的Java：GridBagLayout的混亂

Question

這是我在這裏的第一個問題，所以請原諒我，當我違反任何規則，或者不使用

我創造的Java Swing一個簡單的形式，它由1的JLabel的正確的格式，1周的JTextField和1個按鈕

|---------------------------| 
|       | 
|   JLabel   | 
|       | 
|---------------------------| 
| JTextField | Button | 
|---------------------------| 

的按鈕應該在右下角，JTextField的離開它，選擇JLabel頂部，跨越兩列

我想該按鈕被一個固定的大小，JTextField固定的高度，但使用完整的widt h（按鈕使用的除外）和JLabel使用所有其他空間（使用和高度）

我甚至不確定是否應該使用GridBagLayout或另一個佈局？

這可能是一個非常簡單的問題，但讓我困惑了很長一段時間（與GridBarLayout我想太多的選擇）

Answer 1

OK是一個演示代碼，應該讓你去：

import java.awt.Color; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 

import javax.swing.BorderFactory; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 
import javax.swing.SwingUtilities; 

public class TestGridBagLayout { 

    protected void initUI() { 
     JFrame frame = new JFrame(TestGridBagLayout.class.getSimpleName()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JButton button = new JButton("A button"); 
     JTextField textField = new JTextField(); 
     JLabel label = new JLabel("A cool long nice label that will stretch."); 
     label.setHorizontalAlignment(JLabel.CENTER); 
     label.setBorder(BorderFactory.createLineBorder(Color.GREEN)); 
     JPanel panel = new JPanel(new GridBagLayout()); 
     GridBagConstraints gbc = new GridBagConstraints(); 
     gbc.fill = GridBagConstraints.BOTH;// Fill the "cell" in both direction 
     gbc.weightx = 1.0;// Allocate extra-width to the label 
     gbc.weighty = 1.0;// Allocate extra-height to the label 
     gbc.gridwidth = GridBagConstraints.REMAINDER;// The label takes all the available width of the "row" 
     panel.add(label, gbc); 

     gbc.weighty = 0; // Don't stretch TF vertically 
     gbc.fill = GridBagConstraints.HORIZONTAL; // Fill horizontally 
     gbc.gridwidth = GridBagConstraints.RELATIVE; 
     panel.add(textField, gbc); 
     gbc.weightx = 0; // No extra horizontal space is given to the button 
     gbc.fill = GridBagConstraints.NONE; // No fill for the button 
     panel.add(button, gbc); 
     frame.add(panel); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) { 
     SwingUtilities.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       new TestGridBagLayout().initUI(); 
      } 
     }); 
    } 

} 

Answer 2

首先，您面板的佈局設置爲GridBagLayout。

然後，創建一個GridBagConstraints對象並將填充設置爲GridBagConstraints.BOTH。

對於JLabel，請在約束對象上設置以下屬性：gridx = 0, gridy = 0, gridwidth = 2, gridheight = 2, weightx = 1, weighty = 1。

對於JTextField，請在約束對象上設置以下屬性：gridx = 0, gridy = 1, gridwidth = 1, gridheight = 1, weightx = 1, weighty = 0。

對於JButton，請在約束對象上設置以下屬性：gridx = 1, gridy = 1, gridwidth = 1, gridheight = 1, weightx = 0, weighty = 0。

Answer 3

類BorderLayout易於使用，比GridBagLayout功能弱。

但是當事情很簡單時，解決方案必須相同。這裏

panel.add(label, BorderLayout.CENTER); 
JPanel south = new JPanel(); 
south.add(textfield); 
south.add(button); 
button.setPreferredSize(x, y); 
panel.add(south, BorderLayout.SOUTH); 

Answer 4

我不知道這是做一個平常的事情，但下面是其工作代碼（主要是代碼丹和紀堯姆）

//show stuff 
    setLayout(new GridBagLayout()); 
    GridBagConstraints c = new GridBagConstraints(); 
    //show label 
    c.fill = GridBagConstraints.BOTH;   // Fill the "cell" in both direction 
    c.weightx = 1.0;       // Allocate extra-width to the label 
    c.weighty = 1.0;       // Allocate extra-height to the label 
    c.gridwidth = GridBagConstraints.REMAINDER; // The label takes all the available width of the "row" 
    add(mlblShow,c); 
    //show cmd txt 
    c.weighty = 0;        // Don't stretch TF vertically 
c.fill = GridBagConstraints.BOTH;   // Fill horizontally and vertically 
c.gridwidth = GridBagConstraints.RELATIVE; 
    add(mtxtCmd,c); 
    //show send button 
    c.weightx = 0;        // No extra horizontal space is given to the button 
c.fill = GridBagConstraints.NONE;   // No fill for the button 
    add(cmdSend,c);