我在GridLayout中获取按钮的X和Y索引的方法 [英] My way to get X and Y index of buttons inside GridLayout

问题描述

这与如何获取有关GridLayout内部元素的X和Y索引？帖子及其答案。

无论出于何种原因，他们都没有建议扩展 JButton 包括它在网格和相关数组按钮中的位置。

For whatever reason none of them suggested to extend JButton to include its position in the grid and in associated array of buttons.

我做了下面的插图，它只是在点击时显示按钮的坐标。

I have made the following illustration that simply displays button's coordinates when it's clicked.

扩展 JButton ：

package buttons_array;

import javax.swing.*;

@SuppressWarnings("serial")
public class ButtonWithCoordinates extends JButton {

    int coordX;
    int coordY;

    public ButtonWithCoordinates(String buttonText, int coordX, int coordY) {
        super(buttonText);
        this.coordX = coordX;
        this.coordY = coordY;
    }

    /**
     * @return the coordX
     */
    public int getCoordX() {
        return coordX;
    }

    /**
     * @return the coordY
     */
    public int getCoordY() {
        return coordY;
    }
}

示例GUI：

package buttons_array;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ButtonsArray implements ActionListener {

    private ButtonWithCoordinates buttons[][];
    private int nRows;
    private int nCols;

    private JFrame frame;
    private JPanel panel;

    public ButtonsArray(int x, int y) {
        if (x > 0 && y > 0) {
            nRows = x;
            nCols = y;
            buttons = new ButtonWithCoordinates[nRows][nCols];
            for (int i=0; i < nRows; ++i) {
                for (int j=0; j < nCols; ++j) {
                    buttons[i][j] = new ButtonWithCoordinates("        ", i, j);
                    buttons[i][j].addActionListener(this);
                }
            }
        } else {
            throw new IllegalArgumentException("Illegal array dimensions!!!");
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {

        // TODO Auto-generated method stub
        ButtonWithCoordinates button = (ButtonWithCoordinates) e.getSource();
        button.setText(button.getCoordX() + ", " + button.getCoordY());

    }

    public void GUI() {

        if (buttons == null) { throw new NullPointerException("Array is not initialized!!!"); }

        frame = new JFrame();
        panel = new JPanel();

        frame.setContentPane(panel);
        panel.setLayout(new GridLayout(nRows, nCols));
        for (int i=0; i < nRows; ++i) {
            for (int j=0; j < nCols; ++j) {
                panel.add(buttons[i][j]);
            }
        }

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);

    }

    public static void main(String[] args) {

        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new ButtonsArray(3, 5).GUI();
            }
        });         

    }

}

现在我的问题：

1. 我是否一直在这里重新发明轮子？我的意思是，是否有更简单的方法来实现相同的目标？

1. Have I been reinventing the wheel here? I mean, is there a more straightforward way to achieve the same?

每次我们需要找到时，它是否都不如搜索数组坐标？

Is it in any way inferior to searching through the array each time we need to find the coordinates?

推荐答案

原始示例使用扩展程序的stackoverflow.com/revisions/7706684/1>版本：

The original version of this example used extension:

GridButton extends JButton

更新的版本取决于所见的讨论此处。虽然在某些情况下扩展可能是合适的，但此处提及了一些替代方案。客户端属性特别方便。从网格坐标中识别按钮也很容易：

The updated version was predicated on the colloquy seen here. While extension may be appropriate in some contexts, a few alternatives are mentioned here; a client property is particularly convenient. Identifying a button from its grid coordinates is also easy:

private static final int N = 5;
List<JButton> list = new ArrayList<>();
…
private JButton getGridButton(int r, int c) {
    int index = r * N + c;
    return list.get(index);
}

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