调整窗口堆叠顺序

src/include/xcb.h

@@ -50,6 +50,14 @@ char *get_window_name(xcb_window_t window);
 void set_window_event_mask(xcb_window_t window, bool clear);
 void change_window_border_color(xcb_window_t window, uint32_t argb);
 void focus_window(xcb_window_t window);
+/**
+ * @brief 将 window 置于堆叠顺序的顶部
+ */
+void raise_window(xcb_window_t window);
+/**
+ * @brief 在堆叠顺序中将 window 置于 sibling 之下
+ */
+void place_window_below_sibling(xcb_window_t window, xcb_window_t sibling);
 
 typedef struct bar_cairo_params_t {
   xcb_connection_t *conn;
@@ -122,3 +130,8 @@ void set_window_state(xcb_window_t window, wm_state_t state);
 void set_window_list(xcb_window_t *list, uint32_t length);
 
 bool get_pointer_position(int32_t *x, int32_t *y);
+
+/**
+ * @brief 非阻塞检查特定事件掩码（模拟 XCheckMaskEvent）
+ */
+bool xcb_check_mask_event(xcb_event_mask_t event_mask);

src/main.c

@@ -829,7 +829,21 @@ void arrange(monitor_t *monitor) {
 
 void restack(monitor_t *monitor) {
   draw_monitor_bar(monitor);
-  /* TODO: */
+  if (!monitor->selected_client) return;
+  if (monitor->selected_client->floating || !monitor->layout->arrange) {
+    raise_window(monitor->selected_client->window);
+  }
+  if (monitor->layout->arrange) {
+    xcb_window_t sibling = monitor->bar_window;
+    for (client_t *c = monitor->clients_stack; c; c = c->stack_next) {
+      if (!c->floating && CLIENT_VISIBLE(c)) {
+        place_window_below_sibling(c->window, sibling);
+        sibling = c->window;
+      }
+    }
+  }
+  flush_xcb_connection();
+  while (xcb_check_mask_event(XCB_EVENT_MASK_ENTER_WINDOW));
 }
 void focus(client_t *client) {
   if (!client || !CLIENT_VISIBLE(client)) {

src/xcb/window.c

@@ -300,3 +300,18 @@ void focus_window(xcb_window_t window) {
     send_event(window, atom_wm_take_focus);
   }
 }
+
+void raise_window(xcb_window_t window) {
+  xcb_params_configure_window_t params = {.stack_mode = XCB_STACK_MODE_TOP_IF};
+  xcb_aux_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, &params);
+  xcb_flush(conn);
+}
+
+void place_window_below_sibling(xcb_window_t window, xcb_window_t sibling) {
+  uint16_t mask = XCB_CONFIG_WINDOW_STACK_MODE | XCB_CONFIG_WINDOW_SIBLING;
+  xcb_params_configure_window_t params = {
+    .stack_mode = XCB_STACK_MODE_BELOW,
+    .sibling = sibling,
+  };
+  xcb_aux_configure_window(conn, window, mask, &params);
+}

src/xcb/xcb.c

@@ -331,3 +331,12 @@ bool get_pointer_position(int32_t *x, int32_t *y) {
 
   return false;
 }
+
+bool xcb_check_mask_event(xcb_event_mask_t event_mask) {
+  xcb_generic_event_t *event = xcb_poll_for_event(conn);
+  if (!event) return false;
+
+  bool result = XCB_EVENT_RESPONSE_TYPE(event) == event_mask;
+  free(event);
+  return result;
+}