如何从Tab键导航中排除列？

Question

通过按Tab键,焦点移动到下一个单元格.我想更改此行为,以便从标签键导航中排除某些列.假设一个表由5列组成,那么只应考虑列1和3进行导航.从我读过的内容FocusTraversalPolicy就是用于此目的.但是,实现此行为似乎相当复杂,因为没有提供列和行指示.那么我该如何返回正确的组件？

public class Table extends JTable{
int columnCount = 5;
int[] tab = { 1, 3 };  
    public Table(){
        ...
        this.setFocusTraversalPolicy(new FocusTraversalPolicy() {

        @Override
        public Component getLastComponent(Container arg0) {
             return null;
        }

        @Override
        public Component getFirstComponent(Container arg0) {
            return null;
        }

        @Override
        public Component getDefaultComponent(Container arg0) {
            return null;
        }

        @Override
        public Component getComponentBefore(Container arg0, Component arg1) {
            return null;
        }

        @Override
        public Component getComponentAfter(Container arg0, Component arg1) {
            return null;
        }
    }); 
    } 
}

Answer 1

从我所读到的,FocusTraversalPolicy用于此目的

表列不是实际组件,因此一旦表获得焦点,FocusTraversalPolicy就没有意义.JTable提供从一个单元移动到另一个单元的动作.

您可以使用表Tabbing中的概念.例如:

public class SkipColumnAction extends WrappedAction
{
    private JTable table;
    private Set columnsToSkip;

    /*
     *  Specify the component and KeyStroke for the Action we want to wrap
     */
    public SkipColumnAction(JTable table, KeyStroke keyStroke, Set columnsToSkip)
    {
        super(table, keyStroke);
        this.table = table;
        this.columnsToSkip = columnsToSkip;
    }

    /*
     *  Provide the custom behaviour of the Action
     */
    public void actionPerformed(ActionEvent e)
    {
        TableColumnModel tcm = table.getColumnModel();
        String header;

        do
        {
            invokeOriginalAction( e );

            int column = table.getSelectedColumn();
            header = tcm.getColumn( column ).getHeaderValue().toString();
        }
        while (columnsToSkip.contains( header ));
    }
}

要使用这个课你会做:

Set<String> columnsToSkip = new HashSet<String>();
columnsToSkip.add("Column Name ?");
columnsToSkip.add("Column Name ?");
new SkipColumnAction(table, KeyStroke.getKeyStroke("TAB"), columnsToSkip);
new SkipColumnAction(table, KeyStroke.getKeyStroke("shift TAB"), columnsToSkip);

关键是你必须用你自己的一个替换表的默认Tab键Action.