private static void UndoSequentially(Dictionary <UndoableTaskBase <T>, T> taskDictionary)
{
foreach (KeyValuePair <UndoableTaskBase <T>, T> current in taskDictionary)
{
IUndoableTask key = current.Key;
key.Undo();
}
}
public TaskResult Undo(object ownerKey = null)
{
if (ownerKey == null)
{
return(this.Undo());
}
TaskService.TaskCollection <IUndoableTask> taskCollection1;
if (!this.undoableDictionary.TryGetValue(ownerKey, out taskCollection1))
{
throw new InvalidOperationException("No undoable tasks for the specified owner key.");
}
IUndoableTask undoableTask = taskCollection1.Pop();
TaskService.TaskCollection <IInternalTask> taskCollection2;
if (!this.repeatableDictionary.TryGetValue(ownerKey, out taskCollection2))
{
throw new InvalidOperationException("No repeatable tasks for the specified owner key.");
}
taskCollection2.RemoveLast();
CancellableTaskServiceEventArgs e = new CancellableTaskServiceEventArgs((ITask)undoableTask)
{
OwnerKey = ownerKey
};
this.OnUndoing(e);
if (e.Cancel)
{
taskCollection1.AddLast(undoableTask);
return(TaskResult.Cancelled);
}
TaskService.TaskCollection <IUndoableTask> taskCollection3;
if (!this.redoableDictionary.TryGetValue(ownerKey, out taskCollection3))
{
taskCollection3 = new TaskService.TaskCollection <IUndoableTask>();
this.redoableDictionary[ownerKey] = taskCollection3;
}
taskCollection3.AddLast(undoableTask);
TaskResult taskResult = undoableTask.Undo();
this.TrimIfRequired(ownerKey);
this.OnUndone(new TaskServiceEventArgs((ITask)undoableTask));
return(taskResult);
}
private TaskResult Undo()
{
if (this.globallyRepeatableTasks.Count < 1)
{
throw new InvalidOperationException("No task to undo.");
}
IUndoableTask undoableTask = this.globallyUndoableTasks.Pop();
IInternalTask internalTask = this.globallyRepeatableTasks.Pop();
CancellableTaskServiceEventArgs e = new CancellableTaskServiceEventArgs((ITask)undoableTask);
this.OnUndoing(e);
if (e.Cancel)
{
this.globallyUndoableTasks.AddLast(undoableTask);
this.globallyRepeatableTasks.AddLast(internalTask);
return(TaskResult.Cancelled);
}
this.globallyRedoableTasks.AddLast(undoableTask);
TaskResult taskResult = undoableTask.Undo();
this.OnUndone(new TaskServiceEventArgs((ITask)undoableTask));
return(taskResult);
}
