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dialog.cpp Example File
dialogs/sipdialog/dialog.cpp

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 #include <QtGui>

 #include "dialog.h"

 Dialog::Dialog()
 {
     desktopGeometry = QApplication::desktop()->availableGeometry(0);

     setWindowTitle(tr("SIP Dialog Example"));
     QScrollArea *scrollArea = new QScrollArea(this);
     QGroupBox *groupBox = new QGroupBox(scrollArea);
     groupBox->setTitle(tr("SIP Dialog Example"));
     QGridLayout *gridLayout = new QGridLayout(groupBox);
     groupBox->setLayout(gridLayout);

     QLineEdit* lineEdit = new QLineEdit(groupBox);
     lineEdit->setText(tr("Open and close the SIP"));
     lineEdit->setMinimumWidth(220);

     QLabel* label = new QLabel(groupBox);
     label->setText(tr("This dialog resizes if the SIP is opened"));
     label->setMinimumWidth(220);

     QPushButton* button = new QPushButton(groupBox);
     button->setText(tr("Close Dialog"));
     button->setMinimumWidth(220);

     if (desktopGeometry.height() < 400)
         gridLayout->setVerticalSpacing(80);
     else
         gridLayout->setVerticalSpacing(150);

     gridLayout->addWidget(label);
     gridLayout->addWidget(lineEdit);
     gridLayout->addWidget(button);

     scrollArea->setWidget(groupBox);
     QHBoxLayout* layout = new QHBoxLayout();
     layout->addWidget(scrollArea);
     setLayout(layout);
     scrollArea->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

     connect(button, SIGNAL(pressed()),
         qApp, SLOT(closeAllWindows()));
     connect(QApplication::desktop(), SIGNAL(workAreaResized(int)),
         this, SLOT(desktopResized(int)));
 }

 void Dialog::desktopResized(int screen)
 {
     if (screen != 0)
         return;
     reactToSIP();
 }

 void Dialog::reactToSIP()
 {
     QRect availableGeometry = QApplication::desktop()->availableGeometry(0);

     if (desktopGeometry.width() == availableGeometry.width()) {
         if (desktopGeometry.height() > availableGeometry.height()) {
             setWindowState(windowState() & ~Qt::WindowMaximized);
             setGeometry(availableGeometry);
         } else {
             setWindowState(windowState() | Qt::WindowMaximized);
         }
     }
     desktopGeometry = availableGeometry;
 }


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Qt 4.4.3