Question

请有人能够对我的代码提供一些了解。我想让天平选项卡上的按钮与左上角对齐。我尝试过不同的布局管理器，但似乎都会导致按钮位于中心的相同或类似结果

public class DefaultView extends JFrame {

    public DefaultView() {    
        JButton SendBalInc = new JButton();
        SendBalInc.setText("Balance");    
        GridBagConstraints c = new GridBagConstraints();
        GridBagLayout gridbag = new GridBagLayout();
        c.fill = GridBagConstraints.BOTH;
        // Bal.fill = GridBagConstraints.NONE;    
        JPanel window = new JPanel();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(800, 600);
        // this.setUndecorated(true);    
        window.setBackground(Color.WHITE);    
        JTabbedPane tabbedPane = new JTabbedPane();
        tabbedPane.setBackground(Color.WHITE);    
        JComponent panel1 = makeTextPanel("Panel #1");
        tabbedPane.addTab("PIN ", panel1);    
        JPanel panel2 = new JPanel();
        Box box = Box.createHorizontalBox();
        box.add(Box.createHorizontalGlue());    
        box.add(SendBalInc);    
        panel2.setBackground(Color.WHITE);    
        panel2.add(box);    
        tabbedPane.addTab("Balance", panel2);    
        JComponent panel3 = makeTextPanel("Panel #3");
        tabbedPane.addTab("Dep", panel3);    
        JComponent panel4 = makeTextPanel("Panel #4");
        tabbedPane.addTab("Bill", panel4);    
        window.setLayout(new GridLayout(1, 2));
        window.add(tabbedPane);    
        this.add(window);    
    }

    protected JComponent makeTextPanel(String text) {
        JPanel panel = new JPanel();
        panel.setBackground(Color.WHITE);
        return panel;
    }    
}

Answer 1

我更喜欢GridBagLayout：

    final JPanel panel2 = new JPanel();
    panel2.setLayout(new GridBagLayout());
    panel2.setBackground(Color.WHITE);

    final GridBagConstraints cons = new GridBagConstraints();
    cons.weightx = 1D;
    cons.weighty = 1D;
    cons.anchor = GridBagConstraints.NORTHWEST;
    panel2.add(box, cons);

    tabbedPane.addTab("Balance", panel2);

注意：不需要框

Answer 2

您可以简单地使用BoxLayout

JPanel panel2 = new JPanel();
panel2.setLayout(new BoxLayout(panel2, BoxLayout.Y_AXIS));
panel2.setBackground(Color.WHITE);
panel2.add(SendBalInc);

但我认为Betlista对GridBag的回答可能更合适，因为您有更多选择可以在未来进一步调整布局。

Answer 3

创建Box并将其直接添加到JTabbedPane，而不是先将其放在面板中。并使该框成为一个垂直框，以便您可以通过在每个子项上设置setAlignmentX来控制其子项的对齐。

    Box box = Box.createVerticalBox();
    box.add(SendBalInc);
    tabbedPane.addTab("Balance", box);

Answer 4

您可以添加以下内容以将按钮对齐到左侧：

panel2.setLayout(new FlowLayout(FlowLayout.LEFT));

您可以在文档{{3p>中找到更多信息

Java按钮布局右对齐

4 个答案: