e967. listening for clicks on a column header in a jtable component.txt

来自「这里面包含了一百多个JAVA源文件」· 文本 代码 · 共 41 行

int rows = 10;
    int cols = 5;
    JTable table = new JTable(rows, cols);
    JTableHeader header = table.getTableHeader();
    
    header.addMouseListener(new ColumnHeaderListener());
    
    public class ColumnHeaderListener extends MouseAdapter {
        public void mouseClicked(MouseEvent evt) {
            JTable table = ((JTableHeader)evt.getSource()).getTable();
            TableColumnModel colModel = table.getColumnModel();
    
            // The index of the column whose header was clicked
            int vColIndex = colModel.getColumnIndexAtX(evt.getX());
            int mColIndex = table.convertColumnIndexToModel(vColIndex);
    
            // Return if not clicked on any column header
            if (vColIndex == -1) {
                return;
            }
    
            // Determine if mouse was clicked between column heads
            Rectangle headerRect = table.getTableHeader().getHeaderRect(vColIndex);
            if (vColIndex == 0) {
                headerRect.width -= 3;    // Hard-coded constant
            } else {
                headerRect.grow(-3, 0);   // Hard-coded constant
            }
            if (!headerRect.contains(evt.getX(), evt.getY())) {
                // Mouse was clicked between column heads
                // vColIndex is the column head closest to the click
    
                // vLeftColIndex is the column head to the left of the click
                int vLeftColIndex = vColIndex;
                if (evt.getX() < headerRect.x) {
                    vLeftColIndex--;
                }
            }
        }
    }