qt-creator/src/plugins/texteditor/circularclipboard.cpp

/**************************************************************************
**
** This file is part of Qt Creator
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** Copyright (c) 2012 Nokia Corporation and/or its subsidiary(-ies).
**
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**
**
** GNU Lesser General Public License Usage
**
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this file.
** Please review the following information to ensure the GNU Lesser General
** Public License version 2.1 requirements will be met:
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** rights. These rights are described in the Nokia Qt LGPL Exception
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#include "circularclipboard.h"

using namespace TextEditor::Internal;

static const int kMaxSize = 10;

CircularClipboard::CircularClipboard()
    : m_current(-1)
{}

CircularClipboard::~CircularClipboard()
{
}

CircularClipboard *CircularClipboard::instance()
{
    static CircularClipboard clipboard;
    return &clipboard;
}

void CircularClipboard::collect(const QMimeData *mimeData)
{
    collect(QSharedPointer<const QMimeData>(mimeData));
}

void CircularClipboard::collect(const QSharedPointer<const QMimeData> &mimeData)
{
    //Avoid duplicates
    const QString text = mimeData->text();
    for (QList< QSharedPointer<const QMimeData> >::iterator i = m_items.begin(); i != m_items.end(); ++i) {
        if (mimeData == *i || text == (*i)->text()) {
            m_items.erase(i);
            break;
        }
    }
    if (m_items.size() >= kMaxSize)
        m_items.removeLast();
    m_items.prepend(mimeData);
}

QSharedPointer<const QMimeData> CircularClipboard::next() const
{
    if (m_items.isEmpty())
        return QSharedPointer<const QMimeData>();

    if (m_current == m_items.length() - 1)
        m_current = 0;
    else
        ++m_current;

    return m_items.at(m_current);
}

void CircularClipboard::toLastCollect()
{
    m_current = -1;
}

int CircularClipboard::size() const
{
    return m_items.size();
}