ThumbnailView/ThumbnailToolTip.cpp

   1 /* Copyright (C) 2003-2009 Jesper K. Pedersen <blackie@kde.org>
   2
   3    This program is free software; you can redistribute it and/or
   4    modify it under the terms of the GNU General Public
   5    License as published by the Free Software Foundation; either
   6    version 2 of the License, or (at your option) any later version.
   7
   8    This program is distributed in the hope that it will be useful,
   9    but WITHOUT ANY WARRANTY; without even the implied warranty of
  10    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11    General Public License for more details.
  12
  13    You should have received a copy of the GNU General Public License
  14    along with this program; see the file COPYING.  If not, write to
  15    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  16    Boston, MA 02110-1301, USA.
  17 */
  18
  19 #include "ThumbnailToolTip.h"
  20
  21 #include <QDesktopWidget>
  22 #include <QTemporaryFile>
  23 #include <QApplication>
  24 #include <QCursor>
  25
  26 #include "DB/ImageDB.h"
  27 #include "DB/ImageInfo.h"
  28 #include "ImageManager/Manager.h"
  29 #include "Settings/SettingsData.h"
  30 #include "ThumbnailWidget.h"
  31 #include "Utilities/Util.h"
  32
  33 QTemporaryFile* _tmpFileForThumbnailView = 0;
  34
  35 /**
  36    \class ThumbnailToolTip
  37    This class takes care of showing tooltips for the individual items in the thumbnail view.
  38    I tried implementing this with QToolTip::maybeTip() on the iconview, but it had the
  39    disadvantages that either the tooltip would not follow the
  40    mouse( and would therefore stand on top of the image), or it flickered.
  41 */
  42
  43 ThumbnailView::ThumbnailToolTip::ThumbnailToolTip( ThumbnailWidget* view )
  44     : QLabel( view, Qt::WStyle_Customize | Qt::WStyle_NoBorder | Qt::WType_TopLevel
  45               | Qt::WX11BypassWM
  46               | Qt::WStyle_Tool ), _view( view ),
  47       _widthInverse( false ), _heightInverse( false )
  48 {
  49     setAlignment( Qt::AlignLeft | Qt::AlignTop );
  50     setFrameStyle( Q3Frame::Box | Q3Frame::Plain );
  51     setLineWidth(1);
  52     setMargin(1);
  53
  54     setWindowOpacity(0.8);
  55     setAutoFillBackground(true);
  56     QPalette p = palette();
  57     p.setColor(QPalette::Background, QColor(0,0,0,170)); // r,g,b,A
  58     p.setColor(QPalette::WindowText, Qt::white );
  59     setPalette(p);
  60 }
  61
  62 bool ThumbnailView::ThumbnailToolTip::eventFilter( QObject* o , QEvent* event )
  63 {
  64     if ( o == _view->viewport() && event->type() == QEvent::Leave )
  65         hide();
  66
  67     else if ( event->type() == QEvent::MouseMove )
  68         showToolTips( false );
  69     return false;
  70 }
  71
  72 void ThumbnailView::ThumbnailToolTip::showToolTips( bool force )
  73 {
  74     DB::ResultId id = _view->mediaIdUnderCursor();
  75     if ( id.isNull() )
  76         return;
  77
  78     QString fileName = id.fetchInfo()->fileName(DB::AbsolutePath);
  79     if ( force || (fileName != _currentFileName) ) {
  80         if ( loadImage( fileName ) ) {
  81             setText( QString() );
  82             int size = Settings::SettingsData::instance()->previewSize();
  83             if ( size != 0 ) {
  84                 setText( QString::fromLatin1("<table cols=\"2\" cellpadding=\"10\"><tr><td><img src=\"%1\"></td><td>%2</td></tr>")
  85                          .arg(_tmpFileForThumbnailView->fileName()).
  86                          arg(Utilities::createInfoText( DB::ImageDB::instance()->info( fileName, DB::AbsolutePath ), 0 ) ) );
  87             }
  88             else {
  89                 setText( QString::fromLatin1("<p>%1</p>").arg( Utilities::createInfoText( DB::ImageDB::instance()->info( fileName, DB::AbsolutePath ), 0 ) ) );
  90             }
  91             setWordWrap( true );
  92         }
  93
  94         _currentFileName = fileName;
  95         resize( sizeHint() );
  96         _view->setFocus();
  97     }
  98
  99     placeWindow();
 100     show();
 101 }
 102
 103
 104 void ThumbnailView::ThumbnailToolTip::setActive( bool b )
 105 {
 106     if ( b ) {
 107         showToolTips(true);
 108         _view->viewport()->installEventFilter( this );
 109         show();
 110     }
 111     else {
 112         _view->viewport()->removeEventFilter( this );
 113         hide();
 114     }
 115 }
 116
 117 void ThumbnailView::ThumbnailToolTip::placeWindow()
 118 {
 119 // First try to set the position.
 120     QPoint pos = QCursor::pos() + QPoint( 20, 20 );
 121     if ( _widthInverse )
 122         pos.setX( pos.x() - 30 - width() );
 123     if ( _heightInverse )
 124         pos.setY( pos.y() - 30 - height() );
 125
 126     QRect geom = qApp->desktop()->screenGeometry( QCursor::pos() );
 127
 128     // Now test whether the window moved outside the screen
 129     if ( _widthInverse ) {
 130         if ( pos.x() <  geom.x() ) {
 131             pos.setX( QCursor::pos().x() + 20 );
 132             _widthInverse = false;
 133         }
 134     }
 135     else {
 136         if ( pos.x() + width() > geom.right() ) {
 137             pos.setX( QCursor::pos().x() - width() );
 138             _widthInverse = true;
 139         }
 140     }
 141
 142     if ( _heightInverse ) {
 143         if ( pos.y() < geom.y()  ) {
 144             pos.setY( QCursor::pos().y() + 10 );
 145             _heightInverse = false;
 146         }
 147     }
 148     else {
 149         if ( pos.y() + height() > geom.bottom() ) {
 150             pos.setY( QCursor::pos().y() - 10 - height() );
 151             _heightInverse = true;
 152         }
 153     }
 154
 155     move( pos );
 156 }
 157
 158
 159 bool ThumbnailView::ThumbnailToolTip::loadImage( const QString& fileName )
 160 {
 161     int size = Settings::SettingsData::instance()->previewSize();
 162     DB::ImageInfoPtr info = DB::ImageDB::instance()->info( fileName, DB::AbsolutePath );
 163     if ( size != 0 ) {
 164         if ( fileName != _currentFileName ) {
 165             ImageManager::ImageRequest* request = new ImageManager::ImageRequest( fileName, QSize( size, size ), info->angle(), this );
 166             // request->setCache();  // TODO: do caching in callback.
 167             request->setPriority( ImageManager::Viewer );
 168             ImageManager::Manager::instance()->load( request );
 169             return false;
 170         }
 171     }
 172     return true;
 173 }
 174
 175 void ThumbnailView::ThumbnailToolTip::pixmapLoaded( const QString& fileName, const QSize& /*size*/,
 176                                                     const QSize& /*fullSize*/, int /*angle*/, const QImage& image, const bool /*loadedOK*/)
 177 {
 178     delete _tmpFileForThumbnailView;
 179     _tmpFileForThumbnailView = new QTemporaryFile(this);
 180     _tmpFileForThumbnailView->open();
 181
 182     image.save(_tmpFileForThumbnailView, "PNG" );
 183     if ( fileName == _currentFileName )
 184         showToolTips(true);
 185 }
 186
 187 #include "ThumbnailToolTip.moc"