JTable中JPanel中的工具提示不起作用

Question

我有一个JTable.一列拥有JPanel其中包含了一些JLabels用ImageIcons.我创建了一个自定义单元格渲染,除了工具提示之外,所有工作都很好JLabel.当我将鼠标移到其中任何一个上面时,JLabels我需要展示Tooltip那个特别的东西JLabel.它没有显示出的JLabel.

这是CustomRenderer.

private class CustomRenderer extends
            DefaultTableCellRenderer implements TableCellRenderer {

        @Override
        public Component getTableCellRendererComponent(JTable table,
            Object value, boolean isSelected, boolean hasFocus, int row,
                int column) {   

            if (value != null && value instanceof List) {

                JPanel iconsPanel = new JPanel(new GridBagLayout());
                List<ImageIcon> iconList = (List<ImageIcon>) value;
                int xPos = 0;
                for (ImageIcon icon : iconList) {
                    JLabel iconLabel = new JLabel(icon);
                    iconLabel.setToolTipText(icon.getDescription());
                    GridBagConstraints gbc = new GridBagConstraints();
                    gbc.gridy = 1;
                    gbc.gridx = xPos++;
                    iconsPanel.add(iconLabel, gbc);
                }
                iconsPanel.setBackground(isSelected ? table
                        .getSelectionBackground() : table.getBackground());
                this.setVerticalAlignment(CENTER);
                return iconsPanel;
            }
            return this;
        }
    }

Answer 1

问题是您在CellRenderer返回的组件的子组件上设置工具提示.要执行您想要的操作,您应该考虑覆盖getToolTipText(MouseEvent e)JTable.从事件中,您可以找到鼠标所在的行和列,使用:

java.awt.Point p = e.getPoint();
int rowIndex = rowAtPoint(p);
int colIndex = columnAtPoint(p);

然后,您可以重新准备单元格渲染器,找到位于鼠标位置的组件,并最终检索其工具提示.

以下是如何覆盖JTable getToolTipText的片段:

@Override
public String getToolTipText(MouseEvent event) {
    String tip = null;
    Point p = event.getPoint();

    // Locate the renderer under the event location
    int hitColumnIndex = columnAtPoint(p);
    int hitRowIndex = rowAtPoint(p);

    if (hitColumnIndex != -1 && hitRowIndex != -1) {
        TableCellRenderer renderer = getCellRenderer(hitRowIndex, hitColumnIndex);
        Component component = prepareRenderer(renderer, hitRowIndex, hitColumnIndex);
        Rectangle cellRect = getCellRect(hitRowIndex, hitColumnIndex, false);
        component.setBounds(cellRect);
        component.validate();
        component.doLayout();
        p.translate(-cellRect.x, -cellRect.y);
        Component comp = component.getComponentAt(p);
        if (comp instanceof JComponent) {
            return ((JComponent) comp).getToolTipText();
        }
    }

    // No tip from the renderer get our own tip
    if (tip == null) {
        tip = getToolTipText();
    }

    return tip;
}