獲取節點相對於的邊界到另一節點/窗格JavaFX的

Question

我有一個TextArea這在ScrollPane其中ScrollPane可以通過在TextArea調用getParent()五次找到。有沒有辦法找到TextArea相對於ScrollPane的座標？

Answer 1

你可以這樣做：

Bounds bounds = 
    scrollPane.sceneToLocal(textArea.localToScene(textArea.getBoundsInLocal())); 

這裏有一個完整的例子：

import javafx.application.Application; 
import javafx.beans.value.ChangeListener; 
import javafx.geometry.Bounds; 
import javafx.geometry.Insets; 
import javafx.geometry.Pos; 
import javafx.scene.Scene; 
import javafx.scene.control.ScrollPane; 
import javafx.scene.control.TextArea; 
import javafx.scene.control.TextField; 
import javafx.scene.layout.BorderPane; 
import javafx.scene.layout.VBox; 
import javafx.scene.paint.Color; 
import javafx.scene.shape.Rectangle; 
import javafx.stage.Stage; 

public class TextAreaBoundsInScrollPane extends Application { 

    @Override 
    public void start(Stage primaryStage) { 
     ScrollPane scrollPane = new ScrollPane(); 

     VBox scrollPaneContent = new VBox(5); 
     TextArea textArea = new TextArea(); 
     scrollPaneContent.setPadding(new Insets(10)); 
     scrollPaneContent.setAlignment(Pos.CENTER); 

     scrollPaneContent.getChildren().add(new Rectangle(200, 80, Color.CORAL)); 
     scrollPaneContent.getChildren().add(textArea); 
     scrollPaneContent.getChildren().add(new Rectangle(200, 120, Color.CORNFLOWERBLUE)); 

     scrollPane.setContent(scrollPaneContent); 

     BorderPane root = new BorderPane(scrollPane); 
     root.setTop(new TextField()); 
     root.setBottom(new TextField()); 

     ChangeListener<Object> boundsChangeListener = (obs, oldValue, newValue) -> { 
      Bounds bounds = scrollPane.sceneToLocal(textArea.localToScene(textArea.getBoundsInLocal())); 
      System.out.printf("[%.1f, %.1f], %.1f x %.1f %n", bounds.getMinX(), bounds.getMinY(), bounds.getWidth(), bounds.getHeight()); 
     }; 

     textArea.boundsInLocalProperty().addListener(boundsChangeListener); 
     textArea.localToSceneTransformProperty().addListener(boundsChangeListener); 
     scrollPane.localToSceneTransformProperty().addListener(boundsChangeListener); 

     Scene scene = new Scene(root, 400, 400); 
     primaryStage.setScene(scene); 
     primaryStage.show(); 
    } 

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