C++/Qt/QTextDocument — различия между версиями
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Текущая версия на 10:24, 25 мая 2010
Содержание
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();
}