更新1

我已整合José Pereda's code。隐藏按钮（.hide）已成功隐藏。现在我很难继续一直显示键盘。

问题：

每当键盘隐藏textarea焦点时。因此，当用户点击Convert Now!按钮时，键盘会隐藏。我尝试使用textarea专注于textarea.requestFocus();，但键盘闪烁（隐藏然后显示）。

我的目标

除非程序没有终止，否则永远不要隐藏键盘。

代码：您也可以在github上查看我的代码。

package com.binaryname.view;

import java.util.Iterator;

import com.sun.javafx.print.PrintHelper;
import com.sun.javafx.print.Units;
import com.sun.javafx.scene.control.skin.FXVK;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Pos;
import javafx.geometry.Rectangle2D;
import javafx.print.PageLayout;
import javafx.print.PageOrientation;
import javafx.print.Paper;
import javafx.print.Printer;
import javafx.print.PrinterJob;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.TextArea;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Path;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.scene.transform.Scale;
import javafx.stage.PopupWindow;
import javafx.stage.Screen;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.stage.Window;

public class Main extends Application {

    private PopupWindow keyboard;

    private final Rectangle2D visualBounds = Screen.getPrimary().getVisualBounds();
    private final Rectangle2D bounds = Screen.getPrimary().getBounds();
    private final double taskbarHeight = bounds.getHeight() - visualBounds.getHeight();

    @Override
    public void start(Stage primaryStage) throws Exception {

        primaryStage.setTitle("Binary Name");

        Label helloLbl = new Label("Hello");
        helloLbl.setAlignment(Pos.CENTER);
        helloLbl.setFont(Font.font("Comic Sans MS", FontWeight.BOLD, 68));
        helloLbl.setStyle("-fx-background-color: red;padding: 20px;");
        helloLbl.setTextFill(Color.web("#ffffff"));

        Label myNameLbl = new Label("my name is");
        myNameLbl.setAlignment(Pos.CENTER);
        myNameLbl.setFont(Font.font("Comic Sans MS", 48));
        myNameLbl.setStyle("-fx-background-color: red;padding: 20px;");
        myNameLbl.setTextFill(Color.web("#ffffff"));

        TextArea nameTxtArea = new TextArea();
        nameTxtArea.setWrapText(Boolean.TRUE);
        nameTxtArea.getStyleClass().add("center-text-area");
        nameTxtArea.setFont(Font.font("Comic Sans MS", 28));
        nameTxtArea.setStyle("padding: 20px;");

        Button printBtn = new Button("PRINT");
        printBtn.setId("ipad-grey");
        printBtn.setDisable(Boolean.TRUE);

        Button convertBtn = new Button("Convert Now!");
        convertBtn.setId("ipad-grey");
        convertBtn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                nameTxtArea.requestFocus();
                convertBtn.setDisable(Boolean.TRUE);
                printBtn.setDisable(Boolean.FALSE);
            }
        });

        HBox hBox = new HBox(100);
        hBox.setAlignment(Pos.CENTER);
        hBox.getChildren().addAll(convertBtn, printBtn);

        VBox vBox = new VBox(10);
        vBox.setAlignment(Pos.TOP_CENTER);
        vBox.getChildren().addAll(helloLbl, myNameLbl, nameTxtArea, hBox);
        vBox.setStyle("-fx-background-color: red;margin: 20px;");

        printBtn.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                nameTxtArea.requestFocus();
                // Start printing
                print(vBox, nameTxtArea.getText());
                convertBtn.setDisable(Boolean.FALSE);
                printBtn.setDisable(Boolean.TRUE);
                nameTxtArea.setText("");
            }
        });

        Scene scene = new Scene(vBox);
        scene.getStylesheets().add(Main.class.getResource("/style.css").toExternalForm());

        primaryStage.setScene(scene);
        primaryStage.initStyle(StageStyle.UNDECORATED);
        primaryStage.setScene(scene);
        primaryStage.setX(visualBounds.getMinX());
        primaryStage.setY(visualBounds.getMinY());
        primaryStage.setWidth(visualBounds.getWidth());
        primaryStage.setHeight(visualBounds.getHeight());

        adjustTextAreaLayout(nameTxtArea);

        primaryStage.show();

        // attach keyboard to first node on scene:
        Node first = scene.getRoot().getChildrenUnmodifiable().get(0);
        if (first != null) {
            FXVK.init(first);
            FXVK.attach(first);
            keyboard = getPopupWindow();
        }

        nameTxtArea.focusedProperty().addListener((ob, b, b1) -> {
            if (keyboard == null) {
                keyboard = getPopupWindow();
            }

            keyboard.setHideOnEscape(Boolean.FALSE);
            keyboard.setAutoHide(Boolean.FALSE);
            keyboard.centerOnScreen();
            keyboard.requestFocus();

            keyboard.yProperty().addListener(obs -> {

                Platform.runLater(() -> {
                    Double y = bounds.getHeight() - taskbarHeight - keyboard.getY();
                    nameTxtArea.setMaxHeight((bounds.getHeight() - y) * 0.4);
                    nameTxtArea.setMinHeight((bounds.getHeight() - y) * 0.4);
                });
            });

        });     

    }

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

    private void print(Node node1, String text) {
        // Create a printer job for the default printer

        Printer printer = Printer.getDefaultPrinter();
        Paper label = PrintHelper.createPaper("2.5x3.5", 2.5, 3.5, Units.INCH);
        PageLayout pageLayout = printer.createPageLayout(label, PageOrientation.LANDSCAPE, Printer.MarginType.EQUAL);

        PrinterJob job = PrinterJob.createPrinterJob();

        Node node = createFullNode(text);

        double scaleX = pageLayout.getPrintableWidth() / node1.getBoundsInParent().getWidth();
        double scaleY = pageLayout.getPrintableHeight() / node1.getBoundsInParent().getHeight();
        node.getTransforms().add(new Scale(scaleX, scaleY));

        if (job != null) {
            // Print the node
            boolean printed = job.printPage(node);

            if (printed) {
                // End the printer job
                job.endJob();
            } else {
                // Write Error Message
                System.out.println("Printing failed.");
            }
        } else {
            // Write Error Message
            System.out.println("Could not create a printer job.");
        }

        node.getTransforms().remove(node.getTransforms().size() - 1);
    }

    private PopupWindow getPopupWindow() {

        @SuppressWarnings("deprecation") 
        final Iterator<Window> windows = Window.impl_getWindows();

        while (windows.hasNext()) {
            final Window window = windows.next();
            if (window instanceof PopupWindow) {
                if (window.getScene() != null && window.getScene().getRoot() != null) { 
                    Parent root = window.getScene().getRoot();
                    if (root.getChildrenUnmodifiable().size() > 0) {
                        Node popup = root.getChildrenUnmodifiable().get(0);
                        if (popup.lookup(".fxvk") != null) {
                            FXVK vk = (FXVK) popup.lookup(".fxvk");
                            // hide the key:
                            vk.lookup(".hide").setVisible(false);
                            return (PopupWindow) window;
                        }
                    }
                }
                return null;
            }
        }
        return null;
    }

    private Node createFullNode(String text) {

        Label helloLbl = new Label("Hello");
        helloLbl.setAlignment(Pos.CENTER);
        helloLbl.setFont(Font.font("Comic Sans MS", FontWeight.BOLD, 68));
        helloLbl.setStyle("-fx-background-color: red;padding: 20px;");
        helloLbl.setTextFill(Color.web("#ffffff"));

        Label myNameLbl = new Label("my name is");
        myNameLbl.setAlignment(Pos.CENTER);
        myNameLbl.setFont(Font.font("Comic Sans MS", 48));
        myNameLbl.setStyle("-fx-background-color: red;padding: 20px;");
        myNameLbl.setTextFill(Color.web("#ffffff"));

        TextArea nameTxtArea = new TextArea();
        nameTxtArea.setWrapText(Boolean.TRUE);
        nameTxtArea.setFont(Font.font("Comic Sans MS", 28));
        nameTxtArea.setStyle("padding: 20px;");
        nameTxtArea.setText(text);
        nameTxtArea.getStyleClass().add("center-text-area");

        HBox hBox = new HBox(1000);
        hBox.setAlignment(Pos.CENTER);

        VBox vBox = new VBox(10);
        vBox.setAlignment(Pos.CENTER);
        vBox.getChildren().addAll(helloLbl, myNameLbl, nameTxtArea, hBox);
        vBox.setStyle("-fx-background-color: red;margin: 20px;");

        vBox.getStylesheets().add(Main.class.getResource("/style.css").toExternalForm());

        return vBox;
    }

    private void adjustTextAreaLayout(TextArea textArea) {
        textArea.applyCss();
        textArea.layout();

        ScrollPane textAreaScroller = (ScrollPane) textArea.lookup(".scroll-pane");
        Text text = (Text) textArea.lookup(".text");


        ChangeListener<? super Bounds> listener = 
                (obs, oldBounds, newBounds) -> centerTextIfNecessary(textAreaScroller, text);
        textAreaScroller.viewportBoundsProperty().addListener(listener);
        text.boundsInLocalProperty().addListener(listener);

    }

    private void centerTextIfNecessary(ScrollPane textAreaScroller, Text text) {
        double textHeight = text.getBoundsInLocal().getHeight();
        double viewportHeight = textAreaScroller.getViewportBounds().getHeight();
        double offset = Math.max(0, (viewportHeight - textHeight) / 2 );
        text.setTranslateY(offset);
        Parent content = (Parent)textAreaScroller.getContent();
        for (Node n : content.getChildrenUnmodifiable()) {
            if (n instanceof Path) { // caret
                n.setTranslateY(offset);
            }
        }
    }
}

Answer 1

您可以根据需要显示和隐藏虚拟键盘。

您只需要提供键盘将连接到的节点，它不需要是TextField。

显然，您显示虚拟键盘是否能够输入您的输入控件（TextField，TextArea，...），但我会将此部分留给您。

在不知道您的场景层次结构的情况下，我只选择其上的第一个节点：

.button{    
-fx-background-insets: 0 0 0 0, 0, 1, 2;
}

这将在显示舞台后立即显示键盘。

如果您想在任何时候以编程方式关闭它，您只需致电：

@Override
public void start(Stage stage) {
    ...
    stage.setScene(scene);
    stage.show();

    // attach keyboard to first node on scene:
    Node first = scene.getRoot().getChildrenUnmodifiable().get(0);
    if (first != null) {
        FXVK.init(first);
        FXVK.attach(first);
    }
}

关于隐藏键盘的其中一个键，这有点棘手，因为键盘放在一个弹出窗口中，所以首先你需要掌握它。但是你可以找到已经解决的问题，比如this一个。

以下代码段将查找弹出窗口。对于已弃用的方法，在JavaFX 9上，它将是一个公共方法（FXVK.detach();）。

javafx.stage.Windows.getWindows()

拥有虚拟键盘实例后，您将能够根据其样式类找到任何具有查找的节点。幸运的是，所有键都分配了styleClass private PopupWindow getPopupWindow() { @SuppressWarnings("deprecation") final Iterator<Window> windows = Window.impl_getWindows(); while (windows.hasNext()) { final Window window = windows.next(); if (window instanceof PopupWindow) { if (window.getScene() != null && window.getScene().getRoot() != null) { Parent root = window.getScene().getRoot(); if (root.getChildrenUnmodifiable().size() > 0) { Node popup = root.getChildrenUnmodifiable().get(0); if (popup.lookup(".fxvk") != null) { FXVK vk = (FXVK) popup.lookup(".fxvk"); return (PopupWindow) window; } } } return null; } } return null; }，因此您可以轻松地与所有键进行交互。至于隐藏键盘的特定键，这个键还有key和special样式类：

hide

完整的示例代码：

// hide the key:
vk.lookup(".hide").setVisible(false);

Javafx显示虚拟键盘

更新1

1 个答案: