通过编程方式更改子节点时，如何自动更新父节点的CheckState? [英] How to Auto Update the CheckState of the parent nodes When Child's Changed Programmingly?

问题描述

我正在将Delphi XE3与Virtual TreeView一起使用.

I am using Delphi XE3 with Virtual TreeView.

我已启用toAutoTristateTracking选项.

I have enabled the toAutoTristateTracking option.

当我尝试手动更改节点的检查状态时，受影响的节点的检查状态也会更改.

WHen I try to change the check state of a node manually, then the affected node's checkstate will change as well.

但是，例如，当我通过编程方式执行相同的操作时

However, when I do the same thing programmingly, for example

PNode^.CheckState := csMixedNormal;

或

PNode^.CheckState := csCheckedNormal;

仅PNode检查状态将被更改.受影响的节点将不会更改其状态.为什么?

Only PNode check state will be changed. The affected nodes will not change their states. Why?

推荐答案

不直接访问节点的 CheckState .使用 TBaseVirtualTree 的数组属性 CheckState [Node:PVirtualNode] 读取/写入检查状态.通过该属性设置检查状态将应用与复选框相关的功能，并触发相应的事件，例如 OnChecking ， OnChecked ， OnInitNode ，...

Don't access CheckState of a node directly. Use array property CheckState[Node: PVirtualNode] of TBaseVirtualTree to read/write check state. Setting check state via the property will apply functionality related to tick boxes as well as fire appropriate events like OnChecking, OnChecked, OnInitNode, ...

这应该改为:

VirtualStringTree1.CheckState[PNode] := csCheckedNormal;

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