在JavaFX WebView加载页面之前显示加载图像

Question

我在桌面应用程序中使用JavaFX 2.2,并且我实现了WebView组件.我从桌面应用程序中加载了www.google.com.问题是我希望在页面加载之前显示.gif图像.现在,它显示一个白色屏幕,然后显示页面.有办法做到这一点吗？提前致谢.

Answer 1

您可以收听WebEngine#loadWorker.stateProperty并在上面显示动画GIF,WebView直到加载准备就绪.

更好的是,恕我直言,将听取WebEngine#loadWorker.progressProperty并向用户显示真正的加载进度.

    StackPane root = new StackPane();
    final ProgressBar progress = new ProgressBar(); // or you can use ImageView with animated gif instead

    WebView webView = new WebView();
    root.getChildren().addAll(webView, progress);
    final WebEngine engine = webView.getEngine();
    engine.load("http://stackoverflow.com/questions/14094264/display-loading-image-before-javafx-webview-loads-the-page");

    // updating progress bar using binding
    progress.progressProperty().bind(engine.getLoadWorker().progressProperty());

    engine.getLoadWorker().stateProperty().addListener(
            new ChangeListener<State>() {
                @Override
                public void changed(ObservableValue ov, State oldState, State newState) {
                    if (newState == State.SUCCEEDED) {
                         // hide progress bar then page is ready
                         progress.setVisible(false);
                    }
                }
            });


    Scene scene = new Scene(root, 500, 500);
    primaryStage.setScene(scene);
    primaryStage.show();