Qt 4.3: mainwindow.cpp Example File (widgets/charactermap/mainwindow.cpp)

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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);
     }