Java - 如何防止 BorderLayout EAST 拥抱屏幕的一侧？
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Java - How do I prevent BorderLayout EAST from hugging the side of the screen?
提问by ShrimpCrackers
If I add components like JButtons on the East or West side, how do I prevent it from hugging the side of the screen? I want some space between the JButtons and the edge of the screen.
如果我JButton在东侧或西侧添加s 之类的组件，如何防止它抱住屏幕的一侧？我想要在JButtons 和屏幕边缘之间有一些空间。
采纳答案by SyntaxT3rr0r
call setBorderon your JButton like this:
setBorder像这样调用你的 JButton：
setBorder( new EmptyBorder( 3, 3, 3, 3 ) )
From the JavaDoc, an EmptyBorder is a "transparent border which takes up space but does no drawing". In my example it shall take 3 pixels respectively top, left, bottom and right.
在 JavaDoc 中，EmptyBorder 是“占用空间但不绘制的透明边框”。在我的示例中，它将分别占用 3 个像素的顶部、左侧、底部和右侧。
Complete code whose purpose is only to show how to use EmptyBorder:
完整代码，其目的仅在于展示如何使用 EmptyBorder：
import java.awt.BorderLayout;
import java.awt.Container;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.border.EmptyBorder;
public class ALineBorder {
public static void main(String args[]) {
JFrame frame = new JFrame("Line Borders");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton button1 = new JButton("Button1");
button1.setBorder( new EmptyBorder( 8, 8, 8, 8 ) );
JButton button2 = new JButton("Button2");
JButton button3 = new JButton("Button3");
button3.setBorder( new EmptyBorder( 16, 16, 16, 16 ) );
Container contentPane = frame.getContentPane();
contentPane.add(button1, BorderLayout.WEST);
contentPane.add(button2, BorderLayout.CENTER);
contentPane.add(button3, BorderLayout.EAST);
frame.pack();
frame.setSize(300, frame.getHeight());
frame.setVisible(true);
}
}
回答by finnw
Most likely you have (or soon will have) more than one button in the container, and want to align them horizontally. So consider putting the buttons within in a nested JPanelwith a GridBagLayout:
很可能您在容器中拥有（或很快将拥有）多个按钮，并希望将它们水平对齐。所以考虑将按钮内嵌套JPanel有GridBagLayout：
class ButtonPanel extends JPanel {
ButtonPanel() {
setLayout(new GridBagLayout());
}
@Override
public Component add(Component button) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridy = nextGridY++;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.insets = new Insets(3, 3, 3, 3);
super.add(button, gbc);
return button;
}
int nextGridY;
}
Then add this panel to the parent frame or panel (with a BorderLayout.)
然后将此面板添加到父框架或面板（带有BorderLayout.）
回答by Thorbj?rn Ravn Andersen
BorderLayout goes as the name says to the border. You can however nest things inside, so you could insert a JPanel with a border and then put your button in that.
BorderLayout 顾名思义就是边框。但是，您可以将内容嵌套在里面，因此您可以插入一个带边框的 JPanel，然后将您的按钮放入其中。
You may also want to experiment with the GUI designer in Netbeans. It is really quite nice, and give a lot of help to things you usually want to do (like have a margin to the border, etc).
您可能还想在 Netbeans 中试验 GUI 设计器。它真的非常好，并且为您通常想做的事情提供了很多帮助（例如边界有余量等）。
