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/**************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#include "lazyplaintextedit.h"
#include <QScrollBar>
const int INTERVAL = 20;
LazyPlainTextEdit::LazyPlainTextEdit(QWidget *parent)
: QPlainTextEdit(parent)
, m_timerId(0)
{
}
void LazyPlainTextEdit::timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_timerId) {
killTimer(m_timerId);
m_timerId = 0;
m_cachedOutput.chop(1); //removes the last \n
if (!m_cachedOutput.isEmpty()) {
appendPlainText(m_cachedOutput);
updateCursor(TextCursorPosition::Keep);
horizontalScrollBar()->setValue(0);
m_cachedOutput.clear();
}
}
}
void LazyPlainTextEdit::append(const QString &text)
{
m_cachedOutput.append(text + QLatin1String("\n"));
if (isVisible() && m_timerId == 0)
m_timerId = startTimer(INTERVAL);
}
void LazyPlainTextEdit::clear()
{
if (m_timerId) {
killTimer(m_timerId);
m_timerId = 0;
m_cachedOutput.clear();
}
QPlainTextEdit::clear();
}
void LazyPlainTextEdit::setVisible(bool visible)
{
if (m_timerId) {
killTimer(m_timerId);
m_timerId = 0;
}
if (visible)
m_timerId = startTimer(INTERVAL);
QPlainTextEdit::setVisible(visible);
updateCursor(TextCursorPosition::Keep);
}
void LazyPlainTextEdit::updateCursor(TextCursorPosition position)
{
QTextCursor cursor = textCursor();
if ((position == TextCursorPosition::ForceEnd) || cursor.atEnd()) {
// Workaround for height calculation issue if scrollbar is set to Qt::ScrollBarAsNeeded.
Qt::ScrollBarPolicy policy = horizontalScrollBarPolicy();
setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn); // enforce always on
cursor.movePosition(QTextCursor::End);
setTextCursor(cursor);
ensureCursorVisible();
setHorizontalScrollBarPolicy(policy); // but reset once we updated the cursor position
}
}
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