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mainwindow.cpp Example File
widgets/charactermap/mainwindow.cpp

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 #include <QtGui>

 #include "characterwidget.h"
 #include "mainwindow.h"

 MainWindow::MainWindow()
 {
     QWidget *centralWidget = new QWidget;

     QLabel *fontLabel = new QLabel(tr("Font:"));
     fontCombo = new QFontComboBox;
     QLabel *sizeLabel = new QLabel(tr("Size:"));
     sizeCombo = new QComboBox;
     QLabel *styleLabel = new QLabel(tr("Style:"));
     styleCombo = new QComboBox;
     QLabel *fontMergingLabel = new QLabel(tr("Automatic Font Merging:"));
     fontMerging = new QCheckBox;
     fontMerging->setChecked(true);

     scrollArea = new QScrollArea;
     characterWidget = new CharacterWidget;
     scrollArea->setWidget(characterWidget);

     findStyles(fontCombo->currentFont());
     findSizes(fontCombo->currentFont());

     lineEdit = new QLineEdit;
     QPushButton *clipboardButton = new QPushButton(tr("&To clipboard"));

     clipboard = QApplication::clipboard();

     connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
             this, SLOT(findStyles(const QFont &)));
     connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
             this, SLOT(findSizes(const QFont &)));
     connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
             characterWidget, SLOT(updateFont(const QFont &)));
     connect(sizeCombo, SIGNAL(currentIndexChanged(const QString &)),
             characterWidget, SLOT(updateSize(const QString &)));
     connect(styleCombo, SIGNAL(currentIndexChanged(const QString &)),
             characterWidget, SLOT(updateStyle(const QString &)));
     connect(characterWidget, SIGNAL(characterSelected(const QString &)),
             this, SLOT(insertCharacter(const QString &)));
     connect(clipboardButton, SIGNAL(clicked()), this, SLOT(updateClipboard()));
     connect(fontMerging, SIGNAL(toggled(bool)), characterWidget, SLOT(updateFontMerging(bool)));

     QHBoxLayout *controlsLayout = new QHBoxLayout;
     controlsLayout->addWidget(fontLabel);
     controlsLayout->addWidget(fontCombo, 1);
     controlsLayout->addWidget(sizeLabel);
     controlsLayout->addWidget(sizeCombo, 1);
     controlsLayout->addWidget(styleLabel);
     controlsLayout->addWidget(styleCombo, 1);
     controlsLayout->addWidget(fontMergingLabel);
     controlsLayout->addWidget(fontMerging, 1);
     controlsLayout->addStretch(1);

     QHBoxLayout *lineLayout = new QHBoxLayout;
     lineLayout->addWidget(lineEdit, 1);
     lineLayout->addSpacing(12);
     lineLayout->addWidget(clipboardButton);

     QVBoxLayout *centralLayout = new QVBoxLayout;
     centralLayout->addLayout(controlsLayout);
     centralLayout->addWidget(scrollArea, 1);
     centralLayout->addSpacing(4);
     centralLayout->addLayout(lineLayout);
     centralWidget->setLayout(centralLayout);

     setCentralWidget(centralWidget);
     setWindowTitle(tr("Character Map"));
 }

 void MainWindow::findStyles(const QFont &font)
 {
     QFontDatabase fontDatabase;
     QString currentItem = styleCombo->currentText();
     styleCombo->clear();

     QString style;
     foreach (style, fontDatabase.styles(font.family()))
         styleCombo->addItem(style);

     int styleIndex = styleCombo->findText(currentItem);

     if (styleIndex == -1)
         styleCombo->setCurrentIndex(0);
     else
         styleCombo->setCurrentIndex(styleIndex);
 }

 void MainWindow::findSizes(const QFont &font)
 {
     QFontDatabase fontDatabase;
     QString currentSize = sizeCombo->currentText();
     sizeCombo->blockSignals(true);
     sizeCombo->clear();

     int size;
     if(fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) {
         foreach(size, QFontDatabase::standardSizes()) {
             sizeCombo->addItem(QVariant(size).toString());
             sizeCombo->setEditable(true);
         }

     } else {
         foreach(size, fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font))) {
             sizeCombo->addItem(QVariant(size).toString());
             sizeCombo->setEditable(false);
         }
     }

     sizeCombo->blockSignals(false);

     int sizeIndex = sizeCombo->findText(currentSize);

     if(sizeIndex == -1)
         sizeCombo->setCurrentIndex(qMax(0, sizeCombo->count() / 3));
     else
         sizeCombo->setCurrentIndex(sizeIndex);
 }

 void MainWindow::insertCharacter(const QString &character)
 {
     lineEdit->insert(character);
 }

 void MainWindow::updateClipboard()
 {
     clipboard->setText(lineEdit->text(), QClipboard::Clipboard);
     clipboard->setText(lineEdit->text(), QClipboard::Selection);
 }


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Qt 4.3.5