通过 Java 中的按钮刷新自定义容器

Question

早上好，

我有一个继承自 java.awt.Container 的类。他的范围是包装一个文件列表，将它们垂直显示为“文件名标签+删除按钮”列表。

文件显示正确，每次添加新文件时，都会正确刷新。

组件类的代码：

public class AttachmentsList extends Container {
private List<File>  attachments = null;

public AttachmentsList(List<File> attachments)
{
    super();
    this.attachments = attachments;
    buildListAttachments();
}

@Override
public void repaint()
{
    buildListAttachments();
    super.repaint();
}

protected void buildListAttachments()
{
    int yTraslation = 0;

    for (File attachment : this.attachments)
    {
        Label fileName = new Label(attachment.getName());
        fileName.setBounds(10, 10 + yTraslation, 70, 20);

        //invisible, just contain the absolute path...
        final Label path = new Label(attachment.getAbsolutePath());
        fileName.setBounds(10, 10 + yTraslation, 70, 20);

        Button deleteFile = new Button("x");
        deleteFile.setBounds(90, 10 + yTraslation, 20, 20);

        deleteFile.addActionListener(new ActionListener()
        {
            @Override
            public void actionPerformed(ActionEvent e)
            {
                File fileToRemove = new File(path.getText());
                attachments.remove(fileToRemove);
                System.out.println(attachments.size());
                repaint();//<---- It doesn't refresh the main UI.
            }
        });

        add(fileName);
        add(deleteFile);

        yTraslation += 20;
    }
}

按钮的作用域是从文件列表中删除由他自己的绝对路径标识的特定文件。它可以工作，但我不知道如何通过主界面刷新他的 UI。

上面的代码在主 UI 类中被调用：

...
final List<File> filesAttached = new LinkedList<File>();
...
final AttachmentsList attachmentsList = new AttachmentsList(fileAttached);
attachmentsList.setBounds(10, 80, 120, 200);
...
//inside ActionListener
...
//pathChooser is a JFileChooser object
fileAttached.add(pathChooser.getSelectedFile());
//every time that one file is added i have to refresh that component. It refreshes!
attachmentsList.repaint();
...

每次按下“deleteFile”按钮时，我都必须刷新该容器。我该怎么做？

谢谢你，问候

安德烈亚

Answer 1

终于根据安德鲁的建议找到了解决办法。

这是我的课：

public class AttachmentsList extends JPanel
{
private List<File>          attachments = null;

private JTable              jt          = null;
private DefaultTableModel   model       = null;
private JScrollPane         scroller    = null;

public AttachmentsList(List<File> attachments)
{
    super();
    this.attachments = attachments;
    setLayout(new GridLayout());

    Vector<Vector> rowData = new Vector<Vector>();

    for (File iterable_element : this.attachments)
    {
        Vector<Object> row = new Vector<Object>();
        row.addElement(iterable_element.getName());
        row.addElement(new JCheckBox());

        rowData.add(row);
    }

    Vector<String> columnNames = new Vector<String>();
    columnNames.add("File");
    columnNames.add("Selected");

    this.jt = new JTable(rowData, columnNames);
    this.jt.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);

    this.model = (DefaultTableModel) this.jt.getModel();

    final TableColumnModel columnModel = this.jt.getColumnModel();

    columnModel.getColumn(0).setPreferredWidth(100);
    columnModel.getColumn(1).setPreferredWidth(60);

    this.scroller = new JScrollPane(this.jt);

    add(this.scroller);
}

@Override
public void repaint()
{
    buildTable();
}

protected void buildTable()
{
    if (this.attachments != null)
    {
        Vector<Vector> rowData = new Vector<Vector>();

        for (File currentFile : this.attachments)
        {
            Vector<Object> row = new Vector<Object>();
            row.addElement(currentFile.getName());
            row.addElement(false);

            rowData.add(row);
        }

        this.model.addRow(rowData);
    }
}

public void addFile(File file)
{
    Vector<Object> row = new Vector<Object>();
    row.addElement(file.getName());
    row.addElement(false);

    this.model.addRow(row);
}

public List<File> getAttachments()
{
    return attachments;
}

public void setAttachments(List<File> attachments)
{
    this.attachments = attachments;
}

}

这是一个有效的原始组件，显示存储在 List 中的文件。