在保持JTable默认渲染器的同时对齐JTable单元格中的文本？ [英] Align text in a JTable cell while maintaining JTable default renderer?

问题描述

由于这段代码，我有一个JTable可以做出可爱的颜色变换：

I have a JTable that does lovely alternations in coloration thanks to this code:

table.setDefaultRenderer(Object.class, new BorderRenderer(new ColorRenderer(table
                .getDefaultRenderer(Object.class), colorProvider)));

（这里colorProvider包含将每隔一行变为浅灰色的代码。）我有一列我希望将文本对齐到中心。如果我只是在中心水平对齐的那一列上设置一个DefaultCellRenderer，它会覆盖表的默认渲染器，我会丢失可爱的条纹。

(Here the "colorProvider" contains code that turns every other row light grey.) I have one column in which I would like to align text to center. If I simply set a DefaultCellRenderer on that column with center horizontal alignment, it overrides the table's default renderer and I lose my lovely stripes.

我可以保留条纹并仍然更改列的对齐？

Can I keep the stripes and still change the alignment of a column?

为了使事情更复杂，我在超类中有上面的代码。我的子类知道他们想要更改对齐的列。

To further complicate things, I have the above code in a super class. It is my sub classes that know what column(s) they would like to change the alignment on.

推荐答案

非常感谢afk和camickr让我最终决定写一个TableCellRendererWrapper：

Thanks both to afk and camickr who led me to my final decision to write a TableCellRendererWrapper:

public class ColumnAlignmentRenderer implements TableCellRenderer {

    private TableCellRenderer mWrappedRenderer;
    private int mDefaultAlignment = SwingConstants.LEFT;
    private Map<Integer, Integer> mSpecialColumnAlignmentMap = new Hashtable<Integer, Integer>();

    public ColumnAlignmentRenderer(TableCellRenderer pWrappedRenderer) {
        mWrappedRenderer = pWrappedRenderer;
    }

    public Component getTableCellRendererComponent(JTable pTable, Object pValue, boolean pIsSelected,
            boolean pHasFocus, int pRow, int pColumn) {

        // Use the wrapped renderer
        Component renderedComponent = mWrappedRenderer.getTableCellRendererComponent(pTable, pValue, pIsSelected, pHasFocus,
                pRow, pColumn);

        // Set the alignment
        Integer alignment = mSpecialColumnAlignmentMap.get(pColumn);
        if (alignment != null) {
            ((JLabel)renderedComponent).setHorizontalAlignment(alignment);
        } else {
            ((JLabel)renderedComponent).setHorizontalAlignment(mDefaultAlignment);
        }

        return renderedComponent;
    }

    public void setSpecialColumnAlignment(Integer pColumn, Integer pAlignment) {
        mSpecialColumnAlignmentMap.put(pColumn, pAlignment);
    }

    public void setDefaultAlignment(int pAlignment) {
        mDefaultAlignment = pAlignment;
    }
}

这不是完美的，但它可以完成工作我。要使用它我执行此操作：

It's not perfect, but it gets the job done for me. To use it I do this:

        // Center alignment for "selected" column
        ColumnAlignmentRenderer cellRenderer = new ColumnAlignmentRenderer(getTable().getDefaultRenderer(Object.class));
        cellRenderer.setSpecialColumnAlignment(MyTableModel.COL_TO_CENTER, SwingConstants.CENTER);
        getTable().setDefaultRenderer(Object.class, cellRenderer);

        // Center alignmet for "selected" column header
        ColumnAlignmentRenderer headerRenderer = new ColumnAlignmentRenderer(getTable().getTableHeader().getDefaultRenderer());
        headerRenderer.setSpecialColumnAlignment(MyTableModel.COL_TO_CENTER, SwingConstants.CENTER);
        getTable().getTableHeader().setDefaultRenderer(headerRenderer);

这篇关于在保持JTable默认渲染器的同时对齐JTable单元格中的文本？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！