internal void AddItem(RadzenTreeItem item)
{
if (items.IndexOf(item) == -1)
{
items.Add(item);
}
}
internal void RemoveItem(RadzenTreeItem item)
{
if (items.IndexOf(item) != -1)
{
items.Remove(item);
}
}
internal async Task ExpandItem(RadzenTreeItem item)
{
var args = new TreeExpandEventArgs()
{
Text = item?.Text,
Value = item?.Value,
Children = new TreeItemSettings()
};
await Expand.InvokeAsync(args);
if (args.Children.Data != null)
{
var childContent = new RenderFragment(builder =>
{
Func <object, string> text = null;
var children = args.Children;
foreach (var data in children.Data)
{
if (text == null)
{
text = children.Text ?? Getter <string>(data, children.TextProperty);
}
RenderTreeItem(builder, data, children.Template, text, children.HasChildren, children.Expanded, children.Selected);
builder.CloseComponent();
}
});
item.RenderChildContent(childContent);
if (AllowCheckBoxes && AllowCheckChildren && args.Children.Data != null)
{
if (CheckedValues != null && CheckedValues.Contains(item.Value))
{
await SetCheckedValues(CheckedValues.Union(args.Children.Data.Cast <object>().Except(UncheckedValues)));
}
else
{
await SetCheckedValues(CheckedValues.Except(args.Children.Data.Cast <object>()));
}
}
}
else if (item.Data != null)
{
if (AllowCheckBoxes && AllowCheckChildren && item.Data != null)
{
if (CheckedValues != null && CheckedValues.Contains(item.Value))
{
await SetCheckedValues(CheckedValues.Union(item.Data.Cast <object>().Except(UncheckedValues)));
}
else
{
await SetCheckedValues(CheckedValues);
}
}
}
}
internal bool Contains(RadzenTreeItem child)
{
var parent = child.ParentItem;
while (parent != null)
{
if (parent == this)
{
return(true);
}
parent = parent.ParentItem;
}
return(false);
}
internal async Task SelectItem(RadzenTreeItem item)
{
var selectedItem = SelectedItem;
if (selectedItem != item)
{
SelectedItem = item;
selectedItem?.Unselect();
if (Value != item.Value)
{
await ValueChanged.InvokeAsync(item.Value);
}
await Change.InvokeAsync(new TreeEventArgs()
{
Text = item?.Text,
Value = item?.Value
});
}
}