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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
** of its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#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]
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