检测WebView中的超链接悬停并打印链接 [英] Detect Hyperlink hover in WebView and print the link

问题描述

我想从WebView添加悬停的超链接并将其显示在角落中。

I want to add the hovered Hyperlink from a WebView and display it in a corner.

我如何实现？它应该像Chromes功能：

How can i achieve? It should be like Chromes feature:

示例 - Chrome-Screenshot

Example-Chrome-Screenshot

包含许多链接的示例WebView代码：

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.ScrollPane;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javafx.stage.Stage;

public class core extends Application {
    @Override
    public void start(final Stage stage) {
        Scene scene = new Scene(new Group());

        final WebView browser = new WebView();
        final WebEngine webEngine = browser.getEngine();

        ScrollPane scrollPane = new ScrollPane();
        scrollPane.setContent(browser);

        webEngine.load("http://java2s.com");

        scene.setRoot(scrollPane);

        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

推荐答案

首先事情 - 你的场景应该包含多个元素，而不仅仅是 ScrollPane 。您需要一个 TextField 来显示超链接的内容，这两个 Control 应放在某种窗格上。
要在鼠标移过超链接时处理显示内容，您需要获取所有超链接类型的节点，然后为它们添加适当的侦听器。

First thing - your Scene should contain more than one element, not only the ScrollPane. You need a TextField to show hyperlinks' content and these two Controls should be placed on some kind of a Pane. To handle displaying the content when your mouse goes over the hyperlink, you need to get all the nodes, which are of a hyperlink type, and then add proper listeners to them.

查看下面的代码，它可以实现您想要实现的目标（部分基于'灵感与表达'博客中的'JavaFX WebView addHyperlinkListener'文章：

Look at the code below, it does what you would like to achieve (it's partially based on the 'JavaFX WebView addHyperlinkListener' article from the 'Inspiration and Expression' blog):

public class Main extends Application {

  @Override
  public void start(final Stage stage) {
    Scene scene = new Scene(new Group());

    final WebView browser = new WebView();
    final WebEngine webEngine = browser.getEngine();

    ScrollPane scrollPane = new ScrollPane();
    scrollPane.setContent(browser);

    TextField textField = new TextField();
    textField.setVisible(false);
    textField.setEditable(false);

    webEngine.getLoadWorker().stateProperty().addListener((observable, oldValue, newValue) -> {
      if (newValue == Worker.State.SUCCEEDED) {

        EventListener mouseOverEventListener = new EventListener() {
          @Override
          public void handleEvent(Event ev) {
            String href = ((Element) ev.getTarget()).getAttribute("href");
            textField.setText(href);
            textField.setVisible(true);
            textField.setPrefWidth(textField.getText().length() * 6); //
            System.out.println(href);
          }
        };

        EventListener mouseOutEventListener = new EventListener() {
          @Override
          public void handleEvent(Event ev) {
            textField.setVisible(false);
          }
        };

        Document document = webEngine.getDocument();
        NodeList nodeList = document.getElementsByTagName("a");
        for (int i = 0 ; i < nodeList.getLength() ; i++) {
          ((EventTarget) nodeList.item(i)).addEventListener("mouseover",mouseOverEventListener,false);
          ((EventTarget) nodeList.item(i)).addEventListener("mouseout",mouseOutEventListener,false);
        }
      }
    });

    String content = "http://java2s.com";
    webEngine.load(content);

    AnchorPane anchorPane = new AnchorPane();
    anchorPane.getChildren().add(scrollPane);
    anchorPane.getChildren().add(textField);
    AnchorPane.setBottomAnchor(textField, 0.0);
    AnchorPane.setLeftAnchor(textField, 0.0);

    scene.setRoot(anchorPane);
    stage.setScene(scene);
    stage.show();
  }

  public static void main(String[] args) {
    launch(args);
  }
}

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