Question

编辑：代码可用   github上（https://github.com/goxr3plus/DragAdjustableLabel）

问题

我在javaFX制作了一个自定义控件，我不知道如何命名。它实际上并不存在于javaFX包中，但我在其他程序中看到它，例如LMMS，它用于控制音量。

问题

当鼠标到达监视器屏幕的顶部或底部时，无法执行任何操作。看看代码，看看我在说什么。如何解决问题？您可以随意将标题编辑为更合适的标题。

import java.awt.Robot;

import javafx.application.Application;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class FX3 extends Application {

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

        // Root-BorderPane
        BorderPane borderPane = new BorderPane(new VolumeLabel(0, 100));
        borderPane.setStyle("-fx-background-color:black;");

        // Scene
        stage.setScene(new Scene(borderPane, 200, 200, Color.BLACK));
        stage.show();
    }

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

    // TODO SpecialLabel
    class VolumeLabel extends Label {

        int screenX, screenY, previousY, minimumValue, maximumValue;

        IntegerProperty currentValue = new SimpleIntegerProperty(15);

        /**
         * Constructor
         */
        public VolumeLabel(int minimumValue, int maximumValue) {

            this.minimumValue = minimumValue;
            this.maximumValue = maximumValue;
            textProperty().bind(currentValue.asString().concat(" %"));
            setStyle(
                    "-fx-background-color:white; -fx-text-fill:black; -fx-padding:-2 8 -2 8;  -fx-background-radius: 15; -fx-font-size:20; -fx-cursor:open-hand;");

            // MouseListeners
            setOnMousePressed(m -> {
                screenX = (int) m.getScreenX();
                screenY = (int) m.getScreenY();
                    //setCursor(Cursor.NONE);          //Uncommend this line to make the cursor invisible
            });

            setOnMouseDragged(m -> {
                setCurrentValue(
                        getCurrentValue() + (m.getScreenY() == previousY ? 0 : m.getScreenY() > previousY ? -1 : 1));
                previousY = (int) m.getScreenY();
            });

            setOnMouseReleased(m -> {
                // When the mouse is released -> move it to the initial position
                try {
                    new Robot().mouseMove(screenX, screenY);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                setCursor(Cursor.OPEN_HAND);
            });
        }

        /**
         * Returns the Current Value of VolumeLabel
         * 
         * @return
         */
        public int getCurrentValue() {
            return currentValue.get();
        }

        /**
         * Setting the Current Value of VolumeLabel
         * 
         * @param value
         */
        public void setCurrentValue(int value) {
            //System.out.println("Value:" + value + ", CurrentValue:" + currentValue.get());
            if (value >= minimumValue && value <= maximumValue)
                currentValue.set(value);
        }

    }

}

Answer 1

以下是答案（代码也在github上）：

import java.awt.Robot;

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Cursor;
import javafx.scene.control.Label;
import javafx.stage.Screen;

/**
 * A custom Node which is working like a Slider. <br>
 * <b>!</b> When you hold the mouse on it and drag upside the value is
 * increased. <br>
 * <b>!</b> When you hold the mouse on it and drag down side the value is
 * decreased.
 * 
 * <br>
 * Usage:
 * 
 * <pre>
 * <code>
*     //initialize
*     DragAdjustableLabel dragAdjustableLabel = new DragAdjustableLabel(10, 0, 100);
*     
*     //add it for example to a BorderPane
*     primaryStage.setScene(new Scene(new BorderPane(dragAdjustableLabel)));
 *</code>
 * </pre>
 * 
 * @author GOXR3PLUS
 * @version 1.0
 */
public class DragAdjustableLabel extends Label {

    // Variables
    private int screenX;
    private int screenY;
    private int previousY;
    private int minimumValue;
    private int maximumValue;

    /**
     * The current value of the DragAdjustableLabel
     */
    private IntegerProperty currentValue;

    /**
     * Constructor
     * 
     * @param minimumValue
     *            Minimum Value that the slider can have
     * @param maximumValue
     *            Maximum Value that the slider can have
     */
    public DragAdjustableLabel(int currentValue, int minimumValue, int maximumValue) {

        this.currentValue = new SimpleIntegerProperty(currentValue);
        this.minimumValue = minimumValue;
        this.maximumValue = maximumValue;

        // Add a costume style class
        this.getStyleClass().add("drag-adjustable-label");
        setCursor(Cursor.OPEN_HAND);

        textProperty().bind(this.currentValue.asString().concat(" %"));

        // when the mouse is pressed
        setOnMousePressed(m -> {
            screenX = (int) m.getScreenX();
            screenY = (int) m.getScreenY();
            setCursor(Cursor.NONE); // comment this line to make the cursor
                                    // visible
        });

        // when the mouse is dragged
        setOnMouseDragged(m -> {

            // calculate the monitor height
            double screenHeight = Screen.getPrimary().getBounds().getHeight();

            // !if the mouse has reached the the top of the monitor
            // or
            // ! if the mouse has reached the bottom of the monitor
            if (m.getScreenY() <= 0 || m.getScreenY() + 10 >= screenHeight) {
                resetMouse();
                return;
            }

            // Calculate the current value
            setCurrentValue(
                    getCurrentValue() + (m.getScreenY() == previousY ? 0 : m.getScreenY() > previousY ? -1 : 1));
            previousY = (int) m.getScreenY();
        });

        // when the mouse is released
        setOnMouseReleased(m -> {
            resetMouse();
            setCursor(Cursor.OPEN_HAND);
        });
    }

    /**
     * Reset the mouse to the default position(which is the center of the
     * element)
     * 
     * @param x
     * @param y
     */
    private void resetMouse() {
        try {
            new Robot().mouseMove(screenX, screenY);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    /**
     * Set the current value
     * 
     * @param value
     */
    public void setCurrentValue(int value) {

        // if the value is between the limits
        if (value >= minimumValue && value <= maximumValue)
            currentValue.set(value);
    }

    public int getCurrentValue() {
        return currentValue.get();
    }

    public IntegerProperty currentValueProperty() {
        return currentValue;
    }

}

JavaFX拖动可调标签像Slider

1 个答案: