通过使用另一个类 JavaFX 更改矩形的属性。

huangapple
go评论97阅读模式
英文:

Change the property of a rectangle by using another class JavaFX

问题

我正在研究一个项目，我想在按下按钮时出现一个矩形。然而，我想通过将按钮点击导向不同的类来实现这一点。以下是我尝试过的内容：

这是我的第一个类，"Main"

  1. 	static boolean btnClicked = false;
  2. 	@Override
  3. 	public void start(Stage primaryStage) {
  4. 		
  5. 		Button btn = new Button("Make Popup Visible");
  6. 		
  7. 		Rectangle menu = new Rectangle(40, 40, 200, 200);
  8. 		menu.setFill(Color.BLACK);
  9. 		menu.setOpacity(0);
  10. 		
  11. 		btn.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent e) -> {
  12. 			AddRect.showMenu();
  13. 		});
  14. 		
  15. 		if (btnClicked == true) {
  16. 			menu.setOpacity(1);
  17. 		}
  18. 		
  19. 		Group root = new Group();
  20. 		root.getChildren().addAll(btn, menu);
  21. 		Scene scene = new Scene(root, 400, 400);
  22. 		scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
  23. 		primaryStage.setScene(scene);
  24. 		primaryStage.show();
  25. 	}
  26. 	
  27. 	public static void main(String[] args) {
  28. 		launch(args);
  29. 	}

和我的第二个类，"AddRect"

  1. public class AddRect {
  2. 	static void showMenu() {
  3. 		Main.btnClicked = true;
  4. 	}
  5. }

然而，这不起作用，我不知道为什么。有人能帮助我吗？我甚至不知道这是否是最好的方法（使用两个类），但如果有更好的方法，请告诉我。先谢谢！

[注意：以上是代码的翻译，不包括问题和其他内容。]

英文:

I'm working on a project and I want a rectangle to appear when I press a button. However, I want to do this by directing the button click to a different class. Here is what I've tried:

Here is my first class, "Main"

  1. static boolean btnClicked = false;
  2. 	@Override		
  3. 	
  4. public void start(Stage primaryStage) {
  5. 	
  6. 	Button btn = new Button("Make Popup Visible");
  7. 	
  8. 	Rectangle menu = new Rectangle(40,40,200,200);
  9. 	menu.setFill(Color.BLACK);
  10. 	menu.setOpacity(0);
  11. 	
  12. 	btn.addEventHandler(MouseEvent.MOUSE_CLICKED,(MouseEvent e) ->{
  13. 		AddRect.showMenu();
  14. 	});
  15. 	
  16. 	if(btnClicked == true) {
  17. 		menu.setOpacity(1);
  18. 	}
  19. 	
  20. 	Group root = new Group();
  21. 	root.getChildren().addAll(btn, menu);
  22. 	Scene scene = new Scene(root,400,400);
  23. 	scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
  24. 	primaryStage.setScene(scene);
  25. 	primaryStage.show();
  27. }
  29. public static void main(String[] args) {
  30. 	launch(args);
  31. }

And my second class, "AddRect"

  1. public class AddRect {
  2. 	static void showMenu() {
  3. 		Main.btnClicked = true;
  4. 	}
  5. }

However, this isn't working, and I don't know why. Can somebody help me? I don't even know if this is the best way to do it (Using two classes), but if there is a better way please let me know. Thanks in advance!

答案1

得分: 0

我明白了！我只需要将条件移到 EventHandler 内部

  1. btn.addEventHandler(MouseEvent.MOUSE_CLICKED, (MouseEvent e) -> {
  2.     AddRect.showMenu();
  3.     if (btnClicked == true) {
  4.         menu.setOpacity(1);
  5.     }
  6. });
英文:

I figured it out! I just had to move the conditional inside the EventHandler

  1. 	btn.addEventHandler(MouseEvent.MOUSE_CLICKED,(MouseEvent e) ->{
  2. 		AddRect.showMenu();
  3. 		if(btnClicked == true) {
  4. 			menu.setOpacity(1);
  5. 		}
  6. 	});

huangapple
  • 本文由 发表于 2020年8月14日 05:01:09
  • 转载请务必保留本文链接：https://go.coder-hub.com/63403149.html
  • java
  • javafx
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定