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** Copyright (C) 2015 The Qt Company Ltd.
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** This file is part of the examples of the Qt Wayland module
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#include "customextension.h"
#include <QtWaylandClient/private/qwaylanddisplay_p.h>
#include <QtWaylandClient/private/qwaylandintegration_p.h>
#include <QtGui/QGuiApplication>
#include <QtGui/QWindow>
#include <QtGui/QPlatformSurfaceEvent>
#include <QtGui/qpa/qplatformnativeinterface.h>
#include <QDebug>

QT_BEGIN_NAMESPACE

CustomExtension::CustomExtension()
    : QWaylandClientExtensionTemplate(/* Supported protocol version */ 1 )
    , m_activated(false)
{
    connect(this, &CustomExtension::activeChanged, this, &CustomExtension::handleExtensionActive);
}


static inline struct ::wl_surface *getWlSurface(QWindow *window)
{
    void *surf = QGuiApplication::platformNativeInterface()->nativeResourceForWindow("surface", window);
    return static_cast<struct ::wl_surface *>(surf);
}

QWindow *CustomExtension::windowForSurface(struct ::wl_surface *surface)
{
    for (QWindow *w : qAsConst(m_windows)) {
        if (getWlSurface(w) == surface)
            return w;
    }
    return nullptr;
}

bool CustomExtension::eventFilter(QObject *object, QEvent *event)
{
    if (event->type() == QEvent::PlatformSurface
            && static_cast<QPlatformSurfaceEvent*>(event)->surfaceEventType() == QPlatformSurfaceEvent::SurfaceCreated) {
        QWindow *window = qobject_cast<QWindow*>(object);
        Q_ASSERT(window);
        window->removeEventFilter(this);
        QtWayland::qt_example_extension::register_surface(getWlSurface(window));
    }
    return false;
}

void CustomExtension::sendWindowRegistration(QWindow *window)
{
    if (window->handle())
        QtWayland::qt_example_extension::register_surface(getWlSurface(window));
    else
        window->installEventFilter(this); // register when created
}

void CustomExtension::registerWindow(QWindow *window)
{
    m_windows << window;
    if (isActive())
        sendWindowRegistration(window);
}

void CustomExtension::sendBounce(QWindow *window, uint ms)
{
    QtWayland::qt_example_extension::bounce(getWlSurface(window), ms);
}

void CustomExtension::sendSpin(QWindow *window, uint ms)
{
    QtWayland::qt_example_extension::spin(getWlSurface(window), ms);
}

void CustomExtension::handleExtensionActive()
{
    if (isActive() && !m_activated) {
        for (QWindow *w : qAsConst(m_windows))
             sendWindowRegistration(w);
    }
}

void CustomExtension::example_extension_close(wl_surface *surface)
{
    QWindow *w = windowForSurface(surface);
    if (w)
        w->close();
}

void CustomExtension::example_extension_set_font_size(wl_surface *surface, uint32_t pixel_size)
{
    emit fontSize(windowForSurface(surface), pixel_size);
}

void CustomExtension::example_extension_set_window_decoration(uint32_t state)
{
    bool shown = state;
    for (QWindow *w : qAsConst(m_windows)) {
        Qt::WindowFlags f = w->flags();
        if (shown)
            f &= ~Qt::FramelessWindowHint;
        else
            f |= Qt::FramelessWindowHint;
        w->setFlags(f);
    }
}

QT_END_NAMESPACE