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<h1 class="title">mainwindow.cpp Example File</h1>
<span class="small-subtitle">network/torrent/mainwindow.cpp</span>
<!-- $$$network/torrent/mainwindow.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** &quot;Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/</span>

 <span class="preprocessor">#include &lt;QtGui&gt;</span>

 <span class="preprocessor">#include &quot;addtorrentdialog.h&quot;</span>
 <span class="preprocessor">#include &quot;mainwindow.h&quot;</span>
 <span class="preprocessor">#include &quot;ratecontroller.h&quot;</span>
 <span class="preprocessor">#include &quot;torrentclient.h&quot;</span>

 <span class="comment">// TorrentView extends QTreeWidget to allow drag and drop.</span>
 <span class="keyword">class</span> TorrentView : <span class="keyword">public</span> <span class="type"><a href="qtreewidget.html">QTreeWidget</a></span>
 {
     Q_OBJECT
 <span class="keyword">public</span>:
     TorrentView(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent <span class="operator">=</span> <span class="number">0</span>);

 <span class="keyword">signals</span>:
     <span class="type">void</span> fileDropped(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName);

 <span class="keyword">protected</span>:
     <span class="type">void</span> dragMoveEvent(<span class="type"><a href="qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event);
     <span class="type">void</span> dropEvent(<span class="type"><a href="qdropevent.html">QDropEvent</a></span> <span class="operator">*</span>event);
 };

 <span class="comment">// TorrentViewDelegate is used to draw the progress bars.</span>
 <span class="keyword">class</span> TorrentViewDelegate : <span class="keyword">public</span> <span class="type"><a href="qitemdelegate.html">QItemDelegate</a></span>
 {
     Q_OBJECT
 <span class="keyword">public</span>:
     <span class="keyword">inline</span> TorrentViewDelegate(MainWindow <span class="operator">*</span>mainWindow) : <span class="type"><a href="qitemdelegate.html">QItemDelegate</a></span>(mainWindow) {}

     <span class="keyword">inline</span> <span class="type">void</span> paint(<span class="type"><a href="qpainter.html">QPainter</a></span> <span class="operator">*</span>painter<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstyleoptionviewitem.html">QStyleOptionViewItem</a></span> <span class="operator">&amp;</span>option<span class="operator">,</span>
                       <span class="keyword">const</span> <span class="type"><a href="qmodelindex.html">QModelIndex</a></span> <span class="operator">&amp;</span>index ) <span class="keyword">const</span>
     {
         <span class="keyword">if</span> (index<span class="operator">.</span>column() <span class="operator">!</span><span class="operator">=</span> <span class="number">2</span>) {
             <span class="type"><a href="qitemdelegate.html">QItemDelegate</a></span><span class="operator">::</span>paint(painter<span class="operator">,</span> option<span class="operator">,</span> index);
             <span class="keyword">return</span>;
         }

         <span class="comment">// Set up a QStyleOptionProgressBar to precisely mimic the</span>
         <span class="comment">// environment of a progress bar.</span>
         <span class="type"><a href="qstyleoptionprogressbar.html">QStyleOptionProgressBar</a></span> progressBarOption;
         progressBarOption<span class="operator">.</span>state <span class="operator">=</span> <span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>State_Enabled;
         progressBarOption<span class="operator">.</span>direction <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>layoutDirection();
         progressBarOption<span class="operator">.</span>rect <span class="operator">=</span> option<span class="operator">.</span>rect;
         progressBarOption<span class="operator">.</span>fontMetrics <span class="operator">=</span> <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>fontMetrics();
         progressBarOption<span class="operator">.</span>minimum <span class="operator">=</span> <span class="number">0</span>;
         progressBarOption<span class="operator">.</span>maximum <span class="operator">=</span> <span class="number">100</span>;
         progressBarOption<span class="operator">.</span>textAlignment <span class="operator">=</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignCenter;
         progressBarOption<span class="operator">.</span>textVisible <span class="operator">=</span> <span class="keyword">true</span>;

         <span class="comment">// Set the progress and text values of the style option.</span>
         <span class="type">int</span> progress <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>MainWindow <span class="operator">*</span><span class="operator">&gt;</span>(parent())<span class="operator">-</span><span class="operator">&gt;</span>clientForRow(index<span class="operator">.</span>row())<span class="operator">-</span><span class="operator">&gt;</span>progress();
         progressBarOption<span class="operator">.</span>progress <span class="operator">=</span> progress <span class="operator">&lt;</span> <span class="number">0</span> <span class="operator">?</span> <span class="number">0</span> : progress;
         progressBarOption<span class="operator">.</span>text <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">.</span>sprintf(<span class="string">&quot;%d%%&quot;</span><span class="operator">,</span> progressBarOption<span class="operator">.</span>progress);

         <span class="comment">// Draw the progress bar onto the view.</span>
         <span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>style()<span class="operator">-</span><span class="operator">&gt;</span>drawControl(<span class="type"><a href="qstyle.html">QStyle</a></span><span class="operator">::</span>CE_ProgressBar<span class="operator">,</span> <span class="operator">&amp;</span>progressBarOption<span class="operator">,</span> painter);
     }
 };

 MainWindow<span class="operator">::</span>MainWindow(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
     : <span class="type"><a href="qmainwindow.html">QMainWindow</a></span>(parent)<span class="operator">,</span> quitDialog(<span class="number">0</span>)<span class="operator">,</span> saveChanges(<span class="keyword">false</span>)
 {
     <span class="comment">// Initialize some static strings</span>
     <span class="type"><a href="qstringlist.html">QStringList</a></span> headers;
     headers <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Torrent&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Peers/Seeds&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Progress&quot;</span>)
             <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Down rate&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Up rate&quot;</span>) <span class="operator">&lt;</span><span class="operator">&lt;</span> tr(<span class="string">&quot;Status&quot;</span>);

     <span class="comment">// Main torrent list</span>
     torrentView <span class="operator">=</span> <span class="keyword">new</span> TorrentView(<span class="keyword">this</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>setItemDelegate(<span class="keyword">new</span> TorrentViewDelegate(<span class="keyword">this</span>));
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>setHeaderLabels(headers);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>setSelectionBehavior(<span class="type"><a href="qabstractitemview.html">QAbstractItemView</a></span><span class="operator">::</span>SelectRows);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>setAlternatingRowColors(<span class="keyword">true</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>setRootIsDecorated(<span class="keyword">false</span>);
     setCentralWidget(torrentView);

     <span class="comment">// Set header resize modes and initial section sizes</span>
     <span class="type"><a href="qfontmetrics.html">QFontMetrics</a></span> fm <span class="operator">=</span> fontMetrics();
     <span class="type"><a href="qheaderview.html">QHeaderView</a></span> <span class="operator">*</span>header <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>header();
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">0</span><span class="operator">,</span> fm<span class="operator">.</span>width(<span class="string">&quot;typical-name-for-a-torrent.torrent&quot;</span>));
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">1</span><span class="operator">,</span> fm<span class="operator">.</span>width(headers<span class="operator">.</span>at(<span class="number">1</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>));
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">2</span><span class="operator">,</span> fm<span class="operator">.</span>width(headers<span class="operator">.</span>at(<span class="number">2</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>));
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">3</span><span class="operator">,</span> <a href="qtglobal.html#qMax">qMax</a>(fm<span class="operator">.</span>width(headers<span class="operator">.</span>at(<span class="number">3</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>)<span class="operator">,</span> fm<span class="operator">.</span>width(<span class="string">&quot; 1234.0 KB/s &quot;</span>)));
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">4</span><span class="operator">,</span> <a href="qtglobal.html#qMax">qMax</a>(fm<span class="operator">.</span>width(headers<span class="operator">.</span>at(<span class="number">4</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>)<span class="operator">,</span> fm<span class="operator">.</span>width(<span class="string">&quot; 1234.0 KB/s &quot;</span>)));
     header<span class="operator">-</span><span class="operator">&gt;</span>resizeSection(<span class="number">5</span><span class="operator">,</span> <a href="qtglobal.html#qMax">qMax</a>(fm<span class="operator">.</span>width(headers<span class="operator">.</span>at(<span class="number">5</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>)<span class="operator">,</span> fm<span class="operator">.</span>width(tr(<span class="string">&quot;Downloading&quot;</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>)));

     <span class="comment">// Create common actions</span>
     <span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>newTorrentAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/bottom.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Add &amp;new torrent&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     pauseTorrentAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/player_pause.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Pause torrent&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
     removeTorrentAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/player_stop.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;&amp;Remove torrent&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);

     <span class="comment">// File menu</span>
     <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>fileMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;File&quot;</span>));
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(newTorrentAction);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(pauseTorrentAction);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(removeTorrentAction);
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     fileMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/exit.png&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;E&amp;xit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));

     <span class="comment">// Help menu</span>
     <span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>helpMenu <span class="operator">=</span> menuBar()<span class="operator">-</span><span class="operator">&gt;</span>addMenu(tr(<span class="string">&quot;&amp;Help&quot;</span>));
     helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;&amp;About&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(about()));
     helpMenu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;About &amp;Qt&quot;</span>)<span class="operator">,</span> qApp<span class="operator">,</span> SLOT(aboutQt()));

     <span class="comment">// Top toolbar</span>
     <span class="type"><a href="qtoolbar.html">QToolBar</a></span> <span class="operator">*</span>topBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbar.html">QToolBar</a></span>(tr(<span class="string">&quot;Tools&quot;</span>));
     addToolBar(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>TopToolBarArea<span class="operator">,</span> topBar);
     topBar<span class="operator">-</span><span class="operator">&gt;</span>setMovable(<span class="keyword">false</span>);
     topBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(newTorrentAction);
     topBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(removeTorrentAction);
     topBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(pauseTorrentAction);
     topBar<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     downActionTool <span class="operator">=</span> topBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(<span class="type"><a href="qicon.html">QIcon</a></span>(tr(<span class="string">&quot;:/icons/1downarrow.png&quot;</span>))<span class="operator">,</span> tr(<span class="string">&quot;Move down&quot;</span>));
     upActionTool <span class="operator">=</span> topBar<span class="operator">-</span><span class="operator">&gt;</span>addAction(<span class="type"><a href="qicon.html">QIcon</a></span>(tr(<span class="string">&quot;:/icons/1uparrow.png&quot;</span>))<span class="operator">,</span> tr(<span class="string">&quot;Move up&quot;</span>));

     <span class="comment">// Bottom toolbar</span>
     <span class="type"><a href="qtoolbar.html">QToolBar</a></span> <span class="operator">*</span>bottomBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtoolbar.html">QToolBar</a></span>(tr(<span class="string">&quot;Rate control&quot;</span>));
     addToolBar(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>BottomToolBarArea<span class="operator">,</span> bottomBar);
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>setMovable(<span class="keyword">false</span>);
     downloadLimitSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
     downloadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">1000</span>);
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget(<span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Max download:&quot;</span>)));
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget(downloadLimitSlider);
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget((downloadLimitLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;0 KB/s&quot;</span>))));
     downloadLimitLabel<span class="operator">-</span><span class="operator">&gt;</span>setFixedSize(<span class="type"><a href="qsize.html">QSize</a></span>(fm<span class="operator">.</span>width(tr(<span class="string">&quot;99999 KB/s&quot;</span>))<span class="operator">,</span> fm<span class="operator">.</span>lineSpacing()));
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addSeparator();
     uploadLimitSlider <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qslider.html">QSlider</a></span>(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>Horizontal);
     uploadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>setRange(<span class="number">0</span><span class="operator">,</span> <span class="number">1000</span>);
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget(<span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Max upload:&quot;</span>)));
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget(uploadLimitSlider);
     bottomBar<span class="operator">-</span><span class="operator">&gt;</span>addWidget((uploadLimitLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;0 KB/s&quot;</span>))));
     uploadLimitLabel<span class="operator">-</span><span class="operator">&gt;</span>setFixedSize(<span class="type"><a href="qsize.html">QSize</a></span>(fm<span class="operator">.</span>width(tr(<span class="string">&quot;99999 KB/s&quot;</span>))<span class="operator">,</span> fm<span class="operator">.</span>lineSpacing()));

     <span class="comment">// Set up connections</span>
     connect(torrentView<span class="operator">,</span> SIGNAL(itemSelectionChanged())<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(setActionsEnabled()));
     connect(torrentView<span class="operator">,</span> SIGNAL(fileDropped(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(acceptFileDrop(<span class="type"><a href="qstring.html">QString</a></span>)));
     connect(uploadLimitSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(setUploadLimit(<span class="type">int</span>)));
     connect(downloadLimitSlider<span class="operator">,</span> SIGNAL(valueChanged(<span class="type">int</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(setDownloadLimit(<span class="type">int</span>)));
     connect(newTorrentAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(addTorrent()));
     connect(pauseTorrentAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(pauseTorrent()));
     connect(removeTorrentAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(removeTorrent()));
     connect(upActionTool<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(moveTorrentUp()));
     connect(downActionTool<span class="operator">,</span> SIGNAL(triggered(<span class="type">bool</span>))<span class="operator">,</span>
             <span class="keyword">this</span><span class="operator">,</span> SLOT(moveTorrentDown()));

     <span class="comment">// Load settings and start</span>
     setWindowTitle(tr(<span class="string">&quot;Torrent Client&quot;</span>));
     setActionsEnabled();
     <span class="type"><a href="qmetaobject.html">QMetaObject</a></span><span class="operator">::</span>invokeMethod(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;loadSettings&quot;</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>QueuedConnection);
 }

 <span class="type"><a href="qsize.html">QSize</a></span> MainWindow<span class="operator">::</span>sizeHint() <span class="keyword">const</span>
 {
     <span class="keyword">const</span> <span class="type"><a href="qheaderview.html">QHeaderView</a></span> <span class="operator">*</span>header <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>header();

     <span class="comment">// Add up the sizes of all header sections. The last section is</span>
     <span class="comment">// stretched, so its size is relative to the size of the width;</span>
     <span class="comment">// instead of counting it, we count the size of its largest value.</span>
     <span class="type">int</span> width <span class="operator">=</span> fontMetrics()<span class="operator">.</span>width(tr(<span class="string">&quot;Downloading&quot;</span>) <span class="operator">+</span> <span class="string">&quot;  &quot;</span>);
     <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> header<span class="operator">-</span><span class="operator">&gt;</span>count() <span class="operator">-</span> <span class="number">1</span>; <span class="operator">+</span><span class="operator">+</span>i)
         width <span class="operator">+</span><span class="operator">=</span> header<span class="operator">-</span><span class="operator">&gt;</span>sectionSize(i);

     <span class="keyword">return</span> <span class="type"><a href="qsize.html">QSize</a></span>(width<span class="operator">,</span> <span class="type"><a href="qmainwindow.html">QMainWindow</a></span><span class="operator">::</span>sizeHint()<span class="operator">.</span>height())
         <span class="operator">.</span>expandedTo(<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>globalStrut());
 }

 <span class="keyword">const</span> TorrentClient <span class="operator">*</span>MainWindow<span class="operator">::</span>clientForRow(<span class="type">int</span> row) <span class="keyword">const</span>
 {
     <span class="comment">// Return the client at the given row.</span>
     <span class="keyword">return</span> jobs<span class="operator">.</span>at(row)<span class="operator">.</span>client;
 }

 <span class="type">int</span> MainWindow<span class="operator">::</span>rowOfClient(TorrentClient <span class="operator">*</span>client) <span class="keyword">const</span>
 {
     <span class="comment">// Return the row that displays this client's status, or -1 if the</span>
     <span class="comment">// client is not known.</span>
     <span class="type">int</span> row <span class="operator">=</span> <span class="number">0</span>;
     foreach (Job job<span class="operator">,</span> jobs) {
         <span class="keyword">if</span> (job<span class="operator">.</span>client <span class="operator">=</span><span class="operator">=</span> client)
             <span class="keyword">return</span> row;
         <span class="operator">+</span><span class="operator">+</span>row;
     }
     <span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>loadSettings()
 {
     <span class="comment">// Load base settings (last working directory, upload/download limits).</span>
     <span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="string">&quot;Trolltech&quot;</span><span class="operator">,</span> <span class="string">&quot;Torrent&quot;</span>);
     lastDirectory <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;LastDirectory&quot;</span>)<span class="operator">.</span>toString();
     <span class="keyword">if</span> (lastDirectory<span class="operator">.</span>isEmpty())
         lastDirectory <span class="operator">=</span> <span class="type"><a href="qdir.html">QDir</a></span><span class="operator">::</span>currentPath();
     <span class="type">int</span> up <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;UploadLimit&quot;</span>)<span class="operator">.</span>toInt();
     <span class="type">int</span> down <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;DownloadLimit&quot;</span>)<span class="operator">.</span>toInt();
     uploadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(up <span class="operator">?</span> up : <span class="number">170</span>);
     downloadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>setValue(down <span class="operator">?</span> down : <span class="number">550</span>);

     <span class="comment">// Resume all previous downloads.</span>
     <span class="type">int</span> size <span class="operator">=</span> settings<span class="operator">.</span>beginReadArray(<span class="string">&quot;Torrents&quot;</span>);
     <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> size; <span class="operator">+</span><span class="operator">+</span>i) {
         settings<span class="operator">.</span>setArrayIndex(i);
         <span class="type"><a href="qbytearray.html">QByteArray</a></span> resumeState <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;resumeState&quot;</span>)<span class="operator">.</span>toByteArray();
         <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;sourceFileName&quot;</span>)<span class="operator">.</span>toString();
         <span class="type"><a href="qstring.html">QString</a></span> dest <span class="operator">=</span> settings<span class="operator">.</span>value(<span class="string">&quot;destinationFolder&quot;</span>)<span class="operator">.</span>toString();

         <span class="keyword">if</span> (addTorrent(fileName<span class="operator">,</span> dest<span class="operator">,</span> resumeState)) {
             TorrentClient <span class="operator">*</span>client <span class="operator">=</span> jobs<span class="operator">.</span>last()<span class="operator">.</span>client;
             client<span class="operator">-</span><span class="operator">&gt;</span>setDownloadedBytes(settings<span class="operator">.</span>value(<span class="string">&quot;downloadedBytes&quot;</span>)<span class="operator">.</span>toLongLong());
             client<span class="operator">-</span><span class="operator">&gt;</span>setUploadedBytes(settings<span class="operator">.</span>value(<span class="string">&quot;uploadedBytes&quot;</span>)<span class="operator">.</span>toLongLong());
         }
     }
 }

 <span class="type">bool</span> MainWindow<span class="operator">::</span>addTorrent()
 {
     <span class="comment">// Show the file dialog, let the user select what torrent to start downloading.</span>
     <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qfiledialog.html">QFileDialog</a></span><span class="operator">::</span>getOpenFileName(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Choose a torrent file&quot;</span>)<span class="operator">,</span>
                                                     lastDirectory<span class="operator">,</span>
                                                     tr(<span class="string">&quot;Torrents (*.torrent);;&quot;</span>
                                                        <span class="string">&quot; All files (*.*)&quot;</span>));
     <span class="keyword">if</span> (fileName<span class="operator">.</span>isEmpty())
         <span class="keyword">return</span> <span class="keyword">false</span>;
     lastDirectory <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>absolutePath();

     <span class="comment">// Show the &quot;Add Torrent&quot; dialog.</span>
     AddTorrentDialog <span class="operator">*</span>addTorrentDialog <span class="operator">=</span> <span class="keyword">new</span> AddTorrentDialog(<span class="keyword">this</span>);
     addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>setTorrent(fileName);
     addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
     <span class="keyword">if</span> (<span class="operator">!</span>addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>exec())
         <span class="keyword">return</span> <span class="keyword">false</span>;

     <span class="comment">// Add the torrent to our list of downloads</span>
     addTorrent(fileName<span class="operator">,</span> addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>destinationFolder());
     <span class="keyword">if</span> (<span class="operator">!</span>saveChanges) {
         saveChanges <span class="operator">=</span> <span class="keyword">true</span>;
         <span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">1000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveSettings()));
     }
     <span class="keyword">return</span> <span class="keyword">true</span>;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>removeTorrent()
 {
     <span class="comment">// Find the row of the current item, and find the torrent client</span>
     <span class="comment">// for that row.</span>
     <span class="type">int</span> row <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(torrentView<span class="operator">-</span><span class="operator">&gt;</span>currentItem());
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> jobs<span class="operator">.</span>at(row)<span class="operator">.</span>client;

     <span class="comment">// Stop the client.</span>
     client<span class="operator">-</span><span class="operator">&gt;</span>disconnect();
     connect(client<span class="operator">,</span> SIGNAL(stopped())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(torrentStopped()));
     client<span class="operator">-</span><span class="operator">&gt;</span>stop();

     <span class="comment">// Remove the row from the view.</span>
     <span class="keyword">delete</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>takeTopLevelItem(row);
     jobs<span class="operator">.</span>removeAt(row);
     setActionsEnabled();

     saveChanges <span class="operator">=</span> <span class="keyword">true</span>;
     saveSettings();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>torrentStopped()
 {
     <span class="comment">// Schedule the client for deletion.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     client<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();

     <span class="comment">// If the quit dialog is shown, update its progress.</span>
     <span class="keyword">if</span> (quitDialog) {
         <span class="keyword">if</span> (<span class="operator">+</span><span class="operator">+</span>jobsStopped <span class="operator">=</span><span class="operator">=</span> jobsToStop)
             quitDialog<span class="operator">-</span><span class="operator">&gt;</span>close();
     }
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>torrentError(TorrentClient<span class="operator">::</span>Error)
 {
     <span class="comment">// Delete the client.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);
     <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> jobs<span class="operator">.</span>at(row)<span class="operator">.</span>torrentFileName;
     jobs<span class="operator">.</span>removeAt(row);

     <span class="comment">// Display the warning.</span>
     <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Error&quot;</span>)<span class="operator">,</span>
                          tr(<span class="string">&quot;An error occurred while downloading %0: %1&quot;</span>)
                          <span class="operator">.</span>arg(fileName)
                          <span class="operator">.</span>arg(client<span class="operator">-</span><span class="operator">&gt;</span>errorString()));

     <span class="keyword">delete</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>takeTopLevelItem(row);
     client<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
 }

 <span class="type">bool</span> MainWindow<span class="operator">::</span>addTorrent(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>destinationFolder<span class="operator">,</span>
                             <span class="keyword">const</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span> <span class="operator">&amp;</span>resumeState)
 {
     <span class="comment">// Check if the torrent is already being downloaded.</span>
     foreach (Job job<span class="operator">,</span> jobs) {
         <span class="keyword">if</span> (job<span class="operator">.</span>torrentFileName <span class="operator">=</span><span class="operator">=</span> fileName <span class="operator">&amp;</span><span class="operator">&amp;</span> job<span class="operator">.</span>destinationDirectory <span class="operator">=</span><span class="operator">=</span> destinationFolder) {
             <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Already downloading&quot;</span>)<span class="operator">,</span>
                                  tr(<span class="string">&quot;The torrent file %1 is &quot;</span>
                                     <span class="string">&quot;already being downloaded.&quot;</span>)<span class="operator">.</span>arg(fileName));
             <span class="keyword">return</span> <span class="keyword">false</span>;
         }
     }

     <span class="comment">// Create a new torrent client and attempt to parse the torrent data.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> <span class="keyword">new</span> TorrentClient(<span class="keyword">this</span>);
     <span class="keyword">if</span> (<span class="operator">!</span>client<span class="operator">-</span><span class="operator">&gt;</span>setTorrent(fileName)) {
         <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>warning(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Error&quot;</span>)<span class="operator">,</span>
                              tr(<span class="string">&quot;The torrent file %1 cannot not be opened/resumed.&quot;</span>)<span class="operator">.</span>arg(fileName));
         <span class="keyword">delete</span> client;
         <span class="keyword">return</span> <span class="keyword">false</span>;
     }
     client<span class="operator">-</span><span class="operator">&gt;</span>setDestinationFolder(destinationFolder);
     client<span class="operator">-</span><span class="operator">&gt;</span>setDumpedState(resumeState);

     <span class="comment">// Setup the client connections.</span>
     connect(client<span class="operator">,</span> SIGNAL(stateChanged(TorrentClient<span class="operator">::</span>State))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateState(TorrentClient<span class="operator">::</span>State)));
     connect(client<span class="operator">,</span> SIGNAL(peerInfoUpdated())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updatePeerInfo()));
     connect(client<span class="operator">,</span> SIGNAL(progressUpdated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateProgress(<span class="type">int</span>)));
     connect(client<span class="operator">,</span> SIGNAL(downloadRateUpdated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateDownloadRate(<span class="type">int</span>)));
     connect(client<span class="operator">,</span> SIGNAL(uploadRateUpdated(<span class="type">int</span>))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(updateUploadRate(<span class="type">int</span>)));
     connect(client<span class="operator">,</span> SIGNAL(stopped())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(torrentStopped()));
     connect(client<span class="operator">,</span> SIGNAL(error(TorrentClient<span class="operator">::</span>Error))<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(torrentError(TorrentClient<span class="operator">::</span>Error)));

     <span class="comment">// Add the client to the list of downloading jobs.</span>
     Job job;
     job<span class="operator">.</span>client <span class="operator">=</span> client;
     job<span class="operator">.</span>torrentFileName <span class="operator">=</span> fileName;
     job<span class="operator">.</span>destinationDirectory <span class="operator">=</span> destinationFolder;
     jobs <span class="operator">&lt;</span><span class="operator">&lt;</span> job;

     <span class="comment">// Create and add a row in the torrent view for this download.</span>
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span>(torrentView);

     <span class="type"><a href="qstring.html">QString</a></span> baseFileName <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>fileName();
     <span class="keyword">if</span> (baseFileName<span class="operator">.</span>toLower()<span class="operator">.</span>endsWith(<span class="string">&quot;.torrent&quot;</span>))
         baseFileName<span class="operator">.</span>remove(baseFileName<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">8</span>);

     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">0</span><span class="operator">,</span> baseFileName);
     item<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(<span class="number">0</span><span class="operator">,</span> tr(<span class="string">&quot;Torrent: %1&lt;br&gt;Destination: %2&quot;</span>)
                      <span class="operator">.</span>arg(baseFileName)<span class="operator">.</span>arg(destinationFolder));
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">1</span><span class="operator">,</span> tr(<span class="string">&quot;0/0&quot;</span>));
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">2</span><span class="operator">,</span> <span class="string">&quot;0&quot;</span>);
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">3</span><span class="operator">,</span> <span class="string">&quot;0.0 KB/s&quot;</span>);
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">4</span><span class="operator">,</span> <span class="string">&quot;0.0 KB/s&quot;</span>);
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">5</span><span class="operator">,</span> tr(<span class="string">&quot;Idle&quot;</span>));
     item<span class="operator">-</span><span class="operator">&gt;</span>setFlags(item<span class="operator">-</span><span class="operator">&gt;</span>flags() <span class="operator">&amp;</span> <span class="operator">~</span><span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>ItemIsEditable);
     item<span class="operator">-</span><span class="operator">&gt;</span>setTextAlignment(<span class="number">1</span><span class="operator">,</span> <span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>AlignHCenter);

     <span class="keyword">if</span> (<span class="operator">!</span>saveChanges) {
         saveChanges <span class="operator">=</span> <span class="keyword">true</span>;
         <span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">5000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveSettings()));
     }
     client<span class="operator">-</span><span class="operator">&gt;</span>start();
     <span class="keyword">return</span> <span class="keyword">true</span>;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>saveSettings()
 {
     <span class="keyword">if</span> (<span class="operator">!</span>saveChanges)
       <span class="keyword">return</span>;
     saveChanges <span class="operator">=</span> <span class="keyword">false</span>;

     <span class="comment">// Prepare and reset the settings</span>
     <span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="string">&quot;Trolltech&quot;</span><span class="operator">,</span> <span class="string">&quot;Torrent&quot;</span>);
     settings<span class="operator">.</span>clear();

     settings<span class="operator">.</span>setValue(<span class="string">&quot;LastDirectory&quot;</span><span class="operator">,</span> lastDirectory);
     settings<span class="operator">.</span>setValue(<span class="string">&quot;UploadLimit&quot;</span><span class="operator">,</span> uploadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>value());
     settings<span class="operator">.</span>setValue(<span class="string">&quot;DownloadLimit&quot;</span><span class="operator">,</span> downloadLimitSlider<span class="operator">-</span><span class="operator">&gt;</span>value());

     <span class="comment">// Store data on all known torrents</span>
     settings<span class="operator">.</span>beginWriteArray(<span class="string">&quot;Torrents&quot;</span>);
     <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> jobs<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
         settings<span class="operator">.</span>setArrayIndex(i);
         settings<span class="operator">.</span>setValue(<span class="string">&quot;sourceFileName&quot;</span><span class="operator">,</span> jobs<span class="operator">.</span>at(i)<span class="operator">.</span>torrentFileName);
         settings<span class="operator">.</span>setValue(<span class="string">&quot;destinationFolder&quot;</span><span class="operator">,</span> jobs<span class="operator">.</span>at(i)<span class="operator">.</span>destinationDirectory);
         settings<span class="operator">.</span>setValue(<span class="string">&quot;uploadedBytes&quot;</span><span class="operator">,</span> jobs<span class="operator">.</span>at(i)<span class="operator">.</span>client<span class="operator">-</span><span class="operator">&gt;</span>uploadedBytes());
         settings<span class="operator">.</span>setValue(<span class="string">&quot;downloadedBytes&quot;</span><span class="operator">,</span> jobs<span class="operator">.</span>at(i)<span class="operator">.</span>client<span class="operator">-</span><span class="operator">&gt;</span>downloadedBytes());
         settings<span class="operator">.</span>setValue(<span class="string">&quot;resumeState&quot;</span><span class="operator">,</span> jobs<span class="operator">.</span>at(i)<span class="operator">.</span>client<span class="operator">-</span><span class="operator">&gt;</span>dumpedState());
     }
     settings<span class="operator">.</span>endArray();
     settings<span class="operator">.</span>sync();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateState(TorrentClient<span class="operator">::</span>State)
 {
     <span class="comment">// Update the state string whenever the client's state changes.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(row);
     <span class="keyword">if</span> (item) {
         item<span class="operator">-</span><span class="operator">&gt;</span>setToolTip(<span class="number">0</span><span class="operator">,</span> tr(<span class="string">&quot;Torrent: %1&lt;br&gt;Destination: %2&lt;br&gt;State: %3&quot;</span>)
                          <span class="operator">.</span>arg(jobs<span class="operator">.</span>at(row)<span class="operator">.</span>torrentFileName)
                          <span class="operator">.</span>arg(jobs<span class="operator">.</span>at(row)<span class="operator">.</span>destinationDirectory)
                          <span class="operator">.</span>arg(client<span class="operator">-</span><span class="operator">&gt;</span>stateString()));

         item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">5</span><span class="operator">,</span> client<span class="operator">-</span><span class="operator">&gt;</span>stateString());
     }
     setActionsEnabled();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updatePeerInfo()
 {
     <span class="comment">// Update the number of connected, visited, seed and leecher peers.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);

     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(row);
     item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">1</span><span class="operator">,</span> tr(<span class="string">&quot;%1/%2&quot;</span>)<span class="operator">.</span>arg(client<span class="operator">-</span><span class="operator">&gt;</span>connectedPeerCount())
                   <span class="operator">.</span>arg(client<span class="operator">-</span><span class="operator">&gt;</span>seedCount()));
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateProgress(<span class="type">int</span> percent)
 {
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);

     <span class="comment">// Update the progressbar.</span>
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(row);
     <span class="keyword">if</span> (item)
         item<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">2</span><span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(percent));
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>setActionsEnabled()
 {
     <span class="comment">// Find the view item and client for the current row, and update</span>
     <span class="comment">// the states of the actions.</span>
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> <span class="number">0</span>;
     <span class="keyword">if</span> (<span class="operator">!</span>torrentView<span class="operator">-</span><span class="operator">&gt;</span>selectedItems()<span class="operator">.</span>isEmpty())
         item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>selectedItems()<span class="operator">.</span>first();
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> item <span class="operator">?</span> jobs<span class="operator">.</span>at(torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(item))<span class="operator">.</span>client : <span class="number">0</span>;
     <span class="type">bool</span> pauseEnabled <span class="operator">=</span> client <span class="operator">&amp;</span><span class="operator">&amp;</span> ((client<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> TorrentClient<span class="operator">::</span>Paused)
                                        <span class="operator">|</span><span class="operator">|</span>  (client<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">&gt;</span> TorrentClient<span class="operator">::</span>Preparing));

     removeTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(item <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
     pauseTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(item <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> pauseEnabled);

     <span class="keyword">if</span> (client <span class="operator">&amp;</span><span class="operator">&amp;</span> client<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">=</span><span class="operator">=</span> TorrentClient<span class="operator">::</span>Paused) {
         pauseTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/player_play.png&quot;</span>));
         pauseTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Resume torrent&quot;</span>));
     } <span class="keyword">else</span> {
         pauseTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setIcon(<span class="type"><a href="qicon.html">QIcon</a></span>(<span class="string">&quot;:/icons/player_pause.png&quot;</span>));
         pauseTorrentAction<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Pause torrent&quot;</span>));
     }

     <span class="type">int</span> row <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(item);
     upActionTool<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(item <span class="operator">&amp;</span><span class="operator">&amp;</span> row <span class="operator">!</span><span class="operator">=</span> <span class="number">0</span>);
     downActionTool<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(item <span class="operator">&amp;</span><span class="operator">&amp;</span> row <span class="operator">!</span><span class="operator">=</span> jobs<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateDownloadRate(<span class="type">int</span> bytesPerSecond)
 {
     <span class="comment">// Update the download rate.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);
     <span class="type"><a href="qstring.html">QString</a></span> num;
     num<span class="operator">.</span>sprintf(<span class="string">&quot;%.1f KB/s&quot;</span><span class="operator">,</span> bytesPerSecond <span class="operator">/</span> <span class="number">1024.0</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(row)<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">3</span><span class="operator">,</span> num);

     <span class="keyword">if</span> (<span class="operator">!</span>saveChanges) {
         saveChanges <span class="operator">=</span> <span class="keyword">true</span>;
         <span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">5000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveSettings()));
     }
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>updateUploadRate(<span class="type">int</span> bytesPerSecond)
 {
     <span class="comment">// Update the upload rate.</span>
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> qobject_cast<span class="operator">&lt;</span>TorrentClient <span class="operator">*</span><span class="operator">&gt;</span>(sender());
     <span class="type">int</span> row <span class="operator">=</span> rowOfClient(client);
     <span class="type"><a href="qstring.html">QString</a></span> num;
     num<span class="operator">.</span>sprintf(<span class="string">&quot;%.1f KB/s&quot;</span><span class="operator">,</span> bytesPerSecond <span class="operator">/</span> <span class="number">1024.0</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>topLevelItem(row)<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="number">4</span><span class="operator">,</span> num);

     <span class="keyword">if</span> (<span class="operator">!</span>saveChanges) {
         saveChanges <span class="operator">=</span> <span class="keyword">true</span>;
         <span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">5000</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(saveSettings()));
     }
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>pauseTorrent()
 {
     <span class="comment">// Pause or unpause the current torrent.</span>
     <span class="type">int</span> row <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(torrentView<span class="operator">-</span><span class="operator">&gt;</span>currentItem());
     TorrentClient <span class="operator">*</span>client <span class="operator">=</span> jobs<span class="operator">.</span>at(row)<span class="operator">.</span>client;
     client<span class="operator">-</span><span class="operator">&gt;</span>setPaused(client<span class="operator">-</span><span class="operator">&gt;</span>state() <span class="operator">!</span><span class="operator">=</span> TorrentClient<span class="operator">::</span>Paused);
     setActionsEnabled();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>moveTorrentUp()
 {
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>currentItem();
     <span class="type">int</span> row <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(item);
     <span class="keyword">if</span> (row <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>)
         <span class="keyword">return</span>;

     Job tmp <span class="operator">=</span> jobs<span class="operator">.</span>at(row <span class="operator">-</span> <span class="number">1</span>);
     jobs<span class="operator">[</span>row <span class="operator">-</span> <span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> jobs<span class="operator">[</span>row<span class="operator">]</span>;
     jobs<span class="operator">[</span>row<span class="operator">]</span> <span class="operator">=</span> tmp;

     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>itemAbove <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>takeTopLevelItem(row <span class="operator">-</span> <span class="number">1</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>insertTopLevelItem(row<span class="operator">,</span> itemAbove);
     setActionsEnabled();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>moveTorrentDown()
 {
     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>item <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>currentItem();
     <span class="type">int</span> row <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>indexOfTopLevelItem(item);
     <span class="keyword">if</span> (row <span class="operator">=</span><span class="operator">=</span> jobs<span class="operator">.</span>size() <span class="operator">-</span> <span class="number">1</span>)
         <span class="keyword">return</span>;

     Job tmp <span class="operator">=</span> jobs<span class="operator">.</span>at(row <span class="operator">+</span> <span class="number">1</span>);
     jobs<span class="operator">[</span>row <span class="operator">+</span> <span class="number">1</span><span class="operator">]</span> <span class="operator">=</span> jobs<span class="operator">[</span>row<span class="operator">]</span>;
     jobs<span class="operator">[</span>row<span class="operator">]</span> <span class="operator">=</span> tmp;

     <span class="type"><a href="qtreewidgetitem.html">QTreeWidgetItem</a></span> <span class="operator">*</span>itemAbove <span class="operator">=</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>takeTopLevelItem(row <span class="operator">+</span> <span class="number">1</span>);
     torrentView<span class="operator">-</span><span class="operator">&gt;</span>insertTopLevelItem(row<span class="operator">,</span> itemAbove);
     setActionsEnabled();
 }

 <span class="keyword">static</span> <span class="type">int</span> rateFromValue(<span class="type">int</span> value)
 {
     <span class="type">int</span> rate <span class="operator">=</span> <span class="number">0</span>;
     <span class="keyword">if</span> (value <span class="operator">&gt;</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> value <span class="operator">&lt;</span> <span class="number">250</span>) {
         rate <span class="operator">=</span> <span class="number">1</span> <span class="operator">+</span> <span class="type">int</span>(value <span class="operator">*</span> <span class="number">0.124</span>);
     } <span class="keyword">else</span> <span class="keyword">if</span> (value <span class="operator">&lt;</span> <span class="number">500</span>) {
         rate <span class="operator">=</span> <span class="number">32</span> <span class="operator">+</span> <span class="type">int</span>((value <span class="operator">-</span> <span class="number">250</span>) <span class="operator">*</span> <span class="number">0.384</span>);
     } <span class="keyword">else</span> <span class="keyword">if</span> (value <span class="operator">&lt;</span> <span class="number">750</span>) {
         rate <span class="operator">=</span> <span class="number">128</span> <span class="operator">+</span> <span class="type">int</span>((value <span class="operator">-</span> <span class="number">500</span>) <span class="operator">*</span> <span class="number">1.536</span>);
     } <span class="keyword">else</span> {
         rate <span class="operator">=</span> <span class="number">512</span> <span class="operator">+</span> <span class="type">int</span>((value <span class="operator">-</span> <span class="number">750</span>) <span class="operator">*</span> <span class="number">6.1445</span>);
     }
     <span class="keyword">return</span> rate;
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>setUploadLimit(<span class="type">int</span> value)
 {
     <span class="type">int</span> rate <span class="operator">=</span> rateFromValue(value);
     uploadLimitLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;%1 KB/s&quot;</span>)<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">.</span>sprintf(<span class="string">&quot;%4d&quot;</span><span class="operator">,</span> rate)));
     RateController<span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">&gt;</span>setUploadLimit(rate <span class="operator">*</span> <span class="number">1024</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>setDownloadLimit(<span class="type">int</span> value)
 {
     <span class="type">int</span> rate <span class="operator">=</span> rateFromValue(value);
     downloadLimitLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;%1 KB/s&quot;</span>)<span class="operator">.</span>arg(<span class="type"><a href="qstring.html">QString</a></span>()<span class="operator">.</span>sprintf(<span class="string">&quot;%4d&quot;</span><span class="operator">,</span> rate)));
     RateController<span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">&gt;</span>setDownloadLimit(rate <span class="operator">*</span> <span class="number">1024</span>);
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>about()
 {
     <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>icon <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
     icon<span class="operator">-</span><span class="operator">&gt;</span>setPixmap(<span class="type"><a href="qpixmap.html">QPixmap</a></span>(<span class="string">&quot;:/icons/peertopeer.png&quot;</span>));

     <span class="type"><a href="qlabel.html">QLabel</a></span> <span class="operator">*</span>text <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>;
     text<span class="operator">-</span><span class="operator">&gt;</span>setWordWrap(<span class="keyword">true</span>);
     text<span class="operator">-</span><span class="operator">&gt;</span>setText(<span class="string">&quot;&lt;p&gt;The &lt;b&gt;Torrent Client&lt;/b&gt; example demonstrates how to&quot;</span>
                   <span class="string">&quot; write a complete peer-to-peer file sharing&quot;</span>
                   <span class="string">&quot; application using Qt's network and thread classes.&lt;/p&gt;&quot;</span>
                   <span class="string">&quot;&lt;p&gt;This feature complete client implementation of&quot;</span>
                   <span class="string">&quot; the BitTorrent protocol can efficiently&quot;</span>
                   <span class="string">&quot; maintain several hundred network connections&quot;</span>
                   <span class="string">&quot; simultaneously.&lt;/p&gt;&quot;</span>);

     <span class="type"><a href="qpushbutton.html">QPushButton</a></span> <span class="operator">*</span>quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(<span class="string">&quot;OK&quot;</span>);

     <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>topLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
     topLayout<span class="operator">-</span><span class="operator">&gt;</span>setMargin(<span class="number">10</span>);
     topLayout<span class="operator">-</span><span class="operator">&gt;</span>setSpacing(<span class="number">10</span>);
     topLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(icon);
     topLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(text);

     <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span> <span class="operator">*</span>bottomLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qhboxlayout.html">QHBoxLayout</a></span>;
     bottomLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();
     bottomLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(quitButton);
     bottomLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch();

     <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
     mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(topLayout);
     mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addLayout(bottomLayout);

     <span class="type"><a href="qdialog.html">QDialog</a></span> about(<span class="keyword">this</span>);
     about<span class="operator">.</span>setModal(<span class="keyword">true</span>);
     about<span class="operator">.</span>setWindowTitle(tr(<span class="string">&quot;About Torrent Client&quot;</span>));
     about<span class="operator">.</span>setLayout(mainLayout);

     connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="operator">&amp;</span>about<span class="operator">,</span> SLOT(close()));

     about<span class="operator">.</span>exec();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>acceptFileDrop(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>fileName)
 {
     <span class="comment">// Create and show the &quot;Add Torrent&quot; dialog.</span>
     AddTorrentDialog <span class="operator">*</span>addTorrentDialog <span class="operator">=</span> <span class="keyword">new</span> AddTorrentDialog;
     lastDirectory <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(fileName)<span class="operator">.</span>absolutePath();
     addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>setTorrent(fileName);
     addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
     <span class="keyword">if</span> (<span class="operator">!</span>addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>exec())
         <span class="keyword">return</span>;

     <span class="comment">// Add the torrent to our list of downloads.</span>
     addTorrent(fileName<span class="operator">,</span> addTorrentDialog<span class="operator">-</span><span class="operator">&gt;</span>destinationFolder());
     saveSettings();
 }

 <span class="type">void</span> MainWindow<span class="operator">::</span>closeEvent(<span class="type"><a href="qcloseevent.html">QCloseEvent</a></span> <span class="operator">*</span>)
 {
     <span class="keyword">if</span> (jobs<span class="operator">.</span>isEmpty())
         <span class="keyword">return</span>;

     <span class="comment">// Save upload / download numbers.</span>
     saveSettings();
     saveChanges <span class="operator">=</span> <span class="keyword">false</span>;

     quitDialog <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprogressdialog.html">QProgressDialog</a></span>(tr(<span class="string">&quot;Disconnecting from trackers&quot;</span>)<span class="operator">,</span> tr(<span class="string">&quot;Abort&quot;</span>)<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> jobsToStop<span class="operator">,</span> <span class="keyword">this</span>);

     <span class="comment">// Stop all clients, remove the rows from the view and wait for</span>
     <span class="comment">// them to signal that they have stopped.</span>
     jobsToStop <span class="operator">=</span> <span class="number">0</span>;
     jobsStopped <span class="operator">=</span> <span class="number">0</span>;
     foreach (Job job<span class="operator">,</span> jobs) {
         <span class="operator">+</span><span class="operator">+</span>jobsToStop;
         TorrentClient <span class="operator">*</span>client <span class="operator">=</span> job<span class="operator">.</span>client;
         client<span class="operator">-</span><span class="operator">&gt;</span>disconnect();
         connect(client<span class="operator">,</span> SIGNAL(stopped())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(torrentStopped()));
         client<span class="operator">-</span><span class="operator">&gt;</span>stop();
         <span class="keyword">delete</span> torrentView<span class="operator">-</span><span class="operator">&gt;</span>takeTopLevelItem(<span class="number">0</span>);
     }

     <span class="keyword">if</span> (jobsToStop <span class="operator">&gt;</span> jobsStopped)
         quitDialog<span class="operator">-</span><span class="operator">&gt;</span>exec();
     quitDialog<span class="operator">-</span><span class="operator">&gt;</span>deleteLater();
     quitDialog <span class="operator">=</span> <span class="number">0</span>;
 }

 TorrentView<span class="operator">::</span>TorrentView(<span class="type"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
     : <span class="type"><a href="qtreewidget.html">QTreeWidget</a></span>(parent)
 {
     setAcceptDrops(<span class="keyword">true</span>);
 }

 <span class="type">void</span> TorrentView<span class="operator">::</span>dragMoveEvent(<span class="type"><a href="qdragmoveevent.html">QDragMoveEvent</a></span> <span class="operator">*</span>event)
 {
     <span class="comment">// Accept file actions with a '.torrent' extension.</span>
     <span class="type"><a href="qurl.html">QUrl</a></span> url(event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>text());
     <span class="keyword">if</span> (url<span class="operator">.</span>isValid() <span class="operator">&amp;</span><span class="operator">&amp;</span> url<span class="operator">.</span>scheme()<span class="operator">.</span>toLower() <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;file&quot;</span>
             <span class="operator">&amp;</span><span class="operator">&amp;</span> url<span class="operator">.</span>path()<span class="operator">.</span>toLower()<span class="operator">.</span>endsWith(<span class="string">&quot;.torrent&quot;</span>))
         event<span class="operator">-</span><span class="operator">&gt;</span>acceptProposedAction();
 }

 <span class="type">void</span> TorrentView<span class="operator">::</span>dropEvent(<span class="type"><a href="qdropevent.html">QDropEvent</a></span> <span class="operator">*</span>event)
 {
     <span class="comment">// Accept drops if the file has a '.torrent' extension and it</span>
     <span class="comment">// exists.</span>
     <span class="type"><a href="qstring.html">QString</a></span> fileName <span class="operator">=</span> <span class="type"><a href="qurl.html">QUrl</a></span>(event<span class="operator">-</span><span class="operator">&gt;</span>mimeData()<span class="operator">-</span><span class="operator">&gt;</span>text())<span class="operator">.</span>path();
     <span class="keyword">if</span> (<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>exists(fileName) <span class="operator">&amp;</span><span class="operator">&amp;</span> fileName<span class="operator">.</span>toLower()<span class="operator">.</span>endsWith(<span class="string">&quot;.torrent&quot;</span>))
         <span class="keyword">emit</span> fileDropped(fileName);
 }

 <span class="preprocessor">#include &quot;mainwindow.moc&quot;</span></pre>
</div>
<!-- @@@network/torrent/mainwindow.cpp -->
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