com.aptana.ide.editor.css.contentassist.CSSContextInformationValidator.java Source code

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Here is the source code for com.aptana.ide.editor.css.contentassist.CSSContextInformationValidator.java

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/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.editor.css.contentassist;

import org.eclipse.jface.resource.ColorRegistry;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.TextPresentation;
import org.eclipse.jface.text.contentassist.IContextInformation;
import org.eclipse.jface.text.contentassist.IContextInformationPresenter;
import org.eclipse.jface.text.contentassist.IContextInformationValidator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;

import com.aptana.ide.core.IdeLog;
import com.aptana.ide.editor.css.CSSOffsetMapper;
import com.aptana.ide.editors.UnifiedEditorsPlugin;

/**
 * 
 */
public class CSSContextInformationValidator implements IContextInformationValidator, IContextInformationPresenter {
    // private CSSOffsetMapper offsetMapper;

    private static final String BLACK_COLOR = "black"; //$NON-NLS-1$

    private static final String COLON = ":"; //$NON-NLS-1$

    /** The code assist processor. */
    private CSSContentAssistProcessor fProcessor;
    /** The context information to be validated. */
    private IContextInformation fContextInformation;

    /**
     * Validates the info window, can add styling.
     * 
     * @param processor
     */
    public CSSContextInformationValidator(CSSContentAssistProcessor processor) {
        fProcessor = processor;
    }

    /**
     * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#install(org.eclipse.jface.text.contentassist.IContextInformation,
     *      org.eclipse.jface.text.ITextViewer, int)
     */
    public void install(IContextInformation contextInformation, ITextViewer viewer, int offset) {
        fContextInformation = contextInformation;
    }

    /**
     * @see org.eclipse.jface.text.contentassist.IContextInformationValidator#isContextInformationValid(int)
     */
    public boolean isContextInformationValid(int offset) {
        if (fProcessor.initalPopup) {
            fProcessor.initalPopup = false;
            return true;
        } else {
            return fProcessor.getCSSOffsetMapper().getMode(offset).equalsIgnoreCase(CSSOffsetMapper.MODE_INVOKING);
        }
    }

    /**
     * @see org.eclipse.jface.text.contentassist.IContextInformationPresenter#updatePresentation(int,
     *      org.eclipse.jface.text.TextPresentation)
     */
    public boolean updatePresentation(int offset, TextPresentation presentation) {
        try {
            String s = this.fContextInformation.getInformationDisplayString();
            if (s.indexOf(COLON) == -1) {
                return false;
            }

            int colonPos = s.indexOf(COLON);

            RGB blackColor = new RGB(0, 0, 0);
            ColorRegistry cm = JFaceResources.getColorRegistry();
            cm.put(BLACK_COLOR, blackColor);
            Color norm = cm.get(BLACK_COLOR); // make this settable

            StyleRange st = new StyleRange(0, colonPos, norm, null, SWT.BOLD);

            presentation.clear();
            presentation.addStyleRange(st);

            return true;
        } catch (Exception e) {
            IdeLog.logError(UnifiedEditorsPlugin.getDefault(),
                    Messages.CSSContextInformationValidator_ErrorUpdatingContextInformation, e);
            return true;
        }
    }

}