com.siteview.mde.internal.ui.editor.text.BasePDEScanner.java Source code

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Here is the source code for com.siteview.mde.internal.ui.editor.text.BasePDEScanner.java

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/*******************************************************************************
 *  Copyright (c) 2005, 2008 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
 *******************************************************************************/
package com.siteview.mde.internal.ui.editor.text;

import org.eclipse.jface.preference.IPreferenceStore;
import org.eclipse.jface.text.TextAttribute;
import org.eclipse.jface.text.rules.BufferedRuleBasedScanner;
import org.eclipse.jface.text.rules.Token;
import org.eclipse.jface.util.PropertyChangeEvent;
import com.siteview.mde.internal.ui.MDEPlugin;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;

public abstract class BasePDEScanner extends BufferedRuleBasedScanner {

    private IColorManager fColorManager;

    protected BasePDEScanner() {
    }

    public void setColorManager(IColorManager manager) {
        fColorManager = manager;
    }

    public BasePDEScanner(IColorManager manager) {
        fColorManager = manager;
        initialize();
    }

    public void adaptToPreferenceChange(PropertyChangeEvent event) {
        String property = event.getProperty();
        if (affectsTextPresentation(property)) {
            Token token = getTokenAffected(event);
            if (property.endsWith(IPDEColorConstants.P_BOLD_SUFFIX))
                adaptToStyleChange(event, token, SWT.BOLD);
            else if (property.endsWith(IPDEColorConstants.P_ITALIC_SUFFIX))
                adaptToStyleChange(event, token, SWT.ITALIC);
            else
                adaptToColorChange(event, token);
        }
    }

    public abstract boolean affectsTextPresentation(String property);

    protected abstract Token getTokenAffected(PropertyChangeEvent event);

    protected abstract void initialize();

    protected void adaptToStyleChange(PropertyChangeEvent event, Token token, int styleAttribute) {
        if (token == null)
            return;

        boolean eventValue = false;
        Object value = event.getNewValue();
        if (value instanceof Boolean)
            eventValue = ((Boolean) value).booleanValue();

        TextAttribute attr = (TextAttribute) token.getData();
        boolean activeValue = (attr.getStyle() & styleAttribute) == styleAttribute;
        if (activeValue != eventValue) {
            Color foreground = attr.getForeground();
            Color background = attr.getBackground();
            int style = eventValue ? attr.getStyle() | styleAttribute : attr.getStyle() & ~styleAttribute;
            token.setData(new TextAttribute(foreground, background, style));
        }
    }

    protected void adaptToColorChange(PropertyChangeEvent event, Token token) {
        TextAttribute attr = (TextAttribute) token.getData();
        token.setData(new TextAttribute(fColorManager.getColor(event.getProperty()), attr.getBackground(),
                attr.getStyle()));
    }

    protected TextAttribute createTextAttribute(String property) {
        return createTextAttribute(fColorManager, property);
    }

    protected static TextAttribute createTextAttribute(IColorManager manager, String property) {
        Color color = manager.getColor(property);
        int style = SWT.NORMAL;
        IPreferenceStore store = MDEPlugin.getDefault().getPreferenceStore();
        if (store.getBoolean(property + IPDEColorConstants.P_BOLD_SUFFIX))
            style |= SWT.BOLD;
        if (store.getBoolean(property + IPDEColorConstants.P_ITALIC_SUFFIX))
            style |= SWT.ITALIC;
        return new TextAttribute(color, null, style);
    }

}