java - GridBagConstraints 如何处理重叠对象？

Question

此代码生成三个按钮。按钮“一”出现在“北”并部分覆盖位于东的按钮“二”。按钮三出现在西南方。如何获得按钮 1 和 2 重叠但没有按钮 3 的相同布局？

import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;

public class GridBagButtons {
  private static final Insets insets = new Insets(0, 0, 0, 0);

  public static void main(final String args[]) {
    final JFrame frame = new JFrame("GridBagLayout");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new GridBagLayout());
    JButton button;
    // Row One - Three Buttons
    button = new JButton("One");
    addComponent(frame, button, 0, 0, 2, 1, GridBagConstraints.CENTER, GridBagConstraints.BOTH);
    button = new JButton("Two");
    addComponent(frame, button, 1, 0, 1, 2, GridBagConstraints.CENTER, GridBagConstraints.BOTH);

   button = new JButton("Three");
   addComponent(frame, button, 0, 1, 1, 1, GridBagConstraints.CENTER, GridBagConstraints.BOTH);  //Comment out this

    frame.setSize(500, 200);
    frame.setVisible(true);
  }
  private static void addComponent(Container container, Component component, int gridx, int gridy,
      int gridwidth, int gridheight, int anchor, int fill) {
    GridBagConstraints gbc = new GridBagConstraints(gridx, gridy, gridwidth, gridheight, 1.0, 1.0,
     anchor, fill, insets, 0, 0);
    container.add(component, gbc);
    }
    }

注释按钮三会更改布局。按钮一完全覆盖按钮二。 [修改]代码来自这里http://www.java2s.com/Tutorial/Java/0240__Swing/UsingGridBagConstraints.htm

Answer 1

尝试在 GridBagLayout 构造函数中显式设置网格大小。

即

frame.setLayout(new GridBagLayout(2, 2));