获取网格中的点击位置。 Java 摇摆

Question

我得到了这个代码，它创建了一个显示鼠标位置的可点击网格，尽管我无法在网格中获得鼠标点击的位置，试图同时成为 X 和 Y 位置。有任何想法吗？这是网格的外观：

代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.Border;
import javax.swing.border.MatteBorder;

public class TestGrid02 {


    public TestGrid02() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {
        private static final int ROWS = 20;
        private static final int COLUMNS = 20;
        private static GridBagConstraints gbc;

        public TestPane() {
            setLayout(new GridBagLayout());

            gbc = new GridBagConstraints();
            for (int row = 0; row < ROWS; row++) {
                for (int col = 0; col < COLUMNS; col++) {
                    gbc.gridx = col;
                    gbc.gridy = row;
                    CellPane cellPane = new CellPane();
                    Border border = null;
                    if (row < ROWS-1) {
                        if (col < COLUMNS-1) {
                            border = new MatteBorder(1, 1, 0, 0, Color.GRAY);
                        } else {
                            border = new MatteBorder(1, 1, 0, 1, Color.GRAY);
                        }
                    } else {
                        border = new MatteBorder(1, 1, 1, 0, Color.GRAY);
                    }
                    cellPane.setBorder(border);
                    add(cellPane, gbc);
                }
            }
        }
    }

    public class CellPane extends JPanel {

        private Color defaultBackground;

        public CellPane() {
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseEntered(MouseEvent e) {
                    defaultBackground = getBackground();
                    setBackground(Color.RED);
                }

                @Override
                public void mouseExited(MouseEvent e) {
                    setBackground(defaultBackground);
                }
                @Override
                public void mouseClicked(MouseEvent e){
                    //Here is where it is supposed to be
                }
            });
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(30, 30);
        }
    }
}

在 CellPane 类中，witch 旨在成为侦听鼠标的那个，它应该是我需要的函数，在 mouseClicked 侦听器中，但是我尝试使用 e.getX() 或 e.getLocationOnScreen () 并且每次我在同一个网格中单击时，这些值都会发生变化。

Answer 1

嗯，看起来familiar?

因此，基本思想是通过构造函数将其坐标（即行/列）值传递给单元格，例如...

public class CellPane extends JPanel {

    private Color defaultBackground;
    
    private Point cellCoordinate;

    public CellPane(Point cellCoordinate) {
        this.cellCoordinate = cellCoordinate;
        addMouseListener(new MouseAdapter() {
            @Override
            public void mouseEntered(MouseEvent e) {
                defaultBackground = getBackground();
                setBackground(Color.RED);
            }

            @Override
            public void mouseExited(MouseEvent e) {
                setBackground(defaultBackground);
            }

            @Override
            public void mouseClicked(MouseEvent e) {
                //Here is where it is supposed to be
                System.out.println("Did click cell @ " + getCellCoordinate().x + "x" + getCellCoordinate().y);
            }
        });
    }

    public Point getCellCoordinate() {
        return cellCoordinate;
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(30, 30);
    }
}

单元格本身并不关心，它没有任何合理的信息可用于确定其布局方式，因此最好的办法是“告诉”它您希望它表示的信息。

对我来说，我只需传入GridBagLayout 行/列信息，例如...

gbc.gridx = col;
gbc.gridy = row;
CellPane cellPane = new CellPane(new Point(col, row));

这样你就消除了单元格布局的所有概念（以及与之相关的问题）

Answer 2

这种方法（使用按钮和动作侦听器）更好的 IMO。它使用getButtonRowCol 方法返回一个字符串，指示按钮在数组中的位置（buttonArray）。

使用b.setBorderPainted(false);（取消注释该代码行）去除每个按钮周围的边框。查看传递给GridLayout 的构造函数的值以删除按钮之间的空间。

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;

public class GameGridLayout {

    int size = 40;
    int iconSize = 10;
    JButton[][] buttonArray = new JButton[size][size];
    ActionListener actionListener;
    JLabel output = new JLabel("Click somewhere on the GUI");

    GameGridLayout() {
        JPanel gui = new JPanel(new BorderLayout(2,2));
        gui.setBorder(new EmptyBorder(4,4,4,4));
        gui.add(output,BorderLayout.PAGE_END);
        JPanel gameContainer = new JPanel(new GridLayout(0,size,2,2));
        gui.add(gameContainer);
        actionListener = e -> output.setText(getButtonRowCol((JButton)e.getSource()));
        for (int ii=0; ii<size*size; ii++) {
            JButton b = getButton();
            gameContainer.add(b);
            buttonArray[ii%size][ii/size] = b;
        }
        JFrame f = new JFrame("GameGridLayout");
        f.add(gui);
        f.pack();
        f.setMinimumSize(f.getSize());
        f.setLocationByPlatform(true);
        f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
        f.setVisible(true);
    }

    private String getButtonRowCol(JButton button) {
        StringBuilder sb = new StringBuilder();
        for (int xx=0; xx<size; xx++) {
            for (int yy=0; yy<size; yy++) {
                if (button.equals(buttonArray[xx][yy])) {
                    sb.append("User selected button at: ");
                    sb.append(xx+1);
                    sb.append(",");
                    sb.append(yy+1);
                    break;
                }
            }
        }
        return sb.toString();
    }

    private JButton getButton() {
        JButton b = new JButton();
        b.setIcon(new ImageIcon(
                new BufferedImage(iconSize,iconSize,BufferedImage.TYPE_INT_ARGB)));
        b.setRolloverIcon(new ImageIcon(
                new BufferedImage(iconSize,iconSize,BufferedImage.TYPE_INT_RGB)));
        b.setMargin(new Insets(0,0,0,0));
        //b.setBorderPainted(false);
        b.setContentAreaFilled(false);
        b.addActionListener(actionListener);
        return b;
    }

    public static void main(String[] args) {
        Runnable r = () -> new GameGridLayout();
        SwingUtilities.invokeLater(r);
    }
}