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302 lines
6.6 KiB
302 lines
6.6 KiB
/****************************************************************************
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**
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** Definition of TQThumbWheel class
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**
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** Created : 010205
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of the widgets module of the TQt GUI Toolkit.
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**
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** This file may be used under the terms of the GNU General
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** Public License versions 2.0 or 3.0 as published by the Free
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** Software Foundation and appearing in the files LICENSE.GPL2
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** and LICENSE.GPL3 included in the packaging of this file.
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** Alternatively you may (at your option) use any later version
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** of the GNU General Public License if such license has been
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** publicly approved by Trolltech ASA (or its successors, if any)
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** and the KDE Free TQt Foundation.
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**
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** Please review the following information to ensure GNU General
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** Public Licensing requirements will be met:
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** http://trolltech.com/products/qt/licenses/licensing/opensource/.
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** If you are unsure which license is appropriate for your use, please
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** review the following information:
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** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
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** or contact the sales department at sales@trolltech.com.
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**
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** This file may be used under the terms of the Q Public License as
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** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
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** included in the packaging of this file. Licensees holding valid TQt
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** Commercial licenses may use this file in accordance with the TQt
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** Commercial License Agreement provided with the Software.
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**
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
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** herein.
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**
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**********************************************************************/
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#include "qthumbwheel.h"
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#ifndef TQT_NO_THUMBWHEEL
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#include <ntqpainter.h>
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#include <ntqdrawutil.h>
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#include <ntqpixmap.h>
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#include <math.h>
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static const double m_pi = 3.14159265358979323846;
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static const double rad_factor = 180.0 / m_pi;
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TQThumbWheel::TQThumbWheel( TQWidget *parent, const char *name )
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: TQFrame( parent, name )
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{
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orient = Vertical;
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init();
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}
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/*!
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Destructs the wheel.
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*/
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TQThumbWheel::~TQThumbWheel()
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{
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}
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/*!
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\internal
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*/
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void TQThumbWheel::init()
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{
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track = TRUE;
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mousePressed = FALSE;
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pressedAt = -1;
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rat = 1.0;
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setFrameStyle( WinPanel | Sunken );
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setMargin( 2 );
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setFocusPolicy( WheelFocus );
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}
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void TQThumbWheel::setOrientation( Orientation orientation )
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{
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orient = orientation;
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update();
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}
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void TQThumbWheel::setTracking( bool enable )
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{
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track = enable;
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}
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void TQThumbWheel::setTransmissionRatio( double r )
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{
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rat = r;
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}
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/*!
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Makes TQRangeControl::setValue() available as a slot.
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*/
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void TQThumbWheel::setValue( int value )
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{
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TQRangeControl::setValue( value );
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}
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void TQThumbWheel::valueChange()
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{
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repaint( FALSE );
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emit valueChanged(value());
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}
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void TQThumbWheel::rangeChange()
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{
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}
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void TQThumbWheel::stepChange()
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{
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}
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/*!
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\reimp
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*/
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void TQThumbWheel::keyPressEvent( TQKeyEvent *e )
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{
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switch ( e->key() ) {
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case Key_Left:
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if ( orient == Horizontal )
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subtractLine();
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break;
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case Key_Right:
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if ( orient == Horizontal )
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addLine();
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break;
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case Key_Up:
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if ( orient == Vertical )
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subtractLine();
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break;
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case Key_Down:
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if ( orient == Vertical )
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addLine();
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break;
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case Key_PageUp:
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subtractPage();
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break;
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case Key_PageDown:
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addPage();
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break;
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case Key_Home:
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setValue( minValue() );
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break;
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case Key_End:
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setValue( maxValue() );
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break;
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default:
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e->ignore();
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return;
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};
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}
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/*!
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\reimp
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*/
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void TQThumbWheel::mousePressEvent( TQMouseEvent *e )
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{
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if ( e->button() == LeftButton ) {
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mousePressed = TRUE;
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pressedAt = valueFromPosition( e->pos() );
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}
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}
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/*!
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\reimp
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*/
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void TQThumbWheel::mouseReleaseEvent( TQMouseEvent *e )
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{
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int movedTo = valueFromPosition( e->pos() );
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setValue( value() + movedTo - pressedAt );
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pressedAt = movedTo;
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}
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/*!
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\reimp
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*/
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void TQThumbWheel::mouseMoveEvent( TQMouseEvent *e )
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{
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if ( !mousePressed )
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return;
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if ( track ) {
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int movedTo = valueFromPosition( e->pos() );
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setValue( value() + movedTo - pressedAt );
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pressedAt = movedTo;
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}
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}
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/*!
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\reimp
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*/
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void TQThumbWheel::wheelEvent( TQWheelEvent *e )
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{
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int step = ( e->state() & ControlButton ) ? lineStep() : pageStep();
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setValue( value() - e->delta()*step/120 );
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e->accept();
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}
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/*!\reimp
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*/
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void TQThumbWheel::focusInEvent( TQFocusEvent *e )
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{
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TQWidget::focusInEvent( e );
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}
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/*!\reimp
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*/
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void TQThumbWheel::focusOutEvent( TQFocusEvent *e )
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{
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TQWidget::focusOutEvent( e );
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}
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void TQThumbWheel::drawContents( TQPainter *p )
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{
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TQRect cr = contentsRect();
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// double buffer
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TQPixmap pix( width(), height() );
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TQPainter pt( &pix );
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TQBrush brush = backgroundPixmap() ?
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TQBrush( backgroundColor(), *backgroundPixmap() ) : TQBrush( backgroundColor() );
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pt.fillRect( cr, brush );
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const int n = 17;
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const double delta = m_pi / double(n);
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// ### use positionFromValue() with rad*16 or similar
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double alpha = 2*m_pi*double(value()-minValue())/
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double(maxValue()-minValue())*transmissionRatio();
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alpha = fmod(alpha, delta);
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TQPen pen0( colorGroup().midlight() );
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TQPen pen1( colorGroup().dark() );
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if ( orient == Horizontal ) {
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double r = 0.5*cr.width();
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int y0 = cr.y()+1;
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int y1 = cr.bottom()-1;
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for ( int i = 0; i < n; i++ ) {
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int x = cr.x() + int((1-cos(delta*double(i)+alpha))*r);
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pt.setPen( pen0 );
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pt.drawLine( x, y0, x, y1 );
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pt.setPen( pen1 );
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pt.drawLine( x+1, y0, x+1, y1 );
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}
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} else {
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// vertical orientation
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double r = 0.5*cr.height();
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int x0 = cr.x()+1;
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int x1 = cr.right()-1;
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for ( int i = 0; i < n; i++ ) {
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int y = cr.y() + int((1-cos(delta*double(i)+alpha))*r);
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pt.setPen( pen0 );
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pt.drawLine( x0, y, x1, y );
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pt.setPen( pen1 );
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pt.drawLine( x0, y+1, x1, y+1 );
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}
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}
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qDrawShadePanel( &pt, cr, colorGroup());
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pt.end();
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p->drawPixmap( 0, 0, pix );
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}
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int TQThumbWheel::valueFromPosition( const TQPoint &p )
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{
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TQRect wrec = contentsRect();
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int pos, min, max;
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if ( orient == Horizontal ) {
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pos = p.x();
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min = wrec.left();
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max = wrec.right();
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} else {
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pos = p.y();
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min = wrec.top();
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max = wrec.bottom();
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}
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double alpha;
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if ( pos < min )
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alpha = 0;
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else if ( pos > max )
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alpha = m_pi;
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else
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alpha = acos( 1.0 - 2.0*double(pos-min)/double(max-min) );// ### taylor
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double deg = alpha*rad_factor/transmissionRatio();
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// ### use valueFromPosition()
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return minValue() + int((maxValue()-minValue())*deg/360.0);
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}
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#endif
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