workspace/kcontrol/kdm/background/bgmonitor.cpp

   1 /* vi: ts=8 sts=4 sw=4
   2    kate: space-indent on; indent-width 4; indent-mode cstyle;
   3
   4    This file is part of the KDE project, module kcmbackground.
   5
   6    Copyright (C) 2002 Laurent Montel <montell@club-internet.fr>
   7    Copyright (C) 2003 Waldo Bastian <bastian@kde.org>
   8    Copyright (C) 2005 David Saxton <david@bluehaze.org>
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License
  12    version 2 as published by the Free Software Foundation.
  13
  14    This library is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    Library General Public License for more details.
  18
  19    You should have received a copy of the GNU Library General Public License
  20    along with this library; see the file COPYING.LIB.  If not, write to
  21    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22    Boston, MA 02110-1301, USA.
  23  */
  24
  25 #include <k3urldrag.h>
  26
  27 #include "bgmonitor.h"
  28 //Added by qt3to4:
  29 #include <QDragEnterEvent>
  30 #include <QDropEvent>
  31 #include <QApplication>
  32 #include <QDesktopWidget>
  33 #include <QPixmap>
  34 #include <klocale.h>
  35 #include <kdebug.h>
  36 #include <kstandarddirs.h>
  37 #include <QPainter>
  38
  39 // Constants used (should they be placed somewhere?)
  40 // Size of monitor image: 200x186
  41 // Geometry of "display" part of monitor image: (23,14)-[151x115]
  42
  43 //BEGIN class BGMonitorArrangement
  44 BGMonitorArrangement::BGMonitorArrangement(QWidget *parent)
  45   : QWidget(parent)
  46 {
  47     m_pBGMonitor.resize( QApplication::desktop()->numScreens());
  48
  49     for (int screen = 0; screen < QApplication::desktop()->numScreens(); ++screen)
  50     {
  51         BGMonitorLabel * label = new BGMonitorLabel(this);
  52         m_pBGMonitor[screen] = label;
  53
  54         connect( label->monitor(), SIGNAL(imageDropped(const QString &)), this, SIGNAL(imageDropped(const QString &)) );
  55     }
  56
  57     parent->setFixedSize(200, 186);
  58     setFixedSize(200, 186);
  59     updateArrangement();
  60 }
  61
  62
  63 BGMonitor * BGMonitorArrangement::monitor( unsigned screen ) const
  64 {
  65     return m_pBGMonitor[screen]->monitor();
  66 }
  67
  68
  69 QRect BGMonitorArrangement::expandToPreview( const QRect &r ) const
  70 {
  71     double scaleX = 200.0 / 151.0;
  72     double scaleY = 186.0 / 115.0;
  73     return QRect( int(r.x()*scaleX), int(r.y()*scaleY), int(r.width()*scaleX), int(r.height()*scaleY) );
  74 }
  75
  76
  77 QSize BGMonitorArrangement::expandToPreview( const QSize &s ) const
  78 {
  79     double scaleX = 200.0 / 151.0;
  80     double scaleY = 186.0 / 115.0;
  81     return QSize( int(s.width()*scaleX), int(s.height()*scaleY) );
  82 }
  83
  84
  85 QPoint BGMonitorArrangement::expandToPreview( const QPoint &p ) const
  86 {
  87     double scaleX = 200.0 / 151.0;
  88     double scaleY = 186.0 / 115.0;
  89     return QPoint( int(p.x()*scaleX), int(p.y()*scaleY) );
  90 }
  91
  92
  93 void BGMonitorArrangement::updateArrangement()
  94 {
  95     // In this function, sizes, etc have a normal value, and their "expanded"
  96     // value. The expanded value is used for setting the size of the monitor
  97     // image that contains the preview of the background. The monitor image
  98     // will set the background preview back to the normal value.
  99
 100     QRect overallGeometry;
 101     for (int screen = 0; screen < QApplication::desktop()->numScreens(); ++screen)
 102         overallGeometry |= QApplication::desktop()->screenGeometry(screen);
 103
 104     QRect expandedOverallGeometry = expandToPreview(overallGeometry);
 105
 106     double scale = qMin(
 107                 double(width()) / double(expandedOverallGeometry.width()),
 108                 double(height()) / double(expandedOverallGeometry.height())
 109                        );
 110
 111     m_combinedPreviewSize = overallGeometry.size() * scale;
 112
 113     m_maxPreviewSize = QSize(0,0);
 114     int previousMax = 0;
 115
 116     for (int screen = 0; screen < QApplication::desktop()->numScreens(); ++screen)
 117     {
 118         QPoint topLeft = (QApplication::desktop()->screenGeometry(screen).topLeft() - overallGeometry.topLeft()) * scale;
 119         QPoint expandedTopLeft = expandToPreview(topLeft);
 120
 121         QSize previewSize = QApplication::desktop()->screenGeometry(screen).size() * scale;
 122         QSize expandedPreviewSize = expandToPreview(previewSize);
 123
 124         if ( (previewSize.width() * previewSize.height()) > previousMax )
 125         {
 126             previousMax = previewSize.width() * previewSize.height();
 127             m_maxPreviewSize = previewSize;
 128         }
 129
 130         m_pBGMonitor[screen]->setPreviewPosition( QRect( topLeft, previewSize ) );
 131         m_pBGMonitor[screen]->setGeometry( QRect( expandedTopLeft, expandedPreviewSize ) );
 132         m_pBGMonitor[screen]->updateMonitorGeometry();
 133     }
 134 }
 135
 136
 137 void BGMonitorArrangement::resizeEvent( QResizeEvent * e )
 138 {
 139     QWidget::resizeEvent(e);
 140     updateArrangement();
 141 }
 142
 143
 144 void BGMonitorArrangement::setPixmap( const QPixmap & pm )
 145 {
 146     for (int screen = 0; screen < m_pBGMonitor.size(); ++screen)
 147     {
 148         QRect position = m_pBGMonitor[screen]->previewPosition();
 149
 150         QPixmap monitorPixmap( position.size());
 151         QPainter p(&monitorPixmap);
 152         p.drawPixmap(0, 0, pm, position.x(), position.y(), position.width(), position.height() );
 153         m_pBGMonitor[screen]->monitor()->setPixmap(monitorPixmap);
 154     }
 155 }
 156 //END class BGMonitorArrangement
 157
 158
 159
 160 //BEGIN class BGMonitorLabel
 161 BGMonitorLabel::BGMonitorLabel(QWidget *parent, const char *name)
 162     : QLabel(parent)
 163 {
 164     setObjectName( name );
 165     setAlignment(Qt::AlignCenter);
 166     setScaledContents(true);
 167     setPixmap( QPixmap( KStandardDirs::locate("data",  "kcontrol/pics/monitor.png") ) );
 168     m_pBGMonitor = new BGMonitor(this);
 169     setWhatsThis( i18n("This picture of a monitor contains a preview of what the current settings will look like on your desktop.") );
 170 }
 171
 172
 173 void BGMonitorLabel::updateMonitorGeometry()
 174 {
 175     double scaleX = double(width()) / double(sizeHint().width());
 176     double scaleY = double(height()) / double(sizeHint().height());
 177
 178     kDebug() << " Setting geometry to " << QRect( int(23*scaleX), int(14*scaleY), int(151*scaleX), int(115*scaleY) );
 179     m_pBGMonitor->setGeometry( int(23*scaleX), int(14*scaleY), int(151*scaleX), int(115*scaleY) );
 180 }
 181
 182
 183 void BGMonitorLabel::resizeEvent( QResizeEvent * e )
 184 {
 185     QWidget::resizeEvent(e);
 186     updateMonitorGeometry();
 187 }
 188 //END class BGMonitorLabel
 189
 190
 191
 192 //BEGIN class BGMonitor
 193 BGMonitor::BGMonitor(QWidget *parent, const char *name)
 194     : QLabel(parent)
 195 {
 196     setObjectName( name );
 197     setAlignment(Qt::AlignCenter);
 198     setScaledContents(true);
 199     setAcceptDrops(true);
 200 }
 201
 202
 203 void BGMonitor::dropEvent(QDropEvent *e)
 204 {
 205     if (!K3URLDrag::canDecode(e))
 206         return;
 207
 208     KUrl::List uris;
 209     if (K3URLDrag::decode(e, uris) && (uris.count() > 0)) {
 210         // TODO: Download remote file
 211         if (uris.first().isLocalFile())
 212            emit imageDropped(uris.first().path());
 213     }
 214 }
 215
 216 void BGMonitor::dragEnterEvent(QDragEnterEvent *e)
 217 {
 218     if (K3URLDrag::canDecode(e))
 219         e->accept(rect());
 220     else
 221         e->ignore(rect());
 222 }
 223 //END class BGMonitor
 224
 225 #include "bgmonitor.moc"