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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">characterwidget.cpp Example File<br /><small><small>widgets/charactermap/characterwidget.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing 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.

****************************************************************************/

#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)

{

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QPainter painter(this);

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painter.fillRect(event->rect(), QBrush(Qt::white));

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painter.setFont(displayFont);

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QRect redrawRect = event->rect();

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int beginRow = redrawRect.top()/24;

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int endRow = redrawRect.bottom()/24;

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int beginColumn = redrawRect.left()/24;

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int endColumn = redrawRect.right()/24;

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painter.setPen(QPen(Qt::gray));

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for (int row = beginRow; row <= endRow; ++row) {

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

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painter.drawRect(column*24, row*24, 24, 24);

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}

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}

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QFontMetrics fontMetrics(displayFont);

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painter.setPen(QPen(Qt::black));

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for (int row = beginRow; row <= endRow; ++row) {

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

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int key = row*32 + column;

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painter.setClipRect(column*24, row*24, 24, 24);

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if (key == lastKey)

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painter.fillRect(column*24, row*24, 24, 24, QBrush(Qt::red));

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painter.drawText(column*24 + 12 - fontMetrics.width(QChar(key))/2,

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row*24 + 4 + fontMetrics.ascent(),

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QString(QChar(key)));

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}

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}

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}</pre>

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