X-Git-Url: http://secure.phpeclipse.com diff --git a/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java new file mode 100644 index 0000000..2e45960 --- /dev/null +++ b/archive/net.sourceforge.phpeclipse.css.ui/src/net/sourceforge/phpeclipse/css/ui/internal/text/CssDoubleClickStrategy.java @@ -0,0 +1,116 @@ +/* + * Copyright (c) 2003-2004 Christopher Lenz and others. + * All rights reserved. This program and the accompanying materials + * are made available under the terms of the Common Public License v1.0 + * which accompanies this distribution, and is available at + * http://www.eclipse.org/legal/cpl-v10.html + * + * Contributors: + * Christopher Lenz - initial API and implementation + * + * $Id: CssDoubleClickStrategy.java,v 1.1 2004-09-02 18:11:48 jsurfer Exp $ + */ + +package net.sourceforge.phpeclipse.css.ui.internal.text; + +import net.sourceforge.phpeclipse.css.core.internal.text.CssTextUtils; +import net.sourceforge.phpeclipse.css.ui.CssUI; + +import org.eclipse.jface.text.BadLocationException; +import org.eclipse.jface.text.IDocument; +import org.eclipse.jface.text.IRegion; +import org.eclipse.jface.text.ITextDoubleClickStrategy; +import org.eclipse.jface.text.ITextViewer; +import org.eclipse.jface.text.Region; +import org.eclipse.jface.text.source.ICharacterPairMatcher; +import org.eclipse.jface.util.Assert; + +/** + * Strategy for selecting CSS identifiers on double click in the editor. + * + * This strategy implements selection of CSS identifiers on double click inside + * an identifier, as well as selection of blocks delimited by square brackets, + * curly braces and parenthesis when the user double clicks directly after + * either the opening or the closing delimiter. + */ +public class CssDoubleClickStrategy implements ITextDoubleClickStrategy { + + // Instance Variables ------------------------------------------------------ + + /** + * The pair matcher used to select ranges delimited by matching pairs of + * braces, brackets and parenthesis. + */ + private ICharacterPairMatcher pairMatcher = new CssPairMatcher(); + + // ITextDoubleClickStrategy Implementation --------------------------------- + + /* + * @see ITextDoubleClickStrategy#doubleClicked(ITextViewer) + */ + public void doubleClicked(ITextViewer viewer) { + IDocument document = viewer.getDocument(); + if (document.getLength() == 0) { + return; + } + int offset = viewer.getSelectedRange().x; + Assert.isLegal(offset >= 0, + "Double click offset may not be negative"); //$NON-NLS-1$ + Assert.isLegal(offset <= document.getLength(), + "Double click offset out of range"); //$NON-NLS-1$ + IRegion region = pairMatcher.match(document, offset); + if ((region != null) && (region.getLength() >= 2)) { + viewer.setSelectedRange(region.getOffset() + 1, + region.getLength() - 2); + } else { + try { + region = getSurroundingIdentifier(document, offset); + if (region != null) { + viewer.setSelectedRange( + region.getOffset(), region.getLength()); + } + } catch (BadLocationException e) { + CssUI.log("Failed to get surrounding " + //$NON-NLS-1$ + "word for double click selection"); //$NON-NLS-1$ + } + } + } + + // Private Methods --------------------------------------------------------- + + /** + * Returns the region that delimits the identifier surrounding the given + * offset into the document. If no identifier is found at the specified + * offset, this method returns null. + * + * @param doc the document + * @param offset the zero-based offset into the document + * @return the region covered by the identifier, or null if no + * identifier was found at that offset + */ + private IRegion getSurroundingIdentifier(IDocument doc, int offset) + throws BadLocationException { + IRegion retVal = null; + int length = doc.getLength(); + offset = Math.min(offset, length - 1); + if (CssTextUtils.isCssIdentifierPart(doc.getChar(offset))) { + int start = offset; + while (start > 0) { + if (!CssTextUtils.isCssIdentifierPart(doc.getChar(start - 1))) { + break; + } + start--; + } + int end = offset; + while (end < (length - 1)) { + if (!CssTextUtils.isCssIdentifierPart(doc.getChar(end + 1))) { + break; + } + end++; + } + retVal = new Region(start, end - start + 1); + } + return retVal; + } + +}