[gnome-shell] shew: Add small library for dealing with external windows
- From: Florian Müllner <fmuellner src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gnome-shell] shew: Add small library for dealing with external windows
- Date: Thu, 26 Mar 2020 17:45:49 +0000 (UTC)
commit 6baf490aabfbac11aba455e2af4c501ad2d02584
Author: Florian Müllner <fmuellner gnome org>
Date: Thu Mar 5 04:52:09 2020 +0100
shew: Add small library for dealing with external windows
In order to support OpenExtensionPrefs()'s parentWindow parameter,
we will need the ability to make a window transient to an external
window identified by a string handle.
This takes the corresponding code from xdg-desktop-portal-gtk and
brings it into an introspectable form, likewise the counterpart in
libportal to export a string handle for a GtkWindow.
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1087
meson.build | 10 +
subprojects/shew/COPYING | 502 +++++++++++++++++++++
subprojects/shew/README.md | 24 +
subprojects/shew/meson.build | 27 ++
subprojects/shew/meson_options.txt | 4 +
subprojects/shew/src/meson.build | 29 ++
.../shew/src/shew-external-window-wayland.c | 117 +++++
.../shew/src/shew-external-window-wayland.h | 30 ++
subprojects/shew/src/shew-external-window-x11.c | 133 ++++++
subprojects/shew/src/shew-external-window-x11.h | 30 ++
subprojects/shew/src/shew-external-window.c | 161 +++++++
subprojects/shew/src/shew-external-window.h | 43 ++
subprojects/shew/src/shew-window-exporter.c | 216 +++++++++
subprojects/shew/src/shew-window-exporter.h | 38 ++
14 files changed, 1364 insertions(+)
---
diff --git a/meson.build b/meson.build
index 0532f7332e..7dc73a22dc 100644
--- a/meson.build
+++ b/meson.build
@@ -243,6 +243,16 @@ libgvc = subproject('gvc',
)
libgvc_gir = libgvc.get_variable('libgvc_gir')
+libshew = subproject('shew',
+ default_options: [
+ 'package_name=@0@'.format(meson.project_name()),
+ ]
+)
+
+libshew_version = libshew.get_variable('package_version')
+assert(libshew_version == meson.project_version(),
+ 'shew version does not match project version')
+
if get_option('extensions_tool')
extension_tool = subproject('extensions-tool',
default_options: [
diff --git a/subprojects/shew/COPYING b/subprojects/shew/COPYING
new file mode 100644
index 0000000000..4362b49151
--- /dev/null
+++ b/subprojects/shew/COPYING
@@ -0,0 +1,502 @@
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diff --git a/subprojects/shew/README.md b/subprojects/shew/README.md
new file mode 100644
index 0000000000..de15991c51
--- /dev/null
+++ b/subprojects/shew/README.md
@@ -0,0 +1,24 @@
+# Shell External Windows
+
+Shew is a small support library for dealing with external windows.
+
+The code for creating external windows from a handle that are suitable for
+setting a transient parent was copied from [xdg-desktop-portal-gtk].
+
+The code for exporting a handle for a GtkWindow is losely based on code
+from GTK/[libportal].
+
+## Stability
+This is an unstable library with no API or ABI guarantees, and no
+soname versioning.
+
+It is not recommended to use it outside the gnome-shell project, and
+may only be used as a subproject.
+
+## License
+shew is distributed under the terms of the GNU Lesser General Public License
+version 2.1 or later. See the [COPYING][license] file for details.
+
+[xdg-desktop-portal-gtk]: https://github.com/flatpak/xdg-desktop-portal-gtk
+[libportal]: https://github.com/flatpak/libportal
+[license]: COPYING
diff --git a/subprojects/shew/meson.build b/subprojects/shew/meson.build
new file mode 100644
index 0000000000..4007c9a5c0
--- /dev/null
+++ b/subprojects/shew/meson.build
@@ -0,0 +1,27 @@
+project('shew', 'c',
+ version: '3.36.0',
+ meson_version: '>= 0.47.0',
+ license: 'LGPLv2+',
+)
+
+assert(meson.is_subproject(), 'This project is only intended to be used as a subproject!')
+
+gnome = import('gnome')
+pkg = import('pkgconfig')
+
+api_version = '0'
+full_name = '@0@-@1@'.format(meson.project_name(), api_version)
+
+package_version = meson.project_version()
+package_name = get_option('package_name')
+assert(package_name != '', 'package_name must be specified')
+
+pkgdatadir = join_paths(get_option('datadir'), package_name)
+pkglibdir = join_paths(get_option('libdir'), package_name)
+
+girdir = join_paths(pkgdatadir, 'gir-1.0')
+typelibdir = join_paths(pkglibdir, 'girepository-1.0')
+
+gtk_dep = dependency('gtk+-3.0')
+
+subdir('src')
diff --git a/subprojects/shew/meson_options.txt b/subprojects/shew/meson_options.txt
new file mode 100644
index 0000000000..b5c0f5cf3f
--- /dev/null
+++ b/subprojects/shew/meson_options.txt
@@ -0,0 +1,4 @@
+option('package_name',
+ type: 'string',
+ description: 'Parent package the library is built into'
+)
diff --git a/subprojects/shew/src/meson.build b/subprojects/shew/src/meson.build
new file mode 100644
index 0000000000..c3b1a6b796
--- /dev/null
+++ b/subprojects/shew/src/meson.build
@@ -0,0 +1,29 @@
+shew_public_headers = files(
+ 'shew-external-window.h',
+ 'shew-window-exporter.h',
+)
+
+shew_sources = [
+ 'shew-external-window-wayland.c',
+ 'shew-external-window-x11.c',
+ 'shew-external-window.c',
+ 'shew-window-exporter.c',
+]
+
+libshew = library(full_name,
+ sources: shew_sources,
+ dependencies: [gtk_dep],
+ install_dir: pkglibdir,
+ install: true,
+)
+
+libshew_gir = gnome.generate_gir(libshew,
+ sources: shew_sources + shew_public_headers,
+ nsversion: api_version,
+ namespace: 'Shew',
+ includes: ['Gdk-3.0', 'Gtk-3.0'],
+ extra_args: ['--quiet'],
+ install_dir_gir: girdir,
+ install_dir_typelib: typelibdir,
+ install: true,
+)
diff --git a/subprojects/shew/src/shew-external-window-wayland.c
b/subprojects/shew/src/shew-external-window-wayland.c
new file mode 100644
index 0000000000..82989761f7
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window-wayland.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#include <gdk/gdk.h>
+
+#ifdef GDK_WINDOWING_WAYLAND
+#include <gdk/gdkwayland.h>
+#endif
+
+#include "shew-external-window-wayland.h"
+
+static GdkDisplay *wayland_display;
+
+struct _ShewExternalWindowWayland
+{
+ ShewExternalWindow parent;
+
+ char *handle_str;
+};
+
+G_DEFINE_TYPE (ShewExternalWindowWayland, shew_external_window_wayland,
+ SHEW_TYPE_EXTERNAL_WINDOW)
+
+static GdkDisplay *
+get_wayland_display (void)
+{
+ if (wayland_display)
+ return wayland_display;
+
+ gdk_set_allowed_backends ("wayland");
+ wayland_display = gdk_display_open (NULL);
+ gdk_set_allowed_backends (NULL);
+
+ if (!wayland_display)
+ g_warning ("Failed to open Wayland display");
+
+ return wayland_display;
+}
+
+ShewExternalWindowWayland *
+shew_external_window_wayland_new (const char *handle_str)
+{
+ ShewExternalWindowWayland *external_window_wayland;
+ GdkDisplay *display;
+
+ display = get_wayland_display ();
+ if (!display)
+ {
+ g_warning ("No Wayland display connection, ignoring Wayland parent");
+ return NULL;
+ }
+
+ external_window_wayland = g_object_new (SHEW_TYPE_EXTERNAL_WINDOW_WAYLAND,
+ "display", display,
+ NULL);
+ external_window_wayland->handle_str = g_strdup (handle_str);
+
+ return external_window_wayland;
+}
+
+static void
+shew_external_window_wayland_set_parent_of (ShewExternalWindow *external_window,
+ GdkWindow *child_window)
+{
+ ShewExternalWindowWayland *external_window_wayland =
+ SHEW_EXTERNAL_WINDOW_WAYLAND (external_window);
+ char *handle_str = external_window_wayland->handle_str;
+
+#ifdef GDK_WINDOWING_WAYLAND
+ if (!gdk_wayland_window_set_transient_for_exported (child_window, handle_str))
+ g_warning ("Failed to set portal window transient for external parent");
+#endif
+}
+
+static void
+shew_external_window_wayland_dispose (GObject *object)
+{
+ ShewExternalWindowWayland *external_window_wayland =
+ SHEW_EXTERNAL_WINDOW_WAYLAND (object);
+
+ g_free (external_window_wayland->handle_str);
+
+ G_OBJECT_CLASS (shew_external_window_wayland_parent_class)->dispose (object);
+}
+
+static void
+shew_external_window_wayland_init (ShewExternalWindowWayland *external_window_wayland)
+{
+}
+
+static void
+shew_external_window_wayland_class_init (ShewExternalWindowWaylandClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ ShewExternalWindowClass *external_window_class = SHEW_EXTERNAL_WINDOW_CLASS (klass);
+
+ object_class->dispose = shew_external_window_wayland_dispose;
+
+ external_window_class->set_parent_of = shew_external_window_wayland_set_parent_of;
+}
diff --git a/subprojects/shew/src/shew-external-window-wayland.h
b/subprojects/shew/src/shew-external-window-wayland.h
new file mode 100644
index 0000000000..c9e9fd7914
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window-wayland.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#pragma once
+
+#include <glib-object.h>
+
+#include "shew-external-window.h"
+
+#define SHEW_TYPE_EXTERNAL_WINDOW_WAYLAND (shew_external_window_wayland_get_type ())
+G_DECLARE_FINAL_TYPE (ShewExternalWindowWayland, shew_external_window_wayland, SHEW,
EXTERNAL_WINDOW_WAYLAND, ShewExternalWindow)
+
+ShewExternalWindowWayland *shew_external_window_wayland_new (const char *handle_str);
diff --git a/subprojects/shew/src/shew-external-window-x11.c b/subprojects/shew/src/shew-external-window-x11.c
new file mode 100644
index 0000000000..5c4c8e69e8
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window-x11.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#include <errno.h>
+#include <gdk/gdk.h>
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+#include <stdlib.h>
+
+#include "shew-external-window-x11.h"
+
+static GdkDisplay *x11_display;
+
+struct _ShewExternalWindowX11
+{
+ ShewExternalWindow parent;
+
+ GdkWindow *foreign_gdk_window;
+};
+
+G_DEFINE_TYPE (ShewExternalWindowX11, shew_external_window_x11,
+ SHEW_TYPE_EXTERNAL_WINDOW)
+
+static GdkDisplay *
+get_x11_display (void)
+{
+ if (x11_display)
+ return x11_display;
+
+ gdk_set_allowed_backends ("x11");
+ x11_display = gdk_display_open (NULL);
+ gdk_set_allowed_backends (NULL);
+ if (!x11_display)
+ g_warning ("Failed to open X11 display");
+
+ return x11_display;
+}
+
+ShewExternalWindowX11 *
+shew_external_window_x11_new (const char *handle_str)
+{
+ ShewExternalWindowX11 *external_window_x11;
+ GdkDisplay *display;
+ int xid;
+ GdkWindow *foreign_gdk_window = NULL;
+
+ display = get_x11_display ();
+ if (!display)
+ {
+ g_warning ("No X display connection, ignoring X11 parent");
+ return NULL;
+ }
+
+ errno = 0;
+ xid = strtol (handle_str, NULL, 16);
+ if (errno != 0)
+ {
+ g_warning ("Failed to reference external X11 window, invalid XID %s", handle_str);
+ return NULL;
+ }
+
+#ifdef GDK_WINDOWING_X11
+ foreign_gdk_window = gdk_x11_window_foreign_new_for_display (display, xid);
+#endif
+
+ if (!foreign_gdk_window)
+ {
+ g_warning ("Failed to create foreign window for XID %d", xid);
+ return NULL;
+ }
+
+ external_window_x11 = g_object_new (SHEW_TYPE_EXTERNAL_WINDOW_X11,
+ "display", display,
+ NULL);
+ external_window_x11->foreign_gdk_window = foreign_gdk_window;
+
+ return external_window_x11;
+}
+
+static void
+shew_external_window_x11_set_parent_of (ShewExternalWindow *external_window,
+ GdkWindow *child_window)
+{
+ ShewExternalWindowX11 *external_window_x11 =
+ SHEW_EXTERNAL_WINDOW_X11 (external_window);
+
+ gdk_window_set_transient_for (child_window,
+ external_window_x11->foreign_gdk_window);
+}
+
+static void
+shew_external_window_x11_dispose (GObject *object)
+{
+ ShewExternalWindowX11 *external_window_x11 = SHEW_EXTERNAL_WINDOW_X11 (object);
+
+ g_clear_object (&external_window_x11->foreign_gdk_window);
+
+ G_OBJECT_CLASS (shew_external_window_x11_parent_class)->dispose (object);
+}
+
+static void
+shew_external_window_x11_init (ShewExternalWindowX11 *external_window_x11)
+{
+}
+
+static void
+shew_external_window_x11_class_init (ShewExternalWindowX11Class *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ ShewExternalWindowClass *external_window_class = SHEW_EXTERNAL_WINDOW_CLASS (klass);
+
+ object_class->dispose = shew_external_window_x11_dispose;
+
+ external_window_class->set_parent_of = shew_external_window_x11_set_parent_of;
+}
diff --git a/subprojects/shew/src/shew-external-window-x11.h b/subprojects/shew/src/shew-external-window-x11.h
new file mode 100644
index 0000000000..ed0bab44eb
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window-x11.h
@@ -0,0 +1,30 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#pragma once
+
+#include <glib-object.h>
+
+#include "shew-external-window.h"
+
+#define SHEW_TYPE_EXTERNAL_WINDOW_X11 (shew_external_window_x11_get_type ())
+G_DECLARE_FINAL_TYPE (ShewExternalWindowX11, shew_external_window_x11, SHEW, EXTERNAL_WINDOW_X11,
ShewExternalWindow)
+
+ShewExternalWindowX11 *shew_external_window_x11_new (const char *handle_str);
diff --git a/subprojects/shew/src/shew-external-window.c b/subprojects/shew/src/shew-external-window.c
new file mode 100644
index 0000000000..f468346459
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#include <string.h>
+
+#include "shew-external-window.h"
+#include "shew-external-window-x11.h"
+#include "shew-external-window-wayland.h"
+
+enum
+{
+ PROP_0,
+
+ PROP_DISPLAY,
+};
+
+typedef struct _ShewExternalWindowPrivate
+{
+ GdkDisplay *display;
+} ShewExternalWindowPrivate;
+
+G_DEFINE_TYPE_WITH_PRIVATE (ShewExternalWindow, shew_external_window, G_TYPE_OBJECT)
+
+ShewExternalWindow *
+shew_external_window_new_from_handle (const char *handle_str)
+{
+#ifdef GDK_WINDOWING_X11
+ {
+ const char x11_prefix[] = "x11:";
+ if (g_str_has_prefix (handle_str, x11_prefix))
+ {
+ ShewExternalWindowX11 *external_window_x11;
+ const char *x11_handle_str = handle_str + strlen (x11_prefix);
+
+ external_window_x11 = shew_external_window_x11_new (x11_handle_str);
+ return SHEW_EXTERNAL_WINDOW (external_window_x11);
+ }
+ }
+#endif
+#ifdef GDK_WINDOWING_WAYLAND
+ {
+ const char wayland_prefix[] = "wayland:";
+ if (g_str_has_prefix (handle_str, wayland_prefix))
+ {
+ ShewExternalWindowWayland *external_window_wayland;
+ const char *wayland_handle_str = handle_str + strlen (wayland_prefix);
+
+ external_window_wayland =
+ shew_external_window_wayland_new (wayland_handle_str);
+ return SHEW_EXTERNAL_WINDOW (external_window_wayland);
+ }
+ }
+#endif
+
+ g_warning ("Unhandled parent window type %s\n", handle_str);
+ return NULL;
+}
+
+void
+shew_external_window_set_parent_of (ShewExternalWindow *external_window,
+ GdkWindow *child_window)
+{
+ SHEW_EXTERNAL_WINDOW_GET_CLASS (external_window)->set_parent_of (external_window,
+ child_window);
+}
+
+/**
+ * shew_external_window_get_display:
+ * Returns: (transfer none)
+ */
+GdkDisplay *
+shew_external_window_get_display (ShewExternalWindow *external_window)
+{
+ ShewExternalWindowPrivate *priv =
+ shew_external_window_get_instance_private (external_window);
+
+ return priv->display;
+}
+
+static void
+shew_external_window_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ ShewExternalWindow *external_window = SHEW_EXTERNAL_WINDOW (object);
+ ShewExternalWindowPrivate *priv =
+ shew_external_window_get_instance_private (external_window);
+
+ switch (prop_id)
+ {
+ case PROP_DISPLAY:
+ g_set_object (&priv->display, g_value_get_object (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+shew_external_window_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ ShewExternalWindow *external_window = SHEW_EXTERNAL_WINDOW (object);
+ ShewExternalWindowPrivate *priv =
+ shew_external_window_get_instance_private (external_window);
+
+ switch (prop_id)
+ {
+ case PROP_DISPLAY:
+ g_value_set_object (value, priv->display);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+shew_external_window_init (ShewExternalWindow *external_window)
+{
+}
+
+static void
+shew_external_window_class_init (ShewExternalWindowClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->get_property = shew_external_window_get_property;
+ object_class->set_property = shew_external_window_set_property;
+
+ g_object_class_install_property (object_class,
+ PROP_DISPLAY,
+ g_param_spec_object ("display",
+ "GdkDisplay",
+ "The GdkDisplay instance",
+ GDK_TYPE_DISPLAY,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY |
+ G_PARAM_STATIC_STRINGS));
+}
diff --git a/subprojects/shew/src/shew-external-window.h b/subprojects/shew/src/shew-external-window.h
new file mode 100644
index 0000000000..105a8493be
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright © 2016 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Jonas Ådahl <jadahl redhat com>
+ */
+
+#pragma once
+
+#include <glib-object.h>
+#include <gtk/gtk.h>
+
+
+#define SHEW_TYPE_EXTERNAL_WINDOW (shew_external_window_get_type ())
+G_DECLARE_DERIVABLE_TYPE (ShewExternalWindow, shew_external_window, SHEW, EXTERNAL_WINDOW, GObject)
+
+struct _ShewExternalWindowClass
+{
+ GObjectClass parent_class;
+
+ void (*set_parent_of) (ShewExternalWindow *external_window,
+ GdkWindow *child_window);
+};
+
+ShewExternalWindow *shew_external_window_new_from_handle (const char *handle_str);
+
+void shew_external_window_set_parent_of (ShewExternalWindow *external_window,
+ GdkWindow *child_window);
+
+GdkDisplay *shew_external_window_get_display (ShewExternalWindow *external_window);
diff --git a/subprojects/shew/src/shew-window-exporter.c b/subprojects/shew/src/shew-window-exporter.c
new file mode 100644
index 0000000000..f9506823f0
--- /dev/null
+++ b/subprojects/shew/src/shew-window-exporter.c
@@ -0,0 +1,216 @@
+/*
+ * Copyright © 2020 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Florian Müllner <fmuellner gnome org>
+ */
+
+#include "shew-window-exporter.h"
+
+#ifdef GDK_WINDOWING_X11
+#include <gdk/gdkx.h>
+#endif
+#ifdef GDK_WINDOWING_WAYLAND
+#include <gdk/gdkwayland.h>
+#endif
+
+struct _ShewWindowExporter
+{
+ GObject parent;
+
+ GtkWindow *window;
+};
+
+G_DEFINE_TYPE (ShewWindowExporter, shew_window_exporter, G_TYPE_OBJECT)
+
+enum
+{
+ PROP_0,
+
+ PROP_WINDOW,
+};
+
+ShewWindowExporter *
+shew_window_exporter_new (GtkWindow *window)
+{
+ return g_object_new (SHEW_TYPE_WINDOW_EXPORTER,
+ "window", window,
+ NULL);
+}
+
+#ifdef GDK_WINDOWING_WAYLAND
+static void
+wayland_window_exported (GdkWindow *window,
+ const char *handle,
+ gpointer user_data)
+{
+ g_autoptr (GTask) task = user_data;
+
+ g_task_return_pointer (task, g_strdup_printf ("wayland:%s", handle), g_free);
+}
+#endif
+
+void
+shew_window_exporter_export (ShewWindowExporter *exporter,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ g_autoptr (GTask) task = NULL;
+ GtkWidget *widget;
+
+ g_return_if_fail (SHEW_IS_WINDOW_EXPORTER (exporter));
+
+ if (exporter->window == NULL)
+ {
+ g_task_report_new_error (exporter, callback, user_data,
+ shew_window_exporter_export,
+ G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+ "No window to export");
+ return;
+ }
+
+ task = g_task_new (exporter, NULL, callback, user_data);
+ g_task_set_source_tag (task, shew_window_exporter_export);
+
+ widget = GTK_WIDGET (exporter->window);
+
+#ifdef GDK_WINDOWING_X11
+ if (GDK_IS_X11_DISPLAY (gtk_widget_get_display (widget)))
+ {
+ GdkWindow *w = gtk_widget_get_window (widget);
+ guint32 xid = (guint32) gdk_x11_window_get_xid (w);
+
+ g_task_return_pointer (task, g_strdup_printf ("x11:%x", xid), g_free);
+ }
+#endif
+
+#ifdef GDK_WINDOWING_WAYLAND
+ if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (widget)))
+ {
+ GdkWindow *w = gtk_widget_get_window (widget);
+ gdk_wayland_window_export_handle (w, wayland_window_exported,
+ g_steal_pointer (&task), NULL);
+ }
+#endif
+
+ if (task != NULL && !g_task_get_completed (task))
+ {
+ g_task_return_new_error (task, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
+ "Unsupported windowing system");
+ }
+}
+
+char *
+shew_window_exporter_export_finish (ShewWindowExporter *exporter,
+ GAsyncResult *result,
+ GError **error)
+{
+ g_return_val_if_fail (SHEW_IS_WINDOW_EXPORTER (exporter), NULL);
+ g_return_val_if_fail (g_async_result_is_tagged (result, shew_window_exporter_export), NULL);
+
+ return g_task_propagate_pointer (G_TASK (result), error);
+}
+
+void
+shew_window_exporter_unexport (ShewWindowExporter *exporter)
+{
+ GtkWidget *widget;
+
+ g_return_if_fail (SHEW_IS_WINDOW_EXPORTER (exporter));
+
+ widget = GTK_WIDGET (exporter->window);
+
+#ifdef GDK_WINDOWING_WAYLAND
+ if (GDK_IS_WAYLAND_DISPLAY (gtk_widget_get_display (widget)))
+ {
+ GdkWindow *w = gtk_widget_get_window (widget);
+ gdk_wayland_window_unexport_handle (w);
+ }
+#endif
+}
+
+static void
+shew_window_exporter_dispose (GObject *object)
+{
+ ShewWindowExporter *exporter = SHEW_WINDOW_EXPORTER (object);
+
+ g_clear_object (&exporter->window);
+
+ G_OBJECT_CLASS (shew_window_exporter_parent_class)->dispose (object);
+}
+
+static void
+shew_window_exporter_set_property (GObject *object,
+ guint prop_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ ShewWindowExporter *exporter = SHEW_WINDOW_EXPORTER (object);
+
+ switch (prop_id)
+ {
+ case PROP_WINDOW:
+ g_set_object (&exporter->window, g_value_get_object (value));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+shew_window_exporter_get_property (GObject *object,
+ guint prop_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ ShewWindowExporter *exporter = SHEW_WINDOW_EXPORTER (object);
+
+ switch (prop_id)
+ {
+ case PROP_WINDOW:
+ g_value_set_object (value, exporter->window);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+ }
+}
+
+static void
+shew_window_exporter_init (ShewWindowExporter *exporter)
+{
+}
+
+static void
+shew_window_exporter_class_init (ShewWindowExporterClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+ object_class->get_property = shew_window_exporter_get_property;
+ object_class->set_property = shew_window_exporter_set_property;
+ object_class->dispose = shew_window_exporter_dispose;
+
+ g_object_class_install_property (object_class,
+ PROP_WINDOW,
+ g_param_spec_object ("window",
+ "GtkWindow",
+ "The GtkWindow to export",
+ GTK_TYPE_WINDOW,
+ G_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT_ONLY |
+ G_PARAM_STATIC_STRINGS));
+}
diff --git a/subprojects/shew/src/shew-window-exporter.h b/subprojects/shew/src/shew-window-exporter.h
new file mode 100644
index 0000000000..224fff52f9
--- /dev/null
+++ b/subprojects/shew/src/shew-window-exporter.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright © 2020 Red Hat, Inc
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Authors:
+ * Florian Müllner <fmuellner gnome org>
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#define SHEW_TYPE_WINDOW_EXPORTER (shew_window_exporter_get_type ())
+G_DECLARE_FINAL_TYPE (ShewWindowExporter, shew_window_exporter, SHEW, WINDOW_EXPORTER, GObject)
+
+ShewWindowExporter *shew_window_exporter_new (GtkWindow *window);
+
+void shew_window_exporter_export (ShewWindowExporter *exporter,
+ GAsyncReadyCallback callback,
+ gpointer user_data);
+
+char *shew_window_exporter_export_finish (ShewWindowExporter *exporter,
+ GAsyncResult *result,
+ GError **error);
+
+void shew_window_exporter_unexport (ShewWindowExporter *exporter);
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