org.jboss.tools.aesh.ui.internal.util.FontManager.java Source code

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Here is the source code for org.jboss.tools.aesh.ui.internal.util.FontManager.java

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/**
 * Copyright (c) Red Hat, Inc., contributors and others 2013 - 2014. All rights reserved
 *
 * Licensed under the Eclipse Public License version 1.0, available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package org.jboss.tools.aesh.ui.internal.util;

import java.util.ArrayList;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;

public class FontManager {

    public static final String AESH_CONSOLE_FONT = "org.jboss.tools.aesh.ui.font";

    public static FontManager INSTANCE = new FontManager();

    private static Font ITALIC;
    private static Font DEFAULT;
    private static Font BOLD;
    private static Font ITALIC_BOLD;

    private ArrayList<IPropertyChangeListener> listeners = new ArrayList<>();

    private FontManager() {
        initializeFonts();
        initializeListener();
    }

    private void initializeDefault() {
        DEFAULT = JFaceResources.getFont(AESH_CONSOLE_FONT);
    }

    private FontData createFontDataFromNormal() {
        FontData normalData = DEFAULT.getFontData()[0];
        FontData result = new FontData();
        result.setName(normalData.getName());
        result.height = normalData.height;
        return result;
    }

    private void initializeItalic() {
        FontData italicData = createFontDataFromNormal();
        italicData.setStyle(SWT.ITALIC);
        ITALIC = new Font(DEFAULT.getDevice(), italicData);
    }

    private void initializeBold() {
        FontData boldData = createFontDataFromNormal();
        boldData.setStyle(SWT.BOLD);
        BOLD = new Font(DEFAULT.getDevice(), boldData);
    }

    private void initializeItalicBold() {
        FontData italicBoldData = createFontDataFromNormal();
        italicBoldData.setStyle(SWT.BOLD | SWT.ITALIC);
        ITALIC_BOLD = new Font(DEFAULT.getDevice(), italicBoldData);
    }

    public Font getDefault() {
        return DEFAULT;
    }

    public Font getItalic() {
        return ITALIC;
    }

    public Font getBold() {
        return BOLD;
    }

    public Font getItalicBold() {
        return ITALIC_BOLD;
    }

    public void addListener(IPropertyChangeListener listener) {
        listeners.add(listener);
    }

    public void removeListener(IPropertyChangeListener listener) {
        listeners.remove(listener);
    }

    private void initializeListener() {
        JFaceResources.getFontRegistry().addListener(new IPropertyChangeListener() {
            @Override
            public void propertyChange(PropertyChangeEvent event) {
                if (AESH_CONSOLE_FONT.equals(event.getProperty())) {
                    initializeFonts();
                    informListeners(event);
                }
            }
        });
    }

    private void informListeners(PropertyChangeEvent event) {
        for (IPropertyChangeListener listener : listeners) {
            listener.propertyChange(event);
        }
    }

    private void initializeFonts() {
        initializeDefault();
        initializeBold();
        initializeItalic();
        initializeItalicBold();
    }

}