即使指定了 .weightx、.weighty 和 .anchor,GridBagConstraint 也不起作用。 我需要将组件设置在左上角,但它一直设置在屏幕中央。以下是我定位组件的方法。
private void initGUI(){
getContentPane().setLayout(new GridBagLayout());
JPanel panel = new JPanel();
panel.setPreferredSize(new Dimension(450, 450));
Box buttonBox = Box.createVerticalBox();
ButtonGroup buttons = new ButtonGroup();
buttons.add(okOnly);
buttons.add(okCancel);
buttons.add(yesNoCancel);
buttons.add(yesNo);
buttonBox.add(okOnly);
buttonBox.add(okCancel);
buttonBox.add(yesNoCancel);
buttonBox.add(yesNo);
buttonBox.setBorder(BorderFactory.createTitledBorder("Buttons"));
GridBagConstraints gridConstraints = new GridBagConstraints();
gridConstraints.gridx = 0;
gridConstraints.gridy = 0;
gridConstraints.anchor = GridBagConstraints.NORTHWEST;
gridConstraints.weightx = 1;
gridConstraints.weighty = 1;
panel.add(buttonBox, gridConstraints);
getContentPane().add(panel);
}
最佳答案
您将 GridBagLayout 赋予 contentPane,但在没有 GridBagConstraints 的情况下向其添加组件,然后为面板 JPanel 赋予无布局,以便它使用默认的 FlowLayout,并添加组件使用 GridBagConstraints 对其进行修改,这些约束在这种情况下没有任何意义。
解决方案:显然不要这样做。仅在将组件添加到使用 GridBagLayout 的容器时才使用 GridBagConstraints。
事实上,如果您只需要左上角的 JRadioButtons 集合,我会简单地删除面板 JPanel:
import java.awt.*;
import javax.swing.*;
public class Gui extends JFrame {
private JRadioButton okOnly = new JRadioButton("Ok ");
private JRadioButton okCancel = new JRadioButton("Ok Cancel");
private JRadioButton yesNoCancel = new JRadioButton("Yes No Cancel");
private JRadioButton yesNo = new JRadioButton("Yes No");
private void initGUI() {
setDefaultCloseOperation(EXIT_ON_CLOSE);
getContentPane().setLayout(new GridBagLayout());
// JPanel panel = new JPanel();
// panel.setPreferredSize(new Dimension(450, 450));
setPreferredSize(new Dimension(450, 450));
Box buttonBox = Box.createVerticalBox();
ButtonGroup buttons = new ButtonGroup();
buttons.add(okOnly);
buttons.add(okCancel);
buttons.add(yesNoCancel);
buttons.add(yesNo);
buttonBox.add(okOnly);
buttonBox.add(okCancel);
buttonBox.add(yesNoCancel);
buttonBox.add(yesNo);
buttonBox.setBorder(BorderFactory.createTitledBorder("Buttons"));
GridBagConstraints gridConstraints = new GridBagConstraints();
gridConstraints.gridx = 0;
gridConstraints.gridy = 0;
gridConstraints.anchor = GridBagConstraints.NORTHWEST;
gridConstraints.weightx = 1;
gridConstraints.weighty = 1;
// panel.add(buttonBox, gridConstraints);
add(buttonBox, gridConstraints);
// getContentPane().add(panel);
pack();
setLocationRelativeTo(null);
setVisible(true);
}
private static void createAndShowGui() {
new Gui().initGUI();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}
关于java - GridBagConstraints 未正确对齐 JRadioButton 框,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39840703/