fix: source change & handler error

[shiyiya]

Pull Request Template

Description

• 监听函数一直是旧的，状态更新后函数内 state 为旧值（如：example 里面的按钮功能无法工作）
• source 修改时重置进度条

Fixes # (issue)

How Has This Been Tested?

• run example

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• Test A
• Test B

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules