/// <summary>
/// 创建权限树视图根节点，根节点即“所有权限”。
/// </summary>
/// <returns></returns>
private PermissionTreeViewModel CreateRoot()
{
var root = new PermissionTreeViewModel()
{
Text = "所有权限"
};
ExtensionModelService.PermissionGroups.ForEach(pair =>
{
// 创建二级视图节点，即插件
var bundle = new PermissionTreeViewModel()
{
Text = pair.Key.Name, Parent = root
};
root.Children.Add(bundle);
pair.Value.ForEach(group => // 创建子视图节点
{
var groupPermissionTreeViewModel = new PermissionTreeViewModel()
{
Text = group.Name, Parent = bundle, Tag = group
};
bundle.Children.Add(groupPermissionTreeViewModel);
Initialize(groupPermissionTreeViewModel, group);
}
);
});
return(root);
}
private void Initialize(PermissionTreeViewModel root) // 初始化权限树视图模型。
{
PermissionTreeViewModels.Clear(); // 清空原有节点
PermissionTreeViewModels.Add(root); // 创建树
InitializePermissionSelected(); // 根据当前角色，选择其拥有的权限
}
protected void InitializePermissionSelected()
{
_initializePermissionSelected = true;
// 如果当前角色为空，则默认不选择
if (UnselectAll())
{
foreach (var permissionTreeViewModel in PermissionTreeViewModels)
{
permissionTreeViewModel.IsSelected = false;
}
}
// 如果是管理员角色，默认全选
else if (SelectAll())
{
foreach (var permissionTreeViewModel in PermissionTreeViewModels)
{
permissionTreeViewModel.IsSelected = true;
}
}
else // 根据当前角色拥有的权限进行处理
{
// 获取当前角色的权限
// 将递归转换成非递归，来设置子节点的选中情况
var permissionViewModels = new List <PermissionTreeViewModel>();
permissionViewModels.AddRange(PermissionTreeViewModels.ToArray());
PermissionTreeViewModel current = null;
PermissionData permissionDefinition = null;
while (permissionViewModels.Count > 0) // 如果列表不为空，继续初始化
{
current = permissionViewModels[0];
permissionViewModels.RemoveAt(0);
permissionViewModels.AddRange(current.Children);
// 如果当前节点对应于PermissionData，则设置选中状态
if (current.Tag != null && !(current.Tag is PermissionGroupData))
{
permissionDefinition = current.Tag as PermissionData;
// 选中状态由数据库是否存在当前权限为准
current.IsSelected = IsSelected(permissionDefinition);
// 监听当前叶子节点的选择变更事件，并自动同步数据库
current.PropertyChanged -= PermissionTreeViewModelPropertyChanged;
current.PropertyChanged += PermissionTreeViewModelPropertyChanged;
}
}
}
_initializePermissionSelected = false;
}
/// <summary>
/// 选择所有子节点。
/// </summary>
/// <param name="currentPermissionTreeViewModel">当前节点模型。</param>
public void ChangeChildNodes(PermissionTreeViewModel currentPermissionTreeViewModel)
{
if (currentPermissionTreeViewModel.Children != null)
{
foreach (var data in currentPermissionTreeViewModel.Children)
{
// 更改子节点的选择属性
data._isSelected = currentPermissionTreeViewModel.IsSelected;
data.RaisePropertyChanged("IsSelected");
if (data.Children != null)
{
// 递归更改子节点的子节点
data.ChangeChildNodes(data);
}
}
}
}
/// <summary>
/// 向上遍历,更改父节点状态。
/// 注意：这里的父节点不是属性而是字段。
/// 采用字段的原因是因为不想让父节点触发访问器而触发Setter。
/// </summary>
/// <param name="currentPermissionTreeViewModel">当前节点。</param>
public void ChangedParentNodes(PermissionTreeViewModel currentPermissionTreeViewModel)
{
if (currentPermissionTreeViewModel.Parent != null)
{
bool parentNodeState = true;
int selectedCount = 0; //被选中的个数
int noSelectedCount = 0; //不被选中的个数
foreach (var data in currentPermissionTreeViewModel.Parent.Children)
{
if (data.IsSelected == true)
{
selectedCount++;
}
else if (data.IsSelected == false)
{
noSelectedCount++;
}
}
//如果全部被选中,则修改父节点为选中
if (selectedCount ==
currentPermissionTreeViewModel.Parent.Children.Count)
{
parentNodeState = true;
}
else
{
parentNodeState = false;
}
currentPermissionTreeViewModel.Parent._isSelected = parentNodeState;
currentPermissionTreeViewModel.Parent.RaisePropertyChanged("IsSelected");
if (currentPermissionTreeViewModel.Parent.Parent != null)
{
ChangedParentNodes(currentPermissionTreeViewModel.Parent);
}
}
}
/// <summary>
/// 递归创建权限树视图模型。
/// </summary>
/// <param name="groupTreeViewModel"></param>
/// <param name="group"></param>
private void Initialize(PermissionTreeViewModel groupTreeViewModel, PermissionGroupData group)
{
group.Children.ForEach(childGroup =>
{
// 如果是组，则需要递归初始化视图模型
var childGroupTreeViewModel = new PermissionTreeViewModel()
{
Text = childGroup.Name, Parent = groupTreeViewModel, Tag = childGroup
};
groupTreeViewModel.Children.Add(childGroupTreeViewModel);
Initialize(childGroupTreeViewModel, childGroup);
});
group.Permissions.ForEach(permission =>
{
// 如果是权限，则已经是叶子节点
var permissionTreeViewModel = new PermissionTreeViewModel()
{
Text = permission.Name, Parent = groupTreeViewModel, Tag = permission
};
groupTreeViewModel.Children.Add(permissionTreeViewModel);
});
}
