学习GridBagLayout,这里的问题是,名称标签和combox没有显示在面板的顶部,但我已将其锚点设置为NORTH.为什么?
import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.WindowConstants; public class Test2 { public Test2() { JFrame frame = new JFrame(); frame.setTitle("test"); frame.getContentPane().setLayout(new GridLayout(1,2)); frame.setSize(800,600); JPanel panel1 = new JPanel(); panel1.setLayout(new GridBagLayout()); JLabel label = new JLabel("name"); GridBagConstraints gridBagConstraints = new GridBagConstraints(); gridBagConstraints.anchor = GridBagConstraints.NORTH; gridBagConstraints.weightx = 0.0; gridBagConstraints.weighty = 0.0; gridBagConstraints.gridx = 0; gridBagConstraints.gridy = 0; panel1.add(label,gridBagConstraints); String[] petStrings = { "Bird","Cat","Dog","Rabbit","Pig" }; JComboBox petList = new JComboBox(petStrings); gridBagConstraints = new GridBagConstraints(); gridBagConstraints.anchor = GridBagConstraints.NORTH; gridBagConstraints.fill = GridBagConstraints.HORIZONTAL; gridBagConstraints.weightx = 1.0; gridBagConstraints.weighty = 0.0; gridBagConstraints.gridx = 1; gridBagConstraints.gridy = 0; panel1.add(petList,gridBagConstraints); frame.getContentPane().add(panel1); frame.getContentPane().add(new JPanel()); frame.setVisible(true); frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } public static void main(String[] args) { new Test2(); } }
解决方法
你必须改变
gridBagConstraints.weighty = 0.0;
至
gridBagConstraints.weighty = 1.0;
否则为组件保留的区域会缩小到组件的大小,并且无论您在哪个方向“锚定”组件.
改变重量后的结果如下:
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