Qt Reference Documentation

main.cpp Example File

maemo5/rotation/main.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** This file is part of the examples of the Qt Toolkit.
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 **
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 ** 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
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 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
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 ****************************************************************************/

 #include <QtGui>

 class RotationWidget : public QWidget
 {
     Q_OBJECT

 public:
     RotationWidget()
     {
         QVBoxLayout *layout = new QVBoxLayout(this);

         label = new QLabel;

         QHBoxLayout *blayout = new QHBoxLayout;
         blayout->setSpacing(0);

         QRadioButton *button1 = new QRadioButton("Portrait");
         QRadioButton *button2 = new QRadioButton("Auto");
         QRadioButton *button3 = new QRadioButton("Landscape");

         button2->toggle();

         connect(button1, SIGNAL(clicked()), this, SLOT(setPortrait()));
         connect(button2, SIGNAL(clicked()), this, SLOT(setAutoRotation()));
         connect(button3, SIGNAL(clicked()), this, SLOT(setLandscape()));

         blayout->addWidget(button1);
         blayout->addWidget(button2);
         blayout->addWidget(button3);

         layout->addWidget(label);
         layout->addLayout(blayout);

 // ![3]
         connect(QApplication::desktop(), SIGNAL(resized(int)), this, SLOT(orientationChanged()));
 // ![3]

         setAutoRotation();

         // initialize the label according to the current rotation
         orientationChanged();
     }

 public slots:
     void setLandscape()
     {
 // ![0]
         setAttribute(Qt::WA_Maemo5LandscapeOrientation, true);
 // ![0]
     }

     void setPortrait()
     {
 // ![1]
         setAttribute(Qt::WA_Maemo5PortraitOrientation, true);
 // ![1]
     }

     void setAutoRotation()
     {
 // ![2]
         setAttribute(Qt::WA_Maemo5AutoOrientation, true);
 // ![2]
     }

 // ![4]
     void orientationChanged()
     {
         QRect screenGeometry = QApplication::desktop()->screenGeometry();
         if (screenGeometry.width() > screenGeometry.height())
             label->setText("<p align=\"center\">In Landscape Mode</p>");
         else
             label->setText("<p align=\"center\">In Portrait Mode</p>");
     }
 // ![4]

 private:
     QLabel *label;
 };

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

     RotationWidget w;
     w.show();

     return app.exec();
 }

 #include "main.moc"
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