public void Delete(bool deleteConversations)
{
// Contains the same references as in SelectedMessages,
// these references can change when un-doing so keep a snapshot around
var previousSelection = deleteConversations ?
SelectedMessages.SelectMany(m => m.Conversation.Messages)
.Distinct() // Select all messages from selected conversations
.ToList()
: new List <Message>(SelectedMessages);
// Contains instance copies of messages, this will be the old data
// before the do is applied.
var messagesCopy = previousSelection
.Select(m => m.DuckCopy <Message>())
.ToList();
#region Do action
Action doAction = delegate
{
foreach (var message in previousSelection)
{
message.MarkDeleted();
}
viewFilter.UpdateCurrentViewAsync();
flipper.Delay();
};
#endregion
#region Undo action
Action undoAction = delegate
{
foreach (var message in previousSelection)
{
// Get old message from copied data
Message message1 = message;
var oldMessage = messagesCopy.Single(m => m.MessageId == message1.MessageId);
message.IsRead = oldMessage.IsRead;
message.TargetMessageState = oldMessage.TargetMessageState;
message.MessageFolder = oldMessage.MessageFolder;
AsyncUpdateQueue.Enqueue(message);
}
// We cannot use the IEditableObject appraoch here because the conversation in question
// probably might not be in view anymore. So instead we will refresh the whole view.
viewFilter.RebuildCurrentViewAsync();
};
#endregion
ClientState.Current.UndoManager.Execute(new HistoryAction(doAction, undoAction));
}
