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mainwindow.h Example File
network/torrent/mainwindow.h

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QList>
 #include <QStringList>
 #include <QMainWindow>

 #include "torrentclient.h"

 class QAction;
 class QCloseEvent;
 class QLabel;
 class QProgressDialog;
 class QSlider;

 class TorrentView;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow(QWidget *parent = 0);

     QSize sizeHint() const;
     const TorrentClient *clientForRow(int row) const;

 protected:
     void closeEvent(QCloseEvent *event);

 private slots:
     void loadSettings();
     void saveSettings();

     bool addTorrent();
     void removeTorrent();
     void pauseTorrent();
     void moveTorrentUp();
     void moveTorrentDown();

     void torrentStopped();
     void torrentError(TorrentClient::Error error);

     void updateState(TorrentClient::State state);
     void updatePeerInfo();
     void updateProgress(int percent);
     void updateDownloadRate(int bytesPerSecond);
     void updateUploadRate(int bytesPerSecond);

     void setUploadLimit(int bytes);
     void setDownloadLimit(int bytes);

     void about();
     void setActionsEnabled();
     void acceptFileDrop(const QString &fileName);

 private:
     int rowOfClient(TorrentClient *client) const;
     bool addTorrent(const QString &fileName, const QString &destinationFolder,
                     const QByteArray &resumeState = QByteArray());

     TorrentView *torrentView;
     QAction *pauseTorrentAction;
     QAction *removeTorrentAction;
     QAction *upActionTool;
     QAction *downActionTool;
     QSlider *uploadLimitSlider;
     QSlider *downloadLimitSlider;
     QLabel *uploadLimitLabel;
     QLabel *downloadLimitLabel;

     int uploadLimit;
     int downloadLimit;

     struct Job {
         TorrentClient *client;
         QString torrentFileName;
         QString destinationDirectory;
     };
     QList<Job> jobs;
     int jobsStopped;
     int jobsToStop;

     QString lastDirectory;
     QProgressDialog *quitDialog;

     bool saveChanges;
 };

 #endif