C++/Qt/QTextDocument

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Adding resource to QTextDocument

  
/****************************************************************************
**
** 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>
QString tr(const char *text)
{
    return QApplication::translate(text, text);
}
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QTextEdit *editor = new QTextEdit;
    QTextDocument *document = new QTextDocument(editor);
    QTextCursor cursor(document);
    QImage image(64, 64, QImage::Format_RGB32);
    image.fill(qRgb(255, 160, 128));
//! [Adding a resource]
    document->addResource(QTextDocument::ImageResource,
        QUrl("mydata://image.png"), QVariant(image));
//! [Adding a resource]
//! [Inserting an image with a cursor]
    QTextImageFormat imageFormat;
    imageFormat.setName("mydata://image.png");
    cursor.insertImage(imageFormat);
//! [Inserting an image with a cursor]
    cursor.insertBlock();
    cursor.insertText("Code less. Create more.");
    editor->setDocument(document);
    editor->setWindowTitle(tr("Text Document Images"));
    editor->resize(320, 480);
    editor->show();
//! [Inserting an image using HTML]
    editor->append("<img src=\"mydata://image.png\" />");
//! [Inserting an image using HTML]
    return app.exec();
}


Draw QTextDocument with QTextDocument

  

Foundations of Qt Development\Chapter07\text\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 <QPixmap>
#include <QPainter>
#include <QTextDocument>
int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  QPixmap pixmap( 200, 330 );
  pixmap.fill( Qt::white );
  QPainter painter( &pixmap );
  painter.setPen( Qt::black );
    
  QPoint point = QPoint( 10, 20 );
  painter.drawText( point, "You can draw text from a point..." );
  painter.drawLine( point+QPoint(-5, 0), point+QPoint(5, 0) );
  painter.drawLine( point+QPoint(0, -5), point+QPoint(0, 5) );
  
  QRect rect = QRect(10, 30, 180, 20);
  painter.drawText( rect, Qt::AlignCenter, 
                    "...or you can draw it inside a rectangle." );
  painter.drawRect( rect );
  
  rect.translate( 0, 30 );
  
  QFont font = QApplication::font();
  font.setPixelSize( rect.height() );
  painter.setFont( font );
  
  painter.drawText( rect, Qt::AlignRight, "Right." );
  painter.drawText( rect, Qt::AlignLeft, "Left." );
  painter.drawRect( rect );
  
  rect.translate( 0, rect.height()+10 );
  rect.setHeight( QFontMetrics( font ).height() );
  painter.drawText( rect, Qt::AlignRight, "Right." );
  painter.drawText( rect, Qt::AlignLeft, "Left." );
  painter.drawRect( rect );
  
  QTextDocument doc;
  doc.setHtml( "<p>A QTextDocument can be used to present formatted text "
               "in a nice way.</p>"
               "<p align=center>It can be <b>formatted</b> "
               "<font size=+2>in</font> <i>different</i> ways.</p>"
               "<p>The text can be really long and contain many "
               "paragraphs. It is properly wrapped and such...</p>" );
  rect.translate( 0, rect.height()+10 );
  rect.setHeight( 160 );
  doc.setTextWidth( rect.width() );
  painter.save();
  painter.translate( rect.topLeft() );
  doc.drawContents( &painter, rect.translated( -rect.topLeft() ) );
  painter.restore();
  painter.drawRect( rect );
  rect.translate( 0, 160 );
  rect.setHeight( doc.size().height()-160 );
  painter.setBrush( Qt::gray );
  painter.drawRect( rect );
  pixmap.save( "text.png" );
  return 0;
}


Text document blocks

  
/****************************************************************************
**
** 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 XMLWRITER_H
#define XMLWRITER_H
#include <QDomDocument>
class QTextDocument;
class XmlWriter
{
public:
    XmlWriter(QTextDocument *document) : textDocument(document) {}
    QDomDocument *toXml();
private:
    void createItems(QDomElement &parent, const QTextBlock &block);
    QDomDocument *document;
    QTextDocument *textDocument;
};
#endif


#include <QtGui>
#include "xmlwriter.h"
QDomDocument *XmlWriter::toXml()
{
    QDomImplementation implementation;
    QDomDocumentType docType = implementation.createDocumentType(
        "scribe-document", "scribe", "qt,nokia.com/scribe");
    document = new QDomDocument(docType);
    // ### This processing instruction is required to ensure that any kind
    // of encoding is given when the document is written.
    QDomProcessingInstruction process = document->createProcessingInstruction(
        "xml", "version=\"1.0\" encoding=\"utf-8\"");
    document->appendChild(process);
    QDomElement documentElement = document->createElement("document");
    document->appendChild(documentElement);
    QTextBlock firstBlock = textDocument->begin();
    createItems(documentElement, firstBlock);
    return document;
}
void XmlWriter::createItems(QDomElement &parent, const QTextBlock &block)
{
    QTextBlock currentBlock = block;
    while (currentBlock.isValid()) {
        QDomElement blockElement = document->createElement("block");
        blockElement.setAttribute("length", currentBlock.length());
        parent.appendChild(blockElement);
        if (!(currentBlock.text().isNull())) {
            QDomText textNode = document->createTextNode(currentBlock.text());
            blockElement.appendChild(textNode);
        }
        currentBlock = currentBlock.next();
    }
}


#ifndef WINDOW_H
#define WINDOW_H
#include <QMainWindow>
class QTextEdit;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void insertCalendar();
    void saveFile();
private:
    bool writeXml(const QString &fileName);
    QTextEdit *editor;
};
#endif


#include <QtGui>
#include "mainwindow.h"
#include "xmlwriter.h"
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
    QAction *saveAction = fileMenu->addAction(tr("&Save..."));
    saveAction->setShortcut(tr("Ctrl+S"));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));
    QMenu *insertMenu = new QMenu(tr("&Insert"));
    QAction *calendarAction = insertMenu->addAction(tr("&Calendar"));
    calendarAction->setShortcut(tr("Ctrl+I"));
    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(insertMenu);

    editor = new QTextEdit(this);

    connect(saveAction, SIGNAL(triggered()), this, SLOT(saveFile()));
    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(calendarAction, SIGNAL(triggered()), this, SLOT(insertCalendar()));
    setCentralWidget(editor);
    setWindowTitle(tr("Text Document Writer"));
}
void MainWindow::saveFile()
{
    QString fileName = QFileDialog::getSaveFileName(this,
        tr("Save document as:"), "", tr("XML (*.xml)"));
    if (!fileName.isEmpty()) {
        if (writeXml(fileName))
            setWindowTitle(fileName);
        else
            QMessageBox::warning(this, tr("Warning"),
                tr("Failed to save the document."), QMessageBox::Cancel,
                QMessageBox::NoButton);
    }
}
void MainWindow::insertCalendar()
{
    QTextCursor cursor(editor->textCursor());
    cursor.movePosition(QTextCursor::Start); 
    QTextCharFormat format(cursor.charFormat());
    format.setFontFamily("Courier");
    
    QTextCharFormat boldFormat = format;
    boldFormat.setFontWeight(QFont::Bold);
    cursor.insertBlock();
    cursor.insertText(" ", boldFormat);
    QDate date = QDate::currentDate();
    int year = date.year(), month = date.month();
    for (int weekDay = 1; weekDay <= 7; ++weekDay) {
        cursor.insertText(QString("%1 ").arg(QDate::shortDayName(weekDay), 3),
            boldFormat);
    }
    cursor.insertBlock();
    cursor.insertText(" ", format);
    for (int column = 1; column < QDate(year, month, 1).dayOfWeek(); ++column) {
        cursor.insertText("    ", format);
    }
    for (int day = 1; day <= date.daysInMonth(); ++day) {
 
        int weekDay = QDate(year, month, day).dayOfWeek();
        if (QDate(year, month, day) == date)
            cursor.insertText(QString("%1 ").arg(day, 3), boldFormat);
        else
            cursor.insertText(QString("%1 ").arg(day, 3), format);
        if (weekDay == 7) {
            cursor.insertBlock();
            cursor.insertText(" ", format);
        }
 
    }
}
bool MainWindow::writeXml(const QString &fileName)
{
    XmlWriter documentWriter(editor->document());
    QDomDocument *domDocument = documentWriter.toXml();
    QFile file(fileName);
    if (file.open(QFile::WriteOnly)) {
        QTextStream textStream(&file);
        textStream.setCodec(QTextCodec::codecForName("UTF-8"));
        
        textStream << domDocument->toString(1).toUtf8();
        file.close();
        return true;
    }
    else
        return false;
}


#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->resize(640, 480);
    window->show();
    return app.exec();
}


Text document selection

  
/****************************************************************************
**
** 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 <QMainWindow>
#include <QTextDocumentFragment>
class QAction;
class QTextDocument;
class QTextEdit;
class MainWindow : public QMainWindow
{
    Q_OBJECT
public:
    MainWindow();
public slots:
    void cutSelection();
    void copySelection();
    void openFile();
    void pasteSelection();
    void selectWord();
    void selectLine();
    void selectBlock();
    void selectFrame();
    void updateMenus();
private:
    QAction *cutAction;
    QAction *copyAction;
    QAction *pasteAction;
    QString currentFile;
    QTextEdit *editor;
    QTextDocument *document;
    QTextDocumentFragment selection;
};
#endif



#include <QtGui>
#include "mainwindow.h"
MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));
    fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),
                        QKeySequence(tr("Ctrl+O", "File|Open")));
    QAction *quitAction = fileMenu->addAction(tr("E&xit"), this, SLOT(close()));
    quitAction->setShortcut(tr("Ctrl+Q"));
    QMenu *editMenu = new QMenu(tr("&Edit"));
    cutAction = editMenu->addAction(tr("Cu&t"), this, SLOT(cutSelection()));
    cutAction->setShortcut(tr("Ctrl+X"));
    cutAction->setEnabled(false);
    copyAction = editMenu->addAction(tr("&Copy"), this, SLOT(copySelection()));
    copyAction->setShortcut(tr("Ctrl+C"));
    copyAction->setEnabled(false);
    pasteAction = editMenu->addAction(tr("&Paste"), this, SLOT(pasteSelection()));
    pasteAction->setShortcut(tr("Ctrl+V"));
    pasteAction->setEnabled(false);
    QMenu *selectMenu = new QMenu(tr("&Select"));
    selectMenu->addAction(tr("&Word"), this, SLOT(selectWord()));
    selectMenu->addAction(tr("&Line"), this, SLOT(selectLine()));
    selectMenu->addAction(tr("&Block"), this, SLOT(selectBlock()));
    selectMenu->addAction(tr("&Frame"), this, SLOT(selectFrame()));
    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(editMenu);
    menuBar()->addMenu(selectMenu);
    editor = new QTextEdit(this);
    document = new QTextDocument(this);
    editor->setDocument(document);
    connect(editor, SIGNAL(selectionChanged()), this, SLOT(updateMenus()));
    setCentralWidget(editor);
    setWindowTitle(tr("Text Document Writer"));
}
void MainWindow::openFile()
{
    QString fileName = QFileDialog::getOpenFileName(this,
        tr("Open file"), currentFile, "HTML files (*.html);;Text files (*.txt)");
    
    if (!fileName.isEmpty()) {
        QFileInfo info(fileName);
        if (info.completeSuffix() == "html") {
            QFile file(fileName);
            
            if (file.open(QFile::ReadOnly)) {
                editor->setHtml(QString(file.readAll()));
                file.close();
                currentFile = fileName;
            }
        } else if (info.completeSuffix() == "txt") {
            QFile file(fileName);
            
            if (file.open(QFile::ReadOnly)) {
                editor->setPlainText(file.readAll());
                file.close();
                currentFile = fileName;
            }
        }
    }
}
void MainWindow::cutSelection()
{
    QTextCursor cursor = editor->textCursor();
    if (cursor.hasSelection()) {
        selection = cursor.selection();
        cursor.removeSelectedText();
    }
}
void MainWindow::copySelection()
{
    QTextCursor cursor = editor->textCursor();
    if (cursor.hasSelection()) {
        selection = cursor.selection();
        cursor.clearSelection();
    }
}
void MainWindow::pasteSelection()
{
    QTextCursor cursor = editor->textCursor();
    cursor.insertFragment(selection);
}
void MainWindow::selectWord()
{
    QTextCursor cursor = editor->textCursor();
    QTextBlock block = cursor.block();

    cursor.beginEditBlock();
    cursor.movePosition(QTextCursor::StartOfWord);
    cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
    cursor.endEditBlock();

    editor->setTextCursor(cursor);
}
void MainWindow::selectLine()
{
    QTextCursor cursor = editor->textCursor();
    QTextBlock block = cursor.block();
    cursor.beginEditBlock();
    cursor.movePosition(QTextCursor::StartOfLine);
    cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
    cursor.endEditBlock();
    editor->setTextCursor(cursor);
}
void MainWindow::selectBlock()
{
    QTextCursor cursor = editor->textCursor();
    QTextBlock block = cursor.block();
    cursor.beginEditBlock();
    cursor.movePosition(QTextCursor::StartOfBlock);
    cursor.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
    cursor.endEditBlock();
    editor->setTextCursor(cursor);
}
void MainWindow::selectFrame()
{
    QTextCursor cursor = editor->textCursor();
    QTextFrame *frame = cursor.currentFrame();
    cursor.beginEditBlock();
    cursor.setPosition(frame->firstPosition());
    cursor.setPosition(frame->lastPosition(), QTextCursor::KeepAnchor);
    cursor.endEditBlock();
    editor->setTextCursor(cursor);
}
void MainWindow::updateMenus()
{
    QTextCursor cursor = editor->textCursor();
    cutAction->setEnabled(cursor.hasSelection());
    copyAction->setEnabled(cursor.hasSelection());
    pasteAction->setEnabled(!selection.isEmpty());
}


#include <QtGui>
#include "mainwindow.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow *window = new MainWindow;
    window->resize(640, 480);
    window->show();
    return app.exec();
}