Java图形化界面设计——布局管理器之GridBagLayout

Posted 2020-08-31 Wolf

GridBagLayout 不会随着窗口的变化标签随之发生变化，可固定。

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import java.awt.Button;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class GridBagEx2 extends  JPanel
{
    private static final long serialVersionUID = -5214441555967215113L;
 
    protected void makebutton(String name, GridBagLayout gridbag,
            GridBagConstraints c)
    {
        Button button = new Button(name);
        gridbag.setConstraints(button, c);
        add(button);
    }
 
    public void init()
    {
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints c = new GridBagConstraints();
 
        setFont(new Font("SansSerif", Font.PLAIN, 14));
        setLayout(gridbag);
 
        c.fill = GridBagConstraints.BOTH;
        c.weightx = 1.0;
        makebutton("Button1", gridbag, c);
        makebutton("Button2", gridbag, c);
        makebutton("Button3", gridbag, c);
 
        c.gridwidth = GridBagConstraints.REMAINDER; //end row
        makebutton("Button4", gridbag, c);
 
        c.weightx = 0.0; //reset to the default
        makebutton("Button5", gridbag, c); //another row
 
        c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
        makebutton("Button6", gridbag, c);
 
        c.gridwidth = GridBagConstraints.REMAINDER; //end row
        makebutton("Button7", gridbag, c);
 
        c.gridwidth = 1; //reset to the default
        c.gridheight = 2;
        c.weighty = 1.0;
        makebutton("Button8", gridbag, c);
 
        c.weighty = 0.0; //reset to the default
        c.gridwidth = GridBagConstraints.REMAINDER; //end row
        c.gridheight = 1; //reset to the default
        makebutton("Button9", gridbag, c);
        makebutton("Button10", gridbag, c);
 
        setSize(300, 100);
    }
 
    public static void main(String args[])
    {
        JFrame f = new JFrame("GridBag Layout Example");
        f.setLocation(400, 200);
        GridBagEx2 ex1 = new GridBagEx2();
 
        ex1.init();
 
        f.add("Center", ex1);
        f.pack();
        f.setSize(f.getPreferredSize());
        f.setVisible(true);
        f.addWindowListener(new WindowAdapter()
        {
 
            @Override
            public void windowClosing(WindowEvent e)
            {
                System.exit(0);
            }
             
        });
    }
 
}