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#include "qplatformscreen_qpa.h"
#include <QtGui/qapplication.h>
#include <QtGui/private/qapplication_p.h>
#include <QtGui/qdesktopwidget.h>
#include <QtGui/qplatformintegration_qpa.h>
#include <QtGui/qwidget.h>
#include <QtGui/private/qwidget_p.h>

/*!
    Return the given top level widget for a given position.

    Default implementation retrieves a list of all top level widgets and finds the first widget
    which contains point \a pos
*/
QWidget *QPlatformScreen::topLevelAt(const QPoint & pos) const
{
    QWidgetList list = QApplication::topLevelWidgets();
    for (int i = list.size()-1; i >= 0; --i) {
        QWidget *w = list[i];
        //### mask is ignored
        if (w != QApplication::desktop() && w->isVisible() && w->geometry().contains(pos))
            return w;
    }

    return 0;
}

/*! \fn physicalSize() const
    Reimplement in subclass to return the physical size of the screen. This function is used by
    QFont to convert point sizes to pixel sizes.

    Default implementation takes the pixel size of the screen, considers a dpi of 100 and returns
    the calculated (and probably wrong) physical size
*/
QSize QPlatformScreen::physicalSize() const
{
    static const int dpi = 100;
    int width = geometry().width() / dpi * qreal(25.4) ;
    int height = geometry().height() / dpi * qreal(25.4) ;
    return QSize(width,height);
}

Q_GUI_EXPORT extern QWidgetPrivate *qt_widget_private(QWidget *widget);
QPlatformScreen * QPlatformScreen::platformScreenForWidget(const QWidget *widget)
{
    QWidget *window = widget->window();
    QWidgetPrivate *windowPrivate = qt_widget_private(window);
    QTLWExtra * topData = windowPrivate->topData();
    QPlatformIntegration *integration =
            QApplicationPrivate::platformIntegration();
    return integration->screens()[topData->screenIndex];
}

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

    \brief The QPlatformScreen class provides an abstraction for visual displays.

    Many window systems has support for retrieving information on the attached displays. To be able
    to query the display QPA uses QPlatformScreen. Qt its self is most dependent on the
    physicalSize() function, since this is the function it uses to calculate the dpi to use when
    converting point sizes to pixels sizes. However, this is unfortunate on some systems, as the
    native system fakes its dpi size.

    QPlatformScreen is also used by the public api QDesktopWidget for information about the desktop.
 */

/*! \fn geometry() const
    Reimplement in subclass to return the pixel geometry of the screen
*/

/*! \fn availableGeometry() const
    Reimplement in subclass to return the pixel geometry of the available space
    This normally is the desktop screen minus the task manager, global menubar etc.
*/

/*! \fn depth() const
    Reimplement in subclass to return current depth of the screen
*/

/*! \fn format() const
    Reimplement in subclass to return the image format which corresponds to the screen format
*/