Mercurial > projects > dwt-addons
view dwtx/jface/text/projection/FragmentUpdater.d @ 129:eb30df5ca28b
Added JFace Text sources
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 23 Aug 2008 19:10:48 +0200 |
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children | c4fb132a086c |
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/******************************************************************************* * Copyright (c) 2000, 2005 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.projection.FragmentUpdater; import dwt.dwthelper.utils; import dwtx.jface.text.BadLocationException; import dwtx.jface.text.BadPositionCategoryException; import dwtx.jface.text.DefaultPositionUpdater; import dwtx.jface.text.DocumentEvent; import dwtx.jface.text.IDocument; import dwtx.jface.text.Position; /** * The position updater used to adapt the fragments of a master document. If an * insertion happens at a fragment's offset, the fragment is extended rather * than shifted. Also, the last fragment is extended if an insert operation * happens at the end of the fragment. * * @since 3.0 */ class FragmentUpdater : DefaultPositionUpdater { /** Indicates whether the position being updated represents the last fragment. */ private bool fIsLast= false; /** * Creates the fragment updater for the given category. * * @param fragmentCategory the position category used for managing the fragments of a document */ protected FragmentUpdater(String fragmentCategory) { super(fragmentCategory); } /* * @see dwtx.jface.text.IPositionUpdater#update(dwtx.jface.text.DocumentEvent) */ public void update(DocumentEvent event) { try { Position[] category= event.getDocument().getPositions(getCategory()); fOffset= event.getOffset(); fLength= event.getLength(); fReplaceLength= (event.getText() is null ? 0 : event.getText().length()); fDocument= event.getDocument(); for (int i= 0; i < category.length; i++) { fPosition= category[i]; fIsLast= (i is category.length -1); fOriginalPosition.offset= fPosition.offset; fOriginalPosition.length= fPosition.length; if (notDeleted()) adaptToReplace(); } } catch (BadPositionCategoryException x) { // do nothing } } /* * @see dwtx.jface.text.DefaultPositionUpdater#adaptToInsert() */ protected void adaptToInsert() { int myStart= fPosition.offset; int myEnd= Math.max(myStart, fPosition.offset + fPosition.length - (fIsLast || isAffectingReplace() ? 0 : 1)); if (myEnd < fOffset) return; if (fLength <= 0) { if (myStart <= fOffset) fPosition.length += fReplaceLength; else fPosition.offset += fReplaceLength; } else { if (myStart <= fOffset && fOriginalPosition.offset <= fOffset) fPosition.length += fReplaceLength; else fPosition.offset += fReplaceLength; } } /** * Returns whether this updater considers any position affected by the given document event. A * position is affected if <code>event</code> {@link Position#overlapsWith(int, int) overlaps} * with it but not if the position is only shifted. * * @param event the event * @return <code>true</code> if there is any affected position, <code>false</code> otherwise */ public bool affectsPositions(DocumentEvent event) { IDocument document= event.getDocument(); try { int index= document.computeIndexInCategory(getCategory(), event.getOffset()); Position[] fragments= document.getPositions(getCategory()); if (0 < index) { Position fragment= fragments[index - 1]; if (fragment.overlapsWith(event.getOffset(), event.getLength())) return true; if (index is fragments.length && fragment.offset + fragment.length is event.getOffset()) return true; } if (index < fragments.length) { Position fragment= fragments[index]; return fragment.overlapsWith(event.getOffset(), event.getLength()); } } catch (BadLocationException x) { } catch (BadPositionCategoryException x) { } return false; } }