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Diffstat (limited to 'examples/widgets/charactermap/characterwidget.cpp')
| -rw-r--r-- | examples/widgets/charactermap/characterwidget.cpp | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/examples/widgets/charactermap/characterwidget.cpp b/examples/widgets/charactermap/characterwidget.cpp new file mode 100644 index 0000000..3409169 --- /dev/null +++ b/examples/widgets/charactermap/characterwidget.cpp @@ -0,0 +1,178 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** 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 1.0, 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 are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#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] |