krita

kis_gradient_slider_widget.cc

00001 /*
00002  *  Copyright (c) 2004 Cyrille Berger <cberger@cberger.net>
00003  *                2004 Sven Langkamp <longamp@reallygood.de>
00004  *
00005  *  This program is free software; you can redistribute it and/or modify
00006  *  it under the terms of the GNU General Public License as published by
00007  *  the Free Software Foundation; either version 2 of the License, or
00008  *  (at your option) any later version.
00009  *
00010  *  This program is distributed in the hope that it will be useful,
00011  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00012  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00013  *  GNU General Public License for more details.
00014  *
00015  *  You should have received a copy of the GNU General Public License
00016  *  along with this program; if not, write to the Free Software
00017  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00018  */
00019 
00020 #include "kis_gradient_slider_widget.h"
00021 
00022 #include <qpainter.h>
00023 
00024 #include <kdebug.h>
00025 #include <kpopupmenu.h>
00026 #include <klocale.h>
00027 
00028 #include "kis_autogradient_resource.h"
00029 
00030 #define MARGIN 5
00031 #define HANDLE_SIZE 10
00032 
00033 KisGradientSliderWidget::KisGradientSliderWidget(QWidget *parent, const char* name, WFlags f )
00034     : QWidget( parent, name, f),
00035     m_currentSegment(0),
00036     m_selectedSegment(0),
00037     m_drag(0)
00038 {
00039     setMinimumHeight(30);
00040 
00041     m_segmentMenu = new KPopupMenu();
00042     m_segmentMenu->insertItem(i18n("Split Segment"), SPLIT_SEGMENT);
00043     m_segmentMenu->insertItem(i18n("Duplicate Segment"), DUPLICATE_SEGMENT);
00044     m_segmentMenu->insertItem(i18n("Mirror Segment"), MIRROR_SEGMENT);
00045     m_segmentMenu->insertItem(i18n("Remove Segment"), REMOVE_SEGMENT);
00046     connect( m_segmentMenu, SIGNAL( activated(int) ), SLOT( slotMenuAction(int) ) );
00047 }
00048 
00049 void KisGradientSliderWidget::setGradientResource( KisAutogradientResource* agr)
00050 {
00051     m_autogradientResource = agr;
00052     m_selectedSegment = m_autogradientResource->segmentAt(0.0);
00053     emit sigSelectedSegment( m_selectedSegment );
00054 }
00055 
00056 void KisGradientSliderWidget::paintEvent ( QPaintEvent* pe )
00057 {
00058     QWidget::paintEvent( pe );
00059     QPixmap pixmap( width(), height() );
00060     pixmap.fill( colorGroup().background() );
00061     QPainter painter( &pixmap );
00062     painter.setPen( Qt::black );
00063     painter.drawRect( MARGIN, MARGIN, width() - 2 * MARGIN, height()- 2 * MARGIN - HANDLE_SIZE );
00064     if(m_autogradientResource)
00065     {
00066         QImage img = m_autogradientResource->generatePreview(width()- 2* MARGIN - 2, height()- 2* MARGIN - HANDLE_SIZE - 2);
00067         QPixmap pixmap(img.width(), img.height());
00068         if (!img.isNull()) {
00069             m_pixmapIO.putImage(&pixmap, 0, 0, &img);
00070             painter.drawPixmap( MARGIN + 1, MARGIN + 1, pixmap, 0, 0, pixmap.width(), pixmap.height());
00071         }
00072 
00073         painter.fillRect( MARGIN + 1, height()- MARGIN - HANDLE_SIZE, width() - 2 * MARGIN, HANDLE_SIZE, QBrush( Qt::white ) );
00074         if( m_selectedSegment )
00075         {
00076             QRect selection( qRound( m_selectedSegment->startOffset()*(double)(width()- 2 * MARGIN - 2) ) + 6,
00077                     height()- HANDLE_SIZE - MARGIN,
00078                     qRound( ( m_selectedSegment->endOffset() - m_selectedSegment->startOffset() )*(double)(width()-12) ),
00079                     HANDLE_SIZE );
00080             painter.fillRect( selection, QBrush( colorGroup().highlight() ) );
00081         }
00082 
00083         QPointArray triangle(3);
00084         QValueVector<double> handlePositions = m_autogradientResource->getHandlePositions();
00085         int position;
00086         painter.setBrush( QBrush( Qt::black) );
00087         for (uint i = 0; i < handlePositions.count(); i++)
00088         {
00089             position = qRound( handlePositions[i] * (double)( width()-12) ) + 6;
00090             triangle[0] = QPoint(position, height() - HANDLE_SIZE - MARGIN );
00091             triangle[1] = QPoint(position + (HANDLE_SIZE / 2 - 1), height() - MARGIN );
00092             triangle[2] = QPoint(position - (HANDLE_SIZE / 2 - 1), height() - MARGIN );
00093             painter.drawPolygon(triangle);
00094         }
00095         painter.setBrush( QBrush( Qt::white ) );
00096         QValueVector<double> middleHandlePositions = m_autogradientResource->getMiddleHandlePositions();
00097         for (uint i = 0; i < middleHandlePositions.count(); i++)
00098         {
00099             position = qRound( middleHandlePositions[i] * (double)(width()-12) ) + 6;
00100             triangle[0] = QPoint(position, height()-HANDLE_SIZE - MARGIN);
00101             triangle[1] = QPoint(position + (HANDLE_SIZE / 2 - 2), height() - MARGIN);
00102             triangle[2] = QPoint(position - (HANDLE_SIZE / 2 - 2), height() - MARGIN);
00103             painter.drawPolygon(triangle);
00104         }
00105     }
00106     bitBlt( this, 0, 0, &pixmap, 0, 0, pixmap.width(), pixmap.height(), Qt::CopyROP);
00107 }
00108 
00109 void KisGradientSliderWidget::mousePressEvent( QMouseEvent * e )
00110 {
00111     QWidget::mousePressEvent( e );
00112     if( ( e->y() < MARGIN || e->y() > height() - MARGIN ) || ( e->x() < MARGIN || e->x() > width() - MARGIN ) || e-> button() != LeftButton )
00113         return;
00114     double t = (double)(e->x() - MARGIN) / (double)(width() - 2 * MARGIN);
00115     KisGradientSegment* segment = 0;
00116     segment = m_autogradientResource->segmentAt(t);
00117     if(segment != 0)
00118     {
00119         m_currentSegment = segment;
00120         QRect leftHandle( qRound(m_currentSegment->startOffset() * (double)(width()-2*MARGIN-2)+ MARGIN - (HANDLE_SIZE/2 - 1 )),
00121                     height() - HANDLE_SIZE,
00122                     HANDLE_SIZE - 1,
00123                     HANDLE_SIZE);
00124         QRect middleHandle( qRound(m_currentSegment->middleOffset() * (double)(width()-2*MARGIN-2)+ MARGIN - (HANDLE_SIZE/2 -2) ),
00125                     height() - HANDLE_SIZE - MARGIN,
00126                     HANDLE_SIZE - 1,
00127                     HANDLE_SIZE);
00128         QRect rightHandle( qRound(m_currentSegment->endOffset() * (double)(width()-2*MARGIN-2)+ MARGIN - (HANDLE_SIZE/2 - 1 )),
00129                     height() - HANDLE_SIZE,
00130                     HANDLE_SIZE - 1,
00131                     HANDLE_SIZE);
00132         // Change the activation order of the handles to avoid deadlocks
00133         if( t > 0.5 )
00134         {
00135             if( leftHandle.contains( e->pos() ) )
00136                 m_drag = LEFT_DRAG;
00137             else if( middleHandle.contains( e->pos() ) )
00138                 m_drag = MIDDLE_DRAG;
00139             else if( rightHandle.contains( e->pos() ) )
00140                 m_drag = RIGHT_DRAG;
00141         }
00142         else
00143         {
00144             if( rightHandle.contains( e->pos() ) )
00145                 m_drag = RIGHT_DRAG;
00146             else if( middleHandle.contains( e->pos() ) )
00147                 m_drag = MIDDLE_DRAG;
00148             else if( leftHandle.contains( e->pos() ) )
00149                 m_drag = LEFT_DRAG;
00150         }
00151 
00152         if( m_drag == NO_DRAG )
00153         {
00154             m_selectedSegment = m_currentSegment;
00155             emit sigSelectedSegment( m_selectedSegment );
00156         }
00157     }
00158     repaint(false);
00159 }
00160 
00161 void KisGradientSliderWidget::mouseReleaseEvent ( QMouseEvent * e )
00162 {
00163     QWidget::mouseReleaseEvent( e );
00164     m_drag = NO_DRAG;
00165 }
00166 
00167 void KisGradientSliderWidget::mouseMoveEvent( QMouseEvent * e )
00168 {
00169     QWidget::mouseMoveEvent( e );
00170     if( ( e->y() < MARGIN || e->y() > height() - MARGIN ) || ( e->x() < MARGIN || e->x() > width() - MARGIN ) )
00171         return;
00172     double t = (double)(e->x() - MARGIN) / (double)(width() - 2 * MARGIN);
00173     switch( m_drag )
00174     {
00175         case RIGHT_DRAG:
00176             m_autogradientResource->moveSegmentEndOffset( m_currentSegment, t );
00177             break;
00178         case LEFT_DRAG:
00179             m_autogradientResource->moveSegmentStartOffset( m_currentSegment, t );
00180             break;
00181         case MIDDLE_DRAG:
00182             m_autogradientResource->moveSegmentMiddleOffset( m_currentSegment, t );
00183             break;
00184     }
00185 
00186     if ( m_drag != NO_DRAG)
00187         emit sigChangedSegment( m_currentSegment );
00188 
00189     repaint(false);
00190 }
00191 
00192 void KisGradientSliderWidget::contextMenuEvent( QContextMenuEvent * e )
00193 {
00194     m_segmentMenu->setItemEnabled( REMOVE_SEGMENT, m_autogradientResource->removeSegmentPossible() );
00195     m_segmentMenu->popup( e->globalPos());
00196 }
00197 
00198 void KisGradientSliderWidget::slotMenuAction( int id )
00199 {
00200     switch( id )
00201     {
00202         case SPLIT_SEGMENT:
00203             m_autogradientResource->splitSegment( m_selectedSegment );
00204             break;
00205         case DUPLICATE_SEGMENT:
00206             m_autogradientResource->duplicateSegment( m_selectedSegment );
00207             break;
00208         case MIRROR_SEGMENT:
00209             m_autogradientResource->mirrorSegment( m_selectedSegment );
00210             break;
00211         case REMOVE_SEGMENT:
00212             m_selectedSegment = m_autogradientResource->removeSegment( m_selectedSegment );
00213             break;
00214     }
00215     emit sigSelectedSegment( m_selectedSegment );
00216     repaint(false);
00217 }
00218 
00219 #include "kis_gradient_slider_widget.moc"
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