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mainwindow.cpp Example File
widgets/stylesheet/mainwindow.cpp

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 #include <QtGui>

 #include "mainwindow.h"
 #include "stylesheeteditor.h"

 MainWindow::MainWindow()
 {
     ui.setupUi(this);

     ui.nameLabel->setProperty("class", "mandatory QLabel");

     styleSheetEditor = new StyleSheetEditor(this);

     statusBar()->addWidget(new QLabel(tr("Ready")));

     connect(ui.exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
     connect(ui.aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
 }

 void MainWindow::on_editStyleAction_triggered()
 {
     styleSheetEditor->show();
     styleSheetEditor->activateWindow();
 }

 void MainWindow::on_aboutAction_triggered()
 {
     QMessageBox::about(this, tr("About Style sheet"),
         tr("The <b>Style Sheet</b> example shows how widgets can be styled "
            "using <a href=\"http://doc.trolltech.com/4.2/stylesheet.html\">Qt "
            "Style Sheets</a>. Click <b>File|Edit Style Sheet</b> to pop up the "
            "style editor, and either choose an existing style sheet or design "
            "your own."));
 }