public override object GetUndoDiff()
{
XmlElement oldElem = UndoManager.GetObjectStatus(this);
UndoWriter writer = new UndoWriter(oldElem.OwnerDocument, UndoManager);
XmlElement newElem = Write(writer);
ObjectDiff actionsDiff = GetDiffGenerator().GetDiff(this, oldElem);
UndoManager.UpdateObjectStatus(this, newElem);
return(actionsDiff);
}
public override object ApplyUndoRedoDiff(object diff)
{
ObjectDiff actionsDiff = (ObjectDiff)diff;
XmlElement status = UndoManager.GetObjectStatus(this);
DiffGenerator differ = GetDiffGenerator();
differ.ApplyDiff(this, actionsDiff);
actionsDiff = differ.GetDiff(this, status);
UndoWriter writer = new UndoWriter(status.OwnerDocument, UndoManager);
XmlElement newElem = Write(writer);
UndoManager.UpdateObjectStatus(this, newElem);
return(actionsDiff);
}
public override object ApplyUndoRedoDiff (object diff)
{
ObjectDiff actionsDiff = (ObjectDiff) diff;
XmlElement status = UndoManager.GetObjectStatus (this);
DiffGenerator differ = GetDiffGenerator();
differ.ApplyDiff (this, actionsDiff);
actionsDiff = differ.GetDiff (this, status);
UndoWriter writer = new UndoWriter (status.OwnerDocument, UndoManager);
XmlElement newElem = Write (writer);
UndoManager.UpdateObjectStatus (this, newElem);
return actionsDiff;
}
public override object GetUndoDiff ()
{
XmlElement oldElem = UndoManager.GetObjectStatus (this);
UndoWriter writer = new UndoWriter (oldElem.OwnerDocument, UndoManager);
XmlElement newElem = Write (writer);
ObjectDiff actionsDiff = GetDiffGenerator().GetDiff (this, oldElem);
UndoManager.UpdateObjectStatus (this, newElem);
return actionsDiff;
}
public override object ApplyUndoRedoDiff (object data)
{
ObjectDiff diff = ((ObjectDiff[]) data)[0];
ObjectDiff actionsDiff = ((ObjectDiff[]) data)[1];
ObjectDiff reverseDiff = null;
ObjectDiff reverseActionsDiff = null;
XmlElement status = UndoManager.GetObjectStatus (this);
XmlElement oldStatus = (XmlElement) status.CloneNode (true);
UndoReader reader = new UndoReader (Project, FileFormat.Native, UndoManager);
// Only apply the actions diff if the widget has not been completely reloaded
if (actionsDiff != null && !(diff != null && diff.ChildChanges != null)) {
// Apply the patch
LocalActionGroups.ApplyDiff (Project, actionsDiff);
// Get the redo patch
reverseActionsDiff = LocalActionGroups.GetDiff (Project, oldStatus);
// Update the status of the action group list in the undo status tree.
// It has to remove all action groups and then write them again
foreach (XmlElement group in status.SelectNodes ("action-group"))
status.RemoveChild (group);
UndoWriter writer = new UndoWriter (status.OwnerDocument, UndoManager);
foreach (ActionGroup actionGroup in LocalActionGroups)
status.InsertBefore (actionGroup.Write (writer), status.FirstChild);
}
if (diff != null) {
containerDiffGenerator.ApplyDiff (status, diff);
reverseDiff = containerDiffGenerator.GetDiff (status, oldStatus);
// Avoid reading the whole widget tree if only the properties have changed.
if (diff.ChildChanges == null) {
ReadProperties (reader, status);
} else {
// Console.WriteLine ("BEFORE PATCH: " + status.OuterXml);
Read (reader, status);
// Console.WriteLine ("\nAFTER PATCH:");
// UndoManager.Dump ();
EmitContentsChanged ();
}
}
if (reverseDiff != null || reverseActionsDiff != null)
return new ObjectDiff[] { reverseDiff, reverseActionsDiff };
else
return null;
}
public override object GetUndoDiff ()
{
XmlElement oldElem = UndoManager.GetObjectStatus (this);
// Console.WriteLine ("UNDO status: ");
// Console.WriteLine (oldElem.OuterXml);
// Write the new status of the object. This is going to replace the old status in undoManager.
// In the process, register new objects found.
UndoWriter writer = new UndoWriter (oldElem.OwnerDocument, UndoManager);
XmlElement newElem = Write (writer);
// Console.WriteLine ("CURRENT status: ");
// Console.WriteLine (newElem.OuterXml);
// Get the changes since the last undo checkpoint
ObjectDiff actionsDiff = null;
ObjectDiff objectDiff = containerDiffGenerator.GetDiff (newElem, oldElem);
// If there are child changes there is no need to look for changes in the
// actions, since the whole widget will be read again
if (IsTopLevel && (objectDiff == null || objectDiff.ChildChanges == null))
actionsDiff = LocalActionGroups.GetDiff (Project, oldElem);
// The undo writer skips children which are already registered in the undo manager
// to avoid writing information we already have. Now it's the moment to fill the gaps
foreach (XmlElement newChild in newElem.SelectNodes ("child[widget/@unchanged_marker='yes']")) {
string cid = newChild.GetAttribute ("undoId");
XmlElement oldChild = (XmlElement) oldElem.SelectSingleNode ("child[@undoId='" + cid + "']");
if (oldChild == null)
throw new InvalidOperationException ("Child not found when filling widget info gaps.");
XmlElement oldWidgetChild = oldChild ["widget"];
XmlElement newWidgetChild = newChild ["widget"];
oldChild.RemoveChild (oldWidgetChild);
if (newWidgetChild != null)
newChild.ReplaceChild (oldWidgetChild, newWidgetChild);
}
// Update the status tree
UndoManager.UpdateObjectStatus (this, newElem);
// UndoManager.Dump ();
if (objectDiff != null || actionsDiff != null)
return new ObjectDiff[] { objectDiff, actionsDiff };
else
return null;
}
