DevExpress控件TreeList的复选框

DevExpress的TreeList要想在节点前面显示复选框,得修改属性OptionsView->ShowCheckBoxes=True

复选框的子节点与父节点统一的规则有:

1,选择某一节点时,该节点的子节点全部选择

2,取消某一节点时,该节点的子节点全部取消选择

3,某节点的子节点全部选择时,该节点选择

4,某节点的子节点未全部选择时,该节点不选择

代码就精彩了

        private void treeList1_AfterCheckNode(object sender, NodeEventArgs e) {
            SetCheckedChildNodes(e.Node, e.Node.CheckState);
            SetCheckedParentNodes(e.Node, e.Node.CheckState);
        }
        private void treeList1_BeforeCheckNode(object sender, CheckNodeEventArgs e) {
            e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
        }
        private void SetCheckedChildNodes(TreeListNode node, CheckState check) {
            for(int i = 0; i < node.Nodes.Count; i++) {
                node.Nodes[i].CheckState = check;
                SetCheckedChildNodes(node.Nodes[i], check);
            }
        }
        private void SetCheckedParentNodes(TreeListNode node, CheckState check) {
            if(node.ParentNode != null) {
                bool b = false;
                CheckState state;
                for(int i = 0; i < node.ParentNode.Nodes.Count; i++) {
                    state = (CheckState)node.ParentNode.Nodes[i].CheckState;
                    if(!check.Equals(state)) {
                        b = !b;
                        break;
                    }
                }
                node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;
                SetCheckedParentNodes(node.ParentNode, check);
            }
        }