我需要在JPanel
中显示单个组件,并且我希望始终将该组件保留在右下角。我尝试使用GridBagLayout:
val infoArea = new TextArea {
text = "Hello!"
border = Swing.EmptyBorder(30)
background = Color.RED
editable = false
}
val p = new JPanel
p.setLayout(new GridBagLayout)
val c = new GridBagConstraints
c.gridx = 0
c.gridy = 0
c.anchor = GridBagConstraints.LAST_LINE_END
p.add(infoArea.peer,c)
val f = new JFrame
f.setContentPane(p)
f.setVisible(true)
但由于某种原因,文本区域处于中心位置:
我在这里做错了什么?
答案 0 :(得分:8)
例如:
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import javax.swing.*;
public class LayoutDemo {
private static void createAndShowGui() {
JLabel label = new JLabel("Hello");
label.setOpaque(true);
label.setBackground(Color.red);
JPanel bottomPanel = new JPanel(new BorderLayout());
bottomPanel.add(label, BorderLayout.LINE_END);
JPanel mainPanel = new JPanel(new BorderLayout());
mainPanel.add(bottomPanel, BorderLayout.PAGE_END);
mainPanel.setPreferredSize(new Dimension(400, 400));
JFrame frame = new JFrame("LayoutDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
答案 1 :(得分:5)
final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
frame.setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.BOTH;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
frame.add(Box.createGlue(), gbc);
final JTextArea textArea = new JTextArea("SE");
textArea.setPreferredSize(new Dimension(50, 50));
textArea.setOpaque(true);
textArea.setBackground(Color.RED);
gbc = new GridBagConstraints();
gbc.gridx = 1;
gbc.gridy = 1;
gbc.fill = GridBagConstraints.NONE;
gbc.weightx = 0.0;
gbc.weighty = 0.0;
frame.add(textArea, gbc);
frame.setSize(640, 480);
frame.setVisible(true);
...如果你真的想使用GridBagLayout
答案 2 :(得分:0)
您必须在Lombok Plugin
和Box.createGlue()
上放置一个虚拟组件(使用gridx = 0
来创建虚拟组件),并将要放置在{{1 }},gridy = 0
。like this