src/PixmapViewer.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005 Eyal Lotem <eyal.lotem@gmail.com>                  *
   3  *   Copyright (C) 2005 Alexandre Oliveira <aleprj@gmail.com>              *
   4  *   Copyright (C) 2007 Seb Ruiz <ruiz@kde.org>                            *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.          *
  20  ***************************************************************************/
  21 #include "PixmapViewer.h"
  22 #include "debug.h"
  23
  24 #include <KApplication>
  25
  26 #include <QDesktopWidget>
  27 #include <QMouseEvent>
  28 #include <QLabel>
  29 #include <QPixmap>
  30 #include <QScrollBar>
  31
  32 PixmapViewer::PixmapViewer( QWidget *widget, const QPixmap &pixmap )
  33     : QScrollArea( widget )
  34     , m_isDragging( false )
  35     , m_pixmap( pixmap )
  36 {
  37     resize( m_pixmap.width(), m_pixmap.height() );
  38
  39     QLabel *imageLabel = new QLabel();
  40     imageLabel->setBackgroundRole( QPalette::Base );
  41     imageLabel->setScaledContents( true );
  42     imageLabel->setPixmap( pixmap );
  43
  44     setBackgroundRole( QPalette::Dark );
  45     setWidget( imageLabel );
  46 }
  47
  48 void PixmapViewer::mousePressEvent(QMouseEvent *event)
  49 {
  50     if( Qt::LeftButton == event->button() )
  51     {
  52         m_currentPos = event->globalPos();
  53         m_isDragging = true;
  54     }
  55 }
  56
  57 void PixmapViewer::mouseReleaseEvent(QMouseEvent *event)
  58 {
  59     if( Qt::LeftButton == event->button() )
  60     {
  61         m_currentPos = event->globalPos();
  62         m_isDragging = false;
  63     }
  64 }
  65
  66 void PixmapViewer::mouseMoveEvent(QMouseEvent *event)
  67 {
  68     if( m_isDragging )
  69     {
  70         QPoint delta = m_currentPos - event->globalPos();
  71         horizontalScrollBar()->setValue( horizontalScrollBar()->value() + delta.x() );
  72         verticalScrollBar()->setValue( verticalScrollBar()->value() + delta.y() );
  73         m_currentPos = event->globalPos();
  74     }
  75 }
  76
  77 QSize PixmapViewer::sizeHint() const
  78 {
  79     return size().boundedTo( KApplication::desktop()->size() );
  80 }
  81
  82 #include "PixmapViewer.moc"