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我有一个JTable. 一列包含 aJPanel其中包含JLabels一些ImageIcons。我创建了一个自定义单元格渲染，除了JLabel. 当我将鼠标悬停在其中任何一个上时，JLabels我需要显示Tooltip那个特定的JLabel. 它没有显示JLabel.

这里是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;
        }
    }
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1 回答 1

12

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

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

然后，您可以从那里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;
}
于 2012-06-01T18:17:57.420 回答