How to upgrade the style sheets when running?

Strangely the style does'nt changes if I manually change the rules of css class in one of the css document and switch between the 2 files.

@Override

Public Sub initialize (URL url, rb ResourceBundle) {}

final String cssUrl1 = getClass().getResource("/tracker/view/fxmlgui1.css").toExternalForm ();

final String cssUrl2 = getClass().getResource("/tracker/view/fxmlgui2.css").toExternalForm ();

rootPane.getStylesheets () .add (cssUrl1);

rootPane.addEventHandler (KeyEvent.KEY_PRESSED, new EventHandler < KeyEvent > () {}

@Override

{} public void handle (KeyEvent keyEvent)

If (keyEvent.getCode () .equals (KeyCode.DIGIT1)) {}

rootPane.getStylesheets () .clear ();

rootPane.getStylesheets () .add (cssUrl1);

msgLabel.setText ("Css1 selected.");

} ElseIf (keyEvent.getCode () .equals (KeyCode.DIGIT2)) {}

rootPane.getStylesheets () .clear ();

rootPane.getStylesheets () .add (cssUrl2);

msgLabel.setText ("Css2 selected.");

}

});

}

The event occurs and the style change of css1 and css2, as it was at the scene is rendered, but if I change one of the rules in the sylesheets after step is planned, the does'nt lifestyle changes more.

So who is the General method to change the style of nodes change the css document at run time?

It's like the original stylesheets in css documents someway implemented cache and does'nt update to any switch.

Is the purpose of being able to edit the css file, and then press a key or press a button "recharge style" on the user interface and see the models updated? I don't think that's really the purpose of the css style: intent is really that the css file that will be provided in the your application jar file and never even extracted, both and edited and reloaded. (It can even be converted to a binary format that is faster to load).

That said, however, the following works fine for me. (JDK 1.7.0_25, JavaFX 2.2.25). Run the application, you see the label in blue. Edit the css and save (without leaving the app), press the button reload the style, and you see all changes take effect. Who does not work for you?

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class CssReloader extends Application {

 @Override
  public void start(Stage primaryStage) {
  final VBox root = new VBox(5);
  final Button reloadButton = new Button("Reload style");
  reloadButton.setOnAction(new EventHandler() {
            @Override
            public void handle(ActionEvent event) {
                loadStyle(root);
            }
        });
  final Label label = new Label("A message");
  root.getChildren().addAll(reloadButton, label);
  loadStyle(root);
  primaryStage.setScene(new Scene(root, 300, 150));
  primaryStage.show();
  }

  private void loadStyle(Parent node) {
      node.getStylesheets().clear();
      node.getStylesheets().add(getClass().getResource("editMe.css").toExternalForm());
  }

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

editMe.css:


@CHARSET "UTF-8";
.label {
 -fx-text-fill: blue ;
}

Update: of course, this code will not work if you combine this as a jar file and run it from there. getClass () .getResource (name) produces a URL that represents a resource loaded from the same location as the class underway (in this case the jar file), and toExternalForm() that allows to convert to a string. Of course to edit a css won't help in the bundled jar file. (Try to view as follows. Launched from a file system class loader, you will get a file:// url; launched from a jar class loader, you will get a pot: / / class loader.)

private void loadStyle(Parent node) {
      node.getStylesheets().clear();
     String resource = getClass().getResource("editMe.css").toExternalForm() ;
     System.out.println(resource);
      node.getStylesheets().add(resource);
  }

To force a system file URL, even if you run from a jar file, you can do this:

privatevoid loadStyle(Parent node) {
      node.getStylesheets().clear();
      try {
            final String resource = Paths.get("/path/to/editMe.css").toUri().toURL().toExternalForm();
            System.out.println(resource);
            node.getStylesheets().add(resource);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
  }

Now, of course you have something of a headache of deployment; you will need to make sure somehow that there is a css file in the correct location - outside packaging jar - as part of the deployment of your application. You can check for its existence at startup, and if she's not here read a default version of your jar file and write it in the location in which you expect to find; or find another strategy.

Post edited by: James_D

Tags: Java

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