feat(backend): 支持鼠标抓取功能

src/core/event.h

@@ -27,12 +27,6 @@ typedef struct key_press_event_t {
   uint32_t keycode;
 } key_press_event_t;
 
-typedef enum button_t {
-  ZDWM_BUTTON_LEFT,
-  ZDWM_BUTTON_RIGHT,
-  ZDWM_BUTTON_MIDDLE,
-} button_t;
-
 typedef struct pointer_button_event_t {
   modifier_mask_t modifiers;
   button_t button;

src/core/plan.c

@@ -20,6 +20,8 @@ static void free_memory_hold_by_effects(effect_t *effects, size_t count) {
     case ZDWM_EFFECT_BIND_KEY:
       p_delete(&effect->as.bind_key.keys);
       break;
+    case ZDWM_EFFECT_GRAB_BUTTON:
+      p_delete(&effect->as.grab_button.buttons);
     default:
     }
   }

src/core/plan.h

@@ -20,6 +20,7 @@ typedef enum effect_type_t {
   ZDWM_EFFECT_CHANGE_WINDOW_LIST,
   ZDWM_EFFECT_RESTACK_WINDOWS,
   ZDWM_EFFECT_BIND_KEY,
+  ZDWM_EFFECT_GRAB_BUTTON,
 } effect_type_t;
 
 typedef struct effect_move_window_t {
@@ -48,6 +49,12 @@ typedef struct effect_bind_key_t {
   size_t count;
 } effect_bind_key_t;
 
+typedef struct effect_grab_button_t {
+  window_id_t window;
+  const grab_button_t *buttons;
+  size_t count;
+} effect_grab_button_t;
+
 typedef struct effect_bool_window_t {
   window_id_t window;
   bool value;
@@ -69,6 +76,7 @@ typedef struct effect_t {
     effect_window_list_t change_window_list;
     effect_window_list_t restack_windows;
     effect_bind_key_t bind_key;
+    effect_grab_button_t grab_button;
   } as;
 } effect_t;
 

src/core/policy.c

@@ -762,6 +762,24 @@ static void push_window_list_effect(const state_t *state, plan_t *plan) {
   plan_push_effect(plan, &effect);
 }
 
+static void plan_push_grab_button_effect(plan_t *plan, window_id_t window) {
+  /* TODO: 后续会改成配置 */
+  static const grab_button_t buttons[] = {
+    [0] = {.modifiers = ZDWM_MOD_4, .button = ZDWM_BUTTON_LEFT},
+    [1] = {.modifiers = ZDWM_MOD_4, .button = ZDWM_BUTTON_RIGHT},
+  };
+
+  constexpr const size_t count = countof(buttons);
+  auto btns                    = p_new(grab_button_t, count);
+  memcpy(btns, buttons, sizeof(buttons));
+
+  effect_t grab_button_effect = {
+    .type           = ZDWM_EFFECT_GRAB_BUTTON,
+    .as.grab_button = {.window = window, .buttons = btns, .count = count},
+  };
+  plan_push_effect(plan, &grab_button_effect);
+}
+
 static void manage_window(
   const policy_context_t *ctx,
   const manage_window_command_t *command,
@@ -774,6 +792,7 @@ static void manage_window(
   state_window_set_workspace(state, window_id, workspace_id);
   state_window_set_floating(state, window_id, command->floating);
   set_foucs_window(ctx, workspace_id, window_id, plan);
+  plan_push_grab_button_effect(plan, window_id);
   push_window_list_effect(state, plan);
   listeners_notify_window_added(ctx->listeners, state, window_id);
 

src/core/types.h

@@ -55,6 +55,18 @@ typedef struct key_bind_t {
   keysym_t keysym;
 } key_bind_t;
 
+typedef enum button_t {
+  ZDWM_BUTTON_NONE,
+  ZDWM_BUTTON_LEFT,
+  ZDWM_BUTTON_RIGHT,
+  ZDWM_BUTTON_MIDDLE,
+} button_t;
+
+typedef struct grab_button_t {
+  modifier_mask_t modifiers;
+  button_t button;
+} grab_button_t;
+
 typedef enum window_state_request_type_t {
   ZDWM_WINDOW_STATE_REQUEST_FULLSCREEN,
   ZDWM_WINDOW_STATE_REQUEST_MAXIMIZED,