/// <summary>
/// 设置元素状态
/// </summary>
/// <param name="value">选中状态</param>
/// <param name="updateChildren">是否更新子元素</param>
/// <param name="updateParent">是否更新父元素</param>
public void SetIsChecked(bool?value, bool updateChildren, bool updateParent)
{
if (value == mIsChecked)
{
return;
}
mIsChecked = value;
if (updateChildren && mIsChecked.HasValue)
{
foreach (var child in Children)
{
ICheckableTreeItem checkableItem = child as ICheckableTreeItem;
if (checkableItem != null)
{
checkableItem.SetIsChecked(mIsChecked, true, false);
}
}
}
if (updateParent && mParent != null)
{
ICheckableTreeItem parent = mParent as ICheckableTreeItem;
if (parent != null)
{
parent.VerifyCheckState();
}
}
SubPropertyChanged("IsChecked");
}
/// <summary>
/// 检查元素状态
/// </summary>
public void VerifyCheckState()
{
bool?state = null;
for (int i = 0; i < Children.Count; ++i)
{
ICheckableTreeItem checkableItem = Children[i] as ICheckableTreeItem;
if (checkableItem == null)
{
continue;
}
bool?current = checkableItem.IsChecked;
if (i == 0)
{
state = current;
}
else if (state != current)
{
state = null;
break;
}
}
SetIsChecked(state, false, true);
}
