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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** 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 Digia. For licensing terms and
** conditions see http://www.qt.io/licensing. 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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/
#include "completingtextedit.h"
#include <QAbstractItemView>
#include <QCompleter>
#include <QKeyEvent>
#include <QScrollBar>
static bool isEndOfWordChar(const QChar &c)
{
return !c.isLetterOrNumber() && c.category() != QChar::Punctuation_Connector;
}
/*! \class Utils::CompletingTextEdit
\brief The CompletingTextEdit class is a QTextEdit with auto-completion
support.
Excerpted from Qt examples/tools/customcompleter.
*/
namespace Utils {
class CompletingTextEditPrivate
{
public:
CompletingTextEditPrivate(CompletingTextEdit *textEdit);
void insertCompletion(const QString &completion);
QString textUnderCursor() const;
bool acceptsCompletionPrefix(const QString &prefix) const;
QCompleter *m_completer;
int m_completionLengthThreshold;
private:
CompletingTextEdit *m_backPointer;
};
CompletingTextEditPrivate::CompletingTextEditPrivate(CompletingTextEdit *textEdit)
: m_completer(0),
m_completionLengthThreshold(3),
m_backPointer(textEdit)
{
}
void CompletingTextEditPrivate::insertCompletion(const QString &completion)
{
if (m_completer->widget() != m_backPointer)
return;
QTextCursor tc = m_backPointer->textCursor();
int extra = completion.length() - m_completer->completionPrefix().length();
tc.movePosition(QTextCursor::Left);
tc.movePosition(QTextCursor::EndOfWord);
tc.insertText(completion.right(extra));
m_backPointer->setTextCursor(tc);
}
QString CompletingTextEditPrivate::textUnderCursor() const
{
QTextCursor tc = m_backPointer->textCursor();
tc.select(QTextCursor::WordUnderCursor);
return tc.selectedText();
}
bool CompletingTextEditPrivate::acceptsCompletionPrefix(const QString &prefix) const
{
return prefix.length() >= m_completionLengthThreshold;
}
CompletingTextEdit::CompletingTextEdit(QWidget *parent)
: QTextEdit(parent),
d(new CompletingTextEditPrivate(this))
{
}
CompletingTextEdit::~CompletingTextEdit()
{
delete d;
}
void CompletingTextEdit::setCompleter(QCompleter *c)
{
if (completer())
disconnect(completer(), 0, this, 0);
d->m_completer = c;
if (!c)
return;
completer()->setWidget(this);
completer()->setCompletionMode(QCompleter::PopupCompletion);
connect(completer(), SIGNAL(activated(QString)), this, SLOT(insertCompletion(QString)));
}
QCompleter *CompletingTextEdit::completer() const
{
return d->m_completer;
}
int CompletingTextEdit::completionLengthThreshold() const
{
return d->m_completionLengthThreshold;
}
void CompletingTextEdit::setCompletionLengthThreshold(int len)
{
d->m_completionLengthThreshold = len;
}
void CompletingTextEdit::keyPressEvent(QKeyEvent *e)
{
if (completer() && completer()->popup()->isVisible()) {
// The following keys are forwarded by the completer to the widget
switch (e->key()) {
case Qt::Key_Enter:
case Qt::Key_Return:
case Qt::Key_Escape:
case Qt::Key_Tab:
case Qt::Key_Backtab:
e->ignore();
return; // let the completer do default behavior
default:
break;
}
}
const bool isShortcut = ((e->modifiers() & Qt::ControlModifier) && e->key() == Qt::Key_E); // CTRL+E
if (completer() == 0 || !isShortcut) // do not process the shortcut when we have a completer
QTextEdit::keyPressEvent(e);
const bool ctrlOrShift = e->modifiers() & (Qt::ControlModifier | Qt::ShiftModifier);
const QString text = e->text();
if (completer() == 0 || (ctrlOrShift && text.isEmpty()))
return;
const bool hasModifier = (e->modifiers() != Qt::NoModifier) && !ctrlOrShift;
const QString newCompletionPrefix = d->textUnderCursor();
const QChar lastChar = text.isEmpty() ? QChar() : text.right(1).at(0);
if (!isShortcut && (hasModifier || text.isEmpty() || isEndOfWordChar(lastChar)
|| !d->acceptsCompletionPrefix(newCompletionPrefix))) {
completer()->popup()->hide();
return;
}
if (newCompletionPrefix != completer()->completionPrefix()) {
completer()->setCompletionPrefix(newCompletionPrefix);
completer()->popup()->setCurrentIndex(completer()->completionModel()->index(0, 0));
}
QRect cr = cursorRect();
cr.setWidth(completer()->popup()->sizeHintForColumn(0)
+ completer()->popup()->verticalScrollBar()->sizeHint().width());
completer()->complete(cr); // popup it up!
}
void CompletingTextEdit::focusInEvent(QFocusEvent *e)
{
if (completer() != 0)
completer()->setWidget(this);
QTextEdit::focusInEvent(e);
}
bool CompletingTextEdit::event(QEvent *e)
{
// workaround for QTCREATORBUG-9453
if (e->type() == QEvent::ShortcutOverride && completer()
&& completer()->popup() && completer()->popup()->isVisible()) {
QKeyEvent *ke = static_cast<QKeyEvent *>(e);
if (ke->key() == Qt::Key_Escape && !ke->modifiers()) {
ke->accept();
return true;
}
}
return QTextEdit::event(e);
}
} // namespace Utils
#include "moc_completingtextedit.cpp"
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