Question

我正在尝试自定义Eclipse 3.8.1上的Help-＆gt; About菜单项。我尝试了两种3.x友好方法，因为Eclipse 4.0的工作方式不同。

---＆GT;我尝试扩展AboutAction本身（org.eclipse.ui.internal.dialogs.AboutDialog），这样我就可以在DialogArea Text中添加一行，并在单击License按钮时添加一个可滚动的Dialog Gui。但是所有方法都受到保护。 API我看到它说用户可以使用但不能覆盖（与Dialog类相同）

---＆GT;我尝试扩展默认的AbstractHandler，在execute方法中我创建了一个Dialog对象，我基本上想要逐个添加所有需要的东西。唯一的问题是我无法处理execute方法中的Dialog对象，因为它在execute方法结束之前仍然是一个空引用，因此如果没有nullPointerException使我烦恼，我就无法添加它。

---＆GT;我还尝试将<property>添加到plugin.xml本身。这似乎是一个4.x功能。 about菜单下的description字段也无法在About对话框文本区域中写入文本

    @SuppressWarnings("restriction")
    public class AboutActionStableHandler extends AbstractHandler {

public Object execute(ExecutionEvent event) throws ExecutionException 
{
    helpDialog = new AboutDialog(HandlerUtil.getActiveShellChecked(event));
    helpDialog.open();
    //helpDialog.getDialogArea(); 
    Shell aboutShell = helpDialog.getShell(); 
    aboutShell.setLayout(new GridLayout());
    Label version = new Label(aboutShell, SWT.NONE);
    version.setText(Platform.getProduct().getDefiningBundle().getVersion().toString());
    version.setLayoutData(GridDataBuilder.create().
    grabExcessHorizontalSpace(true).
    widthHint(500).
    heightHint(5).
    horizontalAlignment(SWT.FILL).build());
    return null;
}

所以当我点击about Gui时，我最终得到了这个运行时错误 java.lang.NullPointerException at com.magic.gui.commands.AboutActionStableHandler.execute(AboutActionStableHandler.java:28) at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:290) at org.eclipse.core.commands.Command.executeWithChecks(Command.java:499) at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508) at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169) at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:241) at org.eclipse.ui.menus.CommandContributionItem.handleWidgetSelection(CommandContributionItem.java:829) at org.eclipse.ui.menus.CommandContributionItem.access$19(CommandContributionItem.java:815) at org.eclipse.ui.menus.CommandContributionItem$5.handleEvent(CommandContributionItem.java:805) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at com.magic.rcp.Application.start(Application.java:87) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) at org.eclipse.equinox.launcher.Main.run(Main.java:1438) at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

Answer 1

调用helpDialog.create()会显示该对话框，直到它被修改时才会关闭。

您可以致电open()创建对话框，稍后再致电AboutDialog。

但是 AboutDialog是内部类，试图修改它，因为这违反了Eclipse API Rules of Engagement这就是为什么你不得不压制限制警告。 trix_editor无法正式修改。如果你想要一个不同的对话框，你应该写自己的对话框。

如何在Eclipse 3.8.1 RCP应用程序的“帮助”菜单下自定义“关于”条目的文本和按钮

1 个答案: