java - 将 JList 项目 (JPanel) 左对齐

Question

我在弄清楚如何将 JList 中的 JPanel 与左侧对齐时遇到问题。

我正在使用自定义 ListCellRenderer，因此 JPanel 会进行渲染。

public class FileTab extends JPanel implements ListCellRenderer<FileProperties> {

    public FileTab(int w, int h) {
        setSize(w, h);
    }

    private void initComponents(FileProperties prop, boolean selected) {
        removeAll();
        JCheckBox checkBoxSelection = new JCheckBox();
        checkBoxSelection.setBounds(10, 10, 10, 10);
        add(checkBoxSelection);

        checkBoxSelection.setSelected(selected);

        System.out.println("Draw: " + prop.getFileName());
        JLabel labelFileName = new JLabel(prop.getFileName());
        labelFileName.setBounds(5, 70, getWidth() - 85, 20);
        labelFileName.setFont(new Font("Consolas", Font.ITALIC, 20));
        add(labelFileName);
    }

    @Override
    public Component getListCellRendererComponent(JList<? extends FileProperties> list, FileProperties prop, int index,
        boolean isSelected,
        boolean cellHasFocus) {
        initComponents(prop, isSelected);

        return this;
    }
}

这就是我创建列表的方式:

JScrollPane scroll = new JScrollPane();
scroll.setBounds(5, 5, getWidth() - 10, getHeight() - 110);
list = new DefaultListModel<>();
fileList = new JList<>(list);
fileList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
fileList.setCellRenderer(new FileTab(getWidth() - 30, 30));
scroll.setViewportView(fileList);
add(scroll);

这会导致 JPanel 居中对齐，而不是左侧对齐。

以及列表的更新:

list.clear();
for (FileProperties props : files) {
    list.addElement(props);
}
fileList.setCellRenderer(new FileTab(getWidth() - 30, 30));

Answer 1

默认情况下，JPanel 使用FlowLayout，默认情况下是中心对齐。更改 JPanel 以使用右对齐的FlowLayout:

JPanel panel = new JPanel( new FlowLayout(...) ); // Read FlowLayout API for proper parameter