13.4. Property Pages Reused as Preference Pages

Since PropertyPage inherits from PreferencePage, with a little work you can reuse a Property page as a Preference page. In this case, you want to reuse the FavoriteItemPropertyPage as a Preference page for specifying the Color and comment properties' default values. To accomplish this, create a new FavoriteDefaultsPreferencePage as a subclass of FavoriteItemPropertyPage, which implements org.eclipse.ui.IWorkbenchPreferencePage and overrides the property accessor methods.

package com.qualityeclipse.favorites.properties;

import ...

public class FavoriteDefaultsPreferencePage
   extends FavoriteItemPropertyPage
   implements IWorkbenchPreferencePage
{
   public void init(IWorkbench workbench) {
   }

   protected RGB getColorPropertyValue() {
      return BasicFavoriteItem.getDefaultColor().getRGB();
   }

   protected void setColorPropertyValue(RGB rgb) {
      BasicFavoriteItem.setDefaultColor(
         BasicFavoriteItem.getColor(rgb));
   }

   protected String getCommentPropertyValue() {
      return BasicFavoriteItem.getDefaultComment();
   }

   protected void setCommentPropertyValue(String comment) {
      BasicFavoriteItem.setDefaultComment(comment);
   }
}

Then, create a new Preference page declaration in the Favorites plug-in manifest (see Section 12.1, Creating a Preference Page, on page 451) with the following attributes:

category = "com.qualityeclipse.favorites.prefs.view"

class = "com.qualityeclipse.favorites.properties.FavoriteDefaultsPreferencePage"

id = "com.qualityeclipse.favorites.prefs.defaults"

name = "Defaults"

When complete, the Defaults preference page appears in the workbench Preferences dialog as a child of the Favorites preference page (see Figure 13-7).