| /******************************************************************************* |
| * Copyright (c) 2000, 2005 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal; |
| |
| import org.eclipse.ui.IEditorPart; |
| import org.eclipse.ui.IWorkbenchPage; |
| import org.eclipse.ui.IWorkbenchPart; |
| import org.eclipse.ui.IWorkbenchWindow; |
| import org.eclipse.ui.actions.ActionFactory.IWorkbenchAction; |
| |
| /** |
| * The abstract superclass for actions that depend on the active editor. |
| * This implementation tracks the active editor (see <code>getActiveEditor</code>) |
| * and updates the availability of the action when an editor becomes |
| * active. |
| * <p> |
| * Subclasses must implement the following <code>IAction</code> method: |
| * <ul> |
| * <li><code>run</code> - to do the action's work</li> |
| * </ul> |
| * </p> |
| * <p> |
| * Subclasses may extend any of the <code>IPartListener</code> methods if the |
| * action availablity needs to be recalculated: |
| * <ul> |
| * <li><code>partActivated</code></li> |
| * <li><code>partDeactivated</code></li> |
| * <li><code>partOpened</code></li> |
| * <li><code>partClosed</code></li> |
| * <li><code>partBroughtToTop</code></li> |
| * </ul> |
| * </p> |
| * <p> |
| * Subclasses may extend any of the <code>IPageListener</code> methods if the |
| * action availablity needs to be recalculated: |
| * <ul> |
| * <li><code>pageActivated</code></li> |
| * <li><code>pageClosed</code></li> |
| * <li><code>pageOpened</code></li> |
| * </ul> |
| * </p> |
| * <p> |
| * This method implements the <code>IPartListener</code> and |
| * <code>IPageListener</code>interfaces, and automatically registers listeners |
| * so that it can keep its enablement state up to date. Ordinarily, the |
| * window's references to these listeners will be dropped automatically when |
| * the window closes. However, if the client needs to get rid of an action |
| * while the window is still open, the client must call |
| * {@link IWorkbenchAction#dispose dispose} to give the action an |
| * opportunity to deregister its listeners and to perform any other cleanup. |
| * </p> |
| */ |
| public abstract class ActiveEditorAction extends PageEventAction { |
| |
| private IEditorPart activeEditor; |
| |
| /** |
| * Creates a new action with the given text. |
| * |
| * @param text the string used as the text for the action, |
| * or <code>null</code> if there is no text |
| * @param window the workbench window this action is |
| * registered with. |
| */ |
| protected ActiveEditorAction(String text, IWorkbenchWindow window) { |
| super(text, window); |
| updateState(); |
| } |
| |
| /** |
| * Notification that the active editor tracked |
| * by the action is being activated. |
| * |
| * Subclasses may override. |
| */ |
| protected void editorActivated(IEditorPart part) { |
| } |
| |
| /** |
| * Notification that the active editor tracked |
| * by the action is being deactivated. |
| * |
| * Subclasses may override. |
| */ |
| protected void editorDeactivated(IEditorPart part) { |
| } |
| |
| /** |
| * Return the active editor |
| * |
| * @return the page's active editor, and <code>null</code> |
| * if no active editor or no active page. |
| */ |
| public final IEditorPart getActiveEditor() { |
| return activeEditor; |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PageEventAction. |
| */ |
| public void pageActivated(IWorkbenchPage page) { |
| super.pageActivated(page); |
| updateActiveEditor(); |
| updateState(); |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PageEventAction. |
| */ |
| public void pageClosed(IWorkbenchPage page) { |
| super.pageClosed(page); |
| updateActiveEditor(); |
| updateState(); |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PartEventAction. |
| */ |
| public void partActivated(IWorkbenchPart part) { |
| super.partActivated(part); |
| if (part instanceof IEditorPart) { |
| updateActiveEditor(); |
| updateState(); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PartEventAction. |
| */ |
| public void partBroughtToTop(IWorkbenchPart part) { |
| super.partBroughtToTop(part); |
| if (part instanceof IEditorPart) { |
| updateActiveEditor(); |
| updateState(); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PartEventAction. |
| */ |
| public void partClosed(IWorkbenchPart part) { |
| super.partClosed(part); |
| if (part instanceof IEditorPart) { |
| updateActiveEditor(); |
| updateState(); |
| } |
| } |
| |
| /* (non-Javadoc) |
| * Method declared on PartEventAction. |
| */ |
| public void partDeactivated(IWorkbenchPart part) { |
| super.partDeactivated(part); |
| if (part instanceof IEditorPart) { |
| updateActiveEditor(); |
| updateState(); |
| } |
| } |
| |
| /** |
| * Set the active editor |
| */ |
| private void setActiveEditor(IEditorPart part) { |
| if (activeEditor == part) { |
| return; |
| } |
| if (activeEditor != null) { |
| editorDeactivated(activeEditor); |
| } |
| activeEditor = part; |
| if (activeEditor != null) { |
| editorActivated(activeEditor); |
| } |
| } |
| |
| /** |
| * Update the active editor based on the current |
| * active page. |
| */ |
| private void updateActiveEditor() { |
| if (getActivePage() == null) { |
| setActiveEditor(null); |
| } else { |
| setActiveEditor(getActivePage().getActiveEditor()); |
| } |
| } |
| |
| /** |
| * Update the state of the action. By default, the action |
| * is enabled if there is an active editor. |
| * |
| * Subclasses may override or extend this method. |
| */ |
| protected void updateState() { |
| setEnabled(getActiveEditor() != null); |
| } |
| |
| } |