Using JavaFX UI Controls 18 Hyperlinks

Original page address: Http://docs.oracle.com/javafx/2/ui_controls/hyperlink.htm#CIHGADBG

This chapter describes the components used to convert text to hyperlinks Hyperlink

HyperlinkA class is another form of the labeled class.

Figure 18-1 shows the 3 state of the default hyperlink implementation

Figure 18-1 The 3 state of the hyperlink component

Create a hyperlink

Example 18-1 shows the code snippet that created the hyperlink

<em> example 18-1 Typical hyperlink </em>hyperlink link = new Hyperlink (); Link.settext ("http://example.com"); Link.setonaction (New eventhandler<actionevent> () {    @Override public    void handle (ActionEvent e) {        SYSTEM.OUT.PRINTLN ("This link is clicked");    });

settext   Member method to define the title of the hyperlink.

because   Hyperlink   class is an extension of the labeled class, you can set a specific font and text for the title.

< Span style= "Color:rgb (51,51,51); Font-family:verdana,arial,helvetica,sans-serif; Font-weight:bold; line-height:19.2000007629395px "> setonaction   method is used to specify the behavior of hyperlinks when clicked. Similar to The onaction action of the button.

Example 18-1, in which behavior is limited to printing strings. But in your app, you might want to use it for more common tasks.

Link Local content

Render a picture from a local directory in the show app in Figure 18-2

Figure 18-2 Displaying the picture

Show Example Source code for 18-2 :

Example 18-2 Browse pictures with hyperlinks

Import Javafx.application.application;import Javafx.event.actionevent;import Javafx.event.eventhandler;import Javafx.scene.*;import Javafx.scene.control.*;import Javafx.scene.image.image;import Javafx.scene.image.ImageView; Import Javafx.scene.layout.vbox;import javafx.stage.Stage;        public class Main extends application {final static string[] imagefiles = new string[]{"Product.png",    "Education.png", "Partners.png", "Support.png"};    Final static string[] captions = new string[]{"Products", "Education", "Partners", "support"    };    Final ImageView selectedimage = new ImageView ();    Final ScrollPane list = new ScrollPane ();    Final hyperlink[] Hpls = new Hyperlink[captions.length];     Final image[] images = new Image[imagefiles.length];    public static void Main (string[] args) {application.launch (args);        } @Override public void start (stage stage) {Scene scene = new Scene (new Group ());Stage.settitle ("Hyperlink Sample");        Stage.setwidth (300);         Stage.setheight (200);        SELECTEDIMAGE.SETLAYOUTX (100);         Selectedimage.setlayouty (10);            for (int i = 0; i < captions.length; i++) {final Hyperlink HPL = hpls[i] = new Hyperlink (captions[i]);            Final image image = Images[i] = new Image (GetClass (). getResourceAsStream (Imagefiles[i])            ); Hpl.setonaction (New eventhandler<actionevent> () {@Override public void handle (Actione                Vent e) {selectedimage.setimage (image);        }            });        Final button button = New button ("Refresh links"); Button.setonaction (New eventhandler<actionevent> () {@Override public void handle (ACTI OnEvent e) {for (int i = 0; i < captions.length; i++) {hpls[i].setvisited (f                        Alse); SeLectedimage.setimage (NULL);         }                }            });        VBox VBox = new VBox ();        Vbox.getchildren (). AddAll (HPLS);        Vbox.getchildren (). Add (button);         Vbox.setspacing (5);        (Group) Scene.getroot ()). GetChildren (). AddAll (VBox, selectedimage);        Stage.setscene (Scene);    Stage.show (); }}<em></em>

The program creates 4 Hyperlink through a for loop, and the user clicks on a link that will trigger this hyperlink setOnAction 方法里定义的行为的动作。 so the corresponding picture in the image array is set to selectedImage variable. When the user clicks on a hyperlink, the hyperlink appears to be visited. You can setVisited Refresh the hyperlink by calling the method.

Example 18-3 code snippet that implements the task.

Example 18-3 Refresh Hyperlinks

Final button button = New button ("Refresh links"); Button.setonaction (new eventhandler<actionevent> () {    @ Override public    void handle (ActionEvent e) {for       (int i = 0; i < captions.length; i++) {           hpls[i].setvisited (false);           Selectedimage.setimage (null);}}    );

is 18-3 shown, when clicked when the button is refreshed, all hyperlinks are set to an inaccessible state.

Figure 18-3 Hyperlinks that have not been visited

because Hyperlink class expands from Labeled class, you can not only specify the caption text but also set a picture for it. The next section of the program will show both using captions and using pictures to create hyperlinks and load remote HTML pages.

Link Remote content

javafx program, by embedding webview   browser component to render HTML content. webview &NBSP; component provides basic functionality for browsing Web pages. The component can render Web pages that support user and link interaction, or you can execute javascript code.

Learning Example 18-4 the source code. It created 4 hyperlinks with captions and pictures. When you click on one of the hyperlinks, the corresponding value is passed to the Mosaicked browser as a URL .

Example 18-4 loading Remote Web pages

Import Javafx.application.application;import Javafx.event.actionevent;import Javafx.event.eventhandler;import Javafx.scene.*;import Javafx.scene.control.*;import Javafx.scene.image.image;import Javafx.scene.image.ImageView; Import Javafx.scene.layout.hbox;import Javafx.scene.layout.priority;import Javafx.scene.layout.vbox;import Javafx.scene.text.font;import Javafx.scene.web.webengine;import Javafx.scene.web.webview;import Javafx.stage.Stage;        public class Main extends application {final static string[] imagefiles = new string[]{"Product.png",    "Education.png", "Partners.png", "Support.png"};    Final static string[] captions = new string[]{"Products", "Education", "Partners", "support"     }; Final static string[] urls = new string[]{"http://www.oracle.com/us/products/index.html", "http://education . oracle.com/"," http://www.oracle.com/partners/index.html "," http://www.oracle.com/us/support/Index.html "};    Final ImageView selectedimage = new ImageView ();    Final hyperlink[] Hpls = new Hyperlink[captions.length];        Final image[] images = new Image[imagefiles.length];    public static void Main (string[] args) {launch (args);        } @Override public void start (stage stage) {VBox VBox = new VBox ();        Scene scene = new Scene (VBox);        Stage.settitle ("Hyperlink Sample");        Stage.setwidth (570);         Stage.setheight (550);        SELECTEDIMAGE.SETLAYOUTX (100);                Selectedimage.setlayouty (10);        Final WebView browser = new WebView ();         Final Webengine webengine = Browser.getengine ();             for (int i = 0; i < captions.length; i++) {final Hyperlink HPL = hpls[i] = new Hyperlink (captions[i]);            Final image image = Images[i] = new Image (GetClass (). getResourceAsStream (Imagefiles[i]));            Hpl.setgraphic (new ImageView (image)); Hpl.setfont (Font.font ("ARial ", 14));             Final String url = urls[i]; Hpl.setonaction (New eventhandler<actionevent> () {@Override public void handle (Actione                Vent e) {webengine.load (URL);        }            });        } HBox HBox = new HBox ();         Hbox.getchildren (). AddAll (HPLS);        Vbox.getchildren (). AddAll (Hbox, browser);                Vbox.setvgrow (browser, priority.always);        Stage.setscene (Scene);    Stage.show (); }}

similar examples 18-2 hyperlink through for loop to create. Sets the behavior of the hyperlink to the URL array corresponding to the URLs that are nested in the browser WebEngine object .

when the program is compiled and run, the program form displays 18-4 the situation.

Figure 18-4 from Oracle company URL Loading page

Using JavaFX UI Controls 18 Hyperlinks