Custom Type Sending Example

The Window Class Implementation

The Window constructor sets up a user interface containing a text editor and a push button.

 Window::Window()
 {
     editor = new QTextEdit();
     QPushButton *sendButton = new QPushButton(tr("&Send message"));

     connect(sendButton, SIGNAL(clicked()), this, SLOT(sendMessage()));

     QHBoxLayout *buttonLayout = new QHBoxLayout();
     buttonLayout->addStretch();
     buttonLayout->addWidget(sendButton);
     buttonLayout->addStretch();

     QVBoxLayout *layout = new QVBoxLayout(this);
     layout->addWidget(editor);
     layout->addLayout(buttonLayout);

     setWindowTitle(tr("Custom Type Sending"));
 }

The button's clicked() signal is connected to the window's sendMessage() slot, which emits the messageSent(Message) signal with the Message held by the thisMessage variable:

 void Window::sendMessage()
 {
     thisMessage = Message(editor->toPlainText(), thisMessage.headers());
     emit messageSent(thisMessage);
 }

We implement a slot to allow the message to be received, and this also lets us set the message in the window programatically:

 void Window::setMessage(const Message &message)
 {
     thisMessage = message;
     editor->setPlainText(thisMessage.body());
 }

In this function, we simply assign the new message to thisMessage and update the text in the editor.

 int main(int argc, char *argv[])
 {
     QApplication app(argc, argv);

     Window window1;
     QStringList headers;
     headers << "Subject: Hello World"
             << "From: qt-info@nokia.com";
     QString body = "This is a test.\r\n";
     Message message(body, headers);
     window1.setMessage(message);

     Window window2;
     QObject::connect(&window1, SIGNAL(messageSent(Message)),
                      &window2, SLOT(setMessage(Message)));
     QObject::connect(&window2, SIGNAL(messageSent(Message)),
                      &window1, SLOT(setMessage(Message)));
     window1.show();
     window2.show();
     return app.exec();
 }