delphi获取目录下所有文件名
https://www.cnblogs.com/zhangzhifeng/p/5746026.html
delphi 控件背景透明代码
https://www.cnblogs.com/blogpro/p/11339119.html
Delphi控件的透明与不透明(要挨个解释一下原因),对InvalidateControl的关键理解
https://www.cnblogs.com/findumars/p/4756420.html
https://www.cnblogs.com/zhangzhifeng/p/5746026.html
https://www.cnblogs.com/blogpro/p/11339119.html
https://www.cnblogs.com/findumars/p/4756420.html