runtime/kioslave/thumbnail/htmlcreator.cpp

   1 /*  This file is part of the KDE libraries
   2     Copyright (C) 2000 Malte Starostik <malte@kde.org>
   3     Copyright (C) 2006 Roberto Cappuccio <roberto.cappuccio@gmail.com>
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9
  10     This library is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13     Library General Public License for more details.
  14
  15     You should have received a copy of the GNU Library General Public License
  16     along with this library; see the file COPYING.LIB.  If not, write to
  17     the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18     Boston, MA 02110-1301, USA.
  19 */
  20
  21 #include "htmlcreator.h"
  22
  23 #include <time.h>
  24
  25 #include <QPixmap>
  26 #include <QImage>
  27 #include <QPainter>
  28
  29 #include <kapplication.h>
  30 #include <khtml_part.h>
  31
  32 extern "C"
  33 {
  34     KDE_EXPORT ThumbCreator *new_creator()
  35     {
  36         return new HTMLCreator;
  37     }
  38 }
  39
  40 HTMLCreator::HTMLCreator()
  41     : m_html(0)
  42 {
  43 }
  44
  45 HTMLCreator::~HTMLCreator()
  46 {
  47     delete m_html;
  48 }
  49
  50 bool HTMLCreator::create(const QString &path, int width, int height, QImage &img)
  51 {
  52     if (!m_html)
  53     {
  54         m_html = new KHTMLPart;
  55         connect(m_html, SIGNAL(completed()), SLOT(slotCompleted()));
  56         m_html->setJScriptEnabled(false);
  57         m_html->setJavaEnabled(false);
  58         m_html->setPluginsEnabled(false);
  59         m_html->setMetaRefreshEnabled(false);
  60         m_html->setOnlyLocalReferences(true);
  61     }
  62     KUrl url;
  63     url.setPath(path);
  64     m_html->openUrl(url);
  65
  66     int t = startTimer(5000);
  67
  68     m_eventLoop.exec(QEventLoop::ExcludeUserInputEvents);
  69
  70     killTimer(t);
  71
  72     // render the HTML page on a bigger pixmap and use smoothScale,
  73     // looks better than directly scaling with the QPainter (malte)
  74     QPixmap pix;
  75     if (width > 400 || height > 600)
  76     {
  77         if (height * 3 > width * 4)
  78             pix = QPixmap(width, width * 4 / 3);
  79         else
  80             pix = QPixmap(height * 3 / 4, height);
  81     }
  82     else
  83         pix = QPixmap(400, 600);
  84
  85     // light-grey background, in case loadind the page failed
  86     pix.fill( QColor( 245, 245, 245 ) );
  87
  88     int borderX = pix.width() / width,
  89         borderY = pix.height() / height;
  90     QRect rc(borderX, borderY, pix.width() - borderX * 2, pix.height() - borderY * 2);
  91
  92     QPainter p;
  93     p.begin(&pix);
  94     m_html->paint(&p, rc);
  95     p.end();
  96
  97     img = pix.toImage();
  98
  99     m_html->closeUrl();
 100
 101     return true;
 102 }
 103
 104 void HTMLCreator::timerEvent(QTimerEvent *)
 105 {
 106     m_eventLoop.quit();
 107 }
 108
 109 void HTMLCreator::slotCompleted()
 110 {
 111     m_eventLoop.quit();
 112 }
 113
 114 ThumbCreator::Flags HTMLCreator::flags() const
 115 {
 116     return DrawFrame;
 117 }
 118
 119 #include "htmlcreator.moc"
 120