Tree组件可以控制checkbox的显示，以及checkbox点击的事件

[sky124380729]

This function solves the problem (这个功能解决的问题)

1.目前只能控制Checbox的Disabled的，不能控制显示 2.目前只能拿到Checked keys变化的事件，没有checkbox点击的事件

Expected API (期望的 API)

1. TreeOption Properties { checkable: boolean //When Tree is checkable, set TreeNode display Checkbox or not }
2. onCheck: (checkedKeys, e:{checked: bool, checkedNodes, node, event}) => void

[sky124380729]

这个onCheck对我来说很重要，我需要拿到当前节点是选中还是取消，还有内部的option。 目前只有checkedKeys更新事件，取消选中的时候我拿不到子节点的数据以及option

[sky124380729]

help

[Ikki-Dai]

+1 want to disable uncheckable on parent node and only keep it expandable while click also want childern node is checkable

[jahnli]

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