Class CommandManager<T>

Executes IUndoCommands for editing a specific object and allows undo/redo operations.

Inheritance
Object
CommandManager<T>
Namespace: NanoByte.Common.Undo
Assembly: NanoByte.Common.dll
Syntax
public class CommandManager<T> : Object, ICommandManager<T>, ICommandExecutor where T : class
Type Parameters
Name Description
T

The type of the object being edited.

Constructors

CommandManager(T, String)

Creates a new command manager.

Declaration
public CommandManager(T target, string path = null)
Parameters
Type Name Description
T target

The object being edited.
String path

The path of the file the target was loaded from. null if none.

Properties

Path

The path of the file the Target was loaded from. null if none.

Declaration
public string Path { get; set; }
Property Value
Type Description
String

RedoEnabled

Indicates whether there currently are operations that can be Redo()ne.

Declaration
public bool RedoEnabled { get; }
Property Value
Type Description
Boolean

Target

The object being edited.

Declaration
public T Target { get; set; }
Property Value
Type Description
T

UndoEnabled

Indicates whether there currently are operations that can be Undo()ne.

Declaration
public bool UndoEnabled { get; }
Property Value
Type Description
Boolean
Remarks

This can also be used as an indicator for unsaved changes.

Methods

ClearUndo()

Clears the undo/redo stacks.

Declaration
protected void ClearUndo()

Execute(IUndoCommand)

Executes an IUndoCommand and stores it for later undo-operations.

Declaration
public void Execute(IUndoCommand command)
Parameters
Type Name Description
IUndoCommand command

The command to be executed.

Load(String)

Loads an object from an XML file.

Declaration
public static CommandManager<T> Load(string path)
Parameters
Type Name Description
String path

The file to load from.
Returns
Type Description
CommandManager<T>

An ICommandManager<T> containing the loaded object.
Exceptions
Type Condition
IOException

A problem occurs while reading the file.
UnauthorizedAccessException

Read access to the file is not permitted.
InvalidDataException

A problem occurs while deserializing the XML data.

Redo()

Redoes the last action undone by Undo().

Declaration
public void Redo()

Save(String)

Saves the Target to an XML file

Declaration
public virtual void Save(string path)
Parameters
Type Name Description
String path

The file to save to.
Exceptions
Type Condition
IOException

A problem occurs while writing the file.
UnauthorizedAccessException

Write access to the file is not permitted.

Undo()

Undoes the last action performed by Execute(IUndoCommand).

Declaration
public void Undo()

Events

RedoEnabledChanged

Is raised when the value of RedoEnabled has changed.

Declaration
public event Action RedoEnabledChanged
Event Type
Type Description
Action

TargetUpdated

Is raised after Target has been updated.

Declaration
public event Action TargetUpdated
Event Type
Type Description
Action

UndoEnabledChanged

Is raised when the value of UndoEnabled has changed.

Declaration
public event Action UndoEnabledChanged
Event Type
Type Description
Action

Implements

Extension Methods