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完成这些更改后，如果不输入 Title 值，向导将提供错误消息。此外，Finish 按钮将被禁用，直至为 Title 指定了值为止。通过使用先前概述的步骤运行插件项目来检验此功能。
添加自定义内容
向导页面 NewXHTMLFileWizardPage 现在将捕捉用户输入的 HTML 标题的值，但是它尚未把该值合并到文件中。要开始将该值添加到文件中，首先需要编辑 index-xhtml-template.resource 文件使其包含该值的占位符。您可以将 <title> 元素更改为 <title>${title}</title>，这样可以更轻松地包含占位符。
修改 performFinish() 方法以从向导页面获得标题并将标题传递给 doFinish() 方法以及其余值。
清单 13. 最终的 performFinish() 方法 /**
* This method is called when 'Finish' button is pressed in the wizard. We
* will create an operation and run it using wizard as execution context.
*/
public boolean performFinish() {
final String containerName = page.getContainerName();
final String fileName = page.getFileName();
final String title = page.getTitle();
IRunnableWithProgress op = new IRunnableWithProgress() {
public void run(IProgressMonitor monitor)
throws InvocationTargetException {
try {
doFinish(containerName, fileName, title, monitor);
} catch (CoreException e) {
throw new InvocationTargetException(e);
} finally {
monitor.done();
}
}
};
try {
getContainer().run(true, false, op);
} catch (InterruptedException e) {
return false;
} catch (InvocationTargetException e) {
Throwable realException = e.getTargetException();
MessageDialog.openError(getShell(), "Error", realException
.getMessage());
return false;
}
return true;
}
接下来，略微修改 doFinish() 方法使其接受标题作为参数并将其传递给 openContentStream() 方法。
清单 14. 接受标题作为参数的最终 doFinish() 方法 /**
* The worker method. It will find the container, create the file if missing
* or just replace its contents, and open the editor on the newly created
* file.
*/
private void doFinish(String containerName, String fileName, String title,
IProgressMonitor monitor) throws CoreException {
monitor.beginTask("Creating " + fileName, 2);
IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
IResource resource = root.findMember(new Path(containerName));
if (!resource.exists() || !(resource instanceof IContainer)) {
throwCoreException("Container "" + containerName
+ "" does not exist.");
}
IContainer container = (IContainer) resource;
final IFile file = container.getFile(new Path(fileName));
try {
InputStream stream = openContentStream(title);
try {
if (file.exists()) {
file.setContents(stream, true, true, monitor);
} else {
file.create(stream, true, monitor);
}
} finally {
stream.close();
}
} catch (IOException e) {
}
monitor.worked(1);
monitor.setTaskName("Opening file for editing...");
getShell().getDisplay().asyncExec(new Runnable() {
public void run() {
IWorkbenchPage page = PlatformUI.getWorkbench()
.getActiveWorkbenchWindow().getActivePage();
try {
IDE.openEditor(page, file, true);
} catch (PartInitException e) {
}
}
});
monitor.worked(1);
}
(编辑:aniston)
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