1 files changed, 83 insertions, 0 deletions
diff --git a/libtopmenu-server/topmenu-server.c b/libtopmenu-server/topmenu-server.c
new file mode 100644
index 0000000..a907d47
--- /dev/null
+++ b/libtopmenu-server/topmenu-server.c
@@ -0,0 +1,83 @@
+#include <gtk/gtk.h>
+
+#include "topmenu-server.h"
+
+#include "../global.h"
+
+static GdkAtom selection_atom = GDK_NONE;
+static GtkClipboard *selection_clipboard = NULL;
+static GList *server_widgets = NULL;
+
+static void handle_selection_owner_change(GtkClipboard *clipboard, GdkEvent *event, gpointer user_data);
+
+static void init_selection_monitor()
+{
+	if (!selection_clipboard || selection_atom == GDK_NONE) {
+		selection_atom = gdk_atom_intern_static_string(ATOM_TOPMENU_SERVER_SELECTION);
+		selection_clipboard = gtk_clipboard_get(selection_atom);
+		// Used to monitor the current owner of the server selection
+		g_signal_connect(selection_clipboard, "owner-change",
+		                 G_CALLBACK(handle_selection_owner_change), NULL);
+	}
+}
+
+/** Returns the current stub this process wants to set as owner of the server_selection. */
+static GdkWindow *get_front_server_stub()
+{
+	if (server_widgets) {
+		GtkWidget *widget = server_widgets->data;
+		gpointer data = g_object_get_data(G_OBJECT(widget), OBJECT_DATA_KEY_SERVER_STUB);
+		g_return_val_if_fail(data, NULL);
+		return GDK_WINDOW(data);
+	} else {
+		return NULL;
+	}
+}
+
+static void update_selection_owner(guint32 time)
+{
+	GdkWindow *our_owner = get_front_server_stub();
+	if (our_owner == NULL) return; // Nothing to do
+
+	GdkWindow *cur_owner = gdk_selection_owner_get(selection_atom);
+	if (cur_owner != our_owner) {
+		g_debug("Setting this process as owner of the selection");
+		int res = gdk_selection_owner_set(our_owner, selection_atom, time, TRUE);
+		g_debug("Result = %d", res);
+	}
+}
+
+static void handle_selection_owner_change(GtkClipboard *clipboard, GdkEvent *event, gpointer user_data)
+{
+	update_selection_owner(event->selection.time);
+}
+
+void topmenu_server_register_server_widget(GtkWidget *widget)
+{
+	GdkWindow *window = gtk_widget_get_window(widget);
+	g_return_if_fail(window);
+
+	init_selection_monitor();
+
+	g_return_if_fail(g_object_get_data(G_OBJECT(widget), OBJECT_DATA_KEY_SERVER_STUB) == NULL);
+
+	GdkWindowAttr stub_attr = { 0 };
+	stub_attr.wclass = GDK_INPUT_ONLY;
+	stub_attr.override_redirect = TRUE;
+	GdkWindow *stub = gdk_window_new(window, &stub_attr, GDK_WA_NOREDIR);
+
+	g_object_set_data_full(G_OBJECT(widget), OBJECT_DATA_KEY_SERVER_STUB,
+	                       stub, (GDestroyNotify)gdk_window_destroy);
+
+	server_widgets = g_list_prepend(server_widgets, widget);
+	update_selection_owner(GDK_CURRENT_TIME);
+}
+
+void topmenu_server_unregister_server_widget(GtkWidget *widget)
+{
+	g_return_if_fail(g_object_get_data(G_OBJECT(widget), OBJECT_DATA_KEY_SERVER_STUB) != NULL);
+	server_widgets = g_list_remove_all(server_widgets, widget);
+	gpointer data = g_object_steal_data(G_OBJECT(widget), OBJECT_DATA_KEY_SERVER_STUB);
+	GdkWindow *stub = GDK_WINDOW(data);
+	gdk_window_destroy(stub);
+}