Vincenzo

The JFace library offers some widgets, called viewers, that can represent a data model. What are they for? Let's suppose you want to show a table, a tree or a combo in order to visualize a list of objects or a hierarchical structure. You could certainly make use of basic widgets like Table, Tree or Combo, but they are usually not a good choice. Imagine you while filling a table, row by row, starting from a list of Orders and your focus is doing some action with the Order that the user selected. With a Table widget you have to [...]

In order to manage the visibility of a menu item we can extend AbstractSourceProvider. Let's see how to do that. First of all we have to create a class that extends AbstractSourceProvider. This class is intended to hold the state variable and provide it to the platform when needed. In this example we intend to manage the visibility of a menu item depending on the user profile. [java] package com.rcpvision; import java.util.HashMap; import java.util.Map; import org.eclipse.ui.AbstractSourceProvider; import org.eclipse.ui.ISources; public class SessionSourceProvider extends AbstractSourceProvider { public final static String SESSION_USER_CAN_SEE_PREFS = "com.rcpvision.session.user-can-see-preferences"; private final static String CAN_SEE = "canSee"; private final [...]