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* KMix -- KDE's full featured mini mixer
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* Copyright (C) 2000 Stefan Schimanski <1Stein@gmx.de>
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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* You should have received a copy of the GNU Library General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#include <QMouseEvent>
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#include <QStyleOptionSlider>
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#include "kglobalsettings.h"
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#include "ksmallslider.h"
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KSmallSlider::KSmallSlider( int minValue, int maxValue, int pageStep,
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int value, Qt::Orientation orientation,
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QWidget *parent, const char * /*name*/ )
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: QAbstractSlider( parent )
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setOrientation(orientation);
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setRange(minValue, maxValue);
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setPageStep(pageStep);
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void KSmallSlider::init()
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setFocusPolicy( Qt::TabFocus );
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colHigh = QColor(0,255,0);
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colLow = QColor(255,0,0);
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colBack = QColor(0,0,0);
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grayHigh = QColor(255,255,255);
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grayLow = QColor(128,128,128);
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grayBack = QColor(0,0,0);
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int KSmallSlider::positionFromValue( int v ) const
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return positionFromValue( v, available() );
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int KSmallSlider::valueFromPosition( int p ) const
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if ( orientation() == Qt::Vertical ) {
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// Coordiante System starts at TopLeft, but the slider values increase from Bottom to Top
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// Thus "revert" the position
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int avail = available();
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return valueFromPosition( avail - p, avail );
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// Horizontal everything is fine. Slider values match with Coordinate System
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return valueFromPosition( p, available() );
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/* postionFromValue() discontinued in in Qt4 => taken from Qt3 */
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int KSmallSlider::positionFromValue( int logical_val, int span ) const
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if ( span <= 0 || logical_val < minimum() || maximum() <= minimum() )
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if ( logical_val > maximum() )
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uint range = maximum() - minimum();
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uint p = logical_val - minimum();
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if ( range > (uint)INT_MAX/4096 ) {
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const int scale = 4096*2;
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return ( (p/scale) * span ) / (range/scale);
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// ### the above line is probably not 100% correct
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// ### but fixing it isn't worth the extreme pain...
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} else if ( range > (uint)span ) {
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return (2*p*span + range) / (2*range);
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uint div = span / range;
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uint mod = span % range;
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return p*div + (2*p*mod + range) / (2*range);
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//equiv. to (p*span)/range + 0.5
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// no overflow because of this implicit assumption:
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/* valueFromPositon() discontinued in in Qt4 => taken from Qt3 */
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int KSmallSlider::valueFromPosition( int pos, int span ) const
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if ( span <= 0 || pos <= 0 )
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uint range = maximum() - minimum();
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if ( (uint)span > range )
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return minimum() + (2*pos*range + span) / (2*span);
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uint div = range / span;
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uint mod = range % span;
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return minimum() + pos*div + (2*pos*mod + span) / (2*span);
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// equiv. to minimum() + (pos*range)/span + 0.5
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// no overflow because of this implicit assumption:
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// pos <= span < sqrt(INT_MAX+0.0625)+0.25 ~ sqrt(INT_MAX)
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void KSmallSlider::resizeEvent( QResizeEvent * )
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//QWidget::resizeEvent( ev );
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// Returns the really available space for the slider. If there is no space, 0 is returned;
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int KSmallSlider::available() const
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if ( orientation() == Qt::Vertical) {
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available = height();
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if ( available > 1 ) {
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void gradient( QPainter &p, bool hor, const QRect &rect, const QColor &ca, const QColor &cb, int /*ncols*/)
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int rDiff, gDiff, bDiff;
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int rca, gca, bca, rcb, gcb, bcb;
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if ((rect.width()<=0) || (rect.height()<=0)) return;
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rDiff = (rcb = cb.red()) - (rca = ca.red());
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gDiff = (gcb = cb.green()) - (gca = ca.green());
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bDiff = (bcb = cb.blue()) - (bca = ca.blue());
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register int rl = rca << 16;
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register int gl = gca << 16;
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register int bl = bca << 16;
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int rcdelta = ((1<<16) / ((!hor) ? rect.height() : rect.width())) * rDiff;
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int gcdelta = ((1<<16) / ((!hor) ? rect.height() : rect.width())) * gDiff;
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int bcdelta = ((1<<16) / ((!hor) ? rect.height() : rect.width())) * bDiff;
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// these for-loops could be merged, but the if's in the inner loop
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// would make it slow
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for ( y = rect.top(); y <= rect.bottom(); y++ ) {
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p.setPen(QColor(rl>>16, gl>>16, bl>>16));
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p.drawLine(rect.left(), y, rect.right(), y);
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for( x = rect.left(); x <= rect.right(); x++) {
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p.setPen(QColor(rl>>16, gl>>16, bl>>16));
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p.drawLine(x, rect.top(), x, rect.bottom());
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QColor interpolate( QColor low, QColor high, int percent ) {
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if ( percent<=0 ) return low; else
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if ( percent>=100 ) return high; else
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low.red() + (high.red()-low.red()) * percent/100,
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low.green() + (high.green()-low.green()) * percent/100,
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low.blue() + (high.blue()-low.blue()) * percent/100 );
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void KSmallSlider::paintEvent( QPaintEvent * )
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// kDebug(67100) << "KSmallSlider::paintEvent: width() = " << width() << ", height() = " << height();
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int sliderPos = positionFromValue( QAbstractSlider::value() );
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// ------------------------ draw 3d border ---------------------------------------------
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QStyleOptionSlider option;
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style()->drawPrimitive ( QStyle::PE_Frame, &option, &p );
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// ------------------------ draw lower/left part ----------------------------------------
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if ( width()>2 && height()>2 )
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if ( orientation() == Qt::Horizontal ) {
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QRect outer = QRect( 1, 1, sliderPos, height() - 2 );
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// kDebug(67100) << "KSmallSlider::paintEvent: outer = " << outer;
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gradient( p, true, outer, grayLow,
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interpolate( grayLow, grayHigh, 100*sliderPos/(width()-2) ),
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gradient( p, true, outer, colLow,
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interpolate( colLow, colHigh, 100*sliderPos/(width()-2) ),
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QRect outer = QRect( 1, height()-sliderPos-1, width() - 2, sliderPos-1 );
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kDebug(67100) << "KSmallSlider::paintEvent: sliderPos=" << sliderPos
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<< "height()=" << height()
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<< "width()=" << width()
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<< "outer = " << outer << endl;
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gradient( p, false, outer,
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interpolate( grayLow, grayHigh, 100*sliderPos/(height()-2) ),
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gradient( p, false, outer,
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interpolate( colLow, colHigh, 100*sliderPos/(height()-2) ),
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// -------- draw upper/right part --------------------------------------------------
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if ( orientation() == Qt::Vertical ) {
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inner = QRect( 1, 1, width() - 2, height() - 2 -sliderPos );
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inner = QRect( sliderPos + 1, 1, width() - 2 - sliderPos, height() - 2 );
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p.setBrush( grayBack );
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p.setPen( grayBack );
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p.setBrush( colBack );
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void KSmallSlider::mousePressEvent( QMouseEvent *e )
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if ( e->button() == Qt::RightButton ) {
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int pos = goodPart( e->pos() );
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void KSmallSlider::mouseMoveEvent( QMouseEvent *e )
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int pos = goodPart( e->pos() );
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void KSmallSlider::wheelEvent( QWheelEvent * e)
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// kDebug(67100) << "KSmallslider::wheelEvent()";
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int inc = ( maximum() - minimum() ) / 20;
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//kDebug(67100) << "KSmallslider::wheelEvent() inc=" << inc << "delta=" << e->delta();
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if ( e->delta() > 0 ) {
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setValue( QAbstractSlider::value() + inc );
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setValue( QAbstractSlider::value() - inc );
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e->accept(); // Accept the event
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// Hint: Qt autmatically triggers a valueChange() when we do setValue()
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* Moves slider to a dedicated position. If the value has changed
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void KSmallSlider::moveSlider( int pos )
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int newPos = qMin( a, qMax( 0, pos ) ); // keep it inside the available bounds of the slider
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int newVal = valueFromPosition( newPos );
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if ( newVal != value() ) {
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// probably done by Qt: emit valueChanged( value() ); // Only for external use
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// probably we need update() here
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int KSmallSlider::goodPart( const QPoint &p ) const
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if ( orientation() == Qt::Vertical ) {
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/***************** SIZE STUFF START ***************/
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QSize KSmallSlider::sizeHint() const
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const int length = 25;
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const int thick = 10;
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if ( orientation() == Qt::Vertical )
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return QSize( thick, length );
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return QSize( length, thick );
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QSize KSmallSlider::minimumSizeHint() const
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QSizePolicy KSmallSlider::sizePolicy() const
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if ( orientation() == Qt::Vertical ) {
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//kDebug(67100) << "KSmallSlider::sizePolicy() vertical value=(Fixed,MinimumExpanding)\n";
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return QSizePolicy( QSizePolicy::Fixed, QSizePolicy::Expanding );
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//kDebug(67100) << "KSmallSlider::sizePolicy() horizontal value=(MinimumExpanding,Fixed)\n";
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return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Fixed );
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/***************** SIZE STUFF END ***************/
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void KSmallSlider::setGray( bool value )
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bool KSmallSlider::gray() const
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void KSmallSlider::setColors( QColor high, QColor low, QColor back )
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void KSmallSlider::setGrayColors( QColor high, QColor low, QColor back )
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#include "ksmallslider.moc"
added
removed
kmix/ksmallslider.cpp
