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#include "qeglcompositor_p.h"
#include "qeglplatformscreen_p.h"

QT_BEGIN_NAMESPACE

/*!
    \class QEGLPlatformScreen
    \brief Base class for EGL-based platform screen implementations.
    \since 5.2
    \internal
    \ingroup qpa

    This class provides a lightweight base for QPlatformScreen
    implementations. It covers basic window stack management which is
    necessary when compositing multiple raster (widget-based) windows
    together into one single native surface.

    Reimplementing the virtuals are essential when using
    QEGLPlatformBackingStore. The context and the window returned from
    these are the ones that are used when compositing the textures
    generated from the raster (widget) based windows.

    \note It is up to the QEGLPlatformWindow subclasses to use the
    functions, like addWindow(), removeWindow(), etc., provided here.
 */

QEGLPlatformScreen::QEGLPlatformScreen(EGLDisplay dpy)
    : m_dpy(dpy)
{
}

QEGLPlatformScreen::~QEGLPlatformScreen()
{
    QEGLCompositor::destroy();
}

void QEGLPlatformScreen::addWindow(QEGLPlatformWindow *window)
{
    if (!m_windows.contains(window)) {
        m_windows.append(window);
        topWindowChanged(window);
    }
}

void QEGLPlatformScreen::removeWindow(QEGLPlatformWindow *window)
{
    m_windows.removeOne(window);
    if (!m_windows.isEmpty())
        topWindowChanged(m_windows.last());
}

void QEGLPlatformScreen::moveToTop(QEGLPlatformWindow *window)
{
    m_windows.removeOne(window);
    m_windows.append(window);
    topWindowChanged(window);
}

void QEGLPlatformScreen::changeWindowIndex(QEGLPlatformWindow *window, int newIdx)
{
    int idx = m_windows.indexOf(window);
    if (idx != -1 && idx != newIdx) {
        m_windows.move(idx, newIdx);
        if (newIdx == m_windows.size() - 1)
            topWindowChanged(m_windows.last());
    }
}

QT_END_NAMESPACE