<?xml version="1.0" encoding="iso-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Qt 4.6: characterwidget.cpp Example File (widgets/charactermap/characterwidget.cpp)</title> <link href="classic.css" rel="stylesheet" type="text/css" /> </head> <body> <table border="0" cellpadding="0" cellspacing="0" width="100%"> <tr> <td align="left" valign="top" width="32"><a href="http://qt.nokia.com/"><img src="images/qt-logo.png" align="left" border="0" /></a></td> <td width="1"> </td><td class="postheader" valign="center"><a href="index.html"><font color="#004faf">Home</font></a> · <a href="classes.html"><font color="#004faf">All Classes</font></a> · <a href="functions.html"><font color="#004faf">All Functions</font></a> · <a href="overviews.html"><font color="#004faf">Overviews</font></a></td></tr></table><h1 class="title">characterwidget.cpp Example File<br /><span class="small-subtitle">widgets/charactermap/characterwidget.cpp</span> </h1> <pre><span class="comment"> /**************************************************************************** ** ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). ** All rights reserved. ** Contact: Nokia Corporation (qt-info@nokia.com) ** ** This file is part of the examples of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial Usage ** Licensees holding valid Qt Commercial licenses may use this file in ** accordance with the Qt Commercial License Agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and Nokia. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 2.1 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 2.1 requirements ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** In addition, as a special exception, Nokia gives you certain additional ** rights. These rights are described in the Nokia Qt LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** If you have questions regarding the use of this file, please contact ** Nokia at qt-info@nokia.com. ** $QT_END_LICENSE$ ** ****************************************************************************/</span> #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> <p /><address><hr /><div align="center"> <table width="100%" cellspacing="0" border="0"><tr class="address"> <td width="40%" align="left">Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)</td> <td width="20%" align="center"><a href="trademarks.html">Trademarks</a></td> <td width="40%" align="right"><div align="right">Qt 4.6.3</div></td> </tr></table></div></address></body> </html>