package org.jtheque.undo.impl; /* * Copyright JTheque (Baptiste Wicht) * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import org.jtheque.undo.UndoRedoService; import org.jtheque.undo.StateListener; import org.jtheque.utils.annotations.GuardedInternally; import org.jtheque.utils.annotations.ThreadSafe; import org.jtheque.utils.collections.WeakEventListenerList; import org.slf4j.LoggerFactory; import javax.swing.undo.CannotUndoException; import javax.swing.undo.UndoManager; import javax.swing.undo.UndoableEdit; /** * An undo-redo manager implementation. * * @author Baptiste Wicht */ @ThreadSafe public final class UndoRedoServiceImpl extends UndoManager implements UndoRedoService { private static final long serialVersionUID = 6050388256567189094L; @GuardedInternally private final WeakEventListenerList<StateListener> eventListenerList = WeakEventListenerList.create(); @Override public boolean addEdit(UndoableEdit arg0) { boolean add = super.addEdit(arg0); fireStateChanged(); return add; } @Override public void undo() { try { super.undo(); } catch (CannotUndoException e) { LoggerFactory.getLogger(getClass()).error(e.getMessage(), e); } finally { fireStateChanged(); } } @Override public void redo() { try { super.redo(); } catch (CannotUndoException e) { LoggerFactory.getLogger(getClass()).error(e.getMessage(), e); } finally { fireStateChanged(); } } @Override public void addStateListener(StateListener stateListener) { eventListenerList.add(stateListener); } @Override public void removeStateListener(StateListener stateListener) { eventListenerList.remove(stateListener); } /** * Update the state of the undo/redo action. */ private void fireStateChanged() { String undoName = getUndoPresentationName(); String redoName = getRedoPresentationName(); boolean canRedo = canRedo(); boolean canUndo = canUndo(); for (StateListener stateListener : eventListenerList) { stateListener.stateChanged(undoName, canUndo, redoName, canRedo); } } }