protected override void ExecuteAction(ObjectBuilderContext context, BaseItemAction action, dynamic metadata)
{
ViewHelper.ShowView(null,
() => context.Build(action.GetView(), metadata.View),
childDataSource => OnInitializeChildView(childDataSource),
childDataSource => OnAcceptedChildView(action, childDataSource));
}
private static void OnAcceptedChildView(BaseItemAction action, IDataSource childDataSource, dynamic selectedItem)
{
var newItem = childDataSource.GetSelectedItem();
if (newItem != null)
{
action.ReplaceItem(selectedItem, newItem);
action.SetSelectedItem(newItem);
}
}
private static void OnAcceptedChildView(BaseItemAction action, IDataSource childDataSource)
{
var newItem = childDataSource.GetSelectedItem();
if (newItem != null)
{
action.AddItem(newItem);
action.SetSelectedItem(newItem);
}
}
protected override void ExecuteAction(ObjectBuilderContext context, BaseItemAction action, dynamic metadata)
{
var selectedItem = action.GetSelectedItem();
if (selectedItem != null)
{
ViewHelper.ShowView(selectedItem,
() => context.Build(action.GetView(), metadata.View),
childDataSource => OnInitializeChildView(childDataSource, selectedItem),
childDataSource => OnAcceptedChildView(action, childDataSource, selectedItem));
}
}
protected override void ExecuteAction(ObjectBuilderContext context, BaseItemAction action, dynamic metadata)
{
var selectedItem = action.GetSelectedItem();
if (selectedItem != null && (Convert.ToBoolean(metadata.Accept) == false
||
MessageBox.Show(Resources.DeleteItemActionQuestion, action.GetView().GetText(),
MessageBoxButton.YesNo, MessageBoxImage.Question,
MessageBoxResult.No) == MessageBoxResult.Yes))
{
action.RemoveItem(selectedItem);
}
}
public object Build(ObjectBuilderContext context, View parent, dynamic metadata)
{
var action = new BaseItemAction(parent);
IElementDataBinding itemsDataBinding = context.Build(parent, metadata.Items);
if (itemsDataBinding != null)
{
itemsDataBinding.OnPropertyValueChanged += (c, a) => action.SetItems(a.Value);
action.OnValueChanged += (c, a) => itemsDataBinding.SetPropertyValue(a.Value);
var sourceItemsDataBinding = itemsDataBinding as ISourceDataBinding;
if (sourceItemsDataBinding != null)
{
var dataSourceName = sourceItemsDataBinding.GetDataSource();
var propertyName = sourceItemsDataBinding.GetProperty();
// Публикация сообщений в шину при возникновении событий
action.NotifyWhenEventAsync(i => i.OnSetSelectedItem, a =>
{
a.DataSource = dataSourceName;
a.Property = propertyName;
return(true);
});
// Подписка на сообщения шины от внешних элементов
action.SubscribeOnEvent(OnSetSelectedItem, a => a.DataSource == dataSourceName &&
a.Property == propertyName);
}
}
action.SetAction(() => ExecuteAction(context, action, metadata));
return(action);
}
// Обработчики сообщений шины (внимание: наименования обработчиков совпадают с наименованиями событий)
private static void OnSetSelectedItem(BaseItemAction target, dynamic arguments)
{
target.SetSelectedItem(arguments.Value);
}
protected abstract void ExecuteAction(ObjectBuilderContext context, BaseItemAction action, dynamic metadata);