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#include "qplatformwindow_qpa.h"

#include <QtGui/qwindowsysteminterface_qpa.h>
#include <QtGui/qwidget.h>

class QPlatformWindowPrivate
{
    QWidget *tlw;
    QRect rect;
    Qt::WindowFlags flags;
    friend class QPlatformWindow;
};

/*!
    Constructs a platform window with the given top level widget.
*/

QPlatformWindow::QPlatformWindow(QWidget *tlw)
    : d_ptr(new QPlatformWindowPrivate)
{
    Q_D(QPlatformWindow);
    d->tlw = tlw;
    tlw->setPlatformWindow(this);
}

/*!
    Virtual destructor does not delete its top level widget.
*/
QPlatformWindow::~QPlatformWindow()
{
}

/*!
    Returnes the widget which belongs to the QPlatformWindow
*/
QWidget *QPlatformWindow::widget() const
{
    Q_D(const QPlatformWindow);
    return d->tlw;
}

/*!
    This function is called by Qt whenever a window is moved or the window is resized. The resize
    can happen programatically(from ie. user application) or by the window manager. This means that
    there is no need to call this function specifically from the window manager callback, instead
    call QWindowSystemInterface::handleGeometryChange(QWidget *w, const QRect &newRect);
*/
void QPlatformWindow::setGeometry(const QRect &rect)
{
    Q_D(QPlatformWindow);
    d->rect = rect;
}

/*!
    Returnes the current geometry of a window
*/
QRect QPlatformWindow::geometry() const
{
    Q_D(const QPlatformWindow);
    return d->rect;
}

/*!
    Reimplemented in subclasses to show the surface
    if \a visible is \c true, and hide it if \a visible is \c false.
*/
void QPlatformWindow::setVisible(bool visible)
{
    Q_UNUSED(visible);
}
/*!
    Requests setting the window flags of this surface
    to \a type. Returns the actual flags set.
*/
Qt::WindowFlags QPlatformWindow::setWindowFlags(Qt::WindowFlags flags)
{
    Q_D(QPlatformWindow);
    d->flags = flags;
    return flags;
}

/*!
  Returns the effective window flags for this surface.
*/
Qt::WindowFlags QPlatformWindow::windowFlags() const
{
    Q_D(const QPlatformWindow);
    return d->flags;
}

/*!
  Reimplement in subclasses to return a handle to the native window
*/
WId QPlatformWindow::winId() const { return WId(0); }

/*!
    This function is called to enable native child widgets in QPA. It is common not to support this
    feature in Window systems, but can be faked. When this function is called all geometry of this
    platform window will be relative to the parent.
*/
//jl: It would be useful to have a property on the platform window which indicated if the sub-class
// supported the setParent. If not, then geometry would be in screen coordinates.
void QPlatformWindow::setParent(const QPlatformWindow *parent)
{
    Q_UNUSED(parent);
    qWarning("This plugin does not support setParent!");
}

/*!
  Reimplement to set the window title to \a title
*/
void QPlatformWindow::setWindowTitle(const QString &) {}

/*!
  Reimplement to be able to let Qt rais windows to the top of the desktop
*/
void QPlatformWindow::raise() { qWarning("This plugin does not support raise()"); }

/*!
  Reimplement to be able to let Qt lower windows to the bottom of the desktop
*/
void QPlatformWindow::lower() { qWarning("This plugin does not support lower()"); }

/*!
  Reimplement to be able to let Qt set the opacity level of a window
*/
void QPlatformWindow::setOpacity(qreal level)
{
    Q_UNUSED(level);
    qWarning("This plugin does not support setting window opacity");
}

/*!
  Reimplement to let Qt be able to request activation/focus for a window

  Some window systems will probably not have callbacks for this functionality,
  and then calling QWindowSystemInterface::handleWindowActivated(QWidget *w)
  would be sufficient.

  If the window system has some event handling/callbacks then call
  QWindowSystemInterface::handleWindowActivated(QWidget *w) when the window system
  gives the notification.

  Default implementation calls QWindowSystem::handleWindowActivated(QWidget *w)
*/
void QPlatformWindow::requestActivateWindow()
{
    QWindowSystemInterface::handleWindowActivated(widget());
}

/*!
  Reimplement to return the glContext associated with the window.
*/
QPlatformGLContext *QPlatformWindow::glContext() const
{
    return 0;
}

/*!
    \class QPlatformWindow
    \since 4.8
    \internal
    \preliminary
    \ingroup qpa

    \brief The QPlatformWindow class provides an abstraction for top-level windows.

    The QPlatformWindow abstraction is used by QWidget for all its top level widgets. It is being
    created by calling the createPlatformWindow function in the loaded QPlatformIntegration
    instance.

    QPlatformWindow is used to signal to the windowing system, how Qt persieves its frame.
    However, it is not concerned with how Qt renders into the window it represents.

    Top level QWidgets(tlw) will always have a QPlatformWindow. However, it is not necessary for
    all tlw to have a QWindowSurface. This is the case for QGLWidget. And could be the case for
    widgets where some  3.party renders into it.

    The platform specific window handle can be retrieved by the winId function.

    QPlatformWindow is also the way QPA defines how native child windows should be supported
    through the setParent function.

    The only way to retrieve a QPlatformGLContext in QPA is by calling the glContext() function
    on QPlatformWindow.

    \sa QWindowSurface, QWidget
*/