QTreeWidget的勾选，未勾选，半勾选

[{"title":"（ 6 个子文件 5KB ） QTreeWidget的勾选，未勾选，半勾选","children":[{"title":"CheckedTree","children":[{"title":"main.cpp <span style='color:#111;'> 175B </span>","children":null,"spread":false},{"title":"untitled.pro.user <span style='color:#111;'> 23.20KB </span>","children":null,"spread":false},{"title":"untitled.pro <span style='color:#111;'> 1015B </span>","children":null,"spread":false},{"title":"widget.h <span style='color:#111;'> 625B </span>","children":null,"spread":false},{"title":"widget.cpp <span style='color:#111;'> 3.17KB </span>","children":null,"spread":false},{"title":"widget.ui <span style='color:#111;'> 769B </span>","children":null,"spread":false}],"spread":true}],"spread":true}]