public void Dispose()
{
if (this.owner != null)
{
this.owner.ClearCachedHashCode();
this.owner = null;
}
}
internal ChangeScope(ReferenceValue owner)
{
Validate.IsNotNull <ReferenceValue>(owner, "owner");
this.owner = owner;
}
private void StepBackwardImpl(IWin32Window owner)
{
HistoryMemento historyMemento = this.undoStack[this.undoStack.Count - 1];
ToolHistoryMemento memento2 = historyMemento as ToolHistoryMemento;
if ((memento2 != null) && (memento2.ToolType != this.documentWorkspace.GetToolType()))
{
this.documentWorkspace.SetToolFromType(memento2.ToolType);
this.StepBackwardImpl(owner);
}
else
{
this.OnChanging();
ExecutingHistoryMementoEventArgs e = new ExecutingHistoryMementoEventArgs(historyMemento, true, false);
if ((memento2 == null) && (historyMemento.SeriesGuid == Guid.Empty))
{
e.SuspendTool = true;
}
this.OnExecutingHistoryMemento(e);
ReferenceValue changes = null;
System.Type type = null;
if (e.SuspendTool)
{
TransactedTool tool = this.documentWorkspace.Tool as TransactedTool;
if (tool != null)
{
type = tool.GetType();
tool.ForceCancelDrawingOrEditing();
if (tool.State == TransactedToolState.Dirty)
{
changes = tool.Changes;
tool.CancelChanges();
}
}
this.documentWorkspace.PushNullTool();
}
HistoryMemento memento3 = this.undoStack[this.undoStack.Count - 1];
ExecutingHistoryMementoEventArgs args2 = new ExecutingHistoryMementoEventArgs(memento3, false, e.SuspendTool);
this.OnExecutingHistoryMemento(args2);
using (this.disallowPushNewMementoRegion.UseEnterScope())
{
HistoryMemento item = this.undoStack[this.undoStack.Count - 1].PerformUndo(null);
this.undoStack.RemoveAt(this.undoStack.Count - 1);
this.redoStack.Insert(0, item);
ExecutedHistoryMementoEventArgs args3 = new ExecutedHistoryMementoEventArgs(item);
this.OnExecutedHistoryMemento(args3);
this.OnChanged();
this.OnSteppedBackward();
item.Flush();
}
if (e.SuspendTool)
{
this.documentWorkspace.PopNullTool();
if (changes != null)
{
((TransactedTool)this.documentWorkspace.Tool).RestoreChanges(changes);
}
}
}
if (this.stepGroupDepth == 0)
{
this.OnFinishedStepGroup();
}
}