如何在javafx中用鼠标绘制选定的网格窗格范围

Posted 2023-02-26

【中文标题】如何在javafx中用鼠标绘制选定的网格窗格范围

【英文标题】：How to paint the selected gridpane range with mouse in javafx

【发布时间】：2014-01-09 08:58:41

【问题描述】：

我想选择几个网格单元格并更改它们的颜色。

        myGridPane.getChildren().get(indexer).setOnDragEntered(new EventHandler<DragEvent>()
            @Override
            public void handle(DragEvent t) 
                myGridPane.getChildren().get(ci).setStyle("-fx-background-color:yellow;");   
                            
        );

【问题讨论】：

GridPane 单元格上发生拖动事件时是否要突出显示单元格？

我想点击鼠标，当释放它时，选定的单元格会给出一些颜色

你打算如何上色？ 颜色选择器会弹出吗？

【参考方案1】：

我在网格窗格中添加了 3 个标签，并为每个标签添加了一个点击处理程序。看看这是不是你想要的。

import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Control;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.RowConstraints;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class GridPaneStyle extends Application

@Override
public void start(final Stage stage)

    // create a grid with some sample data.
    GridPane grid = new GridPane();

    final Label l1 = new Label("1");
    final Label l2 = new Label("2");
    final Label l3 = new Label("3");


    l1.setOnMouseClicked(new EventHandler<MouseEvent>()
    

        @Override
        public void handle(MouseEvent arg0)
        
            l1.setStyle("-fx-background-color:yellow;");

        
    );

    l2.setOnMouseClicked(new EventHandler<MouseEvent>()
    

        @Override
        public void handle(MouseEvent arg0)
        
            l2.setStyle("-fx-background-color:yellow;");

        
    );


    l3.setOnMouseClicked(new EventHandler<MouseEvent>()
    

        @Override
        public void handle(MouseEvent arg0)
        
            l3.setStyle("-fx-background-color:yellow;");

        
    );


    grid.addRow(0, l1, l2, l3);

    for (Node n : grid.getChildren())
    
        Control control = (Control) n;
        control.setMaxSize(Double.MAX_VALUE, Double.MAX_VALUE);
        control.setStyle("-fx-background-color: tomato; -fx-alignment: center;");
    

    grid.setStyle("-fx-background-color: palegreen; -fx-padding: 2; -fx-hgap: 2; -fx-vgap: 2;");
    grid.setSnapToPixel(false);

    ColumnConstraints oneThird = new ColumnConstraints();
    oneThird.setPercentWidth(100 / 3.0);
    oneThird.setHalignment(HPos.CENTER);
    grid.getColumnConstraints().addAll(oneThird, oneThird, oneThird);
    RowConstraints oneHalf = new RowConstraints();
    oneHalf.setPercentHeight(100 / 2.0);
    oneHalf.setValignment(VPos.CENTER);
    grid.getRowConstraints().addAll(oneHalf, oneHalf);

    StackPane layout = new StackPane();
    layout.setStyle("-fx-background-color: white;");
    layout.getChildren().addAll(grid);
    stage.setScene(new Scene(layout, 600, 400));
    stage.show();



public static void main(String[] args)

    launch();