学习GridBagLayout,这里的问题是,名称标签和com@R_301_460@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.JCombo@R_301_460@;
- 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" };
- JCombo@R_301_460@ petList = new JCombo@R_301_460@(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: