/// <summary>
/// Set a new <paramref name="model"/> to be displayed in the <see
/// cref="ListView"/>.
/// </summary>
public void SetModel(TreeListViewModel <TNode> model)
{
_listView.BeginUpdate();
try {
_currentModel = model;
UpdateListView();
} finally {
_listView.EndUpdate();
}
}
public bool IsExpanded(TreeListViewModel <TNode> model, TNode node, string path)
{
bool savedState;
if (_expandedStates.TryGetValue(path, out savedState))
{
return(savedState);
}
return(model.IsNodeExpanded(node));
}
private static string MakeNodePath(TreeListViewModel <TNode> model, string path, TNode node)
{
var text = model.GetNodePathComponent(node).Replace('\\', '-');
if (string.IsNullOrEmpty(path))
{
return(text);
}
return(path + "\\" + text);
}
/// <summary>
/// Create all list view items corresponding to all the properties and property groups
/// that should be displayed in the list view. Children of property groups that are not
/// expanded are skipped -- they will be created when the groups are expanded.
/// </summary>
private List <ListViewItem> CreateListViewItems(TreeListViewModel <TNode> model, ExpandedNodeState expandedNodeState)
{
var itemList = new List <ListViewItem>();
if (model == null)
{
return(itemList);
}
if (model.IsRootVisible())
{
CreateListViewItem(itemList, expandedNodeState, "", 0, model, model.GetRootNode());
}
else
{
Enumerable.Range(0, model.GetChildCount(model.GetRootNode())).ForEach(index => {
CreateListViewItem(itemList, expandedNodeState, "", 0, model, model.GetChildAt(model.GetRootNode(), index));
});
}
return(itemList);
}
private void CreateListViewItem(List <ListViewItem> itemList, ExpandedNodeState expandedNodeState, string parentPath, int indent, TreeListViewModel <TNode> model, TNode node)
{
var propertyNodePath = MakeNodePath(model, parentPath, node);
var item = new ListViewItem();
itemList.Add(item); // Add the item before (optional) recursive call
// Add sub-properties recursively (if group)
if (model.IsNodeExpandable(node))
{
var isExpanded = expandedNodeState.IsExpanded(model, node, propertyNodePath);
item.ImageIndex = isExpanded ? 1 : 0;
if (isExpanded)
{
Enumerable.Range(0, model.GetChildCount(node)).ForEach(index => {
CreateListViewItem(itemList, expandedNodeState, propertyNodePath, indent + 1, model, model.GetChildAt(node, index));
});
}
}
// Setup final item properties after recursion, in case property node
// value, for example, was changed as a side effect of the recursive call.
item.Text = model.GetNodeText(node);
var subItemCount = model.GetNodeSubItemCount(node);
for (var subItem = 0; subItem < subItemCount; subItem++)
{
item.SubItems.Add(model.GetNodeSubItemAt(node, subItem));
}
item.Tag = new ListViewItemTag(node, propertyNodePath);
item.IndentCount = indent;
}
/// <summary>
/// Remove the current <see cref="TreeNodeCollection"/> and remove all entries
/// displayed in the <see cref="ListView"/>.
/// </summary>
public void Clear()
{
_listView.Items.Clear();
_currentModel = null;
}