blob: 101d68dc5aadcb78c4a9e1b280a4c5b6582ef5d4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
|
/**************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
**************************************************************************/
#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
}
}
|
