixelMetric(
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QStyle::PM_ButtonShiftHorizontal, &option, this );
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const int pv = style()->pixelMetric(
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QStyle::PM_ButtonShiftVertical, &option, this );
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r.translate( ph, pv );
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}
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return r;
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}
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/*!
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Paint event handler
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\param event Paint event
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*/
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void QwtArrowButton::paintEvent( QPaintEvent *event )
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{
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QPushButton::paintEvent( event );
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QPainter painter( this );
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drawButtonLabel( &painter );
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}
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/*!
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\brief Draw the button label
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\param painter Painter
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\sa The Qt Manual for QPushButton
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*/
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void QwtArrowButton::drawButtonLabel( QPainter *painter )
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{
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const bool isVertical = d_data->arrowType == Qt::UpArrow ||
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d_data->arrowType == Qt::DownArrow;
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const QRect r = labelRect();
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QSize boundingSize = labelRect().size();
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if ( isVertical )
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boundingSize.transpose();
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const int w =
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( boundingSize.width() - ( MaxNum - 1 ) * Spacing ) / MaxNum;
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QSize arrow = arrowSize( Qt::RightArrow,
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QSize( w, boundingSize.height() ) );
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if ( isVertical )
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arrow.transpose();
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QRect contentsSize; // aligned rect where to paint all arrows
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if ( d_data->arrowType == Qt::LeftArrow || d_data->arrowType == Qt::RightArrow )
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{
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contentsSize.setWidth( d_data->num * arrow.width()
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+ ( d_data->num - 1 ) * Spacing );
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contentsSize.setHeight( arrow.height() );
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}
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else
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{
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contentsSize.setWidth( arrow.width() );
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contentsSize.setHeight( d_data->num * arrow.height()
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+ ( d_data->num - 1 ) * Spacing );
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}
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QRect arrowRect( contentsSize );
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arrowRect.moveCenter( r.center() );
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arrowRect.setSize( arrow );
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painter->save();
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for ( int i = 0; i < d_data->num; i++ )
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{
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drawArrow( painter, arrowRect, d_data->arrowType );
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int dx = 0;
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int dy = 0;
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if ( isVertical )
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dy = arrow.height() + Spacing;
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else
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dx = arrow.width() + Spacing;
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arrowRect.translate( dx, dy );
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}
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painter->restore();
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if ( hasFocus() )
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{
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QStyleOptionFocusRect option;
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option.init( this );
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option.backgroundColor = palette().color( QPalette::Window );
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style()->drawPrimitive( QStyle::PE_FrameFocusRect,
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&option, painter, this );
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}
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}
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/*!
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Draw an arrow int a bounding rectangle
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\param painter Painter
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\param r Rectangle where to paint the arrow
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\param arrowType Arrow type
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*/
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void QwtArrowButton::drawArrow( QPainter *painter,
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const QRect &r, Qt::ArrowType arrowType ) const
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{
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QPolygon pa( 3 );
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switch ( arrowType )
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{
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case Qt::UpArrow:
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pa.setPoint( 0, r.bottomLeft() );
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pa.setPoint( 1, r.bottomRight() );
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pa.setPoint( 2, r.center().x(), r.top() );
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break;
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case Qt::DownArrow:
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pa.setPoint( 0, r.topLeft() );
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pa.setPoint( 1, r.topRight() );
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pa.setPoint( 2, r.center().x(), r.bottom() );
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break;
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case Qt::RightArrow:
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pa.setPoint( 0, r.topLeft() );
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pa.setPoint( 1, r.bottomLeft() );
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pa.setPoint( 2, r.right(), r.center().y() );
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break;
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case Qt::LeftArrow:
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pa.setPoint( 0, r.topRight() );
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pa.setPoint( 1, r.bottomRight() );
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pa.setPoint( 2, r.left(), r.center().y() );
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break;
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default:
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break;
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}
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painter->save();
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painter->setRenderHint( QPainter::Antialiasing, true );
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painter->setPen( Qt::NoPen );
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painter->setBrush( palette().brush( QPalette::ButtonText ) );
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painter->drawPolygon( pa );
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painter->restore();
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}
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/*!
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\return a size hint
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*/
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QSize QwtArrowButton::sizeHint() const
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{
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const QSize hint = minimumSizeHint();
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return hint.expandedTo( QApplication::globalStrut() );
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}
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/*!
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\brief Return a minimum size hint
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*/
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QSize QwtArrowButton::minimumSizeHint() const
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{
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const QSize asz = arrowSize( Qt::RightArrow, QSize() );
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QSize sz(
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2 * Margin + ( MaxNum - 1 ) * Spacing + MaxNum * asz.width(),
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2 * Margin + asz.height()
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);
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if ( d_data->arrowType == Qt::UpArrow || d_data->arrowType == Qt::DownArrow )
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sz.transpose();
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QStyleOption styleOption;
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styleOption.init( this );
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sz = style()->sizeFromContents( QStyle::CT_PushButton,
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&styleOption, sz, this );
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return sz;
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}
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/*!
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Calculate the size for a arrow that fits into a rectangle of a given size
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\param arrowType Arrow type
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\param boundingSize Bounding size
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\return Size of the arrow
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*/
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QSize QwtArrowButton::arrowSize( Qt::ArrowType arrowType,
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const QSize &boundingSize ) const
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{
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QSize bs = boundingSize;
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if ( arrowType == Qt::UpArrow || arrowType == Qt::DownArrow )
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bs.transpose();
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const int MinLen = 2;
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const QSize sz = bs.expandedTo(
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QSize( MinLen, 2 * MinLen - 1 ) ); // minimum
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int w = sz.width();
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int h = 2 * w - 1;
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if ( h > sz.height() )
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{
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h = sz.height();
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w = ( h + 1 ) / 2;
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}
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QSize arrSize( w, h );
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if ( arrowType == Qt::UpArrow || arrowType == Qt::DownArrow )
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arrSize.transpose();
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return arrSize;
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}
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/*!
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\brief autoRepeat for the space keys
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*/
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void QwtArrowButton::keyPressEvent( QKeyEvent *event )
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{
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if ( event->isAutoRepeat() && event->key() == Qt::Key_Space )
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Q_EMIT clicked();
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QPushButton::keyPressEvent( event );
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}
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