Qt 4.0: mainwindow.cpp Example File (widgets/charactermap/mainwindow.cpp)

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

        /****************************************************************************
        **
        ** Copyright (C) 2004-2005 Trolltech AS. 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:
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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 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(activated(const QString &)),
                    this, SLOT(findStyles()));
            connect(fontCombo, SIGNAL(activated(const QString &)),
                    characterWidget, SLOT(updateFont(const QString &)));
            connect(styleCombo, SIGNAL(activated(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);

            if (styleCombo->findText(currentItem) == -1)
                styleCombo->setCurrentIndex(0);
        }

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

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