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#include "qquicksystempalette_p.h"

#include <QGuiApplication>

#include <private/qobject_p.h>

QT_BEGIN_NAMESPACE

class QQuickSystemPalettePrivate : public QObjectPrivate
{
public:
    QPalette palette;
    QPalette::ColorGroup group;
};



/*!
    \qmlclass SystemPalette QQuickSystemPalette
    \inqmlmodule QtQuick 2
    \ingroup qml-utility-elements
    \brief The SystemPalette element provides access to the Qt palettes.

    The SystemPalette element provides access to the Qt application
    palettes. This provides information about the standard colors used 
    for application windows, buttons and other features. These colors
    are grouped into three \e {color groups}: \c Active, \c Inactive,
    and \c Disabled.  See the QPalette documentation for details about
    color groups and the properties provided by SystemPalette.

    This can be used to color items in a way that provides a more
    native look and feel.

    The following example creates a palette from the \c Active color
    group and uses this to color the window and text items
    appropriately:

    \snippet doc/src/snippets/qml/systempalette.qml 0

    \sa QPalette
*/
QQuickSystemPalette::QQuickSystemPalette(QObject *parent)
    : QObject(*(new QQuickSystemPalettePrivate), parent)
{
    Q_D(QQuickSystemPalette);
    d->palette = QGuiApplication::palette();
    d->group = QPalette::Active;
    qApp->installEventFilter(this);
}

QQuickSystemPalette::~QQuickSystemPalette()
{
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::window
    The window (general background) color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::window() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Window);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::windowText
    The window text (general foreground) color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::windowText() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::WindowText);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::base
    The base color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::base() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Base);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::text
    The text color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::text() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Text);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::alternateBase
    The alternate base color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::alternateBase() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::AlternateBase);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::button
    The button color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::button() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Button);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::buttonText
    The button text foreground color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::buttonText() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::ButtonText);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::light
    The light color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::light() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Light);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::midlight
    The midlight color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::midlight() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Midlight);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::dark
    The dark color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::dark() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Dark);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::mid
    The mid color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::mid() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Mid);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::shadow
    The shadow color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::shadow() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Shadow);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::highlight
    The highlight color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::highlight() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::Highlight);
}

/*!
    \qmlproperty color QtQuick2::SystemPalette::highlightedText
    The highlighted text color of the current color group.

    \sa QPalette::ColorRole
*/
QColor QQuickSystemPalette::highlightedText() const
{
    Q_D(const QQuickSystemPalette);
    return d->palette.color(d->group, QPalette::HighlightedText);
}

/*!
    \qmlproperty enumeration QtQuick2::SystemPalette::colorGroup

    The color group of the palette. This can be one of:

    \list
    \o SystemPalette.Active (default)
    \o SystemPalette.Inactive
    \o SystemPalette.Disabled
    \endlist

    \sa QPalette::ColorGroup
*/
QQuickSystemPalette::ColorGroup QQuickSystemPalette::colorGroup() const
{
    Q_D(const QQuickSystemPalette);
    return (QQuickSystemPalette::ColorGroup)d->group;
}

void QQuickSystemPalette::setColorGroup(QQuickSystemPalette::ColorGroup colorGroup)
{
    Q_D(QQuickSystemPalette);
    d->group = (QPalette::ColorGroup)colorGroup;
    emit paletteChanged();
}

bool QQuickSystemPalette::eventFilter(QObject *watched, QEvent *event)
{
    if (watched == qApp) {
        if (event->type() == QEvent::ApplicationPaletteChange) {
            QGuiApplication::postEvent(this, new QEvent(QEvent::ApplicationPaletteChange));
            return false;
        }
    }
    return QObject::eventFilter(watched, event);
}

bool QQuickSystemPalette::event(QEvent *event)
{
    Q_D(QQuickSystemPalette);
    if (event->type() == QEvent::ApplicationPaletteChange) {
        d->palette = QGuiApplication::palette();
        emit paletteChanged();
        return true;
    }
    return QObject::event(event);
}

QT_END_NAMESPACE