java - 在按钮的相对位置添加 JLabel

Question

好的，这是我到目前为止的相关代码。

  for (int i = gameLines - 1; i > 0; i--)
  {
     for (int j = 0; j < i; j++)
     {
        JButton jButton = new JButton();
        jButton.setSize(buttonWidth, buttonHeight);
        jButton.setText("" + line[i].charAt(j));
        int x = ((buttonWidth / 2 * gameLines + 1) - (buttonWidth / 2 * i) + (buttonWidth * j));
        int y = (gameLines - (i + 1)) * buttonHeight;
        jButton.setLocation(x, y);
        panel.add(jButton);
        button[i][j] = jButton;
        button[i][j].setActionCommand(Integer.toString(i) + "." + Integer.toString(j));
        button[i][j].addActionListener(this);
     }
  }

该代码创建所有按钮并将其放置在我想要的位置。这花了我一段时间才弄清楚。我本来是一名 AppleSoft BASIC 程序员，对于 i 和 j 变量名我感到很抱歉。

现在来玩玩吧。在底部 3 行按钮的右侧，我想放置一个 jLabel。 jLabel 的右边缘与顶行最右边按钮的右边缘对齐。每个文本中的文本将右对齐，以 : 和最多 4 位数字结尾。

我想我可以像计算按钮位置一样简单地计算位置。我将根据 switch/case 添加文本。

我在理解 JLabels 时遇到了困难，因此我希望能获得任何帮助。

我目前的想法是:插入到j循环之后

if (i < 4)
{
    JLabel jLable = new JLabel();
    JLabel.setSize(???, buttonHeight);
    Calculate value of X;
    int y = (gameLines - (i +1)) * buttonHeight;
    jLabel.setLocation(x,y);
    switch (i)
    {
       case 3:
          jLabel.setText("Buttons Clicked: " + buttonsClicked);
          break;
       case 2:
          etc.
    }
    panel.add(jLabel);
}

请帮忙

Answer 1

出于多种原因，我会避免绝对布局。当您在其他 PC 上运行它时，整个事情就开始崩溃，相反，您应该依赖 Swing 中提供的布局管理器 API。

以下示例使用复合布局方法。每一行都是它自己的容器 (JPanel)，然后每一行都会添加到主面板。

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class ButtonPyramid {

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

    public ButtonPyramid() {
        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 String[] lines;

        public TestPane() {
            lines = new String[]{
                "AAFITQPNXBE",
                "?AXOPKMSUR",
                "TGKFREUDI",
                "DFEAAEOY",
                "ZDE?VIF",
                "G@RMLC",
                "YUJGO",
                "NSCP",
                "KO@",
                "MI",
                "Y",
                "B",
            };

            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.weightx = 1;
            gbc.gridy = 1;
            gbc.gridx = 0;
            for (String line : lines) {
                JPanel panel = new JPanel(new GridBagLayout());
                for (char ch : line.toCharArray()) {
                    JButton btn = new JButton(Character.toString(ch));
                    btn.setMargin(new Insets(10, 10, 10, 10));
                    panel.add(btn);
                }
                add(panel, gbc);
                gbc.gridy++;
            }
            JLabel label = new JLabel(":1234");
            gbc.gridy -= 3;
            gbc.gridx++;
            gbc.anchor = GridBagConstraints.NORTH;
            add(label, gbc);
        }
    }

}

如果您不希望文本占据另一列，您可以尝试一个小技巧，将标签布局约束更改为如下所示...

JLabel label = new JLabel(":1234");
gbc.gridy -= 3;
gbc.anchor = GridBagConstraints.NORTHEAST;
add(label, gbc);

查看Laying out Components within a Container了解想法和细节

           lines = new char[][]{...};

           for (int outter = 0; outter < lines.length; outter++) {
                JPanel panel = new JPanel(new GridBagLayout());
                for (int inner = 0; inner < lines[outter].length) {
                    char ch = lines[outter][inner];
                    JButton btn = new JButton(Character.toString(ch));
                    btn.setMargin(new Insets(10, 10, 10, 10));
                    panel.add(btn);
                }
                add(panel, gbc);
                gbc.gridy++;
            }