QtCollider/widgets/QcSlider2D.cpp

   1 /************************************************************************
   2 *
   3 * Copyright 2010-2012 Jakob Leben (jakob.leben@gmail.com)
   4 *
   5 * This file is part of SuperCollider Qt GUI.
   6 *
   7 * This program is free software: you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation, either version 3 of the License, or
  10 * (at your option) any later version.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *
  20 ************************************************************************/
  21
  22 #include "QcSlider2D.h"
  23 #include "../QcWidgetFactory.h"
  24
  25 #include <QKeyEvent>
  26 #include <QMouseEvent>
  27 #include <QApplication>
  28 #include <QPainter>
  29
  30 QC_DECLARE_QWIDGET_FACTORY(QcSlider2D);
  31
  32 QcSlider2D::QcSlider2D() :
  33   _x( 0.f ),
  34   _y( 0.f ),
  35   _thumbSize( QSize( 12, 12 ) ),
  36   _step( 0.01f )
  37 {
  38   setFocusPolicy( Qt::StrongFocus );
  39   setSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
  40 }
  41
  42 void QcSlider2D::incrementX( double factor )
  43 {
  44    setValue( QPointF( _step * factor + _x, _y ) );
  45 }
  46
  47 void QcSlider2D::decrementX( double factor )
  48 {
  49   setValue( QPointF( -_step * factor + _x, _y ) );
  50 }
  51
  52 void QcSlider2D::incrementY( double factor )
  53 {
  54    setValue( QPointF( _x, _step * factor + _y ) );
  55 }
  56
  57 void QcSlider2D::decrementY( double factor )
  58 {
  59    setValue( QPointF( _x, -_step * factor + _y ) );
  60 }
  61
  62 QRect QcSlider2D::thumbRect()
  63 {
  64   QRect r;
  65
  66   int xPos = _x * (width() - _thumbSize.width());
  67   int yPos = (1.f - _y) * (height() - _thumbSize.height());
  68
  69   r.setX( xPos );
  70   r.setY( yPos );
  71   r.setSize( _thumbSize );
  72
  73   return r;
  74 }
  75
  76 QPointF QcSlider2D::valueFromPos( const QPoint pos )
  77 {
  78   float x = (float) (pos.x() - (_thumbSize.width() * 0.5f) ) /
  79             (width() - _thumbSize.width());
  80   float y = (float) (height() - pos.y() - (_thumbSize.width() * 0.5f) ) /
  81             ( height() - _thumbSize.height() );
  82   return QPointF( x, y );
  83 }
  84
  85 void QcSlider2D::setValue( const QPointF val, bool doAction )
  86 {
  87   float x = qMax( 0.f, qMin( 1.f, (float)val.x() ) );
  88   float y= qMax( 0.f, qMin( 1.f, (float)val.y() ) );
  89   if( x != _x || y != _y ) {
  90     _x = x;
  91     _y = y;
  92     update();
  93     if( doAction ) Q_EMIT( action() );
  94   }
  95 }
  96
  97 void QcSlider2D::mouseMoveEvent ( QMouseEvent * ev )
  98 {
  99   setValue( valueFromPos( ev->pos() ) );
 100 }
 101
 102 void QcSlider2D::mousePressEvent ( QMouseEvent * ev )
 103 {
 104   setValue( valueFromPos( ev->pos() ) );
 105 }
 106
 107 void QcSlider2D::keyPressEvent ( QKeyEvent *e )
 108 {
 109   float step = _step;
 110   switch( e->key() ) {
 111     case Qt::Key_Up:
 112       modifyStep( &step );
 113       setValue( QPointF( _x, _y + step ) ); break;
 114     case Qt::Key_Down:
 115       modifyStep( &step );
 116       setValue( QPointF( _x, _y - step ) ); break;
 117     case Qt::Key_Right:
 118       modifyStep( &step );
 119       setValue( QPointF( _x + step, _y ) ); break;
 120     case Qt::Key_Left:
 121       modifyStep( &step );
 122       setValue( QPointF( _x - step, _y ) ); break;
 123     case Qt::Key_N:
 124       setValue( QPointF( 0.f, 0.f ) ); break;
 125     case Qt::Key_X:
 126       setValue( QPointF( 1.f, 1.f ) ); break;
 127     case Qt::Key_C:
 128       setValue( QPointF( 0.5f, 0.5f ) ); break;
 129     case Qt::Key_R:
 130       Q_EMIT( randomize() );
 131       break;
 132     default: QWidget::keyPressEvent( e );
 133   }
 134 }
 135
 136 void QcSlider2D::paintEvent ( QPaintEvent *e )
 137 {
 138   Q_UNUSED(e);
 139   QPainter p;
 140   p.begin(this);
 141
 142   QPalette plt = palette();
 143
 144   p.setBrush( plt.color( QPalette::Base ) );
 145   p.setPen( plt.color( QPalette::Mid ) );
 146   p.drawRect( rect().adjusted(0,0,-1,-1) );
 147
 148   p.fillRect( thumbRect(), plt.color( QPalette::Text ) );
 149   p.end();
 150 }