/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qinputdevicemanager_p.h"
#include "qinputdevicemanager_p_p.h"

QT_BEGIN_NAMESPACE

/*!
  \class QInputDeviceManager
  \internal

  \brief QInputDeviceManager acts as a communication hub between QtGui and the input handlers.

  On embedded platforms the input handling code is either compiled into the platform
  plugin or is loaded dynamically as a generic plugin without any interface. The input
  handler in use may also change between each run (e.g. evdevmouse/keyboard/touch
  vs. libinput). QWindowSystemInterface is too limiting when Qt (the platform plugin) is
  acting as a windowing system, and is one way only.

  QInputDeviceManager solves this by providing a global object that is used to communicate
  from the input handlers to the rest of Qt (e.g. the number of connected mice, which may
  be important information for the cursor drawing code), and vice-versa (e.g. to indicate
  to the input handler that a manual cursor position change was requested by the
  application via QCursor::setPos and thus any internal state has to be updated accordingly).
*/

QInputDeviceManager::QInputDeviceManager(QObject *parent)
    : QObject(*new QInputDeviceManagerPrivate, parent)
{
    qRegisterMetaType<DeviceType>();
}

int QInputDeviceManager::deviceCount(DeviceType type) const
{
    Q_D(const QInputDeviceManager);
    return d->deviceCount(type);
}

int QInputDeviceManagerPrivate::deviceCount(QInputDeviceManager::DeviceType type) const
{
    return m_deviceCount[type];
}

void QInputDeviceManagerPrivate::setDeviceCount(QInputDeviceManager::DeviceType type, int count)
{
    Q_Q(QInputDeviceManager);
    if (m_deviceCount[type] != count) {
        m_deviceCount[type] = count;
        emit q->deviceListChanged(type);
    }
}

void QInputDeviceManager::setCursorPos(const QPoint &pos)
{
    emit cursorPositionChangeRequested(pos);
}

/*!
    \return the keyboard modifier state stored in the QInputDeviceManager object.

    Keyboard input handlers are expected to keep this up-to-date via
    setKeyboardModifiers().

    Querying the state via this function (e.g. from a mouse handler that needs
    to include the modifier state in mouse events) is the preferred alternative
    over QGuiApplication::keyboardModifiers() since the latter may not report
    the current state due to asynchronous QPA event processing.
 */
Qt::KeyboardModifiers QInputDeviceManager::keyboardModifiers() const
{
    Q_D(const QInputDeviceManager);
    return d->keyboardModifiers;
}

void QInputDeviceManager::setKeyboardModifiers(Qt::KeyboardModifiers mods)
{
    Q_D(QInputDeviceManager);
    d->keyboardModifiers = mods;
}

QT_END_NAMESPACE