【发布时间】：2022-12-28 11:58:37
【问题描述】：
我正在尝试使用 GridBagLayout 创建布局，但无法使 JButton 控件之间的空间相等。第一行有 5 个按钮，中间没有空格。第二行和第三行应该有 4 个按钮，它们之间的空间较小。
我尝试的解决方法是将其设为 35x35 网格，其中顶部按钮的宽度为 7，其他按钮的宽度为 5。我不知道如何让 4 个按钮均匀对齐（最后一列中的空间较小）。
代码如下：
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JColorChooser;
import javax.swing.JDialog;
import javax.swing.colorchooser.AbstractColorChooserPanel;
import java.awt.Insets;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
public class MainTwo {
public static void main(String[] a) {
final JColorChooser colorChooser = new JColorChooser();
MyChooserPanel newChooser = new MyChooserPanel();
colorChooser.addChooserPanel(newChooser);
ActionListener okActionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println(colorChooser.getColor());
}
};
ActionListener cancelActionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("Cancel");
}
};
final JDialog dialog = JColorChooser.createDialog(null, "Change Button Background", true, colorChooser,
okActionListener, cancelActionListener);
dialog.setVisible(true);
}
}
class MyChooserPanel extends AbstractColorChooserPanel {
public void buildChooser() {
setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.NONE;
c.ipadx = 21;
c.ipady = 15;
c.gridwidth = 7;
makeAddButton("Black", Color.BLACK, c);
makeAddButton("Dark Grey", Color.PINK, c);
makeAddButton("Custom PathVisio Grey", Color.YELLOW, c);
makeAddButton("Grey", Color.CYAN, c);
makeAddButton("White", Color.WHITE, c);
c.ipadx = 15;
c.gridwidth = 5;
c.insets = new Insets(10,0,0,0);
c.gridy = 1; // new row
makeAddButton("Blue", Color.BLUE, c);
c.gridx = 10;
makeAddButton("Green", Color.GREEN, c);
c.gridx = 20;
makeAddButton("Purple", Color.MAGENTA, c);
c.gridx = 30;
makeAddButton("Orange", Color.ORANGE, c);
c.gridy = 2; // new row
c.gridx = 0;
makeAddButton("Dark Blue", Color.BLUE, c);
c.gridx = 10;
makeAddButton("Dark Green", Color.GREEN, c);
c.gridx = 20;
makeAddButton("Dark Purple", Color.MAGENTA, c);
c.gridx = 30;
makeAddButton("Dark Orange", Color.ORANGE, c);
}
public void updateChooser() {
}
public String getDisplayName() {
return "Panel";
}
public Icon getSmallDisplayIcon() {
return null;
}
public Icon getLargeDisplayIcon() {
return null;
}
private void makeAddButton(String name, Color color, GridBagConstraints c) {
JButton button = new JButton(name);
button.setBackground(color);
button.setBorderPainted(false);
button.setOpaque(true);
button.setAction(setColorAction);
button.setToolTipText(name);
add(button, c);
}
Action setColorAction = new AbstractAction() {
public void actionPerformed(ActionEvent evt) {
JButton button = (JButton) evt.getSource();
getColorSelectionModel().setSelectedColor(button.getBackground());
}
};
}
【问题讨论】：
标签： java swing layout-manager gridbaglayout