AirTV-Qt/qtsingleapplication/examples/loader/main.cpp

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  39
  40 #include <qtsingleapplication.h>
  41 #include <QtCore/QFile>
  42 #include <QtGui/QMainWindow>
  43 #include <QtGui/QPrinter>
  44 #include <QtGui/QPainter>
  45 #include <QtGui/QTextEdit>
  46 #include <QtGui/QMdiArea>
  47 #include <QtCore/QTextStream>
  48
  49 class MainWindow : public QMainWindow
  50 {
  51     Q_OBJECT
  52 public:
  53     MainWindow();
  54
  55 public slots:
  56     void handleMessage(const QString& message);
  57
  58 signals:
  59     void needToShow();
  60
  61 private:
  62     QMdiArea *workspace;
  63 };
  64
  65 MainWindow::MainWindow()
  66 {
  67     workspace = new QMdiArea(this);
  68
  69     setCentralWidget(workspace);
  70 }
  71
  72 void MainWindow::handleMessage(const QString& message)
  73 {
  74     enum Action {
  75         Nothing,
  76         Open,
  77         Print
  78     } action;
  79
  80     action = Nothing;
  81     QString filename = message;
  82     if (message.toLower().startsWith("/print ")) {
  83         filename = filename.mid(7);
  84         action = Print;
  85     } else if (!message.isEmpty()) {
  86         action = Open;
  87     }
  88     if (action == Nothing) {
  89         emit needToShow();
  90         return;
  91     }
  92
  93     QFile file(filename);
  94     QString contents;
  95     if (file.open(QIODevice::ReadOnly))
  96         contents = file.readAll();
  97     else
  98         contents = "[[Error: Could not load file " + filename + "]]";
  99
 100     QTextEdit *view = new QTextEdit;
 101     view->setPlainText(contents);
 102
 103     switch(action) {
 104     case Print:
 105         {
 106             QPrinter printer;
 107             view->print(&printer);
 108             delete view;
 109         }
 110         break;
 111
 112     case Open:
 113         {
 114             workspace->addSubWindow(view);
 115             view->setWindowTitle(message);
 116             view->show();
 117             emit needToShow();
 118         }
 119         break;
 120     default:
 121         break;
 122     };
 123 }
 124
 125 #include "main.moc"
 126
 127 int main(int argc, char **argv)
 128 {
 129     QtSingleApplication instance("File loader QtSingleApplication example", argc, argv);
 130     QString message;
 131     for (int a = 1; a < argc; ++a) {
 132         message += argv[a];
 133         if (a < argc-1)
 134             message += " ";
 135     }
 136
 137     if (instance.sendMessage(message))
 138         return 0;
 139
 140     MainWindow mw;
 141     mw.handleMessage(message);
 142     mw.show();
 143
 144     QObject::connect(&instance, SIGNAL(messageReceived(const QString&)),
 145                      &mw, SLOT(handleMessage(const QString&)));
 146
 147     instance.setActivationWindow(&mw, false);
 148     QObject::connect(&mw, SIGNAL(needToShow()), &instance, SLOT(activateWindow()));
 149
 150     return instance.exec();
 151 }