封装窗口焦点控制函数

CMakeLists.txt

@@ -48,6 +48,7 @@ pkg_check_modules(deps REQUIRED
     xcb
     xcb-aux
     xcb-cursor
+    xcb-icccm
     xcb-keysyms
     xcb-randr
     xcb-xfixes

src/atoms-list.txt

@@ -1 +1,6 @@
 _XKB_RULES_NAMES
+
+WM_PROTOCOLS
+WM_TAKE_FOCUS
+
+_NET_ACTIVE_WINDOW

src/xwindow.c

@@ -1,11 +1,14 @@
 #include "xwindow.h"
 
+#include <stdint.h>
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>
+#include <xcb/xcb_icccm.h>
 #include <xcb/xcb_keysyms.h>
 #include <xcb/xproto.h>
 
 #include "action.h"
+#include "atoms-extern.h"
 #include "utils.h"
 #include "wm.h"
 #include "xcursor.h"
@@ -127,3 +130,44 @@ void xwindow_grab_keys(xcb_window_t window, const keyboard_t *keys,
     }
   }
 }
+
+bool xwindow_send_event(xcb_window_t window, xcb_atom_t atom) {
+  bool exist = false;
+
+  xcb_get_property_cookie_t cookie =
+    xcb_icccm_get_wm_protocols(wm.xcb_conn, window, atom);
+  xcb_icccm_get_wm_protocols_reply_t reply;
+  if (xcb_icccm_get_wm_protocols_reply(wm.xcb_conn, cookie, &reply, nullptr)) {
+    for (uint32_t i = 0; !exist && i < reply.atoms_len; i++) {
+      exist = reply.atoms[i] == atom;
+    }
+    xcb_icccm_get_wm_protocols_reply_wipe(&reply);
+  }
+
+  if (exist) {
+    xcb_client_message_event_t ev;
+    p_clear(&ev, 1);
+    ev.response_type = XCB_CLIENT_MESSAGE;
+    ev.format = 32;
+    ev.window = window;
+    ev.type = WM_PROTOCOLS;
+    ev.data.data32[0] = atom;
+    ev.data.data32[1] = XCB_CURRENT_TIME;
+  }
+
+  return exist;
+}
+
+void xwindow_focus(xcb_window_t window) {
+  if (window == XCB_WINDOW_NONE || window == wm.screen->root) {
+    xcb_set_input_focus(wm.xcb_conn, XCB_INPUT_FOCUS_POINTER_ROOT,
+                        wm.screen->root, XCB_CURRENT_TIME);
+    xcb_delete_property(wm.xcb_conn, wm.screen->root, _NET_ACTIVE_WINDOW);
+  } else {
+    xcb_set_input_focus(wm.xcb_conn, XCB_INPUT_FOCUS_POINTER_ROOT, window,
+                        XCB_CURRENT_TIME);
+    xcb_change_property(wm.xcb_conn, XCB_PROP_MODE_REPLACE, wm.screen->root,
+                        _NET_ACTIVE_WINDOW, XCB_ATOM_WINDOW, 32, 1, &window);
+    xwindow_send_event(window, WM_TAKE_FOCUS);
+  }
+}

src/xwindow.h

@@ -15,3 +15,5 @@ visual_t *xwindow_get_xcb_visual(bool prefer_alpha);
 void xwindow_change_cursor(xcb_window_t window, cursor_t cursor);
 void xwindow_grab_keys(xcb_window_t window, const keyboard_t *keys,
                        int keys_length);
+bool xwindow_send_event(xcb_window_t window, xcb_atom_t atom);
+void xwindow_focus(xcb_window_t window);