Mercurial > projects > dwt-addons
view dwtx/jface/text/link/LinkedModeManager.d @ 143:53b889547456
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author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 24 Aug 2008 21:32:37 +0200 |
parents | 25170b5a8951 |
children | f70d9508c95c |
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/******************************************************************************* * Copyright (c) 2000, 2006 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.jface.text.link.LinkedModeManager; import dwtx.jface.text.link.LinkedModeModel; // packageimport import dwtx.jface.text.link.LinkedPosition; // packageimport import dwtx.jface.text.link.ILinkedModeListener; // packageimport import dwtx.jface.text.link.TabStopIterator; // packageimport import dwtx.jface.text.link.LinkedModeUI; // packageimport import dwtx.jface.text.link.InclusivePositionUpdater; // packageimport import dwtx.jface.text.link.LinkedPositionGroup; // packageimport import dwtx.jface.text.link.LinkedPositionAnnotations; // packageimport import dwtx.jface.text.link.ProposalPosition; // packageimport import dwt.dwthelper.utils; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.Map; import java.util.Set; import java.util.Stack; import dwtx.core.runtime.Assert; import dwtx.jface.text.IDocument; /** * A linked mode manager ensures exclusive access of linked position infrastructures to documents. There * is at most one <code>LinkedModeManager</code> installed on the same document. The <code>getManager</code> * methods will return the existing instance if any of the specified documents already have an installed * manager. * * @since 3.0 */ class LinkedModeManager { /** * Our implementation of <code>ILinkedModeListener</code>. */ private class Listener : ILinkedModeListener { /* * @see dwtx.jdt.internal.ui.text.link2.LinkedModeModel.ILinkedModeListener#left(dwtx.jdt.internal.ui.text.link2.LinkedModeModel, int) */ public void left(LinkedModeModel model, int flags) { this.outer.left(model, flags); } /* * @see dwtx.jdt.internal.ui.text.link2.LinkedModeModel.ILinkedModeListener#suspend(dwtx.jdt.internal.ui.text.link2.LinkedModeModel) */ public void suspend(LinkedModeModel model) { // not interested } /* * @see dwtx.jdt.internal.ui.text.link2.LinkedModeModel.ILinkedModeListener#resume(dwtx.jdt.internal.ui.text.link2.LinkedModeModel, int) */ public void resume(LinkedModeModel model, int flags) { // not interested } } /** Global map from documents to managers. */ private static Map fgManagers= new HashMap(); /** * Returns whether there exists a <code>LinkedModeManager</code> on <code>document</code>. * * @param document the document of interest * @return <code>true</code> if there exists a <code>LinkedModeManager</code> on <code>document</code>, <code>false</code> otherwise */ public static bool hasManager(IDocument document) { return fgManagers.get(document) !is null; } /** * Returns whether there exists a <code>LinkedModeManager</code> on any of the <code>documents</code>. * * @param documents the documents of interest * @return <code>true</code> if there exists a <code>LinkedModeManager</code> on any of the <code>documents</code>, <code>false</code> otherwise */ public static bool hasManager(IDocument[] documents) { for (int i= 0; i < documents.length; i++) { if (hasManager(documents[i])) return true; } return false; } /** * Returns the manager for the given documents. If <code>force</code> is * <code>true</code>, any existing conflicting managers are canceled, otherwise, * the method may return <code>null</code> if there are conflicts. * * @param documents the documents of interest * @param force whether to kill any conflicting managers * @return a manager able to cover the requested documents, or <code>null</code> if there is a conflict and <code>force</code> was set to <code>false</code> */ public static LinkedModeManager getLinkedManager(IDocument[] documents, bool force) { if (documents is null || documents.length is 0) return null; Set mgrs= new HashSet(); LinkedModeManager mgr= null; for (int i= 0; i < documents.length; i++) { mgr= cast(LinkedModeManager) fgManagers.get(documents[i]); if (mgr !is null) mgrs.add(mgr); } if (mgrs.size() > 1) if (force) { for (Iterator it= mgrs.iterator(); it.hasNext(); ) { LinkedModeManager m= cast(LinkedModeManager) it.next(); m.closeAllEnvironments(); } } else { return null; } if (mgrs.size() is 0) mgr= new LinkedModeManager(); for (int i= 0; i < documents.length; i++) fgManagers.put(documents[i], mgr); return mgr; } /** * Cancels any linked mode manager for the specified document. * * @param document the document whose <code>LinkedModeManager</code> should be canceled */ public static void cancelManager(IDocument document) { LinkedModeManager mgr= cast(LinkedModeManager) fgManagers.get(document); if (mgr !is null) mgr.closeAllEnvironments(); } /** The hierarchy of environments managed by this manager. */ private Stack fEnvironments= new Stack(); private Listener fListener= new Listener(); /** * Notify the manager about a leaving model. * * @param model * @param flags */ private void left(LinkedModeModel model, int flags) { if (!fEnvironments.contains(model)) return; while (!fEnvironments.isEmpty()) { LinkedModeModel env= cast(LinkedModeModel) fEnvironments.pop(); if (env is model) break; env.exit(ILinkedModeListener.NONE); } if (fEnvironments.isEmpty()) { removeManager(); } } private void closeAllEnvironments() { while (!fEnvironments.isEmpty()) { LinkedModeModel env= cast(LinkedModeModel) fEnvironments.pop(); env.exit(ILinkedModeListener.NONE); } removeManager(); } private void removeManager() { for (Iterator it= fgManagers.keySet().iterator(); it.hasNext();) { IDocument doc= cast(IDocument) it.next(); if (fgManagers.get(doc) is this) it.remove(); } } /** * Tries to nest the given <code>LinkedModeModel</code> onto the top of * the stack of environments managed by the receiver. If <code>force</code> * is <code>true</code>, any environments on the stack that create a conflict * are killed. * * @param model the model to nest * @param force whether to force the addition of the model * @return <code>true</code> if nesting was successful, <code>false</code> otherwise (only possible if <code>force</code> is <code>false</code> */ public bool nestEnvironment(LinkedModeModel model, bool force) { Assert.isNotNull(model); try { while (true) { if (fEnvironments.isEmpty()) { model.addLinkingListener(fListener); fEnvironments.push(model); return true; } LinkedModeModel top= cast(LinkedModeModel) fEnvironments.peek(); if (model.canNestInto(top)) { model.addLinkingListener(fListener); fEnvironments.push(model); return true; } else if (!force) { return false; } else { // force fEnvironments.pop(); top.exit(ILinkedModeListener.NONE); // continue; } } } finally { // if we remove any, make sure the new one got inserted Assert.isTrue(fEnvironments.size() > 0); } } /** * Returns the <code>LinkedModeModel</code> that is on top of the stack of * environments managed by the receiver. * * @return the topmost <code>LinkedModeModel</code> */ public LinkedModeModel getTopEnvironment() { if (fEnvironments.isEmpty()) return null; return cast(LinkedModeModel) fEnvironments.peek(); } }