// implement IChangeDataValue for undo/redo
public void ChangeDataValue(ModelChangedEventArgs e, bool undo)
{
switch (e.PropertyName)
{
case "Color": this.Color = (String)e.GetValue(undo); break;
default: throw new NotImplementedException("Socket change: " + e.ToString());
}
}
void model_Changed(object sender, ModelChangedEventArgs e)
{
// add an entry to the log
if (e.Change >= 0)
{
if (ShowChanges.IsChecked == true)
{
myLog.Text += e.ToString() + Environment.NewLine;
myScroller.ScrollToVerticalOffset(9e9);
}
}
else
{
if (ShowLayouts.IsChecked == true ||
(!"Layout".Equals(e.Data) && !"DelayedRouting".Equals(e.Data)))
{
myLog.Text += e.ToString() + Environment.NewLine;
myScroller.ScrollToVerticalOffset(9e9);
}
}
// add an item to the tree view showing the UndoManager state
if (e.Change == ModelChange.CommittedTransaction)
{
UndoManager.CompoundEdit cedit = e.OldValue as UndoManager.CompoundEdit;
if (cedit != null)
{
if (this.EditToRedo != null)
{
// remove from TreeView all transactions starting with this.EditToRedo
ItemCollection coll = myTreeView.Items;
int idx = coll.IndexOf(this.EditToRedo);
if (idx >= 0)
{
while (coll.Count > idx)
{
coll.RemoveAt(idx);
}
}
this.EditToRedo = null;
}
// add a TreeViewItem representing the completed transaction
TreeViewItem citem = new TreeViewItem();
citem.Tag = cedit;
citem.Header = cedit.Name;
// all of the changes within the transaction are tree view children
foreach (IUndoableEdit edit in cedit.Edits)
{
TreeViewItem eitem = new TreeViewItem();
eitem.Tag = edit;
eitem.Header = edit.ToString();
citem.Items.Add(eitem);
}
myTreeView.Items.Add(citem);
#if !SILVERLIGHT
citem.BringIntoView();
#endif
}
}
else if (e.Change == ModelChange.FinishedUndo || e.Change == ModelChange.FinishedRedo)
{
// unselect any currently selected transaction
if (this.EditToRedo != null)
{
this.EditToRedo.IsSelected = false;
this.EditToRedo = null;
}
IUndoableEdit nextedit = myDiagram.Model.UndoManager.EditToRedo;
if (nextedit != null)
{
// find the next edit to redo, and select it
foreach (TreeViewItem item in myTreeView.Items)
{
if (item.Tag == nextedit)
{
item.IsSelected = true;
#if !SILVERLIGHT
item.BringIntoView();
#endif
this.EditToRedo = item;
break;
}
}
}
}
}