/// <summary>
/// Create model for FilterControl, if it is possible in current state.
/// </summary>
/// <returns>Instance of FilterControlVm or null.</returns>
protected virtual FilterControlVm CreateModel()
{
FilterControlVm vm = null;
filterPresenter = Parent == null ? null : FilterPresenter.TryGet(ParentCollection);
if (filterPresenter != null)
{
vm = filterPresenter.TryGetFilterControlVm(Key, FilterInitializersManager);
}
return(vm);
}
/// <summary>
/// Initializes the filter view model.
/// </summary>
protected override FilterControlVm CreateModel()
{
FilterControlVm vm = null;
filterPresenter = Parent == null ? null : FilterPresenter.TryGet(ParentCollection);
if (filterPresenter != null)
{
if (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) ?? FilterInitializersManager;
string key = Key ?? GetColumnKey(column);
vm = filterPresenter.TryGetFilterControlVm(key, initializers);
}
else
{
IEnumerable <FilterInitializer> initializers = FilterInitializersManager;
vm = filterPresenter.TryGetFilterControlVm(Key, initializers);
}
if (vm != null)
{
vm.IsEnable = true;
}
}
return(vm);
}