java - 跨越 JTable 特定列的所有行(以呈现 JTextPane)

Question

我想构建一个标准的 JTable，但所有行都分布在一个特定的列上。因此该列必须仅包含一个以 JTextPane 作为其渲染器的单元格。您知道任何简单的方法吗？

注意:不需要第三方软件。

谢谢。

Answer 1

由某种覆盖的@MvG 想法触发，这里是使用 JLayer 的概念验证(添加到 jdk7 的核心，对于早期版本，使用非常相似的 JXLayer in SwingLabs)

基本成分:

• 在其 glassPane 中管理文本区域的 LayerUI
• 自定义 layoutManager，它在列上调整/定位 textArea
• 强制重新布局 glassPane 的一些听众

至少让它发挥作用出人意料地简单。不过，也有一些粗糙的边缘:

• 与往常一样，在表格中导航:当表格具有焦点时，其单元格选择将移动到 textArea 下方。可能需要自定义 selectionModel
• 移动列时，该列下的表格行可见
• ??可能又是一群魔鬼，毕竟我们混淆了用户界面:-)

部分代码:

public static class RowSpanUI extends LayerUI<JTable> {
    public static String COLUMN_TO_SPAN_KEY = "Table.columnToSpan";
    private JLayer layer;
    private JTextArea area;

    @Override
    public void installUI(JComponent c) {
        super.installUI(c);
        this.layer = (JLayer) c;
        installTextArea();
        installListeners();
    }


    @Override
    public void doLayout(JLayer<? extends JTable> l) {
        super.doLayout(l);
        l.getGlassPane().doLayout();
    }

     private void installTextArea() {
        area = new JTextArea(10, 20);
        layer.getGlassPane().setBorder(BorderFactory.createLineBorder(Color.RED));
        layer.getGlassPane().setLayout(new ColumnLayoutManager(this));
        layer.getGlassPane().add(area);
        layer.getGlassPane().setVisible(true);
    }

    public JTable getView() {
        return (JTable) layer.getView();
    }

    public int getViewColumnToSpan() {
        Object clientProperty = getView().getClientProperty(COLUMN_TO_SPAN_KEY);
        if (clientProperty instanceof Integer) {
            return getView().convertColumnIndexToView((int) clientProperty);
        }   
        return -1;
    }

    /**
     * Install listeners to manually trigger a layout of the glassPane.
     * This is incomplete, just the minimum for demonstration!
     */
    protected void installListeners() {
        ComponentListener compL = new ComponentListener() {

            @Override
            public void componentShown(ComponentEvent e) {
                doLayout(layer);
            }

            @Override
            public void componentResized(ComponentEvent e) {
                doLayout(layer);
            }

            @Override
            public void componentMoved(ComponentEvent e) {
                doLayout(layer);
            }

            @Override
            public void componentHidden(ComponentEvent e) {
                // TODO Auto-generated method stub

            }
        };
        layer.addComponentListener(compL);

        TableColumnModelListener columnL = new TableColumnModelListener() {

            @Override
            public void columnRemoved(TableColumnModelEvent e) {
                doLayout(layer);
            }

            @Override
            public void columnMoved(TableColumnModelEvent e) {
                doLayout(layer);
            }

            @Override
            public void columnMarginChanged(ChangeEvent e) {
                doLayout(layer);
            }

            @Override
            public void columnAdded(TableColumnModelEvent e) {
                doLayout(layer);
            }

            @Override
            public void columnSelectionChanged(ListSelectionEvent e) {
            }

        };
        getView().getColumnModel().addColumnModelListener(columnL);
    }

}

public static class ColumnLayoutManager implements LayoutManager {

    private RowSpanUI ui;

    public ColumnLayoutManager(RowSpanUI ui) {
        this.ui = ui;
    }

    @Override
    public void layoutContainer(Container parent) {
        Component child = parent.getComponent(0);
        child.setBounds(getColumnBounds());
    }

    @Override
    public Dimension preferredLayoutSize(Container parent) {
        return ui.getView().getSize();
    }

    protected Rectangle getColumnBounds() {
        int viewColumn = ui.getViewColumnToSpan();
        if (viewColumn < 0) {
            return new Rectangle();
        }
        Rectangle r = ui.getView().getCellRect(0, viewColumn, false);
        r.height = ui.getView().getHeight();
        return r;
    }

    @Override
    public Dimension minimumLayoutSize(Container parent) {
        return preferredLayoutSize(parent);
    }
    @Override
    public void addLayoutComponent(String name, Component comp) {
    }

    @Override
    public void removeLayoutComponent(Component comp) {
    }
}

// usage
JTable table = new JTable(myModel);
table.putClientProperty(RowSpanUI.COLUMN_TO_SPAN_KEY, 2);
JLayer layer = new JLayer(table, new RowSpanUI());