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<pre> /****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
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** 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)
{
squareSize = 24;
columns = 16;
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(columns*squareSize, (65536/columns)*squareSize);
}
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);
}
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);
}
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*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)));
}
}
}</pre>
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