GridBagLayOut跨越列向上？

Question

我可以在GridBagLayout中向上或向后跨越按钮吗？ 这里，按钮五的高度是2，宽度是1，但它不起作用。有一个空间向上，这是我想要按钮五向上的空间。

public class GridBag2 extends JPanel 
{ 
    GridBagConstraints constraints = new GridBagConstraints(); 

    public static void main (String args []) 
    { 
     JFrame fr = new JFrame("GridBag2 Span R&C"); 
     fr.setDefaultCloseOperation(fr.EXIT_ON_CLOSE); 
     fr.setSize(600,600); 
     fr.add(new GridBag2()); 
     fr.setVisible(true); 

    } 

    GridBag2() 
    { 
     setLayout(new GridBagLayout()); 
     constraints.fill=GridBagConstraints.BOTH; 
     addGB(new JButton("one"),0,0,1.0,1.0,1,1); 
     addGB(new JButton("two"),1,0,1.0,1.0,1,1); 
     addGB(new JButton("three"),2,0,1.0,1.0,1,1); 
     addGB(new JButton("four"),1,1,1,1,1,2); //spans 2 rows 
     addGB(new JButton("five"),0,2,1,1,2,1); //spans 2 columns 

    } 

    void addGB(Component comp,int gx, int gy, double wx, double wy, int h, int w) 
    { 
     constraints.gridx=gx; 
     constraints.gridy=gy; 
     constraints.weightx=wx; 
     constraints.weighty=wy; 
     constraints.gridheight=h; 
     constraints.gridwidth=w; 
     this.add(comp,constraints); 
    } 
} 

Answer 1

根据你的意见，你是通过你的工厂方法没有意义

addGB(new JButton("four"),1,1,1,1,1,2); //spans 2 rows 
addGB(new JButton("five"),0,2,1,1,2,1); //spans 2 columns 

基本上你是说你想跨越2行的坐标...，然后跨越2列，但参数是南辕北辙......

addGB(new JButton("four"),1,1,1,1,2,1); //spans 2 rows 
addGB(new JButton("five"),0,2,1,1,1,2); //spans 2 columns 

会导致你的意见要求，例如...

import java.awt.Component; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 

public class GridBag2 extends JPanel { 

    GridBagConstraints constraints = new GridBagConstraints(); 

    public static void main(String args[]) { 
     JFrame fr = new JFrame("GridBag2 Span R&C"); 
     fr.setDefaultCloseOperation(fr.EXIT_ON_CLOSE); 
     fr.setSize(600, 600); 
     fr.add(new GridBag2()); 
     fr.setVisible(true); 

    } 

    GridBag2() { 
     setLayout(new GridBagLayout()); 
     constraints.fill = GridBagConstraints.BOTH; 
     addGB(new JButton("one"), 0, 0, 1.0, 1.0, 1, 1); 
     addGB(new JButton("two"), 1, 0, 1.0, 1.0, 1, 1); 
     addGB(new JButton("three"), 2, 0, 1.0, 1.0, 1, 1); 
     addGB(new JButton("four"), 1, 1, 1, 1, 2, 1); //spans 2 rows 
     addGB(new JButton("five"), 0, 2, 1, 1, 1, 2); //spans 2 columns 

    } 

    void addGB(Component comp, int gx, int gy, double wx, double wy, int h, int w) { 
     constraints.gridx = gx; 
     constraints.gridy = gy; 
     constraints.weightx = wx; 
     constraints.weighty = wy; 
     constraints.gridheight = h; 
     constraints.gridwidth = w; 
     this.add(comp, constraints); 
    } 
} 

但是，别急，什么发生在第二/第三排？第二行基本崩溃，它不再包含任何东西（可用于计算可行高度）

您可以通过使用“空白”组件来解决此问题，这将有助于它做出决定......

import java.awt.Component; 
import java.awt.GridBagConstraints; 
import java.awt.GridBagLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 

public class GridBag2 extends JPanel { 

    GridBagConstraints constraints = new GridBagConstraints(); 

    public static void main(String args[]) { 
     JFrame fr = new JFrame("GridBag2 Span R&C"); 
     fr.setDefaultCloseOperation(fr.EXIT_ON_CLOSE); 
     fr.setSize(600, 600); 
     fr.add(new GridBag2()); 
     fr.setVisible(true); 

    } 

    GridBag2() { 
     setLayout(new GridBagLayout()); 
     constraints.fill = GridBagConstraints.BOTH; 
     addGB(new JButton("one"), 0, 0, 1.0, 1.0, 1, 1); 
     addGB(new JButton("two"), 1, 0, 1.0, 1.0, 1, 1); 
     addGB(new JButton("three"), 2, 0, 1.0, 1.0, 1, 1); 
     addGB(new JLabel(), 0, 1, 1, 1, 1, 1); //spans 2 rows 
     addGB(new JButton("four"), 1, 1, 1, 1, 2, 1); //spans 2 rows 
     addGB(new JButton("five"), 0, 2, 1, 1, 1, 2); //spans 2 columns 

    } 

    void addGB(Component comp, int gx, int gy, double wx, double wy, int h, int w) { 
     constraints.gridx = gx; 
     constraints.gridy = gy; 
     constraints.weightx = wx; 
     constraints.weighty = wy; 
     constraints.gridheight = h; 
     constraints.gridwidth = w; 
     this.add(comp, constraints); 
    } 
}