Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2015 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.jface.action; /** * A contribution manager organizes contributions to such UI components as * menus, toolbars and status lines. * <p> * A contribution manager keeps track of a list of contribution items. Each * contribution item may has an optional identifier, which can be used to * retrieve items from a manager, and for positioning items relative to each * other. The list of contribution items can be subdivided into named groups * using special contribution items that serve as group markers. * </p> * <p> * The <code>IContributionManager</code> interface provides general protocol for * adding, removing, and retrieving contribution items. It also provides * convenience methods that make it convenient to contribute actions. This * interface should be implemented by all objects that wish to manage * contributions. * </p> * <p> * There are several implementions of this interface in this package, including * ones for menus ({@link MenuManager MenuManager}), tool bars * ({@link ToolBarManager ToolBarManager}), and status lines * ({@link StatusLineManager StatusLineManager}). * </p> */ public interface IContributionManager { /** * Adds an action as a contribution item to this manager. * Equivalent to <code>add(new ActionContributionItem(action))</code>. * * @param action the action, this cannot be <code>null</code> */ void add(IAction action); /** * Adds a contribution item to this manager. * * @param item the contribution item, this cannot be <code>null</code> */ void add(IContributionItem item); /** * Adds a contribution item for the given action at the end of the group * with the given name. * Equivalent to * <code>appendToGroup(groupName,new ActionContributionItem(action))</code>. * * @param groupName the name of the group * @param action the action * @exception IllegalArgumentException if there is no group with * the given name */ void appendToGroup(String groupName, IAction action); /** * Adds a contribution item to this manager at the end of the group * with the given name. * * @param groupName the name of the group * @param item the contribution item * @exception IllegalArgumentException if there is no group with * the given name */ void appendToGroup(String groupName, IContributionItem item); /** * Finds the contribution item with the given id. * * @param id the contribution item id * @return the contribution item, or <code>null</code> if * no item with the given id can be found */ IContributionItem find(String id); /** * Returns all contribution items known to this manager. * * @return a list of contribution items */ IContributionItem[] getItems(); /** * Returns the overrides for the items of this manager. * * @return the overrides for the items of this manager * @since 2.0 */ IContributionManagerOverrides getOverrides(); /** * Inserts a contribution item for the given action after the item * with the given id. * Equivalent to * <code>insertAfter(id,new ActionContributionItem(action))</code>. * * @param id the contribution item id * @param action the action to insert * @exception IllegalArgumentException if there is no item with * the given id */ void insertAfter(String id, IAction action); /** * Inserts a contribution item after the item with the given id. * * @param id the contribution item id * @param item the contribution item to insert * @exception IllegalArgumentException if there is no item with * the given id */ void insertAfter(String id, IContributionItem item); /** * Inserts a contribution item for the given action before the item * with the given id. * Equivalent to * <code>insertBefore(id,new ActionContributionItem(action))</code>. * * @param id the contribution item id * @param action the action to insert * @exception IllegalArgumentException if there is no item with * the given id */ void insertBefore(String id, IAction action); /** * Inserts a contribution item before the item with the given id. * * @param id the contribution item id * @param item the contribution item to insert * @exception IllegalArgumentException if there is no item with * the given id */ void insertBefore(String id, IContributionItem item); /** * Returns whether the list of contributions has recently changed and * has yet to be reflected in the corresponding widgets. * * @return <code>true</code> if this manager is dirty, and <code>false</code> * if it is up-to-date */ boolean isDirty(); /** * Returns whether this manager has any contribution items. * * @return <code>true</code> if there are no items, and * <code>false</code> otherwise */ boolean isEmpty(); /** * Marks this contribution manager as dirty. */ void markDirty(); /** * Adds a contribution item for the given action at the beginning of the * group with the given name. * Equivalent to * <code>prependToGroup(groupName,new ActionContributionItem(action))</code>. * * @param groupName the name of the group * @param action the action * @exception IllegalArgumentException if there is no group with * the given name */ void prependToGroup(String groupName, IAction action); /** * Adds a contribution item to this manager at the beginning of the * group with the given name. * * @param groupName the name of the group * @param item the contribution item * @exception IllegalArgumentException if there is no group with * the given name */ void prependToGroup(String groupName, IContributionItem item); /** * Removes and returns the contribution item with the given id from this manager. * Returns <code>null</code> if this manager has no contribution items * with the given id. * * @param id the contribution item id * @return the item that was found and removed, or <code>null</code> if none */ IContributionItem remove(String id); /** * Removes the given contribution item from the contribution items * known to this manager. * * @param item the contribution item * @return the <code>item</code> parameter if the item was removed, * and <code>null</code> if it was not found */ IContributionItem remove(IContributionItem item); /** * Removes all contribution items from this manager. * <p> * <strong>Note:</strong> The items will not get disposed. * </p> */ void removeAll(); /** * Updates this manager's underlying widget(s) with any changes which * have been made to it or its items. Normally changes to a contribution * manager merely mark it as dirty, without updating the underlying widgets. * This brings the underlying widgets up to date with any changes. * * @param force <code>true</code> means update even if not dirty, * and <code>false</code> for normal incremental updating */ void update(boolean force); }