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

        /****************************************************************************
        **
        ** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the example classes of the Qt Toolkit.
        **
        ** Licensees holding valid Qt Preview licenses may use this file in
        ** accordance with the Qt Preview License Agreement provided with the
        ** Software.
        **
        ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
        ** information about Qt Commercial License Agreements.
        **
        ** Contact info@trolltech.com if any conditions of this licensing are
        ** not clear to you.
        **
        ** 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"

        CharacterWidget::CharacterWidget(QWidget *parent)
            : QWidget(parent)
        {
            squareSize = 24;
            lastKey = -1;
            setMouseTracking(true);
        }

        void CharacterWidget::updateFont(const QFont &font)
        {
            displayFont.setFamily(font.family());
            squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
            adjustSize();
            update();
        }

        void CharacterWidget::updateSize(const QString &fontSize)
        {
            displayFont.setPointSize(fontSize.toInt());
            squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
            adjustSize();
            update();
        }

        void CharacterWidget::updateStyle(const QString &fontStyle)
        {
            QFontDatabase fontDatabase;
            const QFont::StyleStrategy oldStrategy = displayFont.styleStrategy();
            displayFont = fontDatabase.font(displayFont.family(), fontStyle, displayFont.pointSize());
            displayFont.setStyleStrategy(oldStrategy);
            squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
            adjustSize();
            update();
        }

        void CharacterWidget::updateFontMerging(bool enable)
        {
            if (enable)
                displayFont.setStyleStrategy(QFont::PreferDefault);
            else
                displayFont.setStyleStrategy(QFont::NoFontMerging);
            adjustSize();
            update();
        }

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

        void CharacterWidget::mouseMoveEvent(QMouseEvent *event)
        {
            QPoint widgetPosition = mapFromGlobal(event->globalPos());
            uint key = (widgetPosition.y()/squareSize)*32 + widgetPosition.x()/squareSize;

            QString text = QString::fromLatin1("<p>Character: <span style=\"font-size: 24pt; font-family: %1\">").arg(displayFont.family())
                          + QChar(key)
                          + QString::fromLatin1("</span><p>Value: 0x")
                          + QString::number(key, 16);
            QToolTip::showText(event->globalPos(), text, this);
        }

        void CharacterWidget::mousePressEvent(QMouseEvent *event)
        {
            if (event->button() == Qt::LeftButton) {
                lastKey = (event->y()/squareSize)*32 + event->x()/squareSize;
                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()/squareSize;
            int endRow = redrawRect.bottom()/squareSize;
            int beginColumn = redrawRect.left()/squareSize;
            int endColumn = redrawRect.right()/squareSize;

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

            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*squareSize, row*squareSize, squareSize, squareSize);

                    if (key == lastKey)
                        painter.fillRect(column*squareSize + 1, row*squareSize + 1, squareSize, squareSize, QBrush(Qt::red));

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