Javafx - 確定光標相對於柵格的右擊位置

Question

我有一個40x40的窗格，顯示一張地圖。目前，我有以下幾種方法監聽右鍵點擊：

//detect right click + display menu, select if you want to place item 1 or item 2 
    final ContextMenu cm = new ContextMenu(); 
    cm.addEventFilter(MouseEvent.MOUSE_RELEASED, new EventHandler<MouseEvent>() 
    { 
     @Override 
     public void handle(MouseEvent event) 
     { 
      if (event.getButton() == MouseButton.SECONDARY) 
       event.consume(); 

     } 
    }); 
    cm.setOnAction(new EventHandler<ActionEvent>() { 
     @Override 
     public void handle(ActionEvent event) { 
      System.out.println("Following item selected: "+ 
        ((MenuItem)event.getTarget()).getText()); 
     } 
    }); 
    //two placeable items 
    MenuItem item1Place = new MenuItem("Item 1"); 
    MenuItem item2Place = new MenuItem("Item 2"); 
    cm.getItems().addAll(item1Place, item2Place); 

    primaryStage.addEventHandler(MouseEvent.MOUSE_CLICKED, new EventHandler<MouseEvent>() 
    { 
     @Override 
     public void handle(MouseEvent e) 
     { 
      if (e.getButton() == MouseButton.SECONDARY) 
      { 
       cm.show(primaryStage, e.getScreenX(), e.getScreenY()); 
      } 
     } 
    }); 

我想實現如下：

如果菜單項爲右擊後選擇的，我d要保存 右鍵點擊位置的變量
例如[32,12]如果 右鍵單擊的是32塊網格柵格，然後是12塊。

有關如何去做這件事的任何建議？
預先感謝

// first edit code entered below. I realise the indentation is very off however fixing it seemed to turn it back to plain text 
placeItem1.setOnAction(evt -> System.out.println("Item 1 placed ["+col+", "+row+"]")); 
       placeItem2.setOnAction(evt -> System.out.println(Item 2 placed["+col+", "+row+"]")); 
       menu.show(cell, e.getScreenX(), e.getScreenY()); 
      }); 
      root.add(cell, x, y); 

Answer 1

添加監聽到的每個小區中的網格，而不是增加一個鼠標偵聽到舞臺。使用上下文菜單處理正確監聽器是一個contextMenuRequested處理程序：

import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.control.ContextMenu; 
import javafx.scene.control.MenuItem; 
import javafx.scene.input.MouseButton; 
import javafx.scene.layout.GridPane; 
import javafx.scene.layout.Pane; 
import javafx.stage.Stage; 

public class ClicksInGridPane extends Application { 

    @Override 
    public void start(Stage primaryStage) { 
     GridPane root = new GridPane(); 

     final int NUM_ROWS = 40 ; 
     final int NUM_COLS = 40 ; 

     ContextMenu menu = new ContextMenu(); 
     MenuItem menuItem1 = new MenuItem("Item 1"); 
     MenuItem menuItem2 = new MenuItem("Item 2"); 
     menu.getItems().addAll(menuItem1, menuItem2); 

     for (int x = 0 ; x < NUM_COLS ; x++) { 
      for (int y = 0 ; y < NUM_ROWS ; y++) { 
       Pane cell = new Pane(); 
       cell.setPrefSize(20, 20); 
       // add style just to draw grid: 
       cell.setStyle("-fx-background-color: black, white; -fx-background-insets: 0, 0 0 1 1;"); 

       // context menu listener: 
       final int col = x ; 
       final int row = y ; 

       cell.setOnContextMenuRequested(e -> { 
        menuItem1.setOnAction(evt -> System.out.println("Item 1 selected in cell ["+col+", "+row+"]")); 
        menuItem2.setOnAction(evt -> System.out.println("Item 2 selected in cell ["+col+", "+row+"]")); 
        menu.show(cell, e.getScreenX(), e.getScreenY()); 
       }); 

       root.add(cell, x, y); 
      } 
     } 

     primaryStage.setScene(new Scene(root)); 
     primaryStage.show(); 
    } 

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