我正在开发一个挑战,每次用户按下按钮时,我都必须在屏幕上添加一个新圆圈。除了允许用户选择要添加的圆圈的大小和颜色之外。我成功开发了这个功能!
下一步是选择一个圆圈,将其从其他圆圈中突出显示,并允许您使用箭头键在界面中移动它。我设法开发的第一部分是,每次用户用鼠标选择一个圆圈时,它上面就会出现一个边框,突出显示它。但是,我无法开发移动功能。每当我单击箭头键时,圆圈不会移动,而是按钮之间的焦点发生变化。
你能帮我一下吗?
这是我的 FXMLDocumentController.java:
package addcircleapp;
import java.net.URL;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.ColorPicker;
import javafx.scene.control.Slider;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.KeyCode;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.ResourceBundle;
public class FXMLDocumentController implements Initializable {
@FXML
private Pane containerPane;
@FXML
private Button addCircleButton;
@FXML
private ColorPicker colorPicker;
@FXML
private Slider sizeSlider;
private List<Circle> circles = new ArrayList<>();
private Circle selectedCircle = null;
@FXML
private void handleAddCircleButton(ActionEvent event) {
Random rand = new Random();
int x = rand.nextInt(500);
int y = rand.nextInt(200);
Color selectedColor = colorPicker.getValue();
double selectedSize = sizeSlider.getValue();
Circle circle = new Circle(x, y, selectedSize, selectedColor);
circle.setOnMouseClicked((MouseEvent e) -> {
handleCircleClick(circle);
});
circle.setOnKeyPressed((KeyEvent e) -> {
handleCircleMovement(e, circle);
});
circles.add(circle);
containerPane.getChildren().add(circle);
System.out.println("New circle was created!");
}
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
private void handleCircleClick(Circle clickedCircle) {
/*circles.forEach((circle) -> {
circle.setStroke(Color.TRANSPARENT);
});*/
if(selectedCircle != null){
selectedCircle.setStroke(Color.TRANSPARENT);
}
selectedCircle = clickedCircle;
selectedCircle.setStroke(Color.BLACK);
selectedCircle.setStrokeWidth(2.0);
}
private void handleCircleMovement(KeyEvent event, Circle circle){
if(event.getCode() == KeyCode.LEFT){
circle.setCenterX(circle.getCenterX() - 10);
} else if(event.getCode() == KeyCode.RIGHT){
circle.setCenterX(circle.getCenterX() + 10);
} else if(event.getCode() == KeyCode.UP){
circle.setCenterY(circle.getCenterY() - 10);
} else if(event.getCode() == KeyCode.DOWN){
circle.setCenterY(circle.getCenterY() + 10);
}
}
}
这是我的 FXMLDocument.fxml:
<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ColorPicker?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.layout.Pane?>
<Pane fx:id="containerPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/8.0.171" xmlns:fx="http://javafx.com/fxml/1" fx:controller="addcircleapp.FXMLDocumentController">
<children>
<Button fx:id="addCircleButton" layoutX="345.0" layoutY="362.0" mnemonicParsing="false" onAction="#handleAddCircleButton" text="AddCircle" />
<ColorPicker fx:id="colorPicker" layoutX="14.0" layoutY="361.0" />
<Slider fx:id="sizeSlider" blockIncrement="1.0" layoutX="180.0" layoutY="367.0" min="1.0" value="50.0" />
</children>
</Pane>
这是我的 AddCircleApp.java:
package addcircleapp;
import java.util.ArrayList;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class AddCircleApp extends Application {
@Override
public void start(Stage stage) throws Exception {
Parent root = FXMLLoader.load(getClass().getResource("FXMLDocument.fxml"));
Scene scene = new Scene(root);
stage.setScene(scene);
stage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
}
我想在界面周围移动选定的圆圈,而不是更改界面中存在的输入之间的焦点。我已经尝试使用 ChatGPT 找到解决方案,但没有成功。
键盘事件仅传递到具有键盘焦点的节点。所以当圆圈被选中时,需要请求圆圈具有焦点:
private void handleCircleClick(Circle clickedCircle) {
/*circles.forEach((circle) -> {
circle.setStroke(Color.TRANSPARENT);
});*/
if(selectedCircle != null){
selectedCircle.setStroke(Color.TRANSPARENT);
}
selectedCircle = clickedCircle;
selectedCircle.setStroke(Color.BLACK);
selectedCircle.setStrokeWidth(2.0);
selectedCircle.requestFocus();
}
此外,场景中的默认键盘处理程序会将焦点移动到某些按键的其他节点。因此,您可能希望使用正在处理的按键的事件,以防止键盘焦点移动:
private void handleCircleMovement(KeyEvent event, Circle circle){
if(event.getCode() == KeyCode.LEFT){
circle.setCenterX(circle.getCenterX() - 10);
event.consume();
} else if(event.getCode() == KeyCode.RIGHT){
circle.setCenterX(circle.getCenterX() + 10);
event.consume();
} else if(event.getCode() == KeyCode.UP){
circle.setCenterY(circle.getCenterY() - 10);
event.consume();
} else if(event.getCode() == KeyCode.DOWN){
circle.setCenterY(circle.getCenterY() + 10);
event.consume();
}
}