characterwidget.cpp Example File
widgets/charactermap/characterwidget.cpp
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** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
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** This file is part of the documentation of the Qt Toolkit.
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#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)
{
QPainter painter(this);
painter.fillRect(event->rect(), QBrush(Qt::white));
painter.setFont(displayFont);
QRect redrawRect = event->rect();
int beginRow = redrawRect.top()/24;
int endRow = redrawRect.bottom()/24;
int beginColumn = redrawRect.left()/24;
int endColumn = redrawRect.right()/24;
painter.setPen(QPen(Qt::gray));
for (int row = beginRow; row <= endRow; ++row) {
for (int column = beginColumn; column <= endColumn; ++column) {
painter.drawRect(column*24, row*24, 24, 24);
}
}
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*24, row*24, 24, 24);
if (key == lastKey)
painter.fillRect(column*24, row*24, 24, 24, QBrush(Qt::red));
painter.drawText(column*24 + 12 - fontMetrics.width(QChar(key))/2,
row*24 + 4 + fontMetrics.ascent(),
QString(QChar(key)));
}
}
}