设置 root 窗口鼠标样式

src/CMakeLists.txt

@@ -30,6 +30,7 @@ add_executable(${APP_NAME}
     color.c
     xcursor.c
     xwindow.c
+    event.c
 )
 
 # use C23

src/event.c

@@ -0,0 +1,68 @@
+#include "event.h"
+
+#include <glib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_event.h>
+#include <xcb/xproto.h>
+
+#include "monitor.h"
+#include "types.h"
+#include "utils.h"
+#include "wm.h"
+
+static void button_press(xcb_button_press_event_t *ev) {
+  if (ev->event == wm.current_monitor->bar_window) {
+    if (ev->event_x >= wm.current_monitor->tag_extent.start &&
+        ev->event_x <= wm.current_monitor->tag_extent.end) {
+      for (tag_t *tag = wm.current_monitor->tag_list; tag; tag = tag->next) {
+        if (ev->event_x >= tag->bar_extent.start &&
+            ev->event_x <= tag->bar_extent.end) {
+          monitor_select_tag(wm.current_monitor, tag->mask);
+          break;
+        }
+      }
+    }
+  }
+}
+
+static void handle_xcb_event(xcb_generic_event_t *event) {
+  uint8_t event_type = XCB_EVENT_RESPONSE_TYPE(event);
+
+  switch (event_type) {
+#define EVENT(type, callback) \
+  case type:                  \
+    callback((void *)event);  \
+    break
+
+    EVENT(XCB_BUTTON_PRESS, button_press);
+
+#undef EVENT
+  }
+}
+
+static gboolean xcb_event_loop(GIOChannel *channel, GIOCondition condition,
+                               gpointer user_data) {
+  if (condition & (G_IO_HUP | G_IO_ERR)) {
+    wm_quit();
+    return false;
+  }
+
+  xcb_generic_event_t *event = nullptr;
+  while ((event = xcb_poll_for_event(wm.xcb_conn))) {
+    handle_xcb_event(event);
+    p_delete(&event);
+  }
+
+  return true;
+}
+
+void setup_event_loop(void) {
+  int fd = xcb_get_file_descriptor(wm.xcb_conn);
+  GIOChannel *channel = g_io_channel_unix_new(fd);
+  g_io_channel_set_encoding(channel, nullptr, nullptr);
+  GIOCondition cond = G_IO_IN | G_IO_HUP | G_IO_ERR;
+  g_io_add_watch(channel, cond, xcb_event_loop, nullptr);
+  g_io_channel_unref(channel);
+}

src/event.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void setup_event_loop(void);

src/monitor.c

@@ -41,6 +41,19 @@ uint32_t monitor_initialize_tag(monitor_t *monitor, const char **tags,
   return tag_count;
 }
 
+void monitor_select_tag(monitor_t *monitor, uint32_t tag_mask) {
+  if (monitor->selected_tag->mask == tag_mask) return;
+
+  for (tag_t *tag = monitor->tag_list; tag; tag = tag->next) {
+    if (tag->mask == tag_mask) {
+      monitor->selected_tag = tag;
+      monitor_draw_bar(monitor);
+      xcb_flush(wm.xcb_conn);
+      break;
+    }
+  }
+}
+
 static void tag_clean(tag_t *tag) {
   tag_t *next_tag = nullptr;
   for (tag_t *t = tag; t; t = next_tag) {

src/wm.c

@@ -20,11 +20,13 @@
 #include "buffer.h"
 #include "color.h"
 #include "default_config.h"
+#include "event.h"
 #include "monitor.h"
 #include "text.h"
 #include "types.h"
 #include "utils.h"
 #include "xcursor.h"
+#include "xwindow.h"
 
 static void wm_setup_signal(void);
 static void wm_check_other_wm(void);
@@ -176,6 +178,7 @@ static bool wm_detect_monitor_by_randr(void) {
       prev_monitor->next = monitor;
     } else {
       wm.monitor_list = monitor;
+      wm.current_monitor = monitor;
     }
 
     prev_monitor = monitor;
@@ -224,6 +227,7 @@ static bool wm_detect_monitor_by_xinerama(void) {
       prev_monitor->next = monitor;
     } else {
       wm.monitor_list = monitor;
+      wm.current_monitor = monitor;
     }
 
     prev_monitor = monitor;
@@ -246,6 +250,7 @@ void wm_detect_monitor(void) {
   monitor->geometry.height = wm.screen->height_in_pixels;
 
   wm.monitor_list = monitor;
+  wm.current_monitor = monitor;
 }
 
 void wm_scan_clients(void) {}
@@ -280,6 +285,7 @@ static void wm_setup(void) {
     monitor_draw_bar(m);
   }
 
+  xwindow_change_cursor(wm.screen->root, cursor_normal);
   xcb_flush(wm.xcb_conn);
 }
 
@@ -333,6 +339,8 @@ int main(int argc, char *argv[]) {
 
   debug_show_monitor_list();
 
+  setup_event_loop();
+
   if (wm.loop == nullptr) {
     wm.loop = g_main_loop_new(nullptr, FALSE);
     g_main_loop_run(wm.loop);

src/xwindow.c

@@ -100,3 +100,8 @@ visual_t *xwindow_get_xcb_visual(bool prefer_alpha) {
 
   return visual;
 }
+
+void xwindow_change_cursor(xcb_window_t window, cursor_t cursor) {
+  xcb_params_cw_t params = {.cursor = xcursor_get_xcb_cursor(cursor)};
+  xcb_aux_change_window_attributes(wm.xcb_conn, window, XCB_CW_CURSOR, &params);
+}

src/xwindow.h

@@ -3,9 +3,12 @@
 #include <stdint.h>
 #include <xcb/xproto.h>
 
+#include "xcursor.h"
+
 typedef struct visual_t {
   uint8_t depth;
   xcb_visualtype_t *visual;
 } visual_t;
 
 visual_t *xwindow_get_xcb_visual(bool prefer_alpha);
+void xwindow_change_cursor(xcb_window_t window, cursor_t cursor);