Mercurial > projects > dwt-addons
view dwtx/text/edits/UndoCollector.d @ 159:7926b636c282
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author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 27 Aug 2008 01:57:58 +0200 |
parents | c4fb132a086c |
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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.text.edits.UndoCollector; import dwtx.text.edits.MultiTextEdit; // packageimport import dwtx.text.edits.CopySourceEdit; // packageimport import dwtx.text.edits.MoveSourceEdit; // packageimport import dwtx.text.edits.CopyingRangeMarker; // packageimport import dwtx.text.edits.ReplaceEdit; // packageimport import dwtx.text.edits.EditDocument; // packageimport import dwtx.text.edits.DeleteEdit; // packageimport import dwtx.text.edits.MoveTargetEdit; // packageimport import dwtx.text.edits.CopyTargetEdit; // packageimport import dwtx.text.edits.TextEditCopier; // packageimport import dwtx.text.edits.ISourceModifier; // packageimport import dwtx.text.edits.TextEditMessages; // packageimport import dwtx.text.edits.TextEditProcessor; // packageimport import dwtx.text.edits.MalformedTreeException; // packageimport import dwtx.text.edits.TreeIterationInfo; // packageimport import dwtx.text.edits.TextEditVisitor; // packageimport import dwtx.text.edits.TextEditGroup; // packageimport import dwtx.text.edits.TextEdit; // packageimport import dwtx.text.edits.RangeMarker; // packageimport import dwtx.text.edits.UndoEdit; // packageimport import dwtx.text.edits.InsertEdit; // packageimport import dwt.dwthelper.utils; import dwtx.core.runtime.Assert; import dwtx.jface.text.BadLocationException; import dwtx.jface.text.DocumentEvent; import dwtx.jface.text.IDocument; import dwtx.jface.text.IDocumentListener; class UndoCollector : IDocumentListener { protected UndoEdit undo; package UndoEdit undo_package(){ return undo; } private int fOffset; private int fLength; /** * @since 3.1 */ private String fLastCurrentText; public this(TextEdit root) { fOffset= root.getOffset(); fLength= root.getLength(); } public void connect(IDocument document) { document.addDocumentListener(this); undo= new UndoEdit(); } public void disconnect(IDocument document) { if (undo !is null) { document.removeDocumentListener(this); undo.defineRegion(fOffset, fLength); } } public void documentChanged(DocumentEvent event) { fLength+= getDelta(event); } private static int getDelta(DocumentEvent event) { String text= event.getText(); return text is null ? -event.getLength() : (text.length() - event.getLength()); } public void documentAboutToBeChanged(DocumentEvent event) { int offset= event.getOffset(); int currentLength= event.getLength(); String currentText= null; try { currentText= event.getDocument().get(offset, currentLength); } catch (BadLocationException cannotHappen) { Assert.isTrue(false, "Can't happen"); //$NON-NLS-1$ } /* * see https://bugs.eclipse.org/bugs/show_bug.cgi?id=93634 * If the same string is replaced on many documents (e.g. rename * package), the size of the undo can be reduced by using the same * String instance in all edits, instead of using the unique String * returned from IDocument.get(int, int). */ if (fLastCurrentText !is null && fLastCurrentText.equals(currentText)) currentText= fLastCurrentText; else fLastCurrentText= currentText; String newText= event.getText(); undo.add(new ReplaceEdit(offset, newText !is null ? newText.length() : 0, currentText)); } }