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+/****************************************************************************
+**
+** Copyright (C) 2011 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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/qplaintextedit.h>
+#include <QtGui/qtextedit.h>
+#include <QtGui/qscroller.h>
+#include <QtGui/qscrollarea.h>
+#include <QtDebug>
+
+#ifndef TEXTEDITAUTORESIZER_H
+#define TEXTEDITAUTORESIZER_H
+
+class TextEditAutoResizer : public QObject
+{
+ Q_OBJECT
+public:
+ TextEditAutoResizer(QWidget *parent)
+ : QObject(parent), plainTextEdit(qobject_cast<QPlainTextEdit *>(parent)),
+ textEdit(qobject_cast<QTextEdit *>(parent)), edit(qobject_cast<QFrame *>(parent))
+ {
+ // parent must either inherit QPlainTextEdit or QTextEdit!
+ Q_ASSERT(plainTextEdit || textEdit);
+
+ connect(parent, SIGNAL(textChanged()), this, SLOT(textEditChanged()));
+ connect(parent, SIGNAL(cursorPositionChanged()), this, SLOT(textEditChanged()));
+
+ textEditChanged();
+ }
+
+private Q_SLOTS:
+ inline void textEditChanged();
+
+private:
+ QPlainTextEdit *plainTextEdit;
+ QTextEdit *textEdit;
+ QFrame *edit;
+};
+
+void TextEditAutoResizer::textEditChanged()
+{
+ QTextDocument *doc = textEdit ? textEdit->document() : plainTextEdit->document();
+ QRect cursor = textEdit ? textEdit->cursorRect() : plainTextEdit->cursorRect();
+
+ QSize s = doc->size().toSize();
+ if (plainTextEdit)
+ s.setHeight((s.height() + 2) * edit->fontMetrics().lineSpacing());
+
+ const QRect fr = edit->frameRect();
+ const QRect cr = edit->contentsRect();
+
+ edit->setMinimumHeight(qMax(70, s.height() + (fr.height() - cr.height() - 1)));
+
+ // make sure the cursor is visible in case we have a QAbstractScrollArea parent
+ QPoint pos = edit->pos();
+ QWidget *pw = edit->parentWidget();
+ while (pw) {
+ if (qobject_cast<QScrollArea *>(pw))
+ break;
+ pw = pw->parentWidget();
+ }
+
+ if (pw) {
+ QScrollArea *area = static_cast<QScrollArea *>(pw);
+ QPoint scrollto = area->widget()->mapFrom(edit, cursor.center());
+ QPoint margin(10 + cursor.width(), 2 * cursor.height());
+
+#ifdef Q_WS_MAEMO_5
+ QScroller::scroller(area)->ensureVisible(scrollto, margin.x(), margin.y());
+#else
+ area->ensureVisible(scrollto.x(), scrollto.y(), margin.x(), margin.y());
+#endif
+ }
+}
+
+#endif