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/****************************************************************************
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the examples of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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****************************************************************************/
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#include <QtGui/qplaintextedit.h>
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#include <QtGui/qtextedit.h>
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#include <QtGui/qabstractkineticscroller.h>
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#include <QtGui/qscrollarea.h>
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#ifndef TEXTEDITAUTORESIZER_H
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#define TEXTEDITAUTORESIZER_H
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class TextEditAutoResizer : public QObject
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TextEditAutoResizer(QWidget *parent)
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: QObject(parent), plainTextEdit(qobject_cast<QPlainTextEdit *>(parent)),
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textEdit(qobject_cast<QTextEdit *>(parent)), edit(qobject_cast<QFrame *>(parent))
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// parent must either inherit QPlainTextEdit or QTextEdit!
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Q_ASSERT(plainTextEdit || textEdit);
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connect(parent, SIGNAL(textChanged()), this, SLOT(textEditChanged()));
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connect(parent, SIGNAL(cursorPositionChanged()), this, SLOT(textEditChanged()));
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inline void textEditChanged();
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QPlainTextEdit *plainTextEdit;
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void TextEditAutoResizer::textEditChanged()
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QTextDocument *doc = textEdit ? textEdit->document() : plainTextEdit->document();
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QRect cursor = textEdit ? textEdit->cursorRect() : plainTextEdit->cursorRect();
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QSize s = doc->size().toSize();
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s.setHeight((s.height() + 2) * edit->fontMetrics().lineSpacing());
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const QRect fr = edit->frameRect();
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const QRect cr = edit->contentsRect();
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edit->setMinimumHeight(qMax(70, s.height() + (fr.height() - cr.height() - 1)));
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// make sure the cursor is visible in case we have a QAbstractScrollArea parent
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QPoint pos = edit->pos();
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QWidget *pw = edit->parentWidget();
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if (qobject_cast<QScrollArea *>(pw))
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pw = pw->parentWidget();
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QScrollArea *area = static_cast<QScrollArea *>(pw);
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QPoint scrollto = area->widget()->mapFrom(edit, cursor.center());
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QPoint margin(10 + cursor.width(), 2 * cursor.height());
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if (QAbstractKineticScroller *scroller = area->property("kineticScroller").value<QAbstractKineticScroller *>()) {
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scroller->ensureVisible(scrollto, margin.x(), margin.y());
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area->ensureVisible(scrollto.x(), scrollto.y(), margin.x(), margin.y());