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

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

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        ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
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    ** 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
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        #include <QtGui>

        #include "characterwidget.h"

        CharacterWidget::CharacterWidget(QWidget *parent)
            : QWidget(parent)
        {
            lastKey = -1;
            setMouseTracking(true);
        }

        void CharacterWidget::updateFont(const QString &fontFamily)
        {
            displayFont.setFamily(fontFamily);
            displayFont.setPixelSize(16);
            update();
        }

        void CharacterWidget::updateStyle(const QString &fontStyle)
        {
            QFontDatabase fontDatabase;
            displayFont = fontDatabase.font(displayFont.family(), fontStyle, 12);
            displayFont.setPixelSize(16);
            update();
        }

        QSize CharacterWidget::sizeHint() const
        {
            return QSize(32*24, (65536/32)*24);
        }

        void CharacterWidget::mouseMoveEvent(QMouseEvent *event)
        {
            QPoint widgetPosition = mapFromGlobal(event->globalPos());
            int key = (widgetPosition.y()/24)*32 + widgetPosition.x()/24;
            QToolTip::showText(event->globalPos(), QString::number(key), this);
        }

        void CharacterWidget::mousePressEvent(QMouseEvent *event)
        {
            if (event->button() == Qt::LeftButton) {
                lastKey = (event->y()/24)*32 + event->x()/24;
                if (QChar(lastKey).category() != QChar::NoCategory)
                    emit characterSelected(QString(QChar(lastKey)));
                update();
            }
            else
                QWidget::mousePressEvent(event);
        }

        void CharacterWidget::paintEvent(QPaintEvent *event)
        {
            QPainter painter(this);
            painter.fillRect(event->rect(), QBrush(Qt::white));
            painter.setFont(displayFont);

            QRect redrawRect = event->rect();
            int beginRow = redrawRect.top()/24;
            int endRow = redrawRect.bottom()/24;
            int beginColumn = redrawRect.left()/24;
            int endColumn = redrawRect.right()/24;

            painter.setPen(QPen(Qt::gray));
            for (int row = beginRow; row <= endRow; ++row) {
                for (int column = beginColumn; column <= endColumn; ++column) {
                    painter.drawRect(column*24, row*24, 24, 24);
                }
            }

            QFontMetrics fontMetrics(displayFont);
            painter.setPen(QPen(Qt::black));
            for (int row = beginRow; row <= endRow; ++row) {

                for (int column = beginColumn; column <= endColumn; ++column) {

                    int key = row*32 + column;
                    painter.setClipRect(column*24, row*24, 24, 24);

                    if (key == lastKey)
                        painter.fillRect(column*24, row*24, 24, 24, QBrush(Qt::red));

                    painter.drawText(column*24 + 12 - fontMetrics.width(QChar(key))/2,
                                     row*24 + 4 + fontMetrics.ascent(),
                                     QString(QChar(key)));
                }
            }
        }