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* [[C++/Qt/Color Dialog | Color Dialog]]
* [[C++/Qt/Drag Drop | Drag Drop]]
* [[C++/Qt/Draw Shape | Draw Shape]]
* [[C++/Qt/Layout | Layout]]
* [[C++/Qt/Open File Dialog | Open File Dialog]]
* [[C++/Qt/QAbstractItemModel | QAbstractItemModel]]
* [[C++/Qt/QAbstractItemView | QAbstractItemView]]
* [[C++/Qt/QAbstractListModel | QAbstractListModel]]
* [[C++/Qt/QAbstractTableModel | QAbstractTableModel]]
* [[C++/Qt/QAction | QAction]]
* [[C++/Qt/QApplication | QApplication]]
* [[C++/Qt/QAssistantClient | QAssistantClient]]
* [[C++/Qt/QBrush | QBrush]]
* [[C++/Qt/QBuffer | QBuffer]]
* [[C++/Qt/QByteArray | QByteArray]]
* [[C++/Qt/QCalendarWidget | QCalendarWidget]]
* [[C++/Qt/QCheckBox | QCheckBox]]
* [[C++/Qt/QComboBox | QComboBox]]
* [[C++/Qt/QContextMenuEvent | QContextMenuEvent]]
* [[C++/Qt/QDBusMessage | QDBusMessage]]
* [[C++/Qt/QDataStream | QDataStream]]
* [[C++/Qt/QDate | QDate]]
* [[C++/Qt/QDesignerCustomWidgetInterface | QDesignerCustomWidgetInterface]]
* [[C++/Qt/QDialog | QDialog]]
* [[C++/Qt/QDir | QDir]]
* [[C++/Qt/QDirModel | QDirModel]]
* [[C++/Qt/QDockWidget | QDockWidget]]
* [[C++/Qt/QDomDocument | QDomDocument]]
* [[C++/Qt/QDomElement | QDomElement]]
* [[C++/Qt/QDomNode | QDomNode]]
* [[C++/Qt/QDoubleValidator | QDoubleValidator]]
* [[C++/Qt/QDrive | QDrive]]
* [[C++/Qt/QEvent | QEvent]]
* [[C++/Qt/QFile | QFile]]
* [[C++/Qt/QFileDialog | QFileDialog]]
* [[C++/Qt/QFileInfo | QFileInfo]]
* [[C++/Qt/QFocusEvent | QFocusEvent]]
* [[C++/Qt/QFrame | QFrame]]
* [[C++/Qt/QFtp | QFtp]]
* [[C++/Qt/QGraphicsItem | QGraphicsItem]]
* [[C++/Qt/QGraphicsPolygonItem | QGraphicsPolygonItem]]
* [[C++/Qt/QGraphicsRectItem | QGraphicsRectItem]]
* [[C++/Qt/QGraphicsView | QGraphicsView]]
* [[C++/Qt/QGridLayout | QGridLayout]]
* [[C++/Qt/QGroupBox | QGroupBox]]
* [[C++/Qt/QHBoxLayout | QHBoxLayout]]
* [[C++/Qt/QHash | QHash]]
* [[C++/Qt/QImage | QImage]]
* [[C++/Qt/QImageWriter | QImageWriter]]
* [[C++/Qt/QInputDialog | QInputDialog]]
* [[C++/Qt/QKeyEvent | QKeyEvent]]
* [[C++/Qt/QLCDNumber | QLCDNumber]]
* [[C++/Qt/QLabel | QLabel]]
* [[C++/Qt/QLayout | QLayout]]
* [[C++/Qt/QLineEdit | QLineEdit]]
* [[C++/Qt/QLinearGradient | QLinearGradient]]
* [[C++/Qt/QList | QList]]
* [[C++/Qt/QListIterator | QListIterator]]
* [[C++/Qt/QListView | QListView]]
* [[C++/Qt/QListWidget | QListWidget]]
* [[C++/Qt/QListWidgetItem | QListWidgetItem]]
* [[C++/Qt/QMap | QMap]]
* [[C++/Qt/QMenu | QMenu]]
* [[C++/Qt/QMessageBox | QMessageBox]]
* [[C++/Qt/QMouseEvent | QMouseEvent]]
* [[C++/Qt/QMovie | QMovie]]
* [[C++/Qt/QMultiHash | QMultiHash]]
* [[C++/Qt/QMultiMap | QMultiMap]]
* [[C++/Qt/QMutableIterators | QMutableIterators]]
* [[C++/Qt/QMutableListIterator | QMutableListIterator]]
* [[C++/Qt/QMutexLocker | QMutexLocker]]
* [[C++/Qt/QNetworkAccessManager | QNetworkAccessManager]]
* [[C++/Qt/QObject | QObject]]
* [[C++/Qt/QPainter | QPainter]]
* [[C++/Qt/QPalette | QPalette]]
* [[C++/Qt/QPen | QPen]]
* [[C++/Qt/QPixmap | QPixmap]]
* [[C++/Qt/QPlainTextEdit | QPlainTextEdit]]
* [[C++/Qt/QPointer | QPointer]]
* [[C++/Qt/QPrintDialog | QPrintDialog]]
* [[C++/Qt/QPrinter | QPrinter]]
* [[C++/Qt/QProcess | QProcess]]
* [[C++/Qt/QProgressBar | QProgressBar]]
* [[C++/Qt/QPushButton | QPushButton]]
* [[C++/Qt/QQueue | QQueue]]
* [[C++/Qt/QRadialGradient | QRadialGradient]]
* [[C++/Qt/QRadioButton | QRadioButton]]
* [[C++/Qt/QReadWriteLock | QReadWriteLock]]
* [[C++/Qt/QRegExp | QRegExp]]
* [[C++/Qt/QRegExpValidator | QRegExpValidator]]
* [[C++/Qt/QScriptEngine | QScriptEngine]]
* [[C++/Qt/QSemaphore | QSemaphore]]
* [[C++/Qt/QSet | QSet]]
* [[C++/Qt/QSlider | QSlider]]
* [[C++/Qt/QSortFilterProxyModel | QSortFilterProxyModel]]
* [[C++/Qt/QSpinBox | QSpinBox]]
* [[C++/Qt/QSplashScreen | QSplashScreen]]
* [[C++/Qt/QSplitter | QSplitter]]
* [[C++/Qt/QSqlDatabase | QSqlDatabase]]
* [[C++/Qt/QSqlRelationalTableModel | QSqlRelationalTableModel]]
* [[C++/Qt/QSqlTableModel | QSqlTableModel]]
* [[C++/Qt/QStack | QStack]]
* [[C++/Qt/QStackedLayout | QStackedLayout]]
* [[C++/Qt/QStackedWidget | QStackedWidget]]
* [[C++/Qt/QStandardItem | QStandardItem]]
* [[C++/Qt/QStandardItemModel | QStandardItemModel]]
* [[C++/Qt/QStatusBar | QStatusBar]]
* [[C++/Qt/QString | QString]]
* [[C++/Qt/QStringList | QStringList]]
* [[C++/Qt/QStringListModel | QStringListModel]]
* [[C++/Qt/QStyle | QStyle]]
* [[C++/Qt/QSvgWidget | QSvgWidget]]
* [[C++/Qt/QSystemTrayIcon | QSystemTrayIcon]]
* [[C++/Qt/QTabWidget | QTabWidget]]
* [[C++/Qt/QTableView | QTableView]]
* [[C++/Qt/QTableWidget | QTableWidget]]
* [[C++/Qt/QTabletEvent | QTabletEvent]]
* [[C++/Qt/QTcpServer | QTcpServer]]
* [[C++/Qt/QTcpSocket | QTcpSocket]]
* [[C++/Qt/QTest | QTest]]
* [[C++/Qt/QTextBlockFormat | QTextBlockFormat]]
* [[C++/Qt/QTextBrowser | QTextBrowser]]
* [[C++/Qt/QTextCharFormat | QTextCharFormat]]
* [[C++/Qt/QTextCursor | QTextCursor]]
* [[C++/Qt/QTextDocument | QTextDocument]]
* [[C++/Qt/QTextEdit | QTextEdit]]
* [[C++/Qt/QTextFrame | QTextFrame]]
* [[C++/Qt/QTextImageFormat | QTextImageFormat]]
* [[C++/Qt/QTextList | QTextList]]
* [[C++/Qt/QTextStream | QTextStream]]
* [[C++/Qt/QTextTableFormat | QTextTableFormat]]
* [[C++/Qt/QThread | QThread]]
* [[C++/Qt/QTime | QTime]]
* [[C++/Qt/QTimeLine | QTimeLine]]
* [[C++/Qt/QTimer | QTimer]]
* [[C++/Qt/QToolBar | QToolBar]]
* [[C++/Qt/QTranslator | QTranslator]]
* [[C++/Qt/QTreeView | QTreeView]]
* [[C++/Qt/QTreeWidget | QTreeWidget]]
* [[C++/Qt/QTreeWidgetItem | QTreeWidgetItem]]
* [[C++/Qt/QUdpSocket | QUdpSocket]]
* [[C++/Qt/QUiLoader | QUiLoader]]
* [[C++/Qt/QVBoxLayout | QVBoxLayout]]
* [[C++/Qt/QVector | QVector]]
* [[C++/Qt/QWhatsThis | QWhatsThis]]
* [[C++/Qt/QWidget | QWidget]]
* [[C++/Qt/QWindowsStyle | QWindowsStyle]]
* [[C++/Qt/QWizard | QWizard]]
* [[C++/Qt/QX11EmbedContainer | QX11EmbedContainer]]
* [[C++/Qt/QX11EmbedWidget | QX11EmbedWidget]]
* [[C++/Qt/QXmlDefaultHandler | QXmlDefaultHandler]]
* [[C++/Qt/QXmlStreamWriter | QXmlStreamWriter]]
* [[C++/Qt/Signal | Signal]]
* [[C++/Qt/Sqlite | Sqlite]]
* [[C++/Qt/ToolTip | ToolTip]]
* [[C++/Qt/Window | Window]]
* [[C++/Qt/foreach | foreach]]
* [[C++/Qt/qBinaryFind | qBinaryFind]]
* [[C++/Qt/qCopyBackward | qCopyBackward]]
* [[C++/Qt/qDebug | qDebug]]
* [[C++/Qt/qLowerBound | qLowerBound]]
* [[C++/Qt/qMin | qMin]]
* [[C++/Qt/qSort | qSort]]

==character painter widget==

<source lang="cpp">

/****************************************************************************
**
** Copyright (C) 2009 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.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef CHARACTERWIDGET_H
#define CHARACTERWIDGET_H
#include <QFont>
#include <QPoint>
#include <QSize>
#include <QString>
#include <QWidget>
QT_BEGIN_NAMESPACE
class QMouseEvent;
class QPaintEvent;
QT_END_NAMESPACE

class CharacterWidget : public QWidget
{
Q_OBJECT
public:
CharacterWidget(QWidget *parent = 0);
QSize sizeHint() const;
public slots:
void updateFont(const QFont &font);
void updateSize(const QString &fontSize);
void updateStyle(const QString &fontStyle);
void updateFontMerging(bool enable);
signals:
void characterSelected(const QString &character);
protected:
void mouseMoveEvent(QMouseEvent *event);
void mousePressEvent(QMouseEvent *event);
void paintEvent(QPaintEvent *event);
private:
QFont displayFont;
int columns;
int lastKey;
int squareSize;
};

#endif

#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)));
}
}
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QString>
QT_BEGIN_NAMESPACE
class QClipboard;
class QComboBox;
class QFontComboBox;
class QLineEdit;
class QScrollArea;
class QCheckBox;
QT_END_NAMESPACE
class CharacterWidget;

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow();
public slots:
void findStyles(const QFont &font);
void findSizes(const QFont &font);
void insertCharacter(const QString &character);
void updateClipboard();
private:
CharacterWidget *characterWidget;
QClipboard *clipboard;
QComboBox *styleCombo;
QComboBox *sizeCombo;
QFontComboBox *fontCombo;
QLineEdit *lineEdit;
QScrollArea *scrollArea;
QCheckBox *fontMerging;
};

#endif

#include <QtGui>
#include "characterwidget.h"
#include "mainwindow.h"

MainWindow::MainWindow()
{
QWidget *centralWidget = new QWidget;
QLabel *fontLabel = new QLabel(tr("Font:"));
fontCombo = new QFontComboBox;
QLabel *sizeLabel = new QLabel(tr("Size:"));
sizeCombo = new QComboBox;
QLabel *styleLabel = new QLabel(tr("Style:"));
styleCombo = new QComboBox;
QLabel *fontMergingLabel = new QLabel(tr("Automatic Font Merging:"));
fontMerging = new QCheckBox;
fontMerging->setChecked(true);
scrollArea = new QScrollArea;
characterWidget = new CharacterWidget;
scrollArea->setWidget(characterWidget);

findStyles(fontCombo->currentFont());
findSizes(fontCombo->currentFont());

lineEdit = new QLineEdit;
QPushButton *clipboardButton = new QPushButton(tr("&To clipboard"));

clipboard = QApplication::clipboard();

connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
this, SLOT(findStyles(const QFont &)));
connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
this, SLOT(findSizes(const QFont &)));
connect(fontCombo, SIGNAL(currentFontChanged(const QFont &)),
characterWidget, SLOT(updateFont(const QFont &)));
connect(sizeCombo, SIGNAL(currentIndexChanged(const QString &)),
characterWidget, SLOT(updateSize(const QString &)));
connect(styleCombo, SIGNAL(currentIndexChanged(const QString &)),
characterWidget, SLOT(updateStyle(const QString &)));

connect(characterWidget, SIGNAL(characterSelected(const QString &)),
this, SLOT(insertCharacter(const QString &)));
connect(clipboardButton, SIGNAL(clicked()), this, SLOT(updateClipboard()));
connect(fontMerging, SIGNAL(toggled(bool)), characterWidget, SLOT(updateFontMerging(bool)));

QHBoxLayout *controlsLayout = new QHBoxLayout;
controlsLayout->addWidget(fontLabel);
controlsLayout->addWidget(fontCombo, 1);
controlsLayout->addWidget(sizeLabel);
controlsLayout->addWidget(sizeCombo, 1);
controlsLayout->addWidget(styleLabel);
controlsLayout->addWidget(styleCombo, 1);
controlsLayout->addWidget(fontMergingLabel);
controlsLayout->addWidget(fontMerging, 1);
controlsLayout->addStretch(1);
QHBoxLayout *lineLayout = new QHBoxLayout;
lineLayout->addWidget(lineEdit, 1);
lineLayout->addSpacing(12);
lineLayout->addWidget(clipboardButton);
QVBoxLayout *centralLayout = new QVBoxLayout;
centralLayout->addLayout(controlsLayout);
centralLayout->addWidget(scrollArea, 1);
centralLayout->addSpacing(4);
centralLayout->addLayout(lineLayout);
centralWidget->setLayout(centralLayout);
setCentralWidget(centralWidget);
setWindowTitle(tr("Character Map"));
}

void MainWindow::findStyles(const QFont &font)
{
QFontDatabase fontDatabase;
QString currentItem = styleCombo->currentText();
styleCombo->clear();

QString style;
foreach (style, fontDatabase.styles(font.family()))
styleCombo->addItem(style);
int styleIndex = styleCombo->findText(currentItem);
if (styleIndex == -1)
styleCombo->setCurrentIndex(0);
else
styleCombo->setCurrentIndex(styleIndex);
}

void MainWindow::findSizes(const QFont &font)
{
QFontDatabase fontDatabase;
QString currentSize = sizeCombo->currentText();
sizeCombo->blockSignals(true);
sizeCombo->clear();
int size;
if(fontDatabase.isSmoothlyScalable(font.family(), fontDatabase.styleString(font))) {
foreach(size, QFontDatabase::standardSizes()) {
sizeCombo->addItem(QVariant(size).toString());
sizeCombo->setEditable(true);
}
} else {
foreach(size, fontDatabase.smoothSizes(font.family(), fontDatabase.styleString(font))) {
sizeCombo->addItem(QVariant(size).toString());
sizeCombo->setEditable(false);
}
}
sizeCombo->blockSignals(false);
int sizeIndex = sizeCombo->findText(currentSize);
if(sizeIndex == -1)
sizeCombo->setCurrentIndex(qMax(0, sizeCombo->count() / 3));
else
sizeCombo->setCurrentIndex(sizeIndex);
}

void MainWindow::insertCharacter(const QString &character)
{
lineEdit->insert(character);
}

void MainWindow::updateClipboard()
{
clipboard->setText(lineEdit->text(), QClipboard::Clipboard);
clipboard->setText(lineEdit->text(), QClipboard::Selection);
}

#include <QApplication>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow window;
window.show();
return app.exec();
}

</source>

==Create QFont==

<source lang="cpp">
Foundations of Qt Development\Chapter07\paths\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#include <QApplication>
#include <QPainter>
#include <QPainterPath>
#include <QPixmap>
int main( int argc, char **argv )
{
QApplication app( argc, argv );

QPixmap pixmap( 200, 200 );
pixmap.fill( Qt::white );

QPainterPath path;

path.addEllipse( 80, 80, 80, 80 );

path.moveTo( 120, 120 );
path.lineTo( 120, 40 );
path.arcTo( 40, 40, 160, 160, 90, 90 );
path.lineTo( 120, 120 );

QFont font = QApplication::font();
font.setPixelSize( 40 );

path.addText( 20, 180, font, "Path" );

QPainter painter( &pixmap );
painter.setRenderHint( QPainter::Antialiasing );

painter.setPen( Qt::black );
painter.setBrush( Qt::gray );

painter.drawPath( path );

pixmap.save( "path.png" );

return 0;
}

</source>

==Font dialog demo==

<source lang="cpp">

Chapter03\colorandfont\main.cpp
/*
* Copyright (c) 2006-2007, Johan Thelin
*
* All rights reserved.
*
* 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 APress 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.
*
*/
#include <QApplication>
#include <QFontDialog>
#include <QColorDialog>
class Tester : public QWidget
{
public:
void doColor()
{
QColor color = QColorDialog::getColor(Qt::yellow, this );
if( color.isValid() )
{
qDebug( "ok" );
}
}

void doFont()
{
bool ok;
QFont font = QFontDialog::getFont(
&ok,
QFont( "Arial", 18 ),
this,
tr("Pick a font") );
if( ok )
{
qDebug( "ok" );
}
}
};
int main( int argc, char **argv )
{
QApplication app( argc, argv );

Tester t;
t.doColor();
t.doFont();

return 0;
}

</source>

==plain text layout==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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.
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
protected:
void paintEvent(QPaintEvent *event);
private:
QFont font;
QString text;
};
#endif

#include <QtGui>
#include <math.h>
#include "window.h"
Window::Window(QWidget *parent)
: QWidget(parent)
{
text = QString("Support for text rendering and layout in Qt 4 has been "
"redesigned around a system that allows textual content to "
"be represented in a more flexible way than was possible "
"with Qt 3. Qt 4 also provides a more convenient "
"programming interface for editing documents. These "
"improvements are made available through a reimplementation "
"of the existing text rendering engine, and the "
"introduction of several new classes. "
"See the relevant module overview for a detailed discussion "
"of this framework. The following sections provide a brief "
"overview of the main concepts behind Scribe.");
setWindowTitle(tr("Plain Text Layout"));
}
void Window::paintEvent(QPaintEvent *event)
{
QTextLayout textLayout(text, font);
qreal margin = 10;
qreal radius = qMin(width()/2.0, height()/2.0) - margin;
QFontMetrics fm(font);
qreal lineHeight = fm.height();
qreal y = 0;
textLayout.beginLayout();
while (1) {
// create a new line
QTextLine line = textLayout.createLine();
if (!line.isValid())
break;
qreal x1 = qMax(0.0, pow(pow(radius,2)-pow(radius-y,2), 0.5));
qreal x2 = qMax(0.0, pow(pow(radius,2)-pow(radius-(y+lineHeight),2), 0.5));
qreal x = qMax(x1, x2) + margin;
qreal lineWidth = (width() - margin) - x;
line.setLineWidth(lineWidth);
line.setPosition(QPointF(x, margin+y));
y += line.height();
}
textLayout.endLayout();
QPainter painter;
painter.begin(this);
painter.setRenderHint(QPainter::Antialiasing);
painter.fillRect(rect(), Qt::white);
painter.setBrush(QBrush(Qt::black));
painter.setPen(QPen(Qt::black));
textLayout.draw(&painter, QPoint(0,0));
painter.setBrush(QBrush(QColor("#a6ce39")));
painter.setPen(QPen(Qt::black));
painter.drawEllipse(QRectF(-radius, margin, 2*radius, 2*radius));
painter.end();
}

#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Window *window = new Window;
window->resize(337, 343);
window->show();
return app.exec();
}

</source>

==QFontDatabase and QTreeWidget==

<source lang="cpp">
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation 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.
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtGui>
int main(int argc, char **argv)
{
QApplication app(argc, argv);

QFontDatabase database;
QTreeWidget fontTree;
fontTree.setColumnCount(2);
fontTree.setHeaderLabels(QStringList() << "Font" << "Smooth Sizes");
foreach (QString family, database.families()) {
QTreeWidgetItem *familyItem = new QTreeWidgetItem(&fontTree);
familyItem->setText(0, family);
foreach (QString style, database.styles(family)) {
QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);
styleItem->setText(0, style);
QString sizes;
foreach (int points, database.smoothSizes(family, style))
sizes += QString::number(points) + " ";
styleItem->setText(1, sizes.trimmed());
}

}

fontTree.resizeColumnToContents(0);
fontTree.show();
return app.exec();
}

</source>

C++/Qt - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...

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