| /******************************************************************************* |
| * Copyright (c) 2007, 2009 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.compare.internal; |
| |
| import java.util.*; |
| |
| import org.eclipse.jface.text.WhitespaceCharacterPainter; |
| |
| import org.eclipse.ui.texteditor.AbstractTextEditor; |
| |
| public class ShowWhitespaceAction extends TextEditorPropertyAction { |
| |
| private Map fPainters; |
| private boolean isWhitespaceShowing; |
| private boolean[] fNeedsPainters; |
| |
| public ShowWhitespaceAction(MergeSourceViewer[] viewers, boolean[] needsPainters) { |
| super(CompareMessages.ShowWhitespaceAction_0, viewers, AbstractTextEditor.PREFERENCE_SHOW_WHITESPACE_CHARACTERS); |
| fNeedsPainters = needsPainters; |
| synchronizeWithPreference(); |
| } |
| |
| protected void toggleState(boolean checked) { |
| if (fNeedsPainters == null) |
| return; // Not initialized yet |
| if (checked) { |
| showWhitespace(); |
| } else { |
| hideWhitespace(); |
| } |
| } |
| |
| private synchronized Map getPainters() { |
| if (fPainters == null) |
| fPainters = new HashMap(); |
| return fPainters; |
| } |
| |
| private void showWhitespace() { |
| if (isWhitespaceShowing) |
| return; |
| try { |
| Map painters = getPainters(); |
| MergeSourceViewer[] viewers = getViewers(); |
| for (int i = 0; i < viewers.length; i++) { |
| if (fNeedsPainters[i]) { |
| MergeSourceViewer viewer = viewers[i]; |
| WhitespaceCharacterPainter painter= new WhitespaceCharacterPainter(viewer.getSourceViewer()); |
| viewer.getSourceViewer().addPainter(painter); |
| painters.put(viewer, painter); |
| } |
| } |
| } finally { |
| isWhitespaceShowing = true; |
| } |
| } |
| |
| private void hideWhitespace() { |
| Map painters = getPainters(); |
| for (Iterator iterator = painters.keySet().iterator(); iterator.hasNext();) { |
| MergeSourceViewer viewer = (MergeSourceViewer) iterator.next(); |
| WhitespaceCharacterPainter painter = (WhitespaceCharacterPainter)painters.get(viewer); |
| if (painter != null) { |
| viewer.getSourceViewer().removePainter(painter); |
| painter.deactivate(true); |
| } |
| } |
| painters.clear(); |
| isWhitespaceShowing = false; |
| } |
| |
| } |