一列布局不使用窗口的全角

Question

我想創建一個佈局：2行，1列。第一排佔窗戶高度的70％，第二排佔窗戶的30％。我通過使用GridBagConstraints的weighty屬性來實現此目的。

但是，我的組件的寬度有問題，因爲當我調整應用程序窗口大小時，組件的寬度保持不變，並且在組件的左側和右側得到一個空白區域（即使我設置爲fill至BOTH）。當我改變窗口的高度時，不會發生這個問題（組件調整得非常好，並填充窗口的整個高度）。

下面我約束：

firstConstraints.gridx = 0; 
firstConstraints.gridy = 0; 
firstConstraints.weighty = 0.7; 
firstConstraints.fill = GridBagConstraints.BOTH; 

secondConstraints.gridx = 0; 
secondConstraints.gridy = 1; 
secondConstraints.weighty = 0.3; 
secondConstraints.fill = GridBagConstraints.BOTH; 

Answer 1

我覺得你還需要：

gbc.weightx = 1.0; 

請參見從How to Use a GrigBagLayout Swing的教程，談到了的weightx，沉重的約束secton。

Answer 2

簡單的例子

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

public class BorderPanels extends JFrame { 

    private static final long serialVersionUID = 1L; 

    public BorderPanels() { 
     getContentPane().setLayout(new GridBagLayout()); 
     GridBagConstraints gbc = new GridBagConstraints(); 
     JPanel panel1 = new JPanel(); 
     Border eBorder = BorderFactory.createEtchedBorder(); 
     panel1.setBorder(BorderFactory.createTitledBorder(eBorder, "70pct")); 
     gbc.gridx = gbc.gridy = 0; 
     gbc.gridwidth = gbc.gridheight = 1; 
     gbc.fill = GridBagConstraints.BOTH; 
     gbc.anchor = GridBagConstraints.NORTHWEST; 
     gbc.weightx = gbc.weighty = 70; 
     getContentPane().add(panel1, gbc); 
     JPanel panel2 = new JPanel(); 
     panel2.setBorder(BorderFactory.createTitledBorder(eBorder, "30pct")); 
     gbc.gridy = 1; 
     gbc.weightx = 30; 
     gbc.weighty = 30; 
     gbc.insets = new Insets(2, 2, 2, 2); 
     getContentPane().add(panel2, gbc); 
     pack(); 
    } 

    public static void main(String[] args) { 
     new BorderPanels().setVisible(true); 
    } 
}