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
2020-03-05 04:52:09 +01:00
parent f971b8426d
commit 6baf490aab
14 changed files with 1364 additions and 0 deletions
--- a/subprojects/shew/src/shew-external-window-wayland.c
+++ 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;
+}