Class HistoryManager

Represents to customizes the undo redo functionalities.

Inheritance
System.Object
HistoryManager
Implements
Inherited Members
System.Object.ToString()
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
Namespace: Syncfusion.UI.Xaml.Diagram
Assembly: Syncfusion.SfDiagram.WPF.dll
Syntax
public abstract class HistoryManager : IUndoRedo

Constructors

HistoryManager()

Declaration
protected HistoryManager()

Properties

State

Gets or sets state for UndoRedo.

Declaration
public UndoRedoState State { get; set; }
Property Value
Type Description
UndoRedoState

Methods

BeginComposite(IUndoRedo, Object)

Starts grouping the actions that will be undone/restored as a whole.

Declaration
public void BeginComposite(IUndoRedo source, object data)
Parameters
Type Name Description
IUndoRedo source

The instance of source.
System.Object data

Specified the data(Instance of CompositeTransactions with the TransactionState as start) to log in the Stack.

CanLogData(IUndoRedo, Object)

canLog in the history list, which takes a history entry as argument and returns whether the specific entry can be added or not.

Declaration
public virtual bool CanLogData(IUndoRedo source, object data)
Parameters
Type Name Description
IUndoRedo source

The instance of IUndoRedo.
System.Object data

Specified the data to log in the Stack.
Returns
Type Description
System.Boolean

CanRedo(Object)

Specifies a method to perform redo operation.

Declaration
public bool CanRedo(object data)
Parameters
Type Name Description
System.Object data
Returns
Type Description
System.Boolean

Returns true, when the state as idle in redo operation. Otherwise, false.

CanUndo(Object)

Specifies a method to perform undo operation.

Declaration
public bool CanUndo(object data)
Parameters
Type Name Description
System.Object data
Returns
Type Description
System.Boolean

Returns true, when the state as idle in undo operation. Otherwise, false.

EndComposite(IUndoRedo, Object)

Closes grouping the actions that will be undone/restored as a whole

Declaration
public void EndComposite(IUndoRedo source, object data)
Parameters
Type Name Description
IUndoRedo source

The instance of source.
System.Object data

Specified the data(Instance of CompositeTransactions with the TransactionState as end) to log in the Stack.

LogData(IUndoRedo, Object)

Specifies a method to log the requied data with instance of source to stack for UndoRedo.

Declaration
public void LogData(IUndoRedo source, object data)
Parameters
Type Name Description
IUndoRedo source

The instance of IUndoRedo.
System.Object data

Specified the data to log in the Stack.

Redo(Object)

Specifies a method to invoke when perform redo operation.

Declaration
public abstract object Redo(object data)
Parameters
Type Name Description
System.Object data
Returns
Type Description
System.Object

Undo(Object)

Specifies a method to invoke when perform undo operation.

Declaration
public abstract object Undo(object data)
Parameters
Type Name Description
System.Object data
Returns
Type Description
System.Object

Implements