java GridBagLayout 锚点
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java GridBagLayout anchor
提问by user595234
Learing GridBagLayout, The issue here is, the name label and combox don't show up on the top of the panel, but I have set its anchor to NORTH. Why ?
学习GridBagLayout，这里的问题是，面板顶部没有显示名称标签和组合框，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();
}
}
回答by aioobe
You have to change
你必须改变
gridBagConstraints.weighty = 0.0;
to
到
gridBagConstraints.weighty = 1.0;
otherwise the area reserved for the component is slimmed to the size of the component, and it doesn't matter in which direction you "anchor" the component.
否则，为组件保留的区域会缩小到组件的大小，并且“锚定”组件的方向无关紧要。
The result after changing the weightyis the following:
更改后的结果weighty如下：
