添加 JScrollpane 时框布局中未对齐的框

Misaligned box in box layout when adding JScrollpane

我想创建一个简单的 table 具有 JTable 的一些功能,但更容易设置样式,所以我在盒子布局中创建了几个盒子,一个用于 header 和另一个包含单元格。当我将 JScrollPane 添加到单元格的框时,它缩进了 header 框,现在不对齐了。

未对齐的框:

我试过 setAlignmentX 和 ComponentOrientation,但运气不好。有人有什么想法吗?

public class GUIInventory extends JPanel
{
    Box headersBox = Box.createHorizontalBox();
    Box cellsBox = Box.createVerticalBox();
    JScrollPane scrollPane;
    ArrayList<Box> rows = new ArrayList<>();
    ArrayList<JLabel> cells = new ArrayList<>();
    JLabel[] headerLabels = new JLabel[4];
    String[] headerLabelNames = {"Name", "Order Date", "Order Number", "Cost"};

    public GUIInventory()
    {
        this.setBackground(Color.WHITE);
        this.setLayout(new BoxLayout(this, BoxLayout.Y_AXIS));
        this.setAlignmentX(Component.LEFT_ALIGNMENT);

        Border outer = BorderFactory.createMatteBorder(0, 0, 0, 1, Color.LIGHT_GRAY);
        Border inner = BorderFactory.createEmptyBorder(10, 10, 10, 10);

        for(int i = 0; i < this.headerLabels.length; i++)
        {
            this.headerLabels[i] = new JLabel(this.headerLabelNames[i]);
            this.headerLabels[i].setBorder(BorderFactory.createCompoundBorder(outer, inner));
            this.headerLabels[i].setFont(new Font("Arial", Font.BOLD, 16));
            this.headerLabels[i].setMaximumSize(new Dimension(200, (int) this.headerLabels[i].getPreferredSize().getHeight()));
            this.headerLabels[i].setAlignmentX(Component.LEFT_ALIGNMENT);
            this.headersBox.add(this.headerLabels[i]);
        }


        this.headersBox.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createMatteBorder(1, 1, 0, 0, Color.LIGHT_GRAY), BorderFactory.createMatteBorder(0, 0, 2, 0, Color.BLACK)));
        this.headersBox.setAlignmentX(Component.LEFT_ALIGNMENT);
        this.headersBox.setBorder(BorderFactory.createLineBorder(Color.GREEN, 2));

        this.cellsBox.setBorder(BorderFactory.createMatteBorder(1, 1, 0, 0, Color.LIGHT_GRAY));
        this.cellsBox.setAlignmentX(Component.LEFT_ALIGNMENT);

        this.scrollPane = new JScrollPane(this.cellsBox);

        this.add(this.headersBox);
        this.add(this.scrollPane);
    }

I've tried setAlignmentX

这仅与您使用垂直 BoxLayout 添加到面板的组件相关:

this.add(this.headersBox);
this.add(this.scrollPane);

您在 headersBox 上设置了对齐方式,但在 scrollPane 上没有设置。所以你错过了:

this.scrollPane.setAlignmentX(Component.LEFT_ALIGNMENT);

还有

this.setAlignmentX(Component.LEFT_ALIGNMENT);

不需要,因为这是父面板,而不是子组件。

并且,

this.headerLabels[i].setAlignmentX(Component.LEFT_ALIGNMENT);

不需要,因为左对齐与水平布局无关。

并且,

this.cellsBox.setAlignmentX(Component.LEFT_ALIGNMENT);

不需要,因为此组件已添加到滚动窗格