面板佔用相等的空間

我有兩個面板。第一個看起來像這樣。面板佔用相等的空間

public class BoardPanel extends JPanel 
{ 
    public BoardPanel() 
    { 
     setLayout(null); 
     this.setOpaque(false); 

     Button button = new JButton(".."); 
     button.setLocation(...); 
     button.setSize(...); 
     add(button); 
    } 

    public void paintComponent(Graphics g) 
    { 
     /* 
     * Painting some stuff here. 
     */ 
    } 
}

其他面板是這樣的：

public class OtherPanel extends JPanel 
{ 
    public OtherPanel() 
    { 
     super(); 
     this.setLayout(null); 
     this.setOpaque(false); 

     JPanel panel1 = new JPanel(); 
     panel1.setLocation(...); 
     panel1.setSize(...); 
     panel1.setOpaque(..); 

     JPanel panel2 = new JPanel(); 
     panel2.setLocation(...); 
     panel2.setSize(...); 
     panel2.setOpaque(..); 

     add(panel1): 
     add(panel2); 
    } 

}

在那之後，我把我的兩個面板在框架中。但是我希望我的BoardPanel佔據比OtherPanel更多的屏幕。所以我用的GridBagLayout的框架

public class MainFrame extends JFrame 
{ 
    private GridBagLayout aGridLayout = new GridBagLayout(); 
    private GridBagConstraints constraints = new GridBagConstraints(); 

    public MainFrame() 
    { 
     super("Quoridor"); 
     setLayout(gridLayout); 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 
     setSize(1366, 768); 
     setVisible(true); 
     setResizable(false); 
     this.getContentPane().setBackground(Color.decode("#b2a6a6")); 

     BoardPanel boardPanel = new BoardPanel(); 
     OtherPanel otherPanel = new OtherPanel(); 

     this.addComponent(boardPanel, 1, 1, 2, 1); 
     this.addComponent(otherPanel, 1, 3, 1, 1); 
    } 

    public void addComponent(Component component , int row , int column , int width 
      , int height) 
    { 
     constraints.gridx = column; 
     constraints.gridy = row; 
     constraints.gridwidth = width; 
     constraints.gridheight = height; 
     aGridLayout.setConstraints(component, constraints); 
     add(component); 
    } 
}

的問題是，該框架給予同等的空間來同時面板，不給boardPanel給予更多的空間。這是怎麼回事？做它必須做的面板的界限？

來源

2017-07-19 Joan Plepi

這是關於GridBagLayout的一個很好的教程：https://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html。另請參閱下面的代碼和截圖。錨場將組件定位在第一行。 weightx字段爲boardPanel的列提供更多空間。 ipady字段指定添加到組件高度的多少。在這裏，boardPanel獲得大部分寬度和所有高度。其他面板面板的高度爲一半。

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

public class GridExample { 
    private JFrame mainFrame; 
    private JPanel boardPanel, otherPanel; 

    public GridExample(){ 
     mainFrame = new JFrame(); 
     mainFrame.setSize(600,400); 
     mainFrame.setLayout(new GridBagLayout()); 
     GridBagConstraints c = new GridBagConstraints(); 

     mainFrame.addWindowListener(new WindowAdapter() { 
      public void windowClosing(WindowEvent windowEvent){ 
       System.exit(0); 
      }   
     });  

     boardPanel = new JPanel(); 
     boardPanel.add(new JLabel("board panel")); 
     boardPanel.setBackground(Color.yellow); 

     otherPanel = new JPanel(); 
     otherPanel.add(new JLabel("other panel")); 
     otherPanel.setBackground(Color.green); 

     c.anchor = GridBagConstraints.FIRST_LINE_START; 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.weightx = 0.75; 
     c.ipady = 400; 
     c.gridx = 0; 
     c.gridy = 0; 
     mainFrame.add(boardPanel, c); 

     c.anchor = GridBagConstraints.FIRST_LINE_START; 
     c.fill = GridBagConstraints.HORIZONTAL; 
     c.weightx = 0.25; 
     c.ipady = 200; 
     c.gridx = 1; 
     c.gridy = 0;  
     mainFrame.add(otherPanel, c); 
     mainFrame.setVisible(true); 
    } 

    public static void main(String[] args){ 
     GridExample swingContainerDemo = new GridExample(); 
    } 
}

來源

2017-07-19 17:10:33

面板佔用相等的空間

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