Javafx确定鼠标右键单击时相对于网格窗格的位置[英] Javafx - Determine position of cursor on right click relative to gridpane

问题描述

我有一个 40x40 的网格窗格,显示地图.目前,我有以下方法监听右键:

    //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());
            } 
        }
    });

我想要实现的是:

<块引用>

如果右键单击后选择了菜单项,我想保存变量中右键单击的位置
例如[32,12] 如果右键单击是 32 块网格窗格,向上 12 块.


关于如何去做这件事有什么建议吗?
提前致谢

// 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);

推荐答案

为网格中的每个单元格添加一个侦听器,而不是在舞台上添加一个鼠标侦听器.用于上下文菜单处理的正确侦听器是 contextMenuRequested 处理程序:

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);
    }
}

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