+
+/*
+ * Updates _NET_ACTIVE_WINDOW with the currently focused window.
+ *
+ * EWMH: The window ID of the currently active window or None if no window has
+ * the focus.
+ *
+ */
+void ewmh_update_active_window(xcb_window_t window) {
+ xcb_change_property(global_conn, XCB_PROP_MODE_REPLACE, root,
+ atoms[_NET_ACTIVE_WINDOW], WINDOW, 32, 1, &window);
+}
+
+/*
+ * Updates the workarea for each desktop.
+ *
+ * EWMH: Contains a geometry for each desktop. These geometries specify an area
+ * that is completely contained within the viewport. Work area SHOULD be used by
+ * desktop applications to place desktop icons appropriately.
+ *
+ */
+void ewmh_update_workarea() {
+ Workspace *ws;
+ int num_workspaces = 0, count = 0;
+ Rect last_rect = {0, 0, 0, 0};
+
+ /* Get the number of workspaces */
+ TAILQ_FOREACH(ws, workspaces, workspaces) {
+ /* Check if we need to initialize last_rect. The case that the
+ * first workspace is all-zero may happen when the user
+ * assigned workspace 2 for his first screen, for example. Thus
+ * we need an initialized last_rect in the very first run of
+ * the following loop. */
+ if (last_rect.width == 0 && last_rect.height == 0 &&
+ ws->rect.width != 0 && ws->rect.height != 0) {
+ memcpy(&last_rect, &(ws->rect), sizeof(Rect));
+ }
+ num_workspaces++;
+ }
+
+ DLOG("Got %d workspaces\n", num_workspaces);
+ uint8_t *workarea = smalloc(sizeof(Rect) * num_workspaces);
+ TAILQ_FOREACH(ws, workspaces, workspaces) {
+ DLOG("storing %d: %dx%d with %d x %d\n", count, ws->rect.x,
+ ws->rect.y, ws->rect.width, ws->rect.height);
+ /* If a workspace is not yet initialized and thus its
+ * dimensions are zero, we will instead put the dimensions
+ * of the last workspace in the list. For example firefox
+ * intersects all workspaces and does not cope so well with
+ * an all-zero workspace. */
+ if (ws->rect.width == 0 || ws->rect.height == 0) {
+ DLOG("re-using last_rect (%dx%d, %d, %d)\n",
+ last_rect.x, last_rect.y, last_rect.width,
+ last_rect.height);
+ memcpy(workarea + (sizeof(Rect) * count++), &last_rect, sizeof(Rect));
+ continue;
+ }
+ memcpy(workarea + (sizeof(Rect) * count++), &(ws->rect), sizeof(Rect));
+ memcpy(&last_rect, &(ws->rect), sizeof(Rect));
+ }
+ xcb_change_property(global_conn, XCB_PROP_MODE_REPLACE, root,
+ atoms[_NET_WORKAREA], CARDINAL, 32,
+ num_workspaces * (sizeof(Rect) / sizeof(uint32_t)),
+ workarea);
+ free(workarea);
+ xcb_flush(global_conn);
+}