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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef __MOZ_CONTAINER_H__
#define __MOZ_CONTAINER_H__

#include <gtk/gtk.h>

/*
 * MozContainer
 *
 * This class serves three purposes in the nsIWidget implementation.
 *
 *   - It provides objects to receive signals from GTK for events on native
 *     windows.
 *
 *   - It provides GdkWindow to draw content on Wayland or when Gtk+ renders
 *     client side decorations to mShell.
 *
 *   - It provides a container parent for GtkWidgets.  The only GtkWidgets
 *     that need this in Mozilla are the GtkSockets for windowed plugins (Xt
 *     and XEmbed).
 *
 * Note that the window hierarchy in Mozilla differs from conventional
 * GtkWidget hierarchies.
 *
 * Mozilla's hierarchy exists through the GdkWindow hierarchy, and all child
 * GdkWindows (within a child nsIWidget hierarchy) belong to one MozContainer
 * GtkWidget.  If the MozContainer is unrealized or its GdkWindows are
 * destroyed for some other reason, then the hierarchy no longer exists.  (In
 * conventional GTK clients, the hierarchy is recorded by the GtkWidgets, and
 * so can be re-established after destruction of the GdkWindows.)
 *
 * One consequence of this is that the MozContainer does not know which of its
 * GdkWindows should parent child GtkWidgets.  (Conventional GtkContainers
 * determine which GdkWindow to assign child GtkWidgets.)
 *
 * Therefore, when adding a child GtkWidget to a MozContainer,
 * gtk_widget_set_parent_window should be called on the child GtkWidget before
 * it is realized.
 */

#define MOZ_CONTAINER_TYPE            (moz_container_get_type())
#define MOZ_CONTAINER(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), MOZ_CONTAINER_TYPE, MozContainer))
#define MOZ_CONTAINER_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), MOZ_CONTAINER_TYPE, MozContainerClass))
#define IS_MOZ_CONTAINER(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), MOZ_CONTAINER_TYPE))
#define IS_MOZ_CONTAINER_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), MOZ_CONTAINER_TYPE))
#define MOZ_CONTAINER_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), MOZ_CONTAINER_TYPE, MozContainerClass))

typedef struct _MozContainer      MozContainer;
typedef struct _MozContainerClass MozContainerClass;

/* Workaround for bug at wayland-util.h,
 * present in wayland-devel < 1.12
 */
#ifdef MOZ_WAYLAND
struct wl_subcompositor;
struct wl_surface;
struct wl_subsurface;
#endif

struct _MozContainer
{
    GtkContainer   container;
    GList         *children;

#ifdef MOZ_WAYLAND
    struct wl_subcompositor *subcompositor;
    struct wl_surface       *surface;
    struct wl_subsurface    *subsurface;
    struct wl_egl_window    *eglwindow;
    gboolean                 parent_surface_committed;
    gulong                   parent_surface_committed_handler;
#endif
};

struct _MozContainerClass
{
    GtkContainerClass parent_class;
};

GType      moz_container_get_type (void);
GtkWidget *moz_container_new      (void);
void       moz_container_put      (MozContainer *container,
                                   GtkWidget    *child_widget,
                                   gint          x,
                                   gint          y);
void       moz_container_move          (MozContainer *container,
                                        GtkWidget    *child_widget,
                                        gint          x,
                                        gint          y,
                                        gint          width,
                                        gint          height);

#ifdef MOZ_WAYLAND
struct wl_surface* moz_container_get_wl_surface(MozContainer *container);
struct wl_egl_window* moz_container_get_wl_egl_window(MozContainer *container);
gboolean moz_container_has_wl_egl_window(MozContainer *container);
#endif

#endif /* __MOZ_CONTAINER_H__ */