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781 lines
16 KiB
781 lines
16 KiB
/***************************************************************************
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kpoti.cpp - potentiometer widget
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-------------------
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begin : Wed Apr 28 23:05:05 MEST 1999
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copyright : (C) 1999 by Martin Lorenz
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email : lorenz@ch.tum.de
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(C) 2002-2003 Matthias Kretz <kretz@kde.org>
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "kpoti.h"
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#include "kpoti.moc"
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#include <tqbitmap.h>
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#include <tqpainter.h>
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#include <tqcolor.h>
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#include <tqdrawutil.h>
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#include <tqtimer.h>
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#include <tqkeycode.h>
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#include <tqpen.h>
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#include <tqstring.h>
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#include <tqstyle.h>
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#include <math.h>
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#include <kpixmap.h>
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#include <kpixmapeffect.h>
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#include <kglobal.h>
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#include <kdebug.h>
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#include <kapplication.h>
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#define PI 3.1415926
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static const int thresholdTime = 500;
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static const int repeatTime = 100;
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static const float maxAngle = PI*135/180; // 140 degrees to both sides
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static const float tickLength = 3;
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struct KPoti::KPotiPrivate
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{
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KPotiPrivate()
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: bgDirty( false )
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, potiDirty( false )
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{}
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bool bgDirty;
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KPixmap bgdb;
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KPixmap bgPixmap( const TQColorGroup & tqcolorGroup )
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{
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if( bgDirty || bgdb.isNull() )
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{
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bgdb.resize( buttonRect.size() );
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TQPainter dbp( &bgdb );
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dbp.setPen( TQt::NoPen );
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TQRect drawRect = bgdb.rect();
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// create tqmask
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TQBitmap tqmask( bgdb.size(), true );
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TQPainter tqmaskpainter( &tqmask );
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tqmaskpainter.setPen( TQt::NoPen );
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tqmaskpainter.setBrush( TQt::color1 );
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tqmaskpainter.drawEllipse( drawRect );
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tqmaskpainter.end();
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bgdb.setMask( tqmask );
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// inset shadow
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KPixmap gradient( bgdb.size() );
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KPixmapEffect::gradient( gradient, tqcolorGroup.light(), tqcolorGroup.dark(), KPixmapEffect::DiagonalGradient );
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dbp.setBrush( TQBrush( tqcolorGroup.button(), gradient ) );
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dbp.drawEllipse( drawRect );
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potiRect.setSize( drawRect.size() * 0.9 );
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if( potiRect.width() + 6 > drawRect.width() )
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{
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potiRect.setWidth( drawRect.width() - 6 );
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potiRect.setHeight( drawRect.height() - 6 );
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}
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potiRect.moveCenter( center );
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bgDirty = false;
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}
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return bgdb;
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}
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TQColor potiColor;
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bool potiDirty;
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KPixmap potidb;
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KPixmap potiPixmap()
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{
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if( ( potiDirty || potidb.isNull() ) && ! potiRect.size().isEmpty() )
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{
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potidb.resize( potiRect.size() );
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TQPainter dbp( &potidb );
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dbp.setPen( TQt::NoPen );
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TQRect drawRect( potidb.rect() );
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// create tqmask
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TQBitmap tqmask( potidb.size(), true );
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TQPainter tqmaskpainter( &tqmask );
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tqmaskpainter.setPen( TQt::NoPen );
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tqmaskpainter.setBrush( TQt::color1 );
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tqmaskpainter.drawEllipse( drawRect );
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tqmaskpainter.end();
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potidb.setMask( tqmask );
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KPixmap gradient( potidb.size() );
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KPixmapEffect::gradient( gradient, potiColor.dark( 130 ), potiColor.light( 130 ), KPixmapEffect::DiagonalGradient );
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dbp.setBrush( TQBrush( potiColor, gradient ) );
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dbp.drawEllipse( drawRect );
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potiDirty = false;
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}
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return potidb;
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}
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TQRect buttonRect;
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TQRect potiRect;
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TQRect labelRect;
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TQString label;
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TQPoint center;
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};
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TQSizePolicy KPoti::sizePolicy() const
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{
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return TQSizePolicy( TQSizePolicy::Preferred, TQSizePolicy::Preferred );
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}
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TQSize KPoti::tqsizeHint() const
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{
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return tqminimumSizeHint();
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}
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TQSize KPoti::tqminimumSizeHint() const
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{
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int width = 40;
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int height = 40;
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if( m_bLabel )
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{
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TQFontMetrics metrics( font() );
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d->labelRect = metrics.boundingRect( d->label );
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d->labelRect.setHeight( metrics.lineSpacing() );
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width = KMAX( width, d->labelRect.width() + frameRect().width() - contentsRect().width() );
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height += metrics.lineSpacing();
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}
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//kdDebug() << k_funcinfo << "return " << width << "x" << height << endl;
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return TQSize( width, height );
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}
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TQString KPoti::text() const
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{
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return d->label;
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}
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void KPoti::setText( const TQString & text )
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{
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d->label = text;
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setMinimumSize( tqminimumSizeHint() );
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updateGeometry();
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}
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/**
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Constructs a poti.
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The \e tqparent and \e name arguments are sent to the TQWidget constructor.
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*/
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KPoti::KPoti( TQWidget *tqparent, const char *name )
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: TQFrame( tqparent, name, WResizeNoErase | WRepaintNoErase )
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, d( 0 )
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{
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init();
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}
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/**
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Constructs a poti.
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\arg \e minValue is the minimum slider value.
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\arg \e maxValue is the maximum slider value.
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\arg \e step is the page step value.
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\arg \e value is the initial value.
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The \e tqparent and \e name arguments are sent to the TQWidget constructor.
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*/
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KPoti::KPoti( int minValue, int maxValue, int step,
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int value, TQWidget *tqparent, const char *name )
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: TQFrame( tqparent, name, WResizeNoErase | WRepaintNoErase )
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, TQRangeControl( minValue, maxValue, 1, step, value )
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, d( 0 )
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{
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init(value);
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}
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KPoti::~KPoti()
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{
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delete d;
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d = 0;
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}
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void KPoti::init(int value)
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{
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d = new KPotiPrivate;
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const_cast<QFont&>(font()).setPointSize( 8 );
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d->potiColor.setNamedColor( "red" );
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timer = 0;
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potiVal = value;
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potiPos = positionFromValue(value);
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clickOffset = 0;
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state = Idle;
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track = TRUE;
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ticks = TRUE;
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m_bLabel = true;
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tickInt = 0;
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setFocusPolicy( TQ_TabFocus );
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initTicks();
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}
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/**
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Does what's needed when someone changes the tickmark status
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*/
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void KPoti::initTicks()
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{
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TQRect available = contentsRect();
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if( m_bLabel )
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available.rTop() += d->labelRect.height();
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d->center = available.center();
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// make the width and height equal
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if( available.width() > available.height() )
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available.setWidth( available.height() );
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else if( available.height() > available.width() )
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available.setHeight( available.width() );
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available.moveCenter( d->center );
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d->buttonRect = available;
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buttonRadius = available.width() / 2.0;
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if( ticks )
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{
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buttonRadius -= tickLength;
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int tickSpace = static_cast<int>( tickLength );
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d->buttonRect.rTop() += tickSpace;
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d->buttonRect.rLeft() += tickSpace;
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d->buttonRect.rRight() -= tickSpace;
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d->buttonRect.rBottom() -= tickSpace;
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}
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d->potiDirty = true;
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d->bgDirty = true;
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}
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/**
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Enables slider tracking if \e enable is TRUE, or disables tracking
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if \e enable is FALSE.
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If tracking is enabled (default), the slider emits the
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valueChanged() signal whenever the slider is being dragged. If
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tracking is disabled, the slider emits the valueChanged() signal
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when the user releases the mouse button (unless the value happens to
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be the same as before).
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\sa tracking()
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*/
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void KPoti::setTracking( bool enable )
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{
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track = enable;
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}
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/**
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\fn bool KPoti::tracking() const
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Returns TRUE if tracking is enabled, or FALSE if tracking is disabled.
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Tracking is initially enabled.
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\sa setTracking()
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*/
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/**
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\fn void KPoti::valueChanged( int value )
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This signal is emitted when the slider value is changed, with the
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new slider value as an argument.
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*/
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/**
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\fn void KPoti::sliderPressed()
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This signal is emitted when the user presses the slider with the mouse.
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*/
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/**
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\fn void KPoti::sliderMoved( int value )
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This signal is emitted when the slider is dragged, with the
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new slider value as an argument.
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*/
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/**
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\fn void KPoti::sliderReleased()
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This signal is emitted when the user releases the slider with the mouse.
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*/
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/**
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Calculates slider position corresponding to value \a v. Does not perform
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rounding.
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*/
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float KPoti::positionFromValue( int v ) const
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{
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int range = maxValue() - minValue();
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return ( (v - minValue() ) *2* maxAngle) / range - maxAngle;
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}
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/**
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Calculates value corresponding to poti position \a p. Performs rounding.
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*/
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int KPoti::valueFromPosition( float p ) const
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{
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int range = maxValue() - minValue();
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return (int) (minValue() + ((p+maxAngle)*range)/(2*maxAngle));
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}
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/*!
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Implements the virtual TQRangeControl function.
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*/
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void KPoti::rangeChange()
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{
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float newPos = positionFromValue( value() );
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if ( newPos != potiPos ) {
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reallyMovePoti( newPos );
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}
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}
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void KPoti::paletteChange( const TQPalette & )
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{
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d->bgDirty = true;
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d->potiDirty = true;
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}
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/*!
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Changes the value (slot)
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*/
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void KPoti::valueChange()
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{
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if ( potiVal != value() ) {
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float newPos = positionFromValue( value() );
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potiVal = value();
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reallyMovePoti( newPos );
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}
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emit valueChanged(value());
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}
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/*!
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Handles resize events for the poti.
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*/
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void KPoti::resizeEvent( TQResizeEvent * )
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{
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rangeChange();
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initTicks();
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}
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void KPoti::setLabel(bool s)
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{
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m_bLabel = s;
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initTicks();
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}
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/**
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Sets the color of the button
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*/
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void KPoti::setColor( const TQColor &c )
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{
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d->potiColor = c;
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d->potiDirty = true;
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tqrepaint();
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}
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void KPoti::paintPoti( TQPainter * p )
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{
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if( isVisible() )
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{
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KPixmap db = d->potiPixmap();
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if( db.isNull() )
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return;
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TQPainter p2( &db );
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p2.translate( db.rect().center().x(), db.rect().center().y() );
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p2.rotate( potiPos * 180.0 / PI );
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TQRect pointer( db.width() / -20, db.width() / -2, db.width() / 10, db.width() / 2 );
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TQBrush buttonbrush( tqcolorGroup().button() );
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qDrawShadePanel( &p2, pointer, tqcolorGroup(), true, 1, &buttonbrush );
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p2.end();
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p->drawPixmap( d->potiRect, db );
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}
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}
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/*!
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Performs the actual moving of the slider.
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*/
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void KPoti::reallyMovePoti( float newPos )
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{
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TQPainter p;
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p.begin( this );
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p.setPen(NoPen);
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potiPos = newPos;
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paintPoti(&p);
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p.end();
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}
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/**
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Handles paint events for the slider.
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*/
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void KPoti::drawContents( TQPainter * p )
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{
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TQPixmap doublebuffer( contentsRect().size() );
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doublebuffer.fill( tqcolorGroup().background() );
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TQPainter dbp( &doublebuffer );
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if( m_bLabel )
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{
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dbp.setFont( font() );
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TQFontMetrics metrics = dbp.fontMetrics();
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dbp.drawText( contentsRect().x() - metrics.leftBearing( d->label[ 0 ] ) + ( contentsRect().width() - d->labelRect.width() ) / 2, metrics.height(), d->label );
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}
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int interval = tickInt;
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if( interval <= 0 )
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interval = 12;
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if( ticks )
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drawTicks( &dbp, buttonRadius, tickLength, interval );
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dbp.drawPixmap( d->buttonRect, d->bgPixmap( tqcolorGroup() ) );
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if( hasFocus() )
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tqstyle().tqdrawPrimitive( TQStyle::PE_FocusRect, &dbp, d->buttonRect, tqcolorGroup() );
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paintPoti( &dbp );
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dbp.end();
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p->drawPixmap( contentsRect(), doublebuffer );
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}
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/*!
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Handles mouse press events for the slider.
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*/
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void KPoti::mousePressEvent( TQMouseEvent *e )
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{
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resetState();
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if ( e->button() == Qt::MidButton ) {
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double pos = atan2( double(e->pos().x()-d->center.x()),
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double(- e->pos().y() + d->center.y()) );
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movePoti( pos );
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return;
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}
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if ( e->button() != Qt::LeftButton )
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return;
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int dx=e->pos().x()-d->center.x(), dy=e->pos().y()-d->center.y();
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if ( dx*dx+dy*dy < buttonRadius*buttonRadius ) {
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state = Dragging;
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clickOffset = potiVal + (e->pos().y() ) ;
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emit potiPressed();
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} else if ( e->pos().x() < width()/2 ) {
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state = TimingDown;
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subtractPage();
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if ( !timer )
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timer = new TQTimer( this );
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connect( timer, TQT_SIGNAL(timeout()), TQT_SLOT(repeatTimeout()) );
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timer->start( thresholdTime, TRUE );
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} else {
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state = TimingUp;
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addPage();
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if ( !timer )
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timer = new TQTimer( this );
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connect( timer, TQT_SIGNAL(timeout()), TQT_SLOT(repeatTimeout()) );
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timer->start( thresholdTime, TRUE );
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}
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}
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/*!
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Handles mouse move events for the slider.
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*/
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void KPoti::mouseMoveEvent( TQMouseEvent *e )
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{
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if ( (e->state() & Qt::MidButton) ) { // middle button wins
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double pos = atan2( double(e->pos().x()-d->center.x()),
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double(- e->pos().y()+d->center.y()) );
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movePoti( pos );
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return;
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}
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if ( !(e->state() & Qt::LeftButton) )
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return; // left mouse button is up
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if ( state != Dragging )
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return;
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movePoti( positionFromValue(- e->pos().y() + clickOffset ));
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}
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/*!
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Handles mouse release events for the slider.
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*/
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void KPoti::mouseReleaseEvent( TQMouseEvent *e )
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{
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if ( !(e->button() & Qt::LeftButton) )
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return;
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resetState();
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}
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void KPoti::focusInEvent( TQFocusEvent * e )
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{
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//setFrameStyle( Raised | Box );
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//setLineWidth( 1 );
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TQFrame::focusInEvent( e );
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}
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void KPoti::focusOutEvent( TQFocusEvent * e )
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{
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//setFrameStyle( NoFrame );
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//setLineWidth( 0 );
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TQFrame::focusOutEvent( e );
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}
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void KPoti::enterEvent( TQEvent * )
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{
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emit mouseEntered( potiVal );
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}
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/*!
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Moves the left (or top) edge of the slider to position
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\a pos. Performs snapping.
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*/
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void KPoti::movePoti( float pos )
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{
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float newPos = TQMIN( maxAngle, TQMAX( -maxAngle, pos ) );
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int newVal = valueFromPosition( newPos );
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if ( potiVal != newVal ) {
|
|
potiVal = newVal;
|
|
emit potiMoved( potiVal );
|
|
}
|
|
if ( tracking() && potiVal != value() ) {
|
|
directSetValue( potiVal );
|
|
emit valueChanged( potiVal );
|
|
}
|
|
|
|
|
|
if ( potiPos != newPos )
|
|
reallyMovePoti( newPos );
|
|
}
|
|
|
|
|
|
/*!
|
|
Resets all state information and stops my timer.
|
|
*/
|
|
|
|
void KPoti::resetState()
|
|
{
|
|
if ( timer ) {
|
|
timer->stop();
|
|
timer->disconnect();
|
|
}
|
|
switch ( state ) {
|
|
case TimingUp:
|
|
case TimingDown:
|
|
break;
|
|
case Dragging: {
|
|
setValue( valueFromPosition( potiPos ) );
|
|
emit potiReleased();
|
|
break;
|
|
}
|
|
case Idle:
|
|
break;
|
|
default:
|
|
kdWarning() << "KPoti: in wrong state" << endl;
|
|
}
|
|
state = Idle;
|
|
}
|
|
|
|
|
|
/*!
|
|
Handles key press events for the slider.
|
|
*/
|
|
|
|
void KPoti::keyPressEvent( TQKeyEvent *e )
|
|
{
|
|
|
|
switch ( e->key() ) {
|
|
case Key_Left:
|
|
subtractLine();
|
|
break;
|
|
case Key_Right:
|
|
addLine();
|
|
break;
|
|
case Key_Up:
|
|
addLine();
|
|
break;
|
|
case Key_Down:
|
|
subtractLine();
|
|
break;
|
|
case Key_Prior:
|
|
subtractPage();
|
|
break;
|
|
case Key_Next:
|
|
addPage();
|
|
break;
|
|
case Key_Home:
|
|
setValue( minValue() );
|
|
break;
|
|
case Key_End:
|
|
setValue( maxValue() );
|
|
break;
|
|
default:
|
|
e->ignore();
|
|
return;
|
|
}
|
|
e->accept();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*!
|
|
Makes TQRangeControl::setValue() available as a slot.
|
|
*/
|
|
|
|
void KPoti::setValue( int value )
|
|
{
|
|
TQRangeControl::setValue( value );
|
|
}
|
|
|
|
|
|
/*!
|
|
Moves the slider one pageStep() upwards.
|
|
*/
|
|
|
|
void KPoti::addStep()
|
|
{
|
|
addPage();
|
|
}
|
|
|
|
|
|
/*!
|
|
Moves the slider one pageStep() downwards.
|
|
*/
|
|
|
|
void KPoti::subtractStep()
|
|
{
|
|
subtractPage();
|
|
}
|
|
|
|
|
|
/*!
|
|
Waits for autorepeat.
|
|
*/
|
|
|
|
void KPoti::repeatTimeout()
|
|
{
|
|
Q_ASSERT( timer );
|
|
timer->disconnect();
|
|
if ( state == TimingDown )
|
|
connect( timer, TQT_SIGNAL(timeout()), TQT_SLOT(subtractStep()) );
|
|
else if ( state == TimingUp )
|
|
connect( timer, TQT_SIGNAL(timeout()), TQT_SLOT(addStep()) );
|
|
timer->start( repeatTime, FALSE );
|
|
}
|
|
|
|
|
|
|
|
|
|
/*!
|
|
Using \a p, draws tickmarks at a distance of \a dist from the edge
|
|
of the widget, using \a w pixels and \a i intervals.
|
|
*/
|
|
|
|
void KPoti::drawTicks( TQPainter *p, double dist, double w, int i ) const
|
|
{
|
|
p->setPen( tqcolorGroup().foreground() );
|
|
double angle,s,c;
|
|
double x, y;
|
|
for (int v=0; v<=i; v++)
|
|
{
|
|
angle = -maxAngle+2*maxAngle*v/i;
|
|
s = sin( angle );
|
|
c = cos( angle );
|
|
x = d->center.x() - s * dist;
|
|
y = d->center.y() - c * dist;
|
|
|
|
p->drawLine( (int)x, (int)y, (int)(x - s * w), (int)(y - c * w) );
|
|
}
|
|
}
|
|
|
|
void KPoti::wheelEvent(TQWheelEvent *e)
|
|
{
|
|
setValue(value()+e->delta()/120*8);
|
|
}
|
|
|
|
|
|
/*!
|
|
Sets the way tickmarks are displayed by the slider. \a s can take
|
|
the following values:
|
|
<ul>
|
|
<li> \c NoMarks
|
|
<li> \c Above
|
|
<li> \c Left
|
|
<li> \c Below
|
|
<li> \c Right
|
|
<li> \c Both
|
|
</ul>
|
|
The initial value is \c NoMarks.
|
|
\sa tickmarks(), setTickInterval()
|
|
*/
|
|
|
|
void KPoti::setTickmarks( bool s )
|
|
{
|
|
ticks = s;
|
|
initTicks();
|
|
update();
|
|
}
|
|
|
|
|
|
|
|
/*!
|
|
Sets the interval between tickmarks to \a i. This is a value interval,
|
|
not a pixel interval. If \a i is 0, the slider
|
|
will choose between lineStep() and pageStep(). The initial value of
|
|
tickInterval() is 0.
|
|
\sa tickInterval(), TQRangeControl::lineStep(), TQRangeControl::pageStep()
|
|
*/
|
|
|
|
void KPoti::setTickInterval( int i )
|
|
{
|
|
tickInt = TQMAX( 0, i );
|
|
update();
|
|
}
|
|
|
|
|
|
/*!
|
|
\fn int KPoti::tickInterval() const
|
|
Returns the interval between tickmarks. Returns 0 if the slider
|
|
chooses between pageStep() and lineStep().
|
|
\sa setTickInterval()
|
|
*/
|
|
|
|
// vim: sw=4 ts=4
|