/// <summary>
/// Initializes the filter view model.
/// </summary>
protected override FilterControlVm CreateViewModel()
{
FilterControlVm vm = null;
this.filterPresenter = this.Parent == null ? null : FiltersManager.TryGetFilterPresenter(this.ParentCollection);
if (this.filterPresenter != null)
{
if (this.Key == null)
{
DataGridColumnHeader columnHeader = this.GetParent <DataGridColumnHeader>();
if (columnHeader == null)
{
return(null);
}
DataGridColumn column = columnHeader.Column;
if (column == null)
{
return(null);
}
DataGrid dataGrid = columnHeader.GetParent <DataGrid>();
if (dataGrid == null)
{
return(null);
}
if (column.DisplayIndex >= dataGrid.Columns.Count)
{
return(null);
}
IEnumerable <FilterInitializer> initializers = GetInitializers(column) ?? this.FilterInitializersManager;
string key = this.Key ?? this.GetColumnKey(column);
vm = this.filterPresenter.TryGetFilterControlVm(key, initializers);
}
else
{
IEnumerable <FilterInitializer> initializers = this.FilterInitializersManager;
vm = this.filterPresenter.TryGetFilterControlVm(this.Key, initializers);
}
if (vm != null)
{
vm.IsEnable = true;
}
}
return(vm);
}