Package org.opencms.acacia.client

Class CmsUndoRedoHandler

java.lang.Object

org.opencms.acacia.client.CmsUndoRedoHandler

All Implemented Interfaces:

com.google.gwt.event.logical.shared.HasValueChangeHandlers<CmsUndoRedoHandler.UndoRedoState>, com.google.gwt.event.shared.HasHandlers

public final class CmsUndoRedoHandler
extends Object
implements com.google.gwt.event.logical.shared.HasValueChangeHandlers<CmsUndoRedoHandler.UndoRedoState>

Handler for the undo redo function.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	CmsUndoRedoHandler.ChangeTimer	A timer to delay the addition of a change.
static enum	CmsUndoRedoHandler.ChangeType	The change types.
class	CmsUndoRedoHandler.UndoRedoState	Representing the undo/redo state.

Method Summary

Modifier and Type	Method	Description
void	addChange(String valuePath, String attributeName, int valueIndex, CmsUndoRedoHandler.ChangeType changeType)	Adds a change to the undo stack.
protected <H extends com.google.gwt.event.shared.EventHandler> com.google.gwt.event.shared.HandlerRegistration	addHandler(H handler, com.google.gwt.event.shared.GwtEvent.Type<H> type)	Adds this handler to the widget.
com.google.gwt.event.shared.HandlerRegistration	addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler<CmsUndoRedoHandler.UndoRedoState> handler)
void	clear()	Clears the undo/redo stacks and all references.
void	fireEvent(com.google.gwt.event.shared.GwtEvent<?> event)
static CmsUndoRedoHandler	getInstance()	Returns the undo redo handler instance.
boolean	hasRedo()	Indicates if there are changes to be undone.
boolean	hasUndo()	Indicates if there are changes to be undone.
void	initialize(org.opencms.acacia.shared.CmsEntity entity, CmsEditorBase editor, CmsRootHandler rootHandler)	Initializes the handler to be used for the given entity.
boolean	isIntitalized()	Indicates if the handler has been initialized.
void	redo()	Re-applies the latest state in the redo stack.
void	undo()	Reverts to the latest state in the undo stack.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

getInstance

public static CmsUndoRedoHandler getInstance()

Returns the undo redo handler instance.

Returns:

the handler instance

addChange

public void addChange(String valuePath,
 String attributeName,
 int valueIndex,
 CmsUndoRedoHandler.ChangeType changeType)

Adds a change to the undo stack.

Parameters:

valuePath - the entity value path

attributeName - the attribute name

valueIndex - the value index

changeType - the change type

addValueChangeHandler

public com.google.gwt.event.shared.HandlerRegistration addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler<CmsUndoRedoHandler.UndoRedoState> handler)

Specified by:

addValueChangeHandler in interface com.google.gwt.event.logical.shared.HasValueChangeHandlers<CmsUndoRedoHandler.UndoRedoState>

See Also:

• HasValueChangeHandlers.addValueChangeHandler(com.google.gwt.event.logical.shared.ValueChangeHandler)

clear

public void clear()

Clears the undo/redo stacks and all references.

fireEvent

public void fireEvent(com.google.gwt.event.shared.GwtEvent<?> event)

Specified by:

fireEvent in interface com.google.gwt.event.shared.HasHandlers

See Also:

• HasHandlers.fireEvent(com.google.gwt.event.shared.GwtEvent)

hasRedo

public boolean hasRedo()

Indicates if there are changes to be undone.

Returns:

true if there are changes to be undone

hasUndo

public boolean hasUndo()

Indicates if there are changes to be undone.

Returns:

true if there are changes to be undone

initialize

public void initialize(org.opencms.acacia.shared.CmsEntity entity,
 CmsEditorBase editor,
 CmsRootHandler rootHandler)

Initializes the handler to be used for the given entity.

Parameters:

entity - the edited entity

editor - the editor instance

rootHandler - the root attribute handler

isIntitalized

public boolean isIntitalized()

Indicates if the handler has been initialized.

Returns:

true if the handler has been initialized

redo

public void redo()

Re-applies the latest state in the redo stack.

undo

public void undo()

Reverts to the latest state in the undo stack.

addHandler

protected <H extends com.google.gwt.event.shared.EventHandler>
com.google.gwt.event.shared.HandlerRegistration addHandler(H handler,
 com.google.gwt.event.shared.GwtEvent.Type<H> type)

Adds this handler to the widget.

Type Parameters:

H - the type of handler to add

Parameters:

type - the event type

handler - the handler

Returns:

HandlerRegistration used to remove the handler