ChangeItemCmd Class

Handles undo / redo of programmatic property changes.

Namespace: MindFusion.Diagramming.Commands
Package: MindFusion.Diagramming

 Syntax

C#

public class ChangeItemCmd : Command

Visual Basic

Public Class ChangeItemCmd
    Inherits Command

 Remarks

You would create an instance of this class in order to enable undo / redo of changes to item's properties. The constructor records the initial state of the item and the Execute method records the final state and adds the ChangeItemCmd object to the undo manager's history.

 Example

C#

// Save item state
ChangeItemCmd propChange = new ChangeItemCmd(diagram.Nodes[0], "Change");

// Change properties
ShapeNode shape = (ShapeNode)diagram.Nodes[0];
shape.Text = "new text";
shape.Brush = new SolidBrush(Color.Blue);
shape.Shape = Shape.FromId("Ellipse");

// Add to history
propChange.Execute();

Visual Basic

' Save item state
Dim propChange As ChangeItemCmd = New ChangeItemCmd(Diagram.Nodes(0), "Change")

' Change properties
Dim shape As ShapeNode = CType(Diagram.Nodes(0), ShapeNode)
Shape.Text = "new text"
Shape.Brush = New SolidBrush(Color.Blue)
shape.Shape = MindFusion.Diagramming.Shape.FromId("Ellipse")

' Add to history
propChange.Execute()

 Inheritance Hierarchy

System.Object
    MindFusion.Diagramming.Commands.Command
        MindFusion.Diagramming.Commands.ChangeItemCmd