diff --git a/docs/changes.md b/docs/changes.md
index e2977e317..ac0f7a8cf 100644
--- a/docs/changes.md
+++ b/docs/changes.md
@@ -1,7 +1,8 @@
 # 最新动态
 
 2021/04/06
-  * add idle\_queue\_ex/timer\_queue\_ex for script binding.
+  * 增加 idle\_queue\_ex/timer\_queue\_ex 方便脚本绑定时使用。
+  * 增加 hscroll\_label检测焦点状态下长度变化重新播放动画的机制（感谢智明提供补丁）
 
 2021/04/04
   * 增加 gui\_app\_start\_ex，方便嵌入式系统指定资源路径。
diff --git a/src/ext_widgets/scroll_label/hscroll_label.c b/src/ext_widgets/scroll_label/hscroll_label.c
index af9818827..914752423 100644
--- a/src/ext_widgets/scroll_label/hscroll_label.c
+++ b/src/ext_widgets/scroll_label/hscroll_label.c
@@ -40,6 +40,12 @@ static ret_t hscroll_label_do_paint_self(widget_t* widget, canvas_t* c, uint32_t
   hscroll_label_t* hscroll_label = HSCROLL_LABEL(widget);
 
   hscroll_label->text_w = canvas_measure_text(c, text->str, text->size);
+  if (hscroll_label->text_w != hscroll_label->old_text_w) {
+    if (tk_str_eq(widget->state, WIDGET_STATE_FOCUSED)) {
+      hscroll_label_start(widget);
+    }
+    hscroll_label->old_text_w = hscroll_label->text_w;
+  }
   if (w < hscroll_label->text_w && hscroll_label->ellipses && !hscroll_label_is_running(widget)) {
     r = rect_init(left_margin, 0, w, widget->h);
 
@@ -332,6 +338,10 @@ static ret_t hscroll_label_on_timer(const timer_info_t* info) {
     }
   }
 
+  if (ret != RET_REPEAT) {
+    hscroll_label->timer_id = TK_INVALID_ID;
+  }
+
   return ret;
 }
 
diff --git a/src/ext_widgets/scroll_label/hscroll_label.h b/src/ext_widgets/scroll_label/hscroll_label.h
index 8e114c6c9..d55f62171 100644
--- a/src/ext_widgets/scroll_label/hscroll_label.h
+++ b/src/ext_widgets/scroll_label/hscroll_label.h
@@ -125,6 +125,7 @@ typedef struct _hscroll_label_t {
   int32_t text_w;
 
   /*private*/
+  int32_t old_text_w;
   uint32_t timer_id;
   uint32_t elapsed;
   bool_t paused;