269 lines
7.3 KiB
C++
269 lines
7.3 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the plugins of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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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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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qcomposeplatforminputcontext.h"
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#include <QtCore/QCoreApplication>
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#include <QtGui/QKeyEvent>
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#include <QtCore/QDebug>
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QT_BEGIN_NAMESPACE
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//#define DEBUG_COMPOSING
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static const int ignoreKeys[] = {
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Qt::Key_Shift,
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Qt::Key_Control,
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Qt::Key_Meta,
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Qt::Key_Alt,
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Qt::Key_CapsLock,
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Qt::Key_Super_L,
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Qt::Key_Super_R,
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Qt::Key_Hyper_L,
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Qt::Key_Hyper_R,
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Qt::Key_Mode_switch
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};
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static const int composingKeys[] = {
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Qt::Key_Multi_key,
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Qt::Key_Dead_Grave,
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Qt::Key_Dead_Acute,
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Qt::Key_Dead_Circumflex,
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Qt::Key_Dead_Tilde,
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Qt::Key_Dead_Macron,
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Qt::Key_Dead_Breve,
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Qt::Key_Dead_Abovedot,
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Qt::Key_Dead_Diaeresis,
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Qt::Key_Dead_Abovering,
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Qt::Key_Dead_Doubleacute,
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Qt::Key_Dead_Caron,
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Qt::Key_Dead_Cedilla,
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Qt::Key_Dead_Ogonek,
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Qt::Key_Dead_Iota,
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Qt::Key_Dead_Voiced_Sound,
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Qt::Key_Dead_Semivoiced_Sound,
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Qt::Key_Dead_Belowdot,
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Qt::Key_Dead_Hook,
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Qt::Key_Dead_Horn
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};
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QComposeInputContext::QComposeInputContext()
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{
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TableGenerator reader;
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m_tableState = reader.tableState();
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if ((m_tableState & TableGenerator::NoErrors) == TableGenerator::NoErrors) {
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m_composeTable = reader.composeTable();
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clearComposeBuffer();
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}
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}
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bool QComposeInputContext::filterEvent(const QEvent *event)
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{
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// if there were errors when generating the compose table input
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// context should not try to filter anything, simply return false
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if ((m_tableState & TableGenerator::NoErrors) != TableGenerator::NoErrors)
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return false;
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QKeyEvent *keyEvent = (QKeyEvent *)event;
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// should pass only the key presses
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if (keyEvent->type() != QEvent::KeyPress) {
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return false;
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}
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int keyval = keyEvent->key();
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int keysym = 0;
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if (ignoreKey(keyval))
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return false;
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QString text = keyEvent->text();
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if (!composeKey(keyval) && text.isEmpty())
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return false;
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keysym = keyEvent->nativeVirtualKey();
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int nCompose = 0;
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while (m_composeBuffer[nCompose] != 0 && nCompose < QT_KEYSEQUENCE_MAX_LEN)
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nCompose++;
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if (nCompose == QT_KEYSEQUENCE_MAX_LEN) {
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reset();
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nCompose = 0;
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}
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m_composeBuffer[nCompose] = keysym;
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// check sequence
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if (checkComposeTable())
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return true;
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return false;
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}
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bool QComposeInputContext::isValid() const
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{
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return true;
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}
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void QComposeInputContext::setFocusObject(QObject *object)
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{
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m_focusObject = object;
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}
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void QComposeInputContext::reset()
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{
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clearComposeBuffer();
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}
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void QComposeInputContext::update(Qt::InputMethodQueries q)
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{
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QPlatformInputContext::update(q);
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}
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static bool isDuplicate(const QComposeTableElement &lhs, const QComposeTableElement &rhs)
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{
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for (size_t i = 0; i < QT_KEYSEQUENCE_MAX_LEN; i++) {
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if (lhs.keys[i] != rhs.keys[i])
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return false;
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}
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return true;
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}
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bool QComposeInputContext::checkComposeTable()
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{
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QList<QComposeTableElement>::iterator it =
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qLowerBound(m_composeTable.begin(), m_composeTable.end(), m_composeBuffer, Compare());
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// prevent dereferencing an 'end' iterator, which would result in a crash
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if (it == m_composeTable.end())
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it -= 1;
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QComposeTableElement elem = *it;
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// would be nicer if qLowerBound had API that tells if the item was actually found
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if (m_composeBuffer[0] != elem.keys[0]) {
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#ifdef DEBUG_COMPOSING
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qDebug( "### no match ###" );
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#endif
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reset();
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return false;
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}
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// check if compose buffer is matched
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for (int i=0; i < QT_KEYSEQUENCE_MAX_LEN; i++) {
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// check if partial match
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if (m_composeBuffer[i] == 0 && elem.keys[i]) {
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#ifdef DEBUG_COMPOSING
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qDebug("### partial match ###");
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#endif
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return true;
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}
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if (m_composeBuffer[i] != elem.keys[i]) {
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#ifdef DEBUG_COMPOSING
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qDebug("### different entry ###");
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#endif
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reset();
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return i != 0;
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}
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}
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#ifdef DEBUG_COMPOSING
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qDebug("### match exactly ###");
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#endif
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// check if the key sequence is overwriten - see the comment in
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// TableGenerator::orderComposeTable()
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int next = 1;
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do {
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// if we are at the end of the table, then we have nothing to do here
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if (it + next != m_composeTable.end()) {
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QComposeTableElement nextElem = *(it + next);
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if (isDuplicate(elem, nextElem)) {
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elem = nextElem;
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next++;
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continue;
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} else {
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break;
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}
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}
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break;
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} while (true);
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commitText(elem.value);
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reset();
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return true;
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}
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void QComposeInputContext::commitText(uint character) const
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{
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QInputMethodEvent event;
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event.setCommitString(QChar(character));
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QCoreApplication::sendEvent(m_focusObject, &event);
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}
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bool QComposeInputContext::ignoreKey(int keyval) const
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{
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for (uint i = 0; i < (sizeof(ignoreKeys) / sizeof(ignoreKeys[0])); i++)
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if (keyval == ignoreKeys[i])
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return true;
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return false;
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}
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bool QComposeInputContext::composeKey(int keyval) const
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{
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for (uint i = 0; i < (sizeof(composingKeys) / sizeof(composingKeys[0])); i++)
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if (keyval == composingKeys[i])
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return true;
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return false;
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}
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void QComposeInputContext::clearComposeBuffer()
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{
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for (uint i=0; i < (sizeof(m_composeBuffer) / sizeof(int)); i++)
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m_composeBuffer[i] = 0;
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}
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QComposeInputContext::~QComposeInputContext() {}
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QT_END_NAMESPACE
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