即使禁用上载组件，单击后仍会打开对话

Question

我正在使用Vaadin框架开发一个web应用程序。

我正在使用Vaadin上传组件。为了方便起见，我们决定在文件已经上传到服务器时禁用上传按钮。

问题是，这个按钮看起来是禁用的，但点击它时，它仍然会打开文件浏览器对话，让用户指定无法正确处理的其他文件。

   //The first listener triggered when starting an upload, here the 
   // Upload component is set to disabled
    upload.addListener(new Upload.StartedListener() {
                public void uploadStarted(StartedEvent event) {
                    // this method gets called immediately after upload is started

                    upload.setEnabled(false);
    }

    // Listener being triggered a number of times during the upload. 
    // Here is where I debugged, saw that the Upload component was 
    // disabled but found that I still could open the dialogue. 
            upload.addListener(new Upload.ProgressListener() {
                public void updateProgress(long readBytes, long contentLength) {

    }

    // The last listener triggered, here the Upload component is 
    // set to enabled. The button now looks clickable but it behaves 
    // the same way as it does when the Upload component is disabled.
    upload.addListener(new Upload.FinishedListener() {
                public void uploadFinished(FinishedEvent event) {
                    if(uploadOk){
                        fileListItem.getProgressIndicator().stopPolling();
                        fileListItem.removeProgressIndicator();
                        fileListItem.removeAbortButton();
                        submitFilesBt.setEnabled(true);
                        removeFilesBt.setEnabled(true);
                        fileListItem.setFile(counter.getFile());
                        upload.setEnabled(true);                }
                }
            });

Answer 1

我从未设法解决组件的问题，但我通过将上载组件放在一个专用容器中解决了这个问题。当我启动上传时，我从容器中移除了组件，而是插入了一个虚拟的replace按钮，该按钮看起来相同，但已被禁用。上传完成后，我删除了虚拟按钮，并再次添加了上传按钮。

使用这种方法可以避免这个问题，但如果有人认为这是一个相当粗略的解决问题的方法，我会同意。