当按下 Enter 键时，如何确定选择了 JTable 的哪一部分？

Question

我有一个JTable。我想知道当用户按 Enter 时选择了哪行和哪列。我怎样才能得到这些信息？

Answer 1

实现 TableModelListener。 tableChanged() 中的 TableModelEvent方法将告诉您更改的来源是哪行和哪列。

Answer 2

所有 Swing 组件都使用操作来处理击键。 Enter 键的默认操作是将单元格选择向下移动一行。如果您想更改此行为，则需要将默认操作替换为自定义操作。

查看按键绑定，了解如何替换操作的简单说明。

Answer 3

将其添加到您的表中。对于 rowClicked 和 colClicked 有两个 int 全局变量。应该可以了

        table.addMouseListener(new MouseAdapter(){
            public void mouseReleased(MouseEvent e)
            {
                rowClicked = rowAtPoint(e.getPoint());
                colClicked = columnAtPoint(e.getPoint());
            }

            public void mouseClicked(MouseEvent e)
            {
                rowClicked = rowAtPoint(e.getPoint());
                colClicked = columnAtPoint(e.getPoint());
            }
        });

如果您谈论使用键盘来注册事件，您必须找到选定的单元格，然后向其添加一个 KeyListener 。您可以使用以下代码来查找所选单元格。请注意，这实际上取决于单元选择模式。

public void getSelectedCells()
    {
        if (getColumnSelectionAllowed() && ! getRowSelectionAllowed())
        {
            // Column selection is enabled
            // Get the indices of the selected columns
            int[] vColIndices = getSelectedColumns();
        }
        else if (!getColumnSelectionAllowed() && getRowSelectionAllowed())
        {
            // Row selection is enabled
            // Get the indices of the selected rows
            int[] rowIndices = getSelectedRows();
        }
        else if (getCellSelectionEnabled())
        {
            // Individual cell selection is enabled

            // In SINGLE_SELECTION mode, the selected cell can be retrieved using
            setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
            int rowIndex = getSelectedRow();
            int colIndex = getSelectedColumn();

            // In the other modes, the set of selected cells can be retrieved using
            setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
            setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);

            // Get the min and max ranges of selected cells
            int rowIndexStart = getSelectedRow();
            int rowIndexEnd = getSelectionModel().getMaxSelectionIndex();
            int colIndexStart = getSelectedColumn();
            int colIndexEnd = getColumnModel().getSelectionModel().getMaxSelectionIndex();

            // Check each cell in the range
            for (int r = rowIndexStart; r < = rowIndexEnd; r++)
            {
                for (int c = colIndexStart; c < = colIndexEnd; c++)
                {
                    if (isCellSelected(r, c))
                    {
                        // cell is selected
                    }
                }
            }
        }
    }