private void UpdatePreview()
{
if (_previewChild != null)
{
_previewChild.PropertyChanged -= PreviewPropertyChanged;
}
if (_children.Count == 0)
{
Icon = null;
OnPropertyChanged("Icon");
return;
}
_previewChild = _children.First();
_previewChild.PropertyChanged += PreviewPropertyChanged;
if (IsSelected)
{
Icon = null;
OnPropertyChanged("Icon");
}
else
{
Icon = _previewChild.Icon;
OnPropertyChanged("Icon");
}
}
protected void OnSelectionChanged(AppTreeNode sender)
{
if (SelectionChanged != null)
{
SelectionChanged(sender);
}
}
public void AddChild(AppTreeNode item)
{
item.SelectionChanged += OnSelectionChanged;
item.Parent = this;
_children.Add(item);
if (_enablePreview)
{
UpdatePreview();
}
}
public bool RemoveChild(AppTreeNode item)
{
item.SelectionChanged -= OnSelectionChanged;
item.Parent = null;
var result = _children.Remove(item);
if (_enablePreview)
{
UpdatePreview();
}
return(result);
}