private string GetDisplayText(object dataItem)
{
if (BindingEvaluator == null) {
BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
}
if (dataItem == null) {
return string.Empty;
}
if (string.IsNullOrEmpty(DisplayMember)) {
return dataItem.ToString();
}
return BindingEvaluator.Evaluate(dataItem);
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
Editor = Template.FindName(PartEditor, this) as TextBox;
Popup = Template.FindName(PartPopup, this) as Popup;
ItemsSelector = Template.FindName(PartSelector, this) as Selector;
BindingEvaluator = new BindingEvaluator(new Binding(DisplayMember));
if (Editor != null) {
Editor.TextChanged += OnEditorTextChanged;
Editor.PreviewKeyDown += OnEditorKeyDown;
Editor.LostFocus += OnEditorLostFocus;
if (SelectedItem != null) {
Editor.Text = BindingEvaluator.Evaluate(SelectedItem);
}
}
if (Popup != null) {
Popup.StaysOpen = false;
Popup.Opened += OnPopupOpened;
Popup.Closed += OnPopupClosed;
}
if (ItemsSelector != null) {
SelectionAdapter = new SelectionAdapter(ItemsSelector);
SelectionAdapter.Commit += OnSelectionAdapterCommit;
SelectionAdapter.Cancel += OnSelectionAdapterCancel;
SelectionAdapter.SelectionChanged += OnSelectionAdapterSelectionChanged;
}
}