qt-creator/src/plugins/help/openpagesswitcher.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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 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: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#include "openpagesswitcher.h"

#include "centralwidget.h"
#include "openpagesmodel.h"
#include "openpageswidget.h"

#include <QtCore/QEvent>

#include <QtGui/QKeyEvent>

using namespace Help::Internal;

const int gWidth = 300;
const int gHeight = 200;

OpenPagesSwitcher::OpenPagesSwitcher(OpenPagesModel *model)
    : QWidget(0, Qt::Popup)
    , m_openPagesModel(model)
{
    resize(gWidth, gHeight);

    m_openPagesWidget = new OpenPagesWidget(m_openPagesModel, this);

    m_openPagesWidget->allowContextMenu(false);
    m_openPagesWidget->installEventFilter(this);
    m_openPagesWidget->setGeometry(0, 0, gWidth, gHeight);

    connect(m_openPagesWidget, SIGNAL(closePage(QModelIndex)), this,
        SIGNAL(closePage(QModelIndex)));
    connect(m_openPagesWidget, SIGNAL(setCurrentPage(QModelIndex)), this,
        SIGNAL(setCurrentPage(QModelIndex)));
}

OpenPagesSwitcher::~OpenPagesSwitcher()
{
}

void OpenPagesSwitcher::gotoNextPage()
{
    selectPageUpDown(-1);
}

void OpenPagesSwitcher::gotoPreviousPage()
{
    selectPageUpDown(1);
}

void OpenPagesSwitcher::selectAndHide()
{
    setVisible(false);
    emit setCurrentPage(m_openPagesWidget->currentIndex());
}

void OpenPagesSwitcher::selectCurrentPage()
{
    m_openPagesWidget->selectCurrentPage();
}

void OpenPagesSwitcher::setVisible(bool visible)
{
    QWidget::setVisible(visible);
    if (visible)
        setFocus();
}

void OpenPagesSwitcher::focusInEvent(QFocusEvent *event)
{
    Q_UNUSED(event)
    m_openPagesWidget->setFocus();
}

bool OpenPagesSwitcher::eventFilter(QObject *object, QEvent *event)
{
    if (object == m_openPagesWidget) {
        if (event->type() == QEvent::KeyPress) {
            QKeyEvent *ke = static_cast<QKeyEvent*>(event);
            if (ke->key() == Qt::Key_Escape) {
                setVisible(false);
                return true;
            }

            const int key = ke->key();
            if (key == Qt::Key_Return || key == Qt::Key_Enter || key == Qt::Key_Space) {
                emit setCurrentPage(m_openPagesWidget->currentIndex());
                return true;
            }
        } else if (event->type() == QEvent::KeyRelease) {
            QKeyEvent *ke = static_cast<QKeyEvent*>(event);
            if (ke->modifiers() == 0
               /*HACK this is to overcome some event inconsistencies between platforms*/
               || (ke->modifiers() == Qt::AltModifier
               && (ke->key() == Qt::Key_Alt || ke->key() == -1))) {
                selectAndHide();
            }
        }
    }
    return QWidget::eventFilter(object, event);
}

void OpenPagesSwitcher::selectPageUpDown(int summand)
{
    const int pageCount = m_openPagesModel->rowCount();
    if (pageCount < 2)
        return;

    const QModelIndexList &list = m_openPagesWidget->selectionModel()->selectedIndexes();
    if (list.isEmpty())
        return;

    QModelIndex index = list.first();
    if (!index.isValid())
        return;

    index = m_openPagesModel->index((index.row() + summand + pageCount) % pageCount, 0);
    if (index.isValid()) {
        m_openPagesWidget->setCurrentIndex(index);
        m_openPagesWidget->scrollTo(index, QAbstractItemView::PositionAtCenter);
    }
}