如何使用GridBagLayout将组件放在右下角？ [英] How to put component in bottom-right corner with GridBagLayout?

问题描述

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：

I need to display a single component within a JPanel, and I want to keep that component in bottom right corner at all times. I tried to do it with 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，文本区域位于中心位置：

But the text area is at the center for some reason:

我在这里做错了什么？

推荐答案

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

...if you realy want to use GridBagLayout

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