--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/doc/src/snippets/textdocument-selections/mainwindow.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,204 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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();
+
+//! [0]
+    cursor.beginEditBlock();
+//! [1]
+    cursor.movePosition(QTextCursor::StartOfWord);
+    cursor.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
+//! [1]
+    cursor.endEditBlock();
+//! [0]
+
+    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());
+}