JavaFX在折線圖上添加上下文菜單

Question

我想在右鍵單擊折線圖時添加上下文菜單。 它基本上是重新調整chart.Is有什麼辦法可以實現這一目標嗎？

Answer 1

這是一個代碼片段，當折線圖右鍵單擊時，可以在折線圖上顯示調整大小的上下文菜單。

final MenuItem resizeItem = new MenuItem("Resize"); 
resizeItem.setOnAction(new EventHandler<ActionEvent>() { 
    @Override public void handle(ActionEvent event) { 
    System.out.println("Resize requested"); 
    } 
}); 

final ContextMenu menu = new ContextMenu(
    resizeItem 
); 

lineChart.setOnMouseClicked(new EventHandler<MouseEvent>() { 
    @Override public void handle(MouseEvent event) { 
    if (MouseButton.SECONDARY.equals(event.getButton())) { 
     menu.show(stage, event.getScreenX(), event.getScreenY()); 
    } 
    } 
}); 

---

一些完整的示例代碼：

import javafx.application.Application; 
import javafx.event.*; 
import javafx.scene.Scene; 
import javafx.scene.chart.*; 
import javafx.scene.control.*; 
import javafx.scene.input.*; 
import javafx.stage.Stage; 

public class LineChartWithContextMenu extends Application { 
    @Override public void start(final Stage stage) { 
     stage.setTitle("Line Chart Sample"); 

     //defining the axes 
     final NumberAxis xAxis = new NumberAxis(); 
     xAxis.setLabel("Number of Month"); 
     final NumberAxis yAxis = new NumberAxis(); 

     //creating the chart 
     final LineChart<Number,Number> lineChart = 
       new LineChart<>(xAxis,yAxis); 

     lineChart.setTitle("Stock Monitoring, 2010"); 

     //defining a series 
     XYChart.Series series = new XYChart.Series(); 
     series.setName("My portfolio"); 

     //populating the series with data 
     series.getData().setAll(
      new XYChart.Data(1, 23), 
      new XYChart.Data(2, 14), 
      new XYChart.Data(3, 15), 
      new XYChart.Data(4, 24), 
      new XYChart.Data(5, 34), 
      new XYChart.Data(6, 36), 
      new XYChart.Data(7, 22), 
      new XYChart.Data(8, 45), 
      new XYChart.Data(9, 43), 
      new XYChart.Data(10, 17), 
      new XYChart.Data(11, 29), 
      new XYChart.Data(12, 25) 
     ); 

     lineChart.getData().add(series); 

     //adding a context menu item to the chart 
     final MenuItem resizeItem = new MenuItem("Resize"); 
     resizeItem.setOnAction(new EventHandler<ActionEvent>() { 
      @Override public void handle(ActionEvent event) { 
      System.out.println("Resize requested"); 
      } 
     }); 

     final ContextMenu menu = new ContextMenu(
      resizeItem 
     ); 

     lineChart.setOnMouseClicked(new EventHandler<MouseEvent>() { 
      @Override public void handle(MouseEvent event) { 
      if (MouseButton.SECONDARY.equals(event.getButton())) { 
       menu.show(stage, event.getScreenX(), event.getScreenY()); 
      } 
      } 
     }); 

     stage.setScene(
      new Scene(
      lineChart,800,600 
     ) 
     ); 
     stage.show(); 
    } 

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