/*
 * Copyright (C) 2014 Canonical, Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Daniel d'Andrada <daniel.dandrada@canonical.com>
 */

#include "windowinputfilter.h"

#include <QQuickWindow>

WindowInputFilter::WindowInputFilter(QQuickItem *parent)
    : QQuickItem(parent),
      m_lastInputTimestamp(0)
{
    connect(this, &QQuickItem::windowChanged,
            this, &WindowInputFilter::setupFilterOnWindow);
}

bool WindowInputFilter::eventFilter(QObject *watched, QEvent *event)
{
    Q_ASSERT(!m_filteredWindow.isNull());
    Q_ASSERT(watched == static_cast<QObject*>(m_filteredWindow.data()));
    Q_UNUSED(watched);

    QInputEvent *inputEvent = dynamic_cast<QInputEvent*>(event);
    if (inputEvent) {
        m_lastInputTimestamp = inputEvent->timestamp();
        Q_EMIT lastInputTimestampChanged();
    }

    if (event->type() == QEvent::KeyPress || event->type() == QEvent::KeyRelease) {
        // Let QML see this event and decide if it does not want it
        event->accept();
        QCoreApplication::sendEvent(this, event);
        return event->isAccepted();
    } else {
        // Not interested
        return false;
    }
}

void WindowInputFilter::setupFilterOnWindow(QQuickWindow *window)
{
    if (!m_filteredWindow.isNull()) {
        m_filteredWindow->removeEventFilter(this);
        m_filteredWindow.clear();
    }

    if (window) {
        window->installEventFilter(this);
        m_filteredWindow = window;
    }
}

ulong WindowInputFilter::lastInputTimestamp() const
{
    return m_lastInputTimestamp;
}