TODO/待办
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- [ ] Solve the bug that the vertical position of the text is wrong when the `Text` class is enlarged  
解决`Text`类放大时，文本纵向位置错误的 bug

- [ ] Solve the bug that text shrinks and overflows after zooming text controls  
解决文本类控件缩放后文本产生缩水和溢出的 bug

- [ ] Fixed the bug of deletion misalignment when there is too much text in the `Text` class  
解决`Text`类中文本过多时删减错位的 bug

- [ ] Perfect the scroll bar function of `Text` class  
完善`Text`类的滚动条功能

- [ ] Perfection and optimization of zoom function  
对缩放功能的完善和优化

- [ ] Try adding a new widget: `Switch`  
尝试新增控件：开关 (`Switch`)

- [ ] Try adding a new widget: `ToolTip`  
尝试新增控件：提示框 (`ToolTip`)

- [ ] Try adding support for some MarkDown syntax  
尝试增加对部分 Markdown 语法的支持

- [ ] Try adding a new pattern of no progress to the `Progressbar` widget  
尝试为进度条控件增加无进度的新模式