Java FX中的鼠标滚动 [英] Mouse scrolling in Java FX

问题描述

我想使用mouse scroll来使圆变大(mouse-scroll-up)而使圆变小(mouse-scroll-down).

I want to use mouse scroll to make circle bigger (mouse-scroll-up) and circle smaller (mouse-scroll-down).

我已经有了使用鼠标中键更改圆半径的现有代码，但是我的问题是:

I have existing code to change circle radius smaller already with mouse middle button, but my question would be:

如何使用鼠标向上滚动和鼠标向下滚动执行相同的操作?

How can I use mouse-scroll-up and mouse-scroll-down to do the same thing?

我已经用Google搜索过，可以用ScrollEvent某种方式完成，但是我对此不太了解.

I have googled, it could be done somehow with ScrollEvent, but I can't understand this very well.

推荐答案

回答您的问题

如何使用鼠标向上滚动和鼠标向下滚动执行相同的操作?

How can I use mouse-scroll-up and mouse-scroll-down to do the same thing?

• 在圆圈上使用ScrollListener并使用
  • Use a ScrollListener on the circle and use the ScrollEvent reference to get the DeltaY.
  • Create a zoomfactor to calculate the zoom factor you want to have.
  • Apply this factor to the Scale property of your node.

  完整示例

  import javafx.application.Application;
  import javafx.scene.Group;
  import javafx.scene.Node;
  import javafx.scene.Scene;
  import javafx.scene.input.ScrollEvent;
  import javafx.scene.paint.Color;
  import javafx.scene.shape.Circle;
  import javafx.stage.Stage;
  
  public class ZoomInOutCircles extends Application {
  
      @Override
      public void start(Stage primaryStage) {
          Group root = new Group();
          Scene scene = new Scene(root, 350, 300);
          primaryStage.setTitle("Dots");
          primaryStage.setScene(scene);
  
          Circle circle = new Circle(175, 150, 10, Color.BLUE);
          addMouseScrolling(circle);
          root.getChildren().add(circle);
  
          primaryStage.show();
      }
  
      public void addMouseScrolling(Node node) {
          node.setOnScroll((ScrollEvent event) -> {
              // Adjust the zoom factor as per your requirement
              double zoomFactor = 1.05;
              double deltaY = event.getDeltaY();
              if (deltaY < 0){
                  zoomFactor = 2.0 - zoomFactor;
              }
              node.setScaleX(node.getScaleX() * zoomFactor);
              node.setScaleY(node.getScaleY() * zoomFactor);
          });
      }
  }
  

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