diff --git a/README.md b/README.md
index 23c08f8..9a93102 100644
--- a/README.md
+++ b/README.md
@@ -17,10 +17,10 @@
 - 我们不推荐开发者全盘使用GuiLite；鼓励开发者在吃透代码后，根据自身业务特点，修改出更加丰富、个性的界面；或者发展出适合自己的UI框架。
 - 为了聚焦UI核心原理，GuiLite会一直保持单片机的代码体量。
 
-## 新功能：滑屏demo -- HelloSlide
-![HelloSlide](doc/HelloSlide.gif)
+## 新功能：动画demo -- HelloAnimation
+![HelloAnimation](doc/HelloAnimation.gif)
 
-**信不信由你，代码只有100+行！**[查阅代码](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloSlide/UIcode/UIcode.cpp)
+**信不信由你，代码只有100+行！**[查阅代码](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloAnimation/UIcode/UIcode.cpp)
 
 ## 功能介绍
 ### 卓越的跨平台能力
@@ -68,6 +68,7 @@ GuiLite只是一个框架，本身并不能生成UI。为了能够展示如何
 | --- | --- | --- | --- | --- |
 | HelloGuiLite | Windows, Linux | 初始化GuiLite，加载资源，布局界面元素，按钮响应 | [编译/运行](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloGuiLite/README.md) | 初级 |
 | HelloFont | Windows, Linux | 显示多种语言（不限：中、英文） | [编译/运行](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloFont/README.md) | 初级 |
+| HelloAnimation | Windows, Linux | 动画的应用 | [编译/运行](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloAnimation/README.md) | 初级 |
 | HelloSlide | Windows, Linux | 滑屏界面的应用 | [编译/运行](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HelloSlide/README.md) | 中级 |
 | HostMonitor | iOS, Mac, Android, Windows, Linux | 创建复杂界面，扩展自定义控件，适配全平台 | [编译/运行](https://gitee.com/idea4good/GuiLiteSamples/blob/master/HostMonitor/README.md) | 高级 |
 ## 开发文档
diff --git a/core/core_include/wnd.h b/core/core_include/wnd.h
index 515b233..797e9a7 100644
--- a/core/core_include/wnd.h
+++ b/core/core_include/wnd.h
@@ -24,7 +24,7 @@ typedef struct struct_wnd_tree
 {
 	c_wnd*					p_wnd;
 	unsigned int			resource_id;
-	char*					str;
+	const char*				str;
 	short   				x;
 	short   				y;
 	short   				width;
@@ -39,9 +39,9 @@ public:
 	c_wnd();
 	virtual ~c_wnd() {};
 	virtual const char* get_class_name() const { return "c_wnd"; }
-	virtual int connect(c_wnd *parent, unsigned short resource_id, char* str,
+	virtual int connect(c_wnd *parent, unsigned short resource_id, const char* str,
 		short x, short y, short width, short height, WND_TREE* p_child_tree = NULL);
-	virtual c_wnd* connect_clone(c_wnd *parent, unsigned short resource_id, char* str,
+	virtual c_wnd* connect_clone(c_wnd *parent, unsigned short resource_id, const char* str,
 		short x, short y, short width, short height, WND_TREE* p_child_tree = NULL);
 	void disconnect();
 	virtual c_wnd* clone() = 0;
@@ -55,7 +55,7 @@ public:
 	unsigned int get_style() const { return m_style; }
 	virtual void modify_style(unsigned int add_style = 0, unsigned int remove_style = 0);
 
-	void set_str(char* str) { m_str = str; }
+	void set_str(const char* str) { m_str = str; }
 	int is_focus_wnd() const;
 
 	void set_font_color(unsigned int color) { m_font_color = color; }
@@ -125,7 +125,7 @@ protected:
 	c_wnd*			m_top_child;
 	c_wnd*			m_prev_sibling;
 	c_wnd*			m_next_sibling;
-	char*			m_str;
+	const char*		m_str;
 
 	const FONT_INFO*	m_font_type;
 	unsigned int		m_font_color;
diff --git a/core/src/wnd.cpp b/core/src/wnd.cpp
index 6aa9151..32b539a 100644
--- a/core/src/wnd.cpp
+++ b/core/src/wnd.cpp
@@ -17,7 +17,7 @@ void c_wnd::pre_create_wnd()
 	m_style = GL_ATTR_VISIBLE | GL_ATTR_FOCUS;
 }
 
-int c_wnd::connect(c_wnd *parent, unsigned short resource_id, char* str,
+int c_wnd::connect(c_wnd *parent, unsigned short resource_id, const char* str,
 		   short x, short y, short width, short height, WND_TREE* p_child_tree )
 {
 	if(0 == resource_id)
@@ -94,7 +94,7 @@ int c_wnd::load_child_wnd(WND_TREE *p_child_tree)
 	return sum;
 }
 
-c_wnd* c_wnd::connect_clone(c_wnd *parent, unsigned short resource_id, char* str,
+c_wnd* c_wnd::connect_clone(c_wnd *parent, unsigned short resource_id, const char* str,
 		   short x, short y, short width, short height, WND_TREE* p_child_tree )
 {
 	if(0 == resource_id)
diff --git a/doc/HelloAnimation.gif b/doc/HelloAnimation.gif
new file mode 100644
index 0000000..e24a6fd
Binary files /dev/null and b/doc/HelloAnimation.gif differ