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);
}
}