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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);

//! [6]

//! [7]

    QRect redrawRect = event->rect();

    int beginRow = redrawRect.top()/squareSize;

    int endRow = redrawRect.bottom()/squareSize;

    int beginColumn = redrawRect.left()/squareSize;

    int endColumn = redrawRect.right()/squareSize;

//! [7]

//! [8]

    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);

        }

//! [8] //! [9]

    }

//! [9]

//! [10]

    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*columns + 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)));

        }

    }

}

//! [10]