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GridBagLayout问题

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我正在尝试使用GridBagLayout . 我需要一个垂直和水平居中的JLabel - 这很容易，我甚至不需要创建任何GridBagConstraints . 我还想把JButton放在右下角，当我尝试这样做时，我的中心面板向左移动或按钮向上移动 .

EXPECTING     GETTING THIS  OR THIS
+-----------+ +-----------+ +-----------+
|           | |           | |           |
|           | |           | |           |
|           | |           | |           |
|   +---+   | | +---+     | | +---+     |
|   |   |   | | |   |     | | |   |     |
|   +---+   | | +---+     | | +---++---+|
|           | |           | |      |   ||
|           | |           | |      +---+|
|       +---+ |       +---+ |           |
|       |   | |       |   | |           |
+-------+---+ +-------+---+ +-----------+

bigPanel = new JPanel();
bigPanel.setPreferredSize(new Dimension(320, 640));
bigPanel.setLayout(new GridBagLayout());

label = new JLabel();
label.setPreferredSize(new Dimension(100,95));

button = new JButton();
button.setPreferredSize(new Dimension(100,25));

GridBagConstraints c = new GridBagConstraints();

c.anchor = GridBagConstraints.CENTER;
bigPanel.add(label, c);

c.anchor = GridBagConstraints.LAST_LINE_END;
bigPanel.add(button, c);

我也试图使用这里描述的其他约束http://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html，但每次出错 .

java swing layout-manager gridbaglayout

1 回答

  • 5

    anchor 如果组件未填充单元格，则在其单元格内设置组件位置 .

    您尚未定义布局的网格 . 默认行为是从左到右添加组件 .

    以下是使用 GridBagLayout 实现所需内容的示例 . 标签和按钮放在同一个单元格中，填充面板 .

    public class Test extends JPanel {
    public Test() {
        super();
        GridBagLayout gridBagLayout = new GridBagLayout();
        gridBagLayout.columnWeights = new double[] { 1.0 }; // expands the  1rst cell of the layout on the vertical axis
        gridBagLayout.rowWeights = new double[] { 1.0 }; // expands the 1rst cell of the layout on the horizontal axis
        setLayout(gridBagLayout);

        JLabel label = new JLabel("test");          
        label.setOpaque(true);
        label.setBackground(Color.RED);
        label.setPreferredSize(new Dimension(100, 95));
        GridBagConstraints gbc_label = new GridBagConstraints();
        gbc_label.gridx = 0; // set label cell (0,0)
        gbc_label.gridy = 0;
        gbc_label.insets = new Insets(0, 0, 5, 5);

        add(label, gbc_label);

        JButton button = new JButton("button");
        GridBagConstraints gbc_button = new GridBagConstraints();
        gbc_button.gridx = 0; // set buttoncell (0,0)
        gbc_button.gridy = 0;
        gbc_button.anchor = GridBagConstraints.SOUTHEAST;

        add(button, gbc_button);
        button.setPreferredSize(new Dimension(100, 25));
    }
}
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