/*
* Copyright 2000-2007 JetBrains s.r.o.
*
* 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.
*/
package com.intellij.util.xml.ui;
import com.intellij.openapi.command.CommandAdapter;
import com.intellij.openapi.command.CommandEvent;
import com.intellij.openapi.command.CommandProcessor;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.event.DocumentAdapter;
import com.intellij.openapi.editor.event.DocumentEvent;
import com.intellij.openapi.project.Project;
import com.intellij.psi.PsiDocumentManager;
import java.util.HashSet;
import java.util.Set;
/**
* @author peter
*/
public class UndoHelper {
private final Project myProject;
private boolean myShowing;
private final Set<Document> myCurrentDocuments = new HashSet<Document>();
private boolean myDirty;
private final DocumentAdapter myDocumentAdapter = new DocumentAdapter() {
public void documentChanged(DocumentEvent e) {
if (myShowing) {
myDirty = true;
}
}
};
public UndoHelper(final Project project, final Committable committable) {
myProject = project;
final PsiDocumentManager psiDocumentManager = PsiDocumentManager.getInstance(project);
CommandProcessor.getInstance().addCommandListener(new CommandAdapter() {
public void commandStarted(CommandEvent event) {
undoTransparentActionStarted();
}
public void undoTransparentActionStarted() {
myDirty = false;
}
public void undoTransparentActionFinished() {
if (myDirty) {
psiDocumentManager.commitAllDocuments();
committable.reset();
}
}
public void commandFinished(CommandEvent event) {
undoTransparentActionFinished();
}
}, committable);
}
public final void startListeningDocuments() {
for (final Document document : myCurrentDocuments) {
document.addDocumentListener(myDocumentAdapter);
}
}
public final void stopListeningDocuments() {
for (final Document document : myCurrentDocuments) {
document.removeDocumentListener(myDocumentAdapter);
}
}
public final void setShowing(final boolean showing) {
commitAllDocuments();
myShowing = showing;
}
public boolean isShowing() {
return myShowing;
}
public final void commitAllDocuments() {
final PsiDocumentManager manager = getDocumentManager();
for (final Document document : myCurrentDocuments) {
manager.commitDocument(document);
}
}
private PsiDocumentManager getDocumentManager() {
return PsiDocumentManager.getInstance(myProject);
}
public final void addWatchedDocument(final Document document) {
stopListeningDocuments();
myCurrentDocuments.add(document);
startListeningDocuments();
}
public final void removeWatchedDocument(final Document document) {
stopListeningDocuments();
myCurrentDocuments.remove(document);
startListeningDocuments();
}
public final Document[] getDocuments() {
return myCurrentDocuments.toArray(new Document[myCurrentDocuments.size()]);
}
}