Activator.java

package info.limpet.stackedcharts.ui.editor;

import org.eclipse.jface.resource.FontRegistry;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin
{

  /**
   * declare some string constants that we use for a predetermined set of chart fonts
   * 
   */
  public static final String FONT_12 = "FONT_12";

  public static final String FONT_10 = "FONT_10";

  public static final String FONT_8 = "FONT_8";

  // The plug-in ID
  public static final String PLUGIN_ID = "info.limpet.stackedcharts.ui"; //$NON-NLS-1$

  // The shared instance
  private static Activator plugin;

  /**
   * our font registry, to reduce object creation
   * 
   */
  private FontRegistry fontReg;

  /**
   * The constructor
   */
  public Activator()
  {
  }

  public Font getFont(String name)
  {
    return fontReg.get(name);
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
   */
  public void start(BundleContext context) throws Exception
  {
    super.start(context);
    plugin = this;
    fontReg = new FontRegistry(Display.getCurrent());

    // initialise some fonts
    fontReg.put(FONT_8, new FontData[]
    {new FontData("Arial", 8, SWT.None)});
    fontReg.put(FONT_10, new FontData[]
    {new FontData("Arial", 10, SWT.None)});
    fontReg.put(FONT_12, new FontData[]
    {new FontData("Arial", 12, SWT.None)});
  }

  /*
   * (non-Javadoc)
   * 
   * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
   */
  public void stop(BundleContext context) throws Exception
  {
    plugin = null;
    super.stop(context);
  }

  /**
   * Returns the shared instance
   * 
   * @return the shared instance
   */
  public static Activator getDefault()
  {
    return plugin;
  }

}