QTfrontend/ui/widget/SmartLineEdit.cpp
author sheepluva
Fri, 21 Oct 2011 00:02:11 +0200
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permissions -rw-r--r--
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2006-2007 Igor Ulyanov <iulyanov@gmail.com>
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 * Copyright (c) 2007-2011 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include "SmartLineEdit.h"
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SmartLineEdit::SmartLineEdit(QWidget * parent, int maxHistorySize)
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: HistoryLineEdit(parent, maxHistorySize)
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{
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    m_whitespace = QRegExp("\\s");
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    m_cmds  = new QStringList();
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    m_nicks = new QStringList();
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    resetAutoCompletionStatus();
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    // reset autocompletion status when cursor is moved or content is changed
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    connect(this, SIGNAL(cursorPositionChanged(int, int)),
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            this, SLOT(resetAutoCompletionStatus()));
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    connect(this, SIGNAL(textChanged(const QString&)),
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            this, SLOT(resetAutoCompletionStatus()));
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}
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void SmartLineEdit::addCommands(const QStringList & commands)
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{
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    m_keywordMutex.lock();
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    m_cmds->append(commands);
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    m_keywordMutex.unlock();
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}
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void SmartLineEdit::removeCommands(const QStringList & commands)
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{
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    m_keywordMutex.lock();
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    foreach (const QString & cmd, commands)
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    {
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        m_cmds->removeAll(cmd);
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    }
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    m_keywordMutex.unlock();
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}
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void SmartLineEdit::addNickname(const QString & name)
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{
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    m_keywordMutex.lock();
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    m_nicks->append(name);
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    m_keywordMutex.unlock();
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}
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void SmartLineEdit::removeNickname(const QString & name)
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{
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    m_keywordMutex.lock();
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    m_nicks->removeAll(name);
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    m_keywordMutex.unlock();
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}
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void SmartLineEdit::reset()
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{
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    // forget keywords
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    m_keywordMutex.lock();
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    m_cmds->clear();
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    m_nicks->clear();
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    resetAutoCompletionStatus();
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    m_keywordMutex.unlock();
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    // forget history
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    HistoryLineEdit::reset();
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}
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bool SmartLineEdit::event(QEvent * event)
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{
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    // we only want special treatment for key press events
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    if (event->type() == QEvent::KeyPress)
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    {
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        QKeyEvent * keyEvent = static_cast<QKeyEvent*>(event);
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        // TAB key pressed and any useful chars in the matchMe -> let's process those
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        if ((keyEvent->key() == Qt::Key_Tab) && (!text().trimmed().isEmpty()))
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        {
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            keyPressEvent(keyEvent);
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            if (event->isAccepted())
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                return true;
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        }
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    }
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    return HistoryLineEdit::event(event);
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}
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void SmartLineEdit::keyPressEvent(QKeyEvent * event)
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{
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    int key = event->key(); // retrieve pressed key
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    // auto-complete on pressed TAB (except for whitespace-only contents)
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    if ((key == Qt::Key_Tab) && (!text().trimmed().isEmpty()))
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    {
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        autoComplete();
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        event->accept();
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    }
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    // clear contents on pressed ESC
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    else if ((event->modifiers() == Qt::NoModifier) && (key == Qt::Key_Escape))
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    {
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        clear();
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        event->accept();
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    }
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    // otherwise forward keys to parent
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    else
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        HistoryLineEdit::keyPressEvent(event);
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}
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void SmartLineEdit::autoComplete()
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{
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    QString match = "";
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    bool isNick = false;
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    QString matchMe = text();
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    QString prefix = "";
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    QString postfix = "";
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    bool isFirstWord;
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    // we are trying to rematch, so use the data from earlier
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    if (m_hasJustMatched)
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    {
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        // restore values from earlier auto-completion
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        matchMe = m_beforeMatch;
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        prefix = m_prefix;
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        postfix = m_postfix;
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        isFirstWord = prefix.isEmpty();
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    }
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    else
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    {
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        m_keywordMutex.lock();
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        m_cmds->sort();
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        m_nicks->sort();
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        m_keywordMutex.unlock();
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        int cp = cursorPosition();
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        // cursor is not in or at end/beginning of word
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        if ((cp = matchMe.length()) || (QString(matchMe.at(cp)).contains(m_whitespace)))
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            if ((cp < 1) || (QString(matchMe.at(cp-1)).contains(m_whitespace)))
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                return;
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        // crop matchMe at cursor position
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        prefix  = matchMe.left (cp);
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        postfix = matchMe.right(matchMe.length()-cp);
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        matchMe = "";
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        // use the whole word the curser is on for matching
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        int prefixLen = prefix.lastIndexOf(m_whitespace) + 1;
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        int preWordLen = prefix.length() - prefixLen;
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        int postWordLen = postfix.indexOf(m_whitespace);
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        int postfixLen = 0;
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        if (postWordLen < 0)
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            postWordLen = postfix.length();
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        else
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            postfixLen = postfix.length() - (postWordLen + 1);
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        matchMe = prefix.right(preWordLen) + postfix.left(postWordLen);
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        prefix  = prefix.left(prefixLen);
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        postfix = postfix.right(postfixLen);
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        isFirstWord = prefix.isEmpty(); // true if first word
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    }
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    m_keywordMutex.lock();
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    if (isFirstWord)
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    {
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        // find matching commands
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        foreach (const QString & cmd, *m_cmds)
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        {
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            if (cmd.startsWith(matchMe, Qt::CaseInsensitive))
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            {
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                match = cmd;
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                // move match to end so next time new matches will be prefered
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                if (m_cmds->removeAll(cmd) > 0);
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                    m_cmds->append(cmd);
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                break;
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            }
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        }
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    }
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    if (match.isEmpty())
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    {
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        // find matching nicks
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        foreach (const QString & nick, *m_nicks)
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        {
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            if (nick.startsWith(matchMe, Qt::CaseInsensitive))
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            {
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                match = nick;
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                isNick = true;
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                // move match to end so next time new matches will be prefered
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                if (m_nicks->removeAll(nick) > 0);
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                    m_nicks->append(nick);
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                break;
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            }
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        }
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    }
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    m_keywordMutex.unlock();
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    // we found a single match?
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    if (!match.isEmpty())
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    {
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        // replace last word with match
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        // and append ':' if a name at the beginning of the matchMe got completed
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        // also add a space at the very end to ease further typing
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        QString addAfter = ((isNick && isFirstWord)?": ":" ");
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        match = prefix + match + addAfter;
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        setText(match + postfix);
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        setCursorPosition(match.length());
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        // save values for for the case a rematch is requested
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        m_beforeMatch = matchMe;
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        m_hasJustMatched = true;
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        m_prefix = prefix;
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        m_postfix = postfix;
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    }
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}
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void SmartLineEdit::resetAutoCompletionStatus()
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{
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    m_beforeMatch = "";
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    m_hasJustMatched = false;
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    m_prefix = "";
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    m_postfix = "";
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}
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