RCP学习：如何重写WorkbenchPage

重写WorkbenchPage的必要性在哪里？

比如有一个需求，比如屏蔽编辑器的关闭功能，或者把关闭编辑器按钮的实际功能转为隐藏编辑器

前一个功能还可以通过重写一系列的类来完成，后面这个功能几乎是无法完成的。

 

我们可以通过扩展org.eclipse.ui.internalTweaklets来完成

我们来看WorkbenchPage的初始化是怎样的：

/******************************************************************************* * Copyright (c) 2008 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.tweaklets;import org.eclipse.core.runtime.IAdaptable;import org.eclipse.ui.WorkbenchException;import org.eclipse.ui.internal.Perspective;import org.eclipse.ui.internal.WorkbenchPage;import org.eclipse.ui.internal.WorkbenchWindow;import org.eclipse.ui.internal.registry.PerspectiveDescriptor;/** * @since 3.4 * */public class Workbench3xImplementation extends WorkbenchImplementation {    /* (non-Javadoc)     * @see org.eclipse.ui.internal.tweaklets.WorkbenchImplementation#createWBW(int)     */    public WorkbenchWindow createWorkbenchWindow(int newWindowNumber) {        return new WorkbenchWindow(newWindowNumber);    }    /* (non-Javadoc)     * @see org.eclipse.ui.internal.tweaklets.WorkbenchImplementation#createWBPage(org.eclipse.ui.internal.WorkbenchWindow, java.lang.String, org.eclipse.core.runtime.IAdaptable)     */    public WorkbenchPage createWorkbenchPage(WorkbenchWindow workbenchWindow,            String perspID, IAdaptable input) throws WorkbenchException {        return new WorkbenchPage(workbenchWindow, perspID, input);    }    /* (non-Javadoc)     * @see org.eclipse.ui.internal.tweaklets.WorkbenchImplementation#createWBPage(org.eclipse.ui.internal.WorkbenchWindow, org.eclipse.core.runtime.IAdaptable)     */    public WorkbenchPage createWorkbenchPage(WorkbenchWindow workbenchWindow,            IAdaptable finalInput) throws WorkbenchException {        return new WorkbenchPage(workbenchWindow, finalInput);    }    /* (non-Javadoc)     * @see org.eclipse.ui.internal.tweaklets.WorkbenchImplementation#createPerspective(org.eclipse.ui.internal.registry.PerspectiveDescriptor, org.eclipse.ui.internal.WorkbenchPage)     */    public Perspective createPerspective(PerspectiveDescriptor desc,            WorkbenchPage workbenchPage) throws WorkbenchException {        return new Perspective(desc, workbenchPage);    }}

 

该类不止负责WorkbenchPage生成，重写WorkbenchWindow，重写Perspective也可以通过它。

这个类是可以通过扩展点配置出来的，见代码节选：

public abstract class WorkbenchImplementation {    public static TweakKey KEY = new Tweaklets.TweakKey(WorkbenchImplementation.class);    static {        Tweaklets.setDefault(WorkbenchImplementation.KEY, new Workbench3xImplementation());    }}

 

private static Object createTweaklet(TweakKey definition) {        IConfigurationElement[] elements = Platform                .getExtensionRegistry()                .getConfigurationElementsFor("org.eclipse.ui.internalTweaklets"); //$NON-NLS-1$        for (int i = 0; i < elements.length; i++) {            if (definition.tweakClass.getName().equals(                    elements[i].getAttribute("definition"))) { //$NON-NLS-1$                try {                    Object tweaklet = elements[i].createExecutableExtension("implementation"); //$NON-NLS-1$                    tweaklets.put(definition, tweaklet);                    return tweaklet;                } catch (CoreException e) {                    StatusManager.getManager().handle(                            StatusUtil.newStatus(IStatus.ERROR,                                    "Error with extension " + elements[i], e), //$NON-NLS-1$                            StatusManager.LOG);                }            }        }        return null;    }

我现在实现一个自己的WorkbenchImplementation，如下

package galaxy.ide.application.test;import org.eclipse.core.runtime.IAdaptable;import org.eclipse.ui.IEditorReference;import org.eclipse.ui.WorkbenchException;import org.eclipse.ui.internal.WorkbenchPage;import org.eclipse.ui.internal.WorkbenchWindow;import org.eclipse.ui.internal.tweaklets.Workbench3xImplementation;public class MyWorkbenchImplementation extends Workbench3xImplementation {    public MyWorkbenchImplementation() {        super();    }    public WorkbenchPage createWorkbenchPage(WorkbenchWindow workbenchWindow,            String perspID, IAdaptable input) throws WorkbenchException {        return new WorkbenchPage(workbenchWindow, perspID, input) {            public boolean closeEditors(IEditorReference[] refArray,                    boolean save) {                System.out.println("执行关闭！！！！");                return super.closeEditors(refArray, save);            }        };    }    /*     * (non-Javadoc)     *      * @see     * org.eclipse.ui.internal.tweaklets.WorkbenchImplementation#createWBPage     * (org.eclipse.ui.internal.WorkbenchWindow,     * org.eclipse.core.runtime.IAdaptable)     */    public WorkbenchPage createWorkbenchPage(WorkbenchWindow workbenchWindow,            IAdaptable finalInput) throws WorkbenchException {        return new WorkbenchPage(workbenchWindow, finalInput) {            public boolean closeEditors(IEditorReference[] refArray,                    boolean save) {                System.out.println("执行关闭！！！！");                return super.closeEditors(refArray, save);            }        };    }}

为了让该类执行，扩展点定义如下：

<extension         point="org.eclipse.ui.internalTweaklets">      <tweaklet            definition="org.eclipse.ui.internal.tweaklets.WorkbenchImplementation"            description="galaxy.ide.application.test.MyWorkbenchImplementation"            id="galaxy.ide.application.test.my"            implementation="galaxy.ide.application.test.MyWorkbenchImplementation"            name="galaxy.ide.application.test.MyWorkbenchImplementation">      </tweaklet>   </extension>

如此，即可。