1 files changed, 136 insertions, 0 deletions
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 0000000..7f08665
--- /dev/null
+++ b/subprojects/shew/src/shew-external-window-x11.c
@@ -0,0 +1,136 @@
+/*
+ * 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/x11/gdkx.h>
+#include <X11/Xlib.h>
+#endif
+#include <stdlib.h>
+
+#include "shew-external-window-x11.h"
+
+static GdkDisplay *x11_display;
+
+struct _ShewExternalWindowX11
+{
+  ShewExternalWindow parent;
+
+  int foreign_xid;
+};
+
+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;
+}
+
+static gboolean
+check_foreign_xid (GdkDisplay *display,
+                   int         xid)
+{
+  gboolean result = FALSE;
+#ifdef GDK_WINDOWING_X11
+  XWindowAttributes attrs;
+
+  gdk_x11_display_error_trap_push (display);
+  result = XGetWindowAttributes (GDK_DISPLAY_XDISPLAY (display), xid, &attrs);
+  if (gdk_x11_display_error_trap_pop (display))
+    return FALSE;
+
+#endif
+  return result;
+}
+
+ShewExternalWindowX11 *
+shew_external_window_x11_new (const char *handle_str)
+{
+  ShewExternalWindowX11 *external_window_x11;
+  GdkDisplay *display;
+  int xid;
+
+  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;
+    }
+
+  if (!check_foreign_xid (display, xid))
+    {
+      g_warning ("Failed to find 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_xid = xid;
+
+  return external_window_x11;
+}
+
+static void
+shew_external_window_x11_set_parent_of (ShewExternalWindow *external_window,
+                                        GdkSurface         *child_surface)
+{
+  ShewExternalWindowX11 *external_window_x11 =
+    SHEW_EXTERNAL_WINDOW_X11 (external_window);
+
+#ifdef GDK_WINDOWING_X11
+  XSetTransientForHint (GDK_SURFACE_XDISPLAY (child_surface),
+                        GDK_SURFACE_XID (child_surface),
+                        external_window_x11->foreign_xid);
+#endif
+}
+
+static void
+shew_external_window_x11_init (ShewExternalWindowX11 *external_window_x11)
+{
+}
+
+static void
+shew_external_window_x11_class_init (ShewExternalWindowX11Class *klass)
+{
+  ShewExternalWindowClass *external_window_class = SHEW_EXTERNAL_WINDOW_CLASS (klass);
+
+  external_window_class->set_parent_of = shew_external_window_x11_set_parent_of;
+}