Question

我正在努力完成以下任务：

JFrame底部的页脚，有两个组件：左侧为JLabel，右侧为内部有三个按钮的面板
我希望右侧按钮面板占用尽可能小的空间，同时JLabel填充主机JFrame的宽度减去按钮面板的宽度。
JLabel周围有一个斜面边框，按钮不是
按钮旁边没有空格

我一直在测试各种Swing布局以实现这一点，但到目前为止还没有运气。目前我正在按照教程尝试GridBagConstraints;这是现在的样子：

你可以看到它不起作用，我不知道为什么。

这是我目前的代码：

public class MessageFooter extends JPanel {

  private static final int BORDER_WIDTH = 5;

  private final JLabel _recentMessage = new JLabel();

  private int _footerHeight;

  /*package*/ MessageFooter() {

    // Set the size of the footer
    _footerHeight = FlowFramePrefs.getUserPrefFontSize() + (BORDER_WIDTH * 2);

    this.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);

    GridBagConstraints c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;

    this.setMaximumSize(new java.awt.Dimension(java.lang.Integer.MAX_VALUE, _footerHeight));
    this.setMinimumSize(new java.awt.Dimension(0, _footerHeight));
    this.setPreferredSize(new Dimension(_footerHeight, _footerHeight));
    this.setLayout(new BoxLayout(this, BoxLayout.X_AXIS));

    // JLabel
    JPanel labelPanel = new JPanel();
    _recentMessage.setText("   Blahhhhh");
    labelPanel.add(_recentMessage);//, BorderLayout.CENTER);
    labelPanel.setBorder(new BevelBorder(BevelBorder.LOWERED));
    //_recentMessage.setAlignmentX(Component.LEFT_ALIGNMENT);

    // Buttons
    JPanel buttonPanel = new JPanel();
    buttonPanel.setBorder(new EmptyBorder(0, 0, 0, 0));
    //buttonPanel.setAlignmentX(Component.RIGHT_ALIGNMENT);
    // Create the buttons
    JButton upprB = new JButton("U");
    upprB.setMargin(new Insets(0, 0, 0, 0));
    upprB.setBorder(new EmptyBorder(0, 0, 0, 0));
    JButton downB = new JButton("D");
    downB.setMargin(new Insets(0, 0, 0, 0));
    downB.setBorder(new EmptyBorder(0, 0, 0, 0));
    JButton openB = new JButton("O");
    openB.setMargin(new Insets(0, 0, 0, 0));
    openB.setBorder(new EmptyBorder(0, 0, 0, 0));
    buttonPanel.add(upprB);
    buttonPanel.add(downB);
    buttonPanel.add(openB);

    // Add both
    c.weightx = 1.0;
    c.gridx = 0;
    c.gridy = 0;
    this.add(labelPanel, c);
    c.weightx = 0.0;
    c.gridx = 1;
    c.gridy = 0;
    this.add(buttonPanel, c);
  }

 ...

}

Answer 1

＆＃34;页脚＆＃34;面板应为for i in a: i.replace('\t',' ') print i。

然后你创建一个＆＃34;按钮＆＃34;面板并将按钮添加到该面板。然后，此面板将添加到＆＃34; BorderLayout.LINE_END＆＃34;页脚面板。这意味着按钮将全部以其首选尺寸显示。

然后将标签添加到＆＃34; BorderLayout.CENTER＆＃34;页脚面板。标签现在将占用所有可用的剩余空间。

类似的东西：

BorderLayout

Answer 2

基于@camickr的回答，我创建了一个例子：

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.BevelBorder;

public class MessageFooter extends JFrame {

    public MessageFooter() {

        setLayout(new BorderLayout());

        JPanel footer = new JPanel();
        footer.setLayout(new BorderLayout());

        JPanel buttonPanel = new JPanel();
        buttonPanel.setLayout(new GridLayout(1,3));

        JPanel labelPanel = new JPanel();
        labelPanel.setBorder(new BevelBorder(BevelBorder.LOWERED));

        JButton u = new JButton("U");
        u.setMargin(new Insets(0,0,0,0));

        JButton d = new JButton("D");
        d.setMargin(new Insets(0,0,0,0));

        JButton o = new JButton("O");
        o.setMargin(new Insets(0,0,0,0));

        JLabel label = new JLabel("Sample Text");

        buttonPanel.add(u);
        buttonPanel.add(d);
        buttonPanel.add(o);
        labelPanel.add(label);
        footer.add(labelPanel, BorderLayout.CENTER);
        footer.add(buttonPanel, BorderLayout.LINE_END);

        add(footer, BorderLayout.SOUTH);    
        setSize(500,500);
        setVisible(true);

    }

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

Answer 3

Try using absolute layout i.e this.setLayout(null) now you can give specified amount space to each of the components you are using.

Supposing that the MessageFooter is of Dimensions - 1000(width), 50(height)

Now that the layout of MessageFooter is null, we can set the positions of the buttons or as well as the buttonPanel

this.setLayout(null);
this.setSize(new Dimension(1000,50));
labelPanel.setBounds(0,0,800,50);
buttonPanel.setBounds(800,0,200,50);

for further details you can go through this documentation

如何使用两个并排组件使一个组件占用尽可能小的空间？

3 个答案: