Undo Redo Commands in WPF SfDiagram
18 Nov 20181 minute to read
The Undo command reverses the last editing action performed. For example, some of the basic operations performed on diagram objects such as translation, rotation, resizing, grouping, ungrouping, changing z-order, addition, deletion, and so on, can be reversed. The Redo command restores the last editing action if no other actions have occurred since the last undo.
Undo and Redo actions are disabled by default, to enable this you can use the Constraints property of the SfDiagram. Please refer to the GraphConstraints.
NOTE
Undo and Redo commands are available only when the
GraphConstraints.Undoableconstraint is enabled on theSfDiagram. Ensure that this constraint is set before executing the Undo or Redo commands.
<Syncfusion:SfDiagram x:Name="diagramcontrol" Constraints="Default,Undoable"/>
<Button Height="50" Content="Undo" Name="Undo" Command="Syncfusion:DiagramCommands.Undo"></Button>
<Button Height="50" Content="Redo" Name="Redo" Command="Syncfusion:DiagramCommands.Redo"></Button>//Initialize the SfDiagram
SfDiagram diagramcontrol = new SfDiagram();
// To enable the Undo and Redo action
diagramcontrol.Constraints |= GraphConstraints.Undoable;
IGraphInfo graphinfo = diagramcontrol.Info as IGraphInfo;
// To perform the Undo action in Diagram
graphinfo.Commands.Undo.Execute(null);
// To Perform the Redo action in Diagram
graphinfo.Commands.Redo.Execute(null);NOTE
The Undo command reverses the most recent tracked action in the diagram. If there are no actions available in the undo stack, the command will not perform any operation.
NOTE
The Redo command restores the most recently undone action. If there are no actions available in the redo stack, the command will not perform any operation.
