Qt按钮收缩，点击show按钮，在按钮后面缓缓展开三个按钮，再次点击show按钮，后面的三个按钮缓缓缩回

[{"title":"（15个子文件9KB）Qt按钮收缩，点击show按钮，在按钮后面缓缓展开三个按钮，再次点击show按钮，后面的三个按钮缓缓缩回","children":[{"title":"testBtnShrinkage","children":[{"title":"untitled.pro.user <span style='color:#111;'>23.03KB</span>","children":null,"spread":false},{"title":"form.h <span style='color:#111;'>257B</span>","children":null,"spread":false},{"title":"widget.h <span style='color:#111;'>592B</span>","children":null,"spread":false},{"title":"form.ui <span style='color:#111;'>1.53KB</span>","children":null,"spread":false},{"title":"widget.ui <span style='color:#111;'>1.96KB</span>","children":null,"spread":false},{"title":"fatherform.h <span style='color:#111;'>578B</span>","children":null,"spread":false},{"title":"untitled.pro <span style='color:#111;'>540B</span>","children":null,"spread":false},{"title":"main.cpp <span style='color:#111;'>246B</span>","children":null,"spread":false},{"title":"mainwindow.ui <span style='color:#111;'>822B</span>","children":null,"spread":false},{"title":"mainwindow.cpp <span style='color:#111;'>694B</span>","children":null,"spread":false},{"title":"mainwindow.h <span style='color:#111;'>486B</span>","children":null,"spread":false},{"title":"fatherform.ui <span style='color:#111;'>698B</span>","children":null,"spread":false},{"title":"form.cpp <span style='color:#111;'>287B</span>","children":null,"spread":false},{"title":"widget.cpp <span style='color:#111;'>1.60KB</span>","children":null,"spread":false},{"title":"fatherform.cpp <span style='color:#111;'>1.46KB</span>","children":null,"spread":false}],"spread":false}],"spread":true}]