CommandStack (EMF Documentation)

All Known Implementing Classes:

BasicCommandStack, PersistentCommandStack
```
public interface CommandStack
```
A simple and obvious interface for an undoable stack of commands with a listener. See Command for more details about the command methods that this implementation uses and CommandStackListener for details about the listener.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`addCommandStackListener(CommandStackListener listener)` Adds a listener to the command stack, which will be notified whenever a command has been processed on the stack.
`boolean`	`canRedo()` Returns whether there are commands past the top of the stack that can be redone.
`boolean`	`canUndo()` Returns whether the top command on the stack can be undone.
`void`	`execute(Command command)` Clears any redoable commands not yet redone, adds the command, and then executes the command.
`void`	`flush()` Disposes all the commands in the stack.
`Command`	`getMostRecentCommand()` Returns the command most recently executed, undone, or redone.
`Command`	`getRedoCommand()` Returns the command that will be redone if `redo()` is called.
`Command`	`getUndoCommand()` Returns the command that will be undone if `undo()` is called.
`void`	`redo()` Moves the top of the stack up, redoing the new top command.
`void`	`removeCommandStackListener(CommandStackListener listener)` Removes a listener from the command stack.
`void`	`undo()` Moves the top of the stack down, undoing what was formerly the top command.

- Method Detail
  - execute
```
void execute(Command command)
```
    Clears any redoable commands not yet redone, adds the command, and then executes the command.
    
    Parameters:
    command - the command to execute.
  - canUndo
```
boolean canUndo()
```
    Returns whether the top command on the stack can be undone.
    
    Returns:
    whether the top command on the stack can be undone.
  - undo
```
void undo()
```
    Moves the top of the stack down, undoing what was formerly the top command.
  - canRedo
```
boolean canRedo()
```
    Returns whether there are commands past the top of the stack that can be redone.
    
    Returns:
    whether there are commands past the top of the stack that can be redone.
  - getUndoCommand
```
Command getUndoCommand()
```
    Returns the command that will be undone if undo() is called.
    
    Returns:
    the command that will be undone if undo() is called.
  - getRedoCommand
```
Command getRedoCommand()
```
    Returns the command that will be redone if redo() is called.
    
    Returns:
    the command that will be redone if redo() is called.
  - getMostRecentCommand
```
Command getMostRecentCommand()
```
    Returns the command most recently executed, undone, or redone.
    
    Returns:
    the command most recently executed, undone, or redone.
  - redo
```
void redo()
```
    Moves the top of the stack up, redoing the new top command.
  - flush
```
void flush()
```
    Disposes all the commands in the stack.
  - addCommandStackListener
```
void addCommandStackListener(CommandStackListener listener)
```
    Adds a listener to the command stack, which will be notified whenever a command has been processed on the stack.
    
    Parameters:
    listener - the listener to add.
  - removeCommandStackListener
```
void removeCommandStackListener(CommandStackListener listener)
```
    Removes a listener from the command stack.
    
    Parameters:
    listener - the listener to remove.

Interface CommandStack

Method Summary

Method Detail

execute

canUndo

undo

canRedo

getUndoCommand

getRedoCommand

getMostRecentCommand

redo

flush

addCommandStackListener

removeCommandStackListener