private void DoUndoEdit(UndoOperation operation)
{
if (operation.lines != null)
{
foreach (Line lineOld in operation.lines)
{
lineOld.startNode = this.diagram.GetNodeByID(lineOld.start);
lineOld.endNode = this.diagram.GetNodeByID(lineOld.end);
Line line = this.diagram.layers.GetLine(lineOld.startNode, lineOld.endNode);
if (line != null)
{
line.Set(lineOld);
}
}
}
if (operation.nodes != null)
{
foreach (Node nodeOld in operation.nodes)
{
Node node = this.diagram.layers.GetNode(nodeOld.id);
if (node != null)
{
node.Set(nodeOld);
}
}
}
}
/// <summary>
/// Check if operation is same as previous operation
/// If previous operation is move node (by arrow forexample) is better group operation like one big move instead of many small moves.
/// </summary>
public bool IsSame(string type, Nodes nodes, Lines lines)
{
if (operations.Count() > 0)
{
UndoOperation operation = operations.First();
if (operation.type == type)
{
if (operation.nodes.Count() == 0 && nodes == null)
{
}
else if ((operation.nodes == null && nodes != null) || (operation.nodes != null && nodes == null))
{
return(false);
}
else if (operation.nodes.Count() == nodes.Count())
{
for (int i = 0; i < nodes.Count(); i++)
{
if (operation.nodes[i].id != nodes[i].id)
{
return(false);
}
}
}
else
{
return(false);
}
if (operation.lines.Count() == 0 && lines == null)
{
}
else if ((operation.lines == null && lines != null) || (operation.lines != null && lines == null))
{
return(false);
}
else if (operation.lines.Count() == lines.Count())
{
for (int i = 0; i < lines.Count(); i++)
{
if (operation.lines[i].start != lines[i].start || operation.lines[i].end != lines[i].end)
{
return(false);
}
}
}
else
{
return(false);
}
return(true);
}
}
return(false);
}
private void DoUndoCreate(UndoOperation operation)
{
if (operation.lines != null)
{
foreach (Line line in operation.lines)
{
this.diagram.layers.RemoveLine(line.start, line.end);
}
}
if (operation.nodes != null)
{
foreach (Node node in operation.nodes)
{
this.diagram.layers.RemoveNode(node.id);
}
}
}
/*************************************************************************************************************************/
// EVERSE OPERATION BY TYPE
private void DoUndoDelete(UndoOperation operation)
{
if (operation.nodes != null)
{
foreach (Node node in operation.nodes)
{
this.diagram.layers.AddNode(node);
}
}
if (operation.lines != null)
{
foreach (Line line in operation.lines)
{
line.startNode = this.diagram.GetNodeByID(line.start);
line.endNode = this.diagram.GetNodeByID(line.end);
this.diagram.layers.AddLine(line);
}
}
}
public bool DoRedo(DiagramView view = null)
{
if (reverseOperations.Count() == 0)
{
return(false);
}
long group = 0;
bool result = false;
do
{
UndoOperation operation = reverseOperations.First();
// first restore position where change occurred
if (view != null && !view.IsOnPosition(operation.position, operation.scale, operation.layer))
{
view.GoToPosition(operation.position, operation.scale, operation.layer);
view.Invalidate();
return(false);
}
// process all operations in same group
if (group != 0 && operation.group != group)
{
group = 0;
break;
}
group = operation.group;
if (operation.type == "delete")
{
this.DoUndoCreate(operation);
operations.Push(operation);
}
if (operation.type == "create")
{
this.DoUndoDelete(operation);
operations.Push(operation);
}
if (operation.type == "edit" ||
operation.type == "move" ||
operation.type == "changeLineColor" ||
operation.type == "changeLineWidth" ||
operation.type == "changeNodeColor"
)
{
Nodes nodes = new Nodes();
foreach (Node node in operation.nodes)
{
nodes.Add(this.diagram.GetNodeByID(node.id));
}
Lines lines = new Lines();
foreach (Line line in operation.lines)
{
lines.Add(this.diagram.GetLine(line.start, line.end));
}
UndoOperation roperation = new UndoOperation(
operation.type,
nodes,
lines,
operation.group,
operation.position,
operation.scale,
operation.layer
);
operations.Push(roperation);
this.DoUndoEdit(operation);
}
reverseOperations.Pop();
result = true;
} while (group != 0 && reverseOperations.Count() > 0);
if (result)
{
this.saved++;
if (!this.saveLost && this.saved == 0)
{
this.diagram.Restoresave();
}
else
{
this.diagram.Unsave();
}
}
return(result);
}
private void doUndoEdit(UndoOperation operation)
{
if (operation.lines != null)
{
foreach (Line lineOld in operation.lines)
{
lineOld.startNode = this.diagram.GetNodeByID(lineOld.start);
lineOld.endNode = this.diagram.GetNodeByID(lineOld.end);
Line line = this.diagram.layers.getLine(lineOld.startNode, lineOld.endNode);
if (line != null)
{
line.set(lineOld);
}
}
}
if (operation.nodes != null)
{
foreach (Node nodeOld in operation.nodes)
{
Node node = this.diagram.layers.getNode(nodeOld.id);
if (node != null)
{
node.set(nodeOld);
}
}
}
}
/*************************************************************************************************************************/
// EVERSE OPERATION BY TYPE
private void doUndoDelete(UndoOperation operation)
{
if (operation.nodes != null)
{
foreach (Node node in operation.nodes)
{
this.diagram.layers.addNode(node);
}
}
if (operation.lines != null)
{
foreach (Line line in operation.lines)
{
line.startNode = this.diagram.GetNodeByID(line.start);
line.endNode = this.diagram.GetNodeByID(line.end);
this.diagram.layers.addLine(line);
}
}
}
private void doUndoCreate(UndoOperation operation)
{
if (operation.lines != null)
{
foreach (Line line in operation.lines)
{
this.diagram.layers.removeLine(line.start, line.end);
}
}
if (operation.nodes != null)
{
foreach (Node node in operation.nodes)
{
this.diagram.layers.removeNode(node.id);
}
}
}
public bool doUndo(DiagramView view = null)
{
if (operations.Count() == 0)
{
return false;
}
int group = 0;
bool result = false;
do
{
UndoOperation operation = operations.First();
// first restore position where change occurred
if (view != null && !view.isOnPosition(operation.position, operation.layer))
{
view.goToShift(operation.position);
view.goToLayer(operation.layer);
view.Invalidate();
return false;
}
// process all operations in same group
if (group != 0 && operation.group != group)
{
group = 0;
break;
}
group = operation.group;
if (operation.type == "delete")
{
this.doUndoDelete(operation);
reverseOperations.Push(operation);
}
if (operation.type == "create")
{
this.doUndoCreate(operation);
reverseOperations.Push(operation);
}
if (operation.type == "edit" ||
operation.type == "move" ||
operation.type == "changeLineColor" ||
operation.type == "changeLineWidth" ||
operation.type == "changeNodeColor"
)
{
Nodes nodes = new Nodes();
foreach (Node node in operation.nodes)
{
nodes.Add(this.diagram.GetNodeByID(node.id));
}
Lines lines = new Lines();
foreach (Line line in operation.lines)
{
lines.Add(this.diagram.getLine(line.start, line.end));
}
UndoOperation roperation = new UndoOperation(
operation.type,
nodes,
lines,
operation.group,
operation.position,
operation.layer
);
reverseOperations.Push(roperation);
this.doUndoEdit(operation);
}
operations.Pop();
result = true;
} while (group != 0 && operations.Count() > 0);
if (result)
{
this.saved--;
if (!this.saveLost && this.saved == 0)
{
this.diagram.restoresave();
}
else
{
this.diagram.unsave();
}
}
return result;
}