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Javafx 8 using KeyEvents with ImageView


Javafx 8 using KeyEvents with ImageView

By : Matrix1690
Date : November 17 2020, 11:58 AM
it fixes the issue Key events are only generated by scene graph nodes when they have keyboard focus. By default, an ImageView does not gain keyboard focus. You need to call
code :
setFocusTraversable(true);


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JavaFX. How to make the border of imageview, when I click the imageview?

JavaFX. How to make the border of imageview, when I click the imageview?


By : Okan Y.
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Well you will need:
a PseudoClass for toggling the CSS state a wrapping Region, because the ImageView itself does neither support a background nor a border.
code :
@Override
public void start(Stage primaryStage) {

    PseudoClass imageViewBorder = PseudoClass.getPseudoClass("border");

    ImageView imageview = new ImageView(
            new Image("http://upload.wikimedia.org/wikipedia/commons/1/16/Appearance_of_sky_for_weather_forecast,_Dhaka,_Bangladesh.JPG"));

    BorderPane imageViewWrapper = new BorderPane(imageview);
    imageViewWrapper.getStyleClass().add("image-view-wrapper");

    BooleanProperty imageViewBorderActive = new SimpleBooleanProperty() {
        @Override
        protected void invalidated() {
            imageViewWrapper.pseudoClassStateChanged(imageViewBorder, get());
        }
    };

    imageview.setOnMouseClicked(ev -> imageViewBorderActive
            .set(!imageViewBorderActive.get()));

    BorderPane root = new BorderPane(imageViewWrapper);
    root.setPadding(new Insets(15));

    Scene scene = new Scene(root, 700, 400);
    scene.getStylesheets().add(
            getClass().getResource("application.css").toExternalForm());
    primaryStage.setScene(scene);
    primaryStage.show();
}
.image-view-wrapper:border {
    -fx-border-color: black;
    -fx-border-style: solid;
    -fx-border-width: 5;
}
React on User Keyevents whitout laggs JavaFx

React on User Keyevents whitout laggs JavaFx


By : Mus'id Bin Malik
Date : October 20 2020, 03:08 PM
fixed the issue. Will look into that further So, OnKeyPressed fires when a key is first pressed and then every second or so after. If you want something to happen continuously, instead of having it happen when the OnKeyPressed event fires, consider having OnKeyPressed and OnKeyReleased control some sort of boolean keyIsPressed, and using that in a while loop of some sort. So OnKeyPressed would set keyIsPressed=true and OnKeyReleased would do the opposite
KeyEvents not firing in Javafx

KeyEvents not firing in Javafx


By : mike_lippy
Date : March 29 2020, 07:55 AM
Any of those help Give this a shot I added this line view.setOnMouseClicked(event -> view.requestFocus());
code :
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage stage) {
        StackPane view = new StackPane();
        view.setPrefSize(200,200);
        view.setOnMouseClicked(event -> view.requestFocus());
        view.setOnKeyPressed(event -> {
            switch (event.getCode().toString()) {
                case "UP":
                    event.consume();
                    System.out.println("UP");
//                        model.tryMove(Richting.OMHOOG);
                    break;
                case "DOWN":
                    event.consume();
                    System.out.println("DOWN");
//                        model.tryMove(Richting.LINKS);
                    break;
                case "LEFT":
                    event.consume();
                    System.out.println("LEFT");
//                        model.tryMove(Richting.LINKS);
                    break;
                case "RIGHT":
                    event.consume();
                    System.out.println("RIGHT");
//                        model.tryMove(Richting.RECHTS);
                    break;
            }
//                model.checkDone();
        });


        Scene scene = new Scene(view);

        stage = new Stage();
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) { launch(args); }
}
JavaFX KeyEvents during Drag & Drop operation

JavaFX KeyEvents during Drag & Drop operation


By : Subeer Rangra
Date : March 29 2020, 07:55 AM
this one helps. Hope I understand your question here is a possible solution(work with any key):
code :
public class Main extends Application {
    SimpleBooleanProperty isKeyPress = new SimpleBooleanProperty(false);
    @Override
    public void start(Stage primaryStage) throws Exception{
        Parent window = new VBox();
        ((VBox) window).getChildren().add(new Label("example of small window:"));
        primaryStage.setTitle("example");
        Scene scene=new Scene(window);
        primaryStage.setScene(scene);
        primaryStage.show();
        scene.setOnKeyPressed(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                System.out.println("Press");
                isKeyPress.set(true);
                Alert alert = new Alert(Alert.AlertType.INFORMATION);
                alert.setTitle("Information Dialog");
                alert.setHeaderText(null);
                alert.setContentText("I have a great message for you!");
                Scene alertScene = alert.getDialogPane().getScene();
                alertScene.setOnKeyReleased(new EventHandler<KeyEvent>() {
                    @Override
                    public void handle(KeyEvent event) {
                        System.out.println("Released on dialog");
                        isKeyPress.set(false);

                    }
                });
                alert.showAndWait();
            }
        });
        scene.setOnKeyReleased(new EventHandler<KeyEvent>() {
            @Override
            public void handle(KeyEvent event) {
                System.out.println("Released");
                isKeyPress.set(false);
            }
        });
    }

    public static void main(String[] args) {
        launch(args);
    }
}
Press
Released on dialog
JavaFx: TextField KeyEvents are not triggered

JavaFx: TextField KeyEvents are not triggered


By : patefilo
Date : March 29 2020, 07:55 AM
I wish this helpful for you The reason that the textField doesn't react to some/all "standard function keys" is that their KEY_PRESSED type never reaches it - they are redirected to the table in the popup and most/all of them consumed by the table.
A naive first approximation would be to set the table's focusTraversable property to false: this effectively prevents all keys from being delivered to it. Real-world requirements might be a bit less simplistic, in that some of those should reach the table while others should bubble up to the textField.
code :
private BasicEventDispatcher original;
private Predicate<Event> interceptor;

@Override
public Event dispatchEvent(Event event, EventDispatchChain tail) {
    if (!interceptor.test(event)) {
        event = original.dispatchCapturingEvent(event);
        if (event.isConsumed()) {
            return null;
        }
    }
    event = tail.dispatchEvent(event);
    if (event != null && !interceptor.test(event)) {
        event = original.dispatchBubblingEvent(event);
        if (event.isConsumed()) {
            return null;
        }
    }
    return event;
}
List<KeyCode> toIntercept = List.of(KeyCode.LEFT, KeyCode.RIGHT);
Predicate<Event> interceptor = e -> {
    if (e instanceof KeyEvent) {
        return toIntercept.contains(((KeyEvent) e).getCode());
    }
    return false;
};
table.setEventDispatcher(new InterceptingEventDispatcher(
        (BasicEventDispatcher) table.getEventDispatcher(), interceptor));
public class ViewPopupApplication extends Application {

    public static class InterceptingEventDispatcher implements EventDispatcher {
        private BasicEventDispatcher original;
        private Predicate<Event> interceptor;

        public InterceptingEventDispatcher(BasicEventDispatcher original, Predicate<Event> interceptor) {
            this.original = original;
            this.interceptor = interceptor;
        }

        @Override
        public Event dispatchEvent(Event event, EventDispatchChain tail) {
            if (!interceptor.test(event)) {
                event = original.dispatchCapturingEvent(event);
                if (event.isConsumed()) {
                    return null;
                }
            }
            event = tail.dispatchEvent(event);
            if (event != null && !interceptor.test(event)) {
                event = original.dispatchBubblingEvent(event);
                if (event.isConsumed()) {
                    return null;
                }
            }
            return event;
        }

    }

    private Parent createContent() {
        TableView<Locale> table = new TableView<>(FXCollections.observableArrayList(Locale.getAvailableLocales()));
        // just to see that right/left are intercepted while up/down are handled
        table.getSelectionModel().setCellSelectionEnabled(true);

        TableColumn<Locale, String> country = new TableColumn<>("Country");
        country.setCellValueFactory(new PropertyValueFactory<>("displayCountry"));
        TableColumn<Locale, String> language = new TableColumn<>("Language");
        language.setCellValueFactory(new PropertyValueFactory<>("displayLanguage"));
        table.getColumns().addAll(country, language);
        // disables default focus traversal
        //  table.setFocusTraversable(false);

        // decide which keys to intercept
        List<KeyCode> toIntercept = List.of(KeyCode.LEFT, KeyCode.RIGHT);
        Predicate<Event> interceptor = e -> {
            if (e instanceof KeyEvent) {
                return toIntercept.contains(((KeyEvent) e).getCode());
            }
            return false;
        };
        table.setEventDispatcher(new InterceptingEventDispatcher(
                (BasicEventDispatcher) table.getEventDispatcher(), interceptor));

        TextField textField = new TextField("something to show");
        textField.setPrefColumnCount(20);
        textField.setText("something to see");

        table.prefWidthProperty().bind(textField.widthProperty());
        Popup popUp = new Popup();
        popUp.getContent().add(table);

        textField.setOnKeyTyped(event -> {
            if(!popUp.isShowing()){
                popUp.show(
                        textField.getScene().getWindow(),
                        textField.getScene().getWindow().getX()
                                + textField.localToScene(0, 0).getX()
                                + textField.getScene().getX(),
                        textField.getScene().getWindow().getY()
                                + textField.localToScene(0, 0).getY()
                                + textField.getScene().getY()
                                + textField.getHeight() - 1);
            }
        });

        BorderPane content = new BorderPane(textField);
        return content;
    }

    @Override
    public void start(Stage stage) throws Exception {
        stage.setScene(new Scene(createContent()));
        stage.show();
    }

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

}
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