mainwindow.cpp Example File
^{widgets/charactermap/mainwindow.cpp}

    /****************************************************************************
    **
    ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
    ** sales department at sales@trolltech.com.
    **
    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #include <QtGui>

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

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

        QLabel *fontLabel = new QLabel(tr("Font:"));
        fontCombo = new QComboBox;
        QLabel *styleLabel = new QLabel(tr("Style:"));
        styleCombo = new QComboBox;

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

        findFonts();
        findStyles();

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

        clipboard = QApplication::clipboard();

        connect(fontCombo, SIGNAL(currentIndexChanged(const QString &)),
                this, SLOT(findStyles()));
        connect(fontCombo, SIGNAL(currentIndexChanged(const QString &)),
                characterWidget, SLOT(updateFont(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()));

        QHBoxLayout *controlsLayout = new QHBoxLayout;
        controlsLayout->addWidget(fontLabel);
        controlsLayout->addWidget(fontCombo, 1);
        controlsLayout->addWidget(styleLabel);
        controlsLayout->addWidget(styleCombo, 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::findFonts()
    {
        QFontDatabase fontDatabase;
        fontCombo->clear();

        QString family;
        foreach (family, fontDatabase.families())
            fontCombo->addItem(family);
    }

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

        QString style;
        foreach (style, fontDatabase.styles(fontCombo->currentText()))
            styleCombo->addItem(style);

        int styleIndex = styleCombo->findText(currentItem);

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

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

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