C++/Qt/QTextEdit

extends QTextEdit

  
Foundations of Qt Development\Chapter04\mdi\documentwindow.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 <QMenuBar>
#include <QToolBar>
#include <QStatusBar>
#include <QCloseEvent>
#include <QMessageBox>
#include <QTextEdit>
#include "documentwindow.h"
DocumentWindow::DocumentWindow( QWidget *parent ) : QTextEdit( parent )
{
  setAttribute( Qt::WA_DeleteOnClose );
  setWindowTitle( tr("%1[*]" ).arg("unnamed") );
  
  connect( document(), SIGNAL(modificationChanged(bool)), this, SLOT(setWindowModified(bool)) );
}
  
void DocumentWindow::closeEvent( QCloseEvent *event )
{
  if( isSafeToClose() )
    event->accept();
  else
    event->ignore();
}
bool DocumentWindow::isSafeToClose()
{
  if( document()->isModified() ) 
  {
    switch( QMessageBox::warning( this, tr("MDI"), 
      tr("The document has unsaved changes.\n"
         "Do you want to save it before it is closed?"), 
         QMessageBox::Discard | QMessageBox::Cancel ) )
    {
    case QMessageBox::Cancel:
      return false;
    default:
      return true;
    }
  }
  return true;
}

Foundations of Qt Development\Chapter04\mdi\documentwindow.h
/*
 * 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.
 *
 */
#ifndef DOCUMENTWINDOW_H
#define DOCUMENTWINDOW_H
#include <QTextEdit>
class DocumentWindow : public QTextEdit
{
  Q_OBJECT
  
public:
  DocumentWindow( QWidget *parent = 0 );
  
protected:
  void closeEvent( QCloseEvent *event );
  
private:
  bool isSafeToClose();
};
  
#endif // DOCUMENTWINDOW_H

Foundations of Qt Development\Chapter04\mdi\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 "mdiwindow.h"
int main( int argc, char **argv )
{
  QApplication app( argc, argv );
  
  MdiWindow win;
  win.show();
  
  return app.exec();
}

Foundations of Qt Development\Chapter04\mdi\mdiwindow.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 <QMenuBar>
#include <QToolBar>
#include <QStatusBar>
#include <QCloseEvent>
#include <QMessageBox>
#include <QWorkspace>
#include <QSignalMapper>
#include "mdiwindow.h"
#include "documentwindow.h"
MdiWindow::MdiWindow( QWidget *parent ) : QMainWindow( parent )
{
  setWindowTitle( tr( "MDI" ) );
  workspace = new QWorkspace;
  setCentralWidget( workspace );
  
  connect( workspace, SIGNAL(windowActivated(QWidget *)), this, SLOT(enableActions()));
  mapper = new QSignalMapper( this );
  connect( mapper, SIGNAL(mapped(QWidget*)), workspace, SLOT(setActiveWindow(QWidget*)) );
  createActions();
  createMenus();
  createToolbars();
  statusBar()->showMessage( tr("Done") );
  
  enableActions();
}
  
void MdiWindow::closeEvent( QCloseEvent *event )
{
  workspace->closeAllWindows();
  if( !activeDocument() )
    event->accept();
  else
    event->ignore();
}
  
void MdiWindow::fileNew()
{
  DocumentWindow *document = new DocumentWindow;
  workspace->addWindow( document );
  connect( document, SIGNAL(copyAvailable(bool)), cutAction, SLOT(setEnabled(bool)) );
  connect( document, SIGNAL(copyAvailable(bool)), copyAction, SLOT(setEnabled(bool)) );
  
  document->show();
}
void MdiWindow::helpAbout()
{
  QMessageBox::about( this, tr("About MDI"), tr("A multiple document interface application.") );
}
DocumentWindow *MdiWindow::activeDocument()
{
  return qobject_cast<DocumentWindow*>(workspace->activeWindow());
}
void MdiWindow::enableActions()
{
  bool hasDocuments = (activeDocument() != 0 );
  
  closeAction->setEnabled( hasDocuments );  
  pasteAction->setEnabled( hasDocuments );  
  tileAction->setEnabled( hasDocuments );
  cascadeAction->setEnabled( hasDocuments );
  nextAction->setEnabled( hasDocuments );
  previousAction->setEnabled( hasDocuments );
  separatorAction->setVisible( hasDocuments );
  bool hasSelection = hasDocuments && activeDocument()->textCursor().hasSelection();
  cutAction->setEnabled( hasSelection );  
  copyAction->setEnabled( hasSelection );  
}
void MdiWindow::createActions()
{
  newAction = new QAction( QIcon(":/images/new.png"), tr("&New"), this );
  newAction->setShortcut( tr("Ctrl+N") );
  newAction->setStatusTip( tr("Create a new document") );
  connect( newAction, SIGNAL(triggered()), this, SLOT(fileNew()) );
  
  closeAction = new QAction( tr("&Close"), this );
  closeAction->setShortcut( tr("Ctrl+W") );
  closeAction->setStatusTip( tr("Close this document") );
  connect( closeAction, SIGNAL(triggered()), workspace, SLOT(closeActiveWindow()) );
  exitAction = new QAction( tr("E&xit"), this );
  exitAction->setShortcut( tr("Ctrl+Q") );
  exitAction->setStatusTip( tr("Quit the application") );
  connect( exitAction, SIGNAL(triggered()), qApp, SLOT(closeAllWindows()) );
  
  cutAction = new QAction( QIcon(":/images/cut.png"), tr("Cu&t"), this );
  cutAction->setShortcut( tr("Ctrl+X") );
  cutAction->setStatusTip( tr("Cut") );
  cutAction->setEnabled(false);
  connect( cutAction, SIGNAL(triggered()), this, SLOT(editCut()) );
  
  copyAction = new QAction( QIcon(":/images/copy.png"), tr("&Copy"), this );
  copyAction->setShortcut( tr("Ctrl+C") );
  copyAction->setStatusTip( tr("Copy") );
  copyAction->setEnabled(false);
  connect( copyAction, SIGNAL(triggered()), this, SLOT(editCopy()) );
  pasteAction = new QAction( QIcon(":/images/paste.png"), tr("&Paste"), this );
  pasteAction->setShortcut( tr("Ctrl+V") );
  pasteAction->setStatusTip( tr("Paste") );
  connect( pasteAction, SIGNAL(triggered()), this, SLOT(editPaste()) );
  
  tileAction = new QAction( tr("&Tile"), this );
  tileAction->setStatusTip( tr("Tile the windows") );
  connect( tileAction, SIGNAL(triggered()), workspace, SLOT(tile()) );
  
  cascadeAction = new QAction( tr("&Cascade"), this );
  cascadeAction->setStatusTip( tr("Cascade the windows") );
  connect( cascadeAction, SIGNAL(triggered()), workspace, SLOT(cascade()) );
  nextAction = new QAction( tr("&Next window"), this );
  nextAction->setStatusTip( tr("Move to the next window") );
  connect( nextAction, SIGNAL(triggered()), workspace, SLOT(activateNextWindow()) );
  
  previousAction = new QAction( tr("&Previous window"), this );
  previousAction->setStatusTip( tr("Move to the previous window") );
  connect( previousAction, SIGNAL(triggered()), workspace, SLOT(activatePreviousWindow()) );
  
  separatorAction = new QAction( this );
  separatorAction->setSeparator( true );
  
  aboutAction = new QAction( tr("&About"), this );
  aboutAction->setStatusTip( tr("About this application") );
  connect( aboutAction, SIGNAL(triggered()), this, SLOT(helpAbout()) );
  aboutQtAction = new QAction( tr("About &Qt"), this );
  aboutQtAction->setStatusTip( tr("About the Qt toolkit") );
  connect( aboutQtAction, SIGNAL(triggered()), qApp, SLOT(aboutQt()) );
}
void MdiWindow::createMenus()
{
  QMenu *menu;
  
  menu = menuBar()->addMenu( tr("&File") );
  menu->addAction( newAction );
  menu->addAction( closeAction );
  menu->addSeparator();
  menu->addAction( exitAction );
  
  menu = menuBar()->addMenu( tr("&Edit") );
  menu->addAction( cutAction );
  menu->addAction( copyAction );
  menu->addAction( pasteAction );
  
  windowMenu = menuBar()->addMenu( tr("&Window") );
  connect( windowMenu, SIGNAL(aboutToShow()), this, SLOT(updateWindowList()) );
  
  menu = menuBar()->addMenu( tr("&Help") );
  menu->addAction( aboutAction );
  menu->addAction( aboutQtAction );
}
void MdiWindow::createToolbars()
{
  QToolBar *toolbar;
  
  toolbar = addToolBar( tr("File") );
  toolbar->addAction( newAction );
  
  toolbar = addToolBar( tr("Edit") );
  toolbar->addAction( cutAction );
  toolbar->addAction( copyAction );
  toolbar->addAction( pasteAction );
}
void MdiWindow::editCut()
{
  activeDocument()->cut();
}
  
void MdiWindow::editCopy()
{
  activeDocument()->copy();
}
  
void MdiWindow::editPaste()
{
  activeDocument()->paste();
}
void MdiWindow::updateWindowList()
{
  windowMenu->clear();
  
  windowMenu->addAction( tileAction );
  windowMenu->addAction( cascadeAction );
  windowMenu->addSeparator();
  windowMenu->addAction( nextAction );
  windowMenu->addAction( previousAction );
  windowMenu->addAction( separatorAction );
  
  int i=1;
  foreach( QWidget *w, workspace->windowList() )
  {
    QString text;
    if( i<10 )
      text = tr("&%1 %2").arg( i++ ).arg( w->windowTitle() );
    else
      text = w->windowTitle();
      
    QAction *action = windowMenu->addAction( text );
    action->setCheckable( true );
    action->setChecked( w == activeDocument() );
    connect( action, SIGNAL(triggered()), mapper, SLOT(map()) );
    mapper->setMapping( action, w );
  }
}

Foundations of Qt Development\Chapter04\mdi\mdiwindow.h
/*
 * 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.
 *
 */
#ifndef MDIWINDOW_H
#define MDIWINDOW_H
#include <QMainWindow>
class QAction;
class QWorkspace;
class QSignalMapper;
class QMenu;
class DocumentWindow;
class MdiWindow : public QMainWindow
{
  Q_OBJECT
  
public:
  MdiWindow( QWidget *parent = 0 );
  
protected:
  void closeEvent( QCloseEvent *event );
  
private slots:
  void fileNew();
  
  void editCut();
  void editCopy();
  void editPaste();
  
  void helpAbout();
  
  void enableActions();
  void updateWindowList();
private:
  void createActions();
  void createMenus();
  void createToolbars();
  DocumentWindow *activeDocument();
  QWorkspace *workspace;
  QSignalMapper *mapper;
  
  QAction *newAction;
  QAction *closeAction;
  QAction *exitAction;
  
  QAction *cutAction;
  QAction *copyAction;
  QAction *pasteAction;
  
  QAction *tileAction;
  QAction *cascadeAction;
  QAction *nextAction;
  QAction *previousAction;
  QAction *separatorAction;
  
  QAction *aboutAction;
  QAction *aboutQtAction;
  
  QMenu *windowMenu;
};
  
#endif // MDIWINDOW_H

QTextEdit and QTextCursor

  
/****************************************************************************
**
** 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>
void mergeFormat(QTextEdit *edit)
{
    QTextDocument *document = edit->document(); 
    QTextCursor cursor(document);
    cursor.movePosition(QTextCursor::Start); 
    cursor.movePosition(QTextCursor::EndOfLine, QTextCursor::KeepAnchor);
    QTextCharFormat format;
    format.setFontWeight(QFont::Bold);
    cursor.mergeCharFormat(format);
}
int main(int argc, char *argv[])
{
    QWidget *parent = 0;
    QString aStringContainingHTMLtext("<h1>Scribe Overview</h1>");
    QApplication app(argc, argv);

    QTextEdit *editor = new QTextEdit(parent);
    editor->setHtml(aStringContainingHTMLtext);
    editor->show();

    return app.exec();
}

Using QTextEdit

  
/****************************************************************************
**
** 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 TEXTEDIT_H
#define TEXTEDIT_H
#include <QTextEdit>
class TextEdit : public QTextEdit
{
    Q_OBJECT
    
public: 
    TextEdit(QWidget *parent=0);
    bool canInsertFromMimeData( const QMimeData *source ) const;
    void insertFromMimeData( const QMimeData *source );
};
#endif



#include "textedit.h"
#include <QtGui>
TextEdit::TextEdit(QWidget *parent)
  : QTextEdit(parent)
{
}

bool TextEdit::canInsertFromMimeData( const QMimeData *source ) const
{
    if (source->hasImage())
        return true;
    else
        return QTextEdit::canInsertFromMimeData(source);
}

void TextEdit::insertFromMimeData( const QMimeData *source )
{
    if (source->hasImage())
    {
        QImage image = qvariant_cast<QImage>(source->imageData());
        QTextCursor cursor = this->textCursor();
        QTextDocument *document = this->document();
        document->addResource(QTextDocument::ImageResource, QUrl("image"), image);
        cursor.insertImage("image");
    }
}



#include <QtGui>
#include "textedit.h"
int main(int argc, char * argv[])
{
    QApplication app(argc, argv);
    TextEdit *textEdit = new TextEdit;
    textEdit->show();
    return app.exec();
}

C++/Qt/QTextEdit

extends QTextEdit

QTextEdit and QTextCursor

Using QTextEdit

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