kstars/kstars/imageviewer.cpp

   1 /***************************************************************************
   2                           imageviewer.cpp  -  An ImageViewer for KStars
   3                              -------------------
   4     begin                : Mon Aug 27 2001
   5     copyright            : (C) 2001 by Thomas Kabelmann
   6     email                : tk78@gmx.de
   7  ***************************************************************************/
   8
   9 /***************************************************************************
  10  *                                                                         *
  11  *   This program is free software; you can redistribute it and/or modify  *
  12  *   it under the terms of the GNU General Public License as published by  *
  13  *   the Free Software Foundation; either version 2 of the License, or     *
  14  *   (at your option) any later version.                                   *
  15  *                                                                         *
  16  ***************************************************************************/
  17
  18 #include <qfont.h>
  19
  20 #include <klocale.h>
  21 #include <kmessagebox.h>
  22 #include <kfiledialog.h>
  23 #include <kstatusbar.h>
  24 #include <kio/netaccess.h>
  25 #include <kaction.h>
  26 #include <kaccel.h>
  27 #include <kdebug.h>
  28 #include "imageviewer.h"
  29
  30 #include <kapplication.h>
  31
  32 ImageViewer::ImageViewer (const KURL *url, const QString &capText, QWidget *parent, const char *name)
  33         : KMainWindow (parent, name), imageURL (*url), fileIsImage (false),
  34           ctrl (false), key_s (false), key_q (false), downloadJob(0)
  35 {
  36 // toolbar can dock only on top-position and can't be minimized
  37 // JH: easier to just disable its mobility
  38         toolBar()->setMovingEnabled( false );
  39
  40         KAction *action = new KAction (i18n ("Close Window"), "fileclose", CTRL+Key_Q, this, SLOT (close()), actionCollection());
  41         action->plug (toolBar());
  42         action = new KAction (i18n ("Save Image"), "filesave", CTRL+Key_S, this, SLOT (saveFileToDisc()), actionCollection());
  43         action->plug (toolBar());
  44
  45         statusBar()->insertItem( capText, 0, 1, true );
  46         statusBar()->setItemAlignment( 0, AlignLeft | AlignVCenter );
  47         QFont fnt = statusBar()->font();
  48         fnt.setPointSize( fnt.pointSize() - 2 );
  49         statusBar()->setFont( fnt );
  50
  51         if (!imageURL.isValid())                //check URL
  52                 kdDebug()<<"URL is malformed"<<endl;
  53         setCaption (imageURL.fileName()); // the title of the window
  54         loadImageFromURL();
  55 }
  56
  57 ImageViewer::~ImageViewer() {
  58 // check if download job is running
  59         checkJob();
  60
  61         if (!file->remove())            // if the file was not complete downloaded the suffix is  ".part"
  62         {
  63             kdDebug()<<QString("remove of %1 failed").arg(file->name())<<endl;
  64                 file->setName (file->name() + ".part");         // set new suffix to filename
  65                 kdDebug()<<QString("try to remove %1").arg( file->name())<<endl;
  66                 if (file->remove())
  67                     kdDebug()<<"file removed\n";
  68                 else
  69                     kdDebug()<<"file not removed\n";
  70         }
  71 }
  72
  73 void ImageViewer::paintEvent (QPaintEvent */*ev*/)
  74 {
  75         bitBlt (this, 0, toolBar()->height() + 1, &pix);
  76 }
  77
  78 void ImageViewer::resizeEvent (QResizeEvent */*ev*/)
  79 {
  80         if ( !downloadJob )  // only if image is loaded
  81                 pix = kpix.convertToPixmap ( image.smoothScale ( size().width() , size().height() - toolBar()->height() - statusBar()->height() ) );    // convert QImage to QPixmap (fastest method)
  82
  83         update();
  84 }
  85
  86 void ImageViewer::closeEvent (QCloseEvent *ev)
  87 {
  88         if (ev) // not if closeEvent (0) is called, because segfault
  89                 ev->accept();   // parent-widgets should not get this event, so it will be filtered
  90         this->~ImageViewer();   // destroy the object, so the object can only allocated with operator new, not as a global/local variable
  91 }
  92
  93
  94 void ImageViewer::keyPressEvent (QKeyEvent *ev)
  95 {
  96         ev->accept();  //make sure key press events are captured.
  97         switch (ev->key())
  98         {
  99                 case Key_Control : ctrl = true; break;
 100                 case Key_Q : key_q = true; break;
 101                 case Key_S : key_s = true; break;
 102                 default : ev->ignore();
 103         }
 104         if (ctrl && key_q)
 105                 close();
 106         if (ctrl && key_s)
 107         {
 108                 ctrl = false;
 109                 key_s = false;
 110                 saveFileToDisc();
 111         }
 112 }
 113
 114 void ImageViewer::keyReleaseEvent (QKeyEvent *ev)
 115 {
 116         ev->accept();
 117         switch (ev->key())
 118         {
 119                 case Key_Control : ctrl = false; break;
 120                 case Key_Q : key_q = false; break;
 121                 case Key_S : key_s = false; break;
 122                 default : ev->ignore();
 123         }
 124 }
 125
 126 void ImageViewer::loadImageFromURL()
 127 {
 128         file = tempfile.file();
 129         tempfile.unlink();              // we just need the name and delete the tempfile from disc; if we don't do it, a dialog will be shown
 130         KURL saveURL (file->name());
 131         if (!saveURL.isValid())
 132             kdDebug()<<"tempfile-URL is malformed\n";
 133
 134         downloadJob = KIO::copy (imageURL, saveURL);    // starts the download asynchron
 135         connect (downloadJob, SIGNAL (result (KIO::Job *)), SLOT (downloadReady (KIO::Job *)));
 136 }
 137
 138 void ImageViewer::downloadReady (KIO::Job *job)
 139 {
 140 // set downloadJob to 0, but don't delete it - the job will automatically deleted !!!
 141         downloadJob = 0;
 142
 143         if ( job->error() )
 144         {
 145                 job->showErrorDialog();
 146                 closeEvent (0);
 147                 return;         // exit this function
 148         }
 149
 150         file->close(); // to get the newest informations of the file and not any informations from opening of the file
 151
 152         if ( file->exists() )
 153         {
 154                 showImage();
 155                 return;
 156         }
 157         closeEvent (0);
 158 }
 159
 160 void ImageViewer::showImage()
 161 {
 162         if (!image.load (file->name()))         // if loading failed
 163         {
 164                 QString text = i18n ("Loading of the image %1 failed.");
 165                 KMessageBox::error (this, text.arg (imageURL.prettyURL() ));
 166                 closeEvent (0);
 167                 return;
 168         }
 169         fileIsImage = true;     // we loaded the file and know now, that it is an image
 170
 171         //First, if the image is less wide than the statusBar, we have to scale it up.
 172         if ( image.width() < statusBar()->width() ) {
 173                 image.smoothScale ( statusBar()->width() , image.height() * statusBar()->width() / image.width() );
 174         }
 175
 176         QRect deskRect = kapp->desktop()->availableGeometry();
 177         int w = deskRect.width(); // screen width
 178         int h = deskRect.height(); // screen height
 179         int h2 = image.height() + toolBar()->height() + statusBar()->height(); //height required for ImageViewer
 180         if (image.width() <= w && h2 <= h)
 181                 resize ( image.width(), h2 );
 182
 183 //If the image is larger than screen width and/or screen height, shrink it to fit the screen
 184 //while preserving the original aspect ratio
 185
 186         else if (image.width() <= w) //only the height is too large
 187                 resize ( int( image.width()*h/h2 ), h );
 188         else if (image.height() <= h) //only the width is too large
 189                 resize ( w, int( h2*w/image.width() ) );
 190         else { //uh-oh...both width and height are too large.  which needs to be shrunk least?
 191                 float fx = float(w)/float(image.width());
 192                 float fy = float(h)/float(h2);
 193     if (fx > fy) //width needs to be shrunk less, so shrink to fit in height
 194                         resize ( int( image.width()*fy ), h );
 195                 else //vice versa
 196                         resize ( w, int( h2*fx ) );
 197         }
 198
 199         show(); // hide is default
 200 // pix will be initialized in resizeEvent(), which will automatically called first time
 201 }
 202
 203 void ImageViewer::saveFileToDisc()
 204 {
 205         KURL newURL = KFileDialog::getSaveURL(imageURL.fileName());  // save-dialog with default filename
 206         if (!newURL.isEmpty())
 207         {
 208                 QFile f (newURL.directory() + "/" +  newURL.fileName());
 209                 if (f.exists())
 210                 {
 211                         int r=KMessageBox::warningContinueCancel(static_cast<QWidget *>(parent()),
 212                                                                         i18n( "A file named \"%1\" already exists. "
 213                                                                                         "Overwrite it?" ).arg(newURL.fileName()),
 214                                                                         i18n( "Overwrite File?" ),
 215                                                                         i18n( "&Overwrite" ) );
 216                         if(r==KMessageBox::Cancel) return;
 217
 218                         f.remove();
 219                 }
 220                 saveFile (newURL);
 221         }
 222 }
 223
 224 void ImageViewer::saveFile (KURL &url) {
 225 // synchronous Access to prevent segfaults
 226         if (!KIO::NetAccess::copy (KURL (file->name()), url, (QWidget*) 0))
 227         {
 228                 QString text = i18n ("Saving of the image %1 failed.");
 229                 KMessageBox::error (this, text.arg (url.prettyURL() ));
 230         }
 231 }
 232
 233 void ImageViewer::close() {
 234         closeEvent (0);
 235 }
 236
 237 void ImageViewer::checkJob() {
 238         if ( downloadJob ) {  // if download job is running
 239                 downloadJob->kill( true );  // close job quietly, without emitting a result
 240                 kdDebug() << "Download job killed";
 241         }
 242 }
 243
 244 #include "imageviewer.moc"