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widgetgallery.cpp Example File
widgets/styles/widgetgallery.cpp

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 #include <QtGui>

 #include "norwegianwoodstyle.h"
 #include "widgetgallery.h"

 WidgetGallery::WidgetGallery(QWidget *parent)
     : QDialog(parent)
 {
     originalPalette = QApplication::palette();

     styleComboBox = new QComboBox;
     styleComboBox->addItem("NorwegianWood");
     styleComboBox->addItems(QStyleFactory::keys());

     styleLabel = new QLabel(tr("&Style:"));
     styleLabel->setBuddy(styleComboBox);

     useStylePaletteCheckBox = new QCheckBox(tr("&Use style's standard palette"));
     useStylePaletteCheckBox->setChecked(true);

     disableWidgetsCheckBox = new QCheckBox(tr("&Disable widgets"));

     createTopLeftGroupBox();
     createTopRightGroupBox();
     createBottomLeftTabWidget();
     createBottomRightGroupBox();
     createProgressBar();

     connect(styleComboBox, SIGNAL(activated(const QString &)),
             this, SLOT(changeStyle(const QString &)));
     connect(useStylePaletteCheckBox, SIGNAL(toggled(bool)),
             this, SLOT(changePalette()));
     connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
             topLeftGroupBox, SLOT(setDisabled(bool)));
     connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
             topRightGroupBox, SLOT(setDisabled(bool)));
     connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
             bottomLeftTabWidget, SLOT(setDisabled(bool)));
     connect(disableWidgetsCheckBox, SIGNAL(toggled(bool)),
             bottomRightGroupBox, SLOT(setDisabled(bool)));

     QHBoxLayout *topLayout = new QHBoxLayout;
     topLayout->addWidget(styleLabel);
     topLayout->addWidget(styleComboBox);
     topLayout->addStretch(1);
     topLayout->addWidget(useStylePaletteCheckBox);
     topLayout->addWidget(disableWidgetsCheckBox);

     QGridLayout *mainLayout = new QGridLayout;
     mainLayout->addLayout(topLayout, 0, 0, 1, 2);
     mainLayout->addWidget(topLeftGroupBox, 1, 0);
     mainLayout->addWidget(topRightGroupBox, 1, 1);
     mainLayout->addWidget(bottomLeftTabWidget, 2, 0);
     mainLayout->addWidget(bottomRightGroupBox, 2, 1);
     mainLayout->addWidget(progressBar, 3, 0, 1, 2);
     mainLayout->setRowStretch(1, 1);
     mainLayout->setRowStretch(2, 1);
     mainLayout->setColumnStretch(0, 1);
     mainLayout->setColumnStretch(1, 1);
     setLayout(mainLayout);

     setWindowTitle(tr("Styles"));
     changeStyle("NorwegianWood");
 }

 void WidgetGallery::changeStyle(const QString &styleName)
 {
     if (styleName == "NorwegianWood") {
         QApplication::setStyle(new NorwegianWoodStyle);
     } else {
         QApplication::setStyle(QStyleFactory::create(styleName));
     }
     changePalette();
 }

 void WidgetGallery::changePalette()
 {
     if (useStylePaletteCheckBox->isChecked())
         QApplication::setPalette(QApplication::style()->standardPalette());
     else
         QApplication::setPalette(originalPalette);
 }

 void WidgetGallery::advanceProgressBar()
 {
     int curVal = progressBar->value();
     int maxVal = progressBar->maximum();
     progressBar->setValue(curVal + (maxVal - curVal) / 100);
 }

 void WidgetGallery::createTopLeftGroupBox()
 {
     topLeftGroupBox = new QGroupBox(tr("Group 1"));

     radioButton1 = new QRadioButton(tr("Radio button 1"));
     radioButton2 = new QRadioButton(tr("Radio button 2"));
     radioButton3 = new QRadioButton(tr("Radio button 3"));
     radioButton1->setChecked(true);

     checkBox = new QCheckBox(tr("Tri-state check box"));
     checkBox->setTristate(true);
     checkBox->setCheckState(Qt::PartiallyChecked);

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(radioButton1);
     layout->addWidget(radioButton2);
     layout->addWidget(radioButton3);
     layout->addWidget(checkBox);
     layout->addStretch(1);
     topLeftGroupBox->setLayout(layout);
 }

 void WidgetGallery::createTopRightGroupBox()
 {
     topRightGroupBox = new QGroupBox(tr("Group 2"));

     defaultPushButton = new QPushButton(tr("Default Push Button"));
     defaultPushButton->setDefault(true);

     togglePushButton = new QPushButton(tr("Toggle Push Button"));
     togglePushButton->setCheckable(true);
     togglePushButton->setChecked(true);

     flatPushButton = new QPushButton(tr("Flat Push Button"));
     flatPushButton->setFlat(true);

     QVBoxLayout *layout = new QVBoxLayout;
     layout->addWidget(defaultPushButton);
     layout->addWidget(togglePushButton);
     layout->addWidget(flatPushButton);
     layout->addStretch(1);
     topRightGroupBox->setLayout(layout);
 }

 void WidgetGallery::createBottomLeftTabWidget()
 {
     bottomLeftTabWidget = new QTabWidget;
     bottomLeftTabWidget->setSizePolicy(QSizePolicy::Preferred,
                                        QSizePolicy::Ignored);

     QWidget *tab1 = new QWidget;
     tableWidget = new QTableWidget(10, 10);

     QHBoxLayout *tab1hbox = new QHBoxLayout;
     tab1hbox->setMargin(5);
     tab1hbox->addWidget(tableWidget);
     tab1->setLayout(tab1hbox);

     QWidget *tab2 = new QWidget;
     textEdit = new QTextEdit;

     textEdit->setPlainText(tr("Twinkle, twinkle, little star,\n"
                               "How I wonder what you are.\n"
                               "Up above the world so high,\n"
                               "Like a diamond in the sky.\n"
                               "Twinkle, twinkle, little star,\n"
                               "How I wonder what you are!\n"));

     QHBoxLayout *tab2hbox = new QHBoxLayout;
     tab2hbox->setMargin(5);
     tab2hbox->addWidget(textEdit);
     tab2->setLayout(tab2hbox);

     bottomLeftTabWidget->addTab(tab1, tr("&Table"));
     bottomLeftTabWidget->addTab(tab2, tr("Text &Edit"));
 }

 void WidgetGallery::createBottomRightGroupBox()
 {
     bottomRightGroupBox = new QGroupBox(tr("Group 3"));
     bottomRightGroupBox->setCheckable(true);
     bottomRightGroupBox->setChecked(true);

     lineEdit = new QLineEdit("s3cRe7");
     lineEdit->setEchoMode(QLineEdit::Password);

     spinBox = new QSpinBox(bottomRightGroupBox);
     spinBox->setValue(50);

     dateTimeEdit = new QDateTimeEdit(bottomRightGroupBox);
     dateTimeEdit->setDateTime(QDateTime::currentDateTime());

     slider = new QSlider(Qt::Horizontal, bottomRightGroupBox);
     slider->setValue(40);

     scrollBar = new QScrollBar(Qt::Horizontal, bottomRightGroupBox);
     scrollBar->setValue(60);

     dial = new QDial(bottomRightGroupBox);
     dial->setValue(30);
     dial->setNotchesVisible(true);

     QGridLayout *layout = new QGridLayout;
     layout->addWidget(lineEdit, 0, 0, 1, 2);
     layout->addWidget(spinBox, 1, 0, 1, 2);
     layout->addWidget(dateTimeEdit, 2, 0, 1, 2);
     layout->addWidget(slider, 3, 0);
     layout->addWidget(scrollBar, 4, 0);
     layout->addWidget(dial, 3, 1, 2, 1);
     layout->setRowStretch(5, 1);
     bottomRightGroupBox->setLayout(layout);
 }

 void WidgetGallery::createProgressBar()
 {
     progressBar = new QProgressBar;
     progressBar->setRange(0, 10000);
     progressBar->setValue(0);

     QTimer *timer = new QTimer(this);
     connect(timer, SIGNAL(timeout()), this, SLOT(advanceProgressBar()));
     timer->start(1000);
 }


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Qt 4.3.5