private static PropertyChangedCallback CreateTemplatePropertyChangedCallback(ComboBoxPopupPlacement popupPlacement)
{
return(delegate(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var popup = d as ComboBoxPopup;
if (popup == null)
{
return;
}
var template = e.NewValue as ControlTemplate;
if (template == null)
{
return;
}
if (popup.PopupPlacement == popupPlacement)
{
popup.SetChildTemplateIfNeed(template);
}
});
}
private void UpdateChildTemplate(ComboBoxPopupPlacement placement)
{
switch (placement)
{
case ComboBoxPopupPlacement.Classic:
SetChildTemplateIfNeed(ClassicContentTemplate);
break;
case ComboBoxPopupPlacement.Down:
SetChildTemplateIfNeed(DownContentTemplate);
break;
case ComboBoxPopupPlacement.Up:
SetChildTemplateIfNeed(UpContentTemplate);
break;
// default:
// throw new NotImplementedException($"Unexpected value {placement} of the {nameof(PopupPlacement)} property inside the {nameof(ComboBoxPopup)} control.");
}
}
private static PropertyChangedCallback CreateTemplatePropertyChangedCallback(ComboBoxPopupPlacement popupPlacement)
{
return delegate (DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var popup = d as ComboBoxPopup;
if (popup == null) return;
var template = e.NewValue as ControlTemplate;
if (template == null) return;
if (popup.PopupPlacement == popupPlacement)
{
popup.SetChildTemplateIfNeed(template);
}
};
}
