source: trunk/examples/widgets/charactermap/characterwidget.cpp@ 168

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#include <QtGui>

#include "characterwidget.h"

//! [0]
CharacterWidget::CharacterWidget(QWidget *parent)
    : QWidget(parent)
{
    squareSize = 24;
    columns = 16;
    lastKey = -1;
    setMouseTracking(true);
}
//! [0]

//! [1]
void CharacterWidget::updateFont(const QFont &font)
{
    displayFont.setFamily(font.family());
    squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
    adjustSize();
    update();
}
//! [1]

//! [2]
void CharacterWidget::updateSize(const QString &fontSize)
{
    displayFont.setPointSize(fontSize.toInt());
    squareSize = qMax(24, QFontMetrics(displayFont).xHeight() * 3);
    adjustSize();
    update();
}
//! [2]

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();
}

//! [3]
QSize CharacterWidget::sizeHint() const
{
    return QSize(columns*squareSize, (65536/columns)*squareSize);
}
//! [3]

//! [4]
void CharacterWidget::mouseMoveEvent(QMouseEvent *event)
{
    QPoint widgetPosition = mapFromGlobal(event->globalPos());
    uint key = (widgetPosition.y()/squareSize)*columns + 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);
}
//! [4]

//! [5]
void CharacterWidget::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        lastKey = (event->y()/squareSize)*columns + event->x()/squareSize;
        if (QChar(lastKey).category() != QChar::NoCategory)
            emit characterSelected(QString(QChar(lastKey)));
        update();
    }
    else
        QWidget::mousePressEvent(event);
}
//! [5]

//! [6]
void CharacterWidget::paintEvent(QPaintEvent *event)
{
    QPainter painter(this);
    painter.fillRect(event->rect(), QBrush(Qt::white));
    painter.setFont(displayFont);