1
0
Fork 0
NotesUESTC/硬件开发笔记/ESP32/X-Track笔记.md

20 lines
735 B
Markdown
Raw Permalink Blame History

This file contains invisible Unicode characters!

This file contains invisible Unicode characters that may be processed differently from what appears below. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to reveal hidden characters.

This file contains ambiguous Unicode characters that may be confused with others in your current locale. If your use case is intentional and legitimate, you can safely ignore this warning. Use the Escape button to highlight these characters.

## 一、X-Track执行页面的Unload过程
**1.1 在PageView中不需要删除对象**
准确的来说应该是通过root节点创建的对象的是不需要删除的对于非root节点创建的对象如动画、style是需要在delete函数中删除的否则会造成内存泄漏。
```c
lv_obj_del_async(base->root);
base->root = nullptr;
base->priv.IsCached = false;
base->onViewDidUnload();
```
从上面的代码可以看出X-Track先执行root节点的删除然后再调用onViewDidUnload()函数。由于在删除父节点的时候子节点也会被删除所以不建议在PageView里面调用lv_obj_del()函数。
$$
y=k*(x-0)+b \\= k*(x-xt)+b = k*x-k*xt+b + k*xt
$$