Get tooltip from JComboBox Renderer

问题

I have a ComboBox renderer that extend JPanel and has two labels. In here i need to show tool-tip when mouse goes to iconLabel only. If mouse is in labelItem tool-tip should not show.

    import java.awt.Color;
    import java.awt.Component;
    import java.awt.Dimension;
    import java.awt.GridBagConstraints;
    import java.awt.GridBagLayout;
    import java.awt.Insets;



    import javax.swing.JLabel;
    import javax.swing.JList;
    import javax.swing.JPanel;
    import javax.swing.ListCellRenderer;
    import javax.swing.plaf.metal.MetalIconFactory;

    public class MyItemRenderer extends JPanel implements ListCellRenderer
    {
      private JLabel labelItem = new JLabel();
      private JLabel iconLabel = new JLabel();

      public MyItemRenderer() {
          setLayout(new GridBagLayout());
          GridBagConstraints constraints = new GridBagConstraints();
          constraints.fill = GridBagConstraints.HORIZONTAL;
          constraints.weightx = 1.0;
          constraints.insets = new Insets(2, 2, 2, 0);

          labelItem.setOpaque(true);
          labelItem.setHorizontalAlignment(JLabel.LEFT);

          iconLabel.setOpaque(true);
          iconLabel.setHorizontalAlignment(JLabel.RIGHT);
          iconLabel.setPreferredSize(new Dimension(14, 16));
          iconLabel.setMaximumSize(new Dimension(14, 16));


          add(labelItem, constraints);

          GridBagConstraints constraints1 = new GridBagConstraints();
          constraints1.weightx = 0;
          constraints1.insets = new Insets(0, 0, 0, 2);

          add(iconLabel, constraints1);

          setBackground(Color.LIGHT_GRAY);

      }

      @Override
      public Component getListCellRendererComponent(JList list, Object value,
              int index, boolean isSelected, boolean cellHasFocus) {
          String item = (String) value;

          labelItem.setText(item);

          // set icon
          iconLabel.setIcon(MetalIconFactory.getFileChooserDetailViewIcon());

          if (isSelected) {
              labelItem.setBackground(Color.BLUE);
              labelItem.setForeground(Color.YELLOW);
              iconLabel.setBackground(Color.BLUE);
              iconLabel.setForeground(Color.YELLOW);
          } else {
              labelItem.setForeground(Color.BLACK);
              labelItem.setBackground(Color.LIGHT_GRAY);
              iconLabel.setForeground(Color.BLACK);
              iconLabel.setBackground(Color.LIGHT_GRAY);
          }

          return this;
      }
  }

My tool-tip only need come when mouse over the icon area.That mean user need to get tool-tip only they want.Please help.

回答1:

Override the getToolTipText(MouseEvent event) method of the MyItemRenderer, translate the MouseEvent into the coordinate space of the iconLabel (or what ever component you want). If the MouseEvent falls within the bounds of the component, then return a different result

Something like...

    @Override
    public String getToolTipText(MouseEvent event) {
        String tooltip = super.getToolTipText(event);
        Point p = SwingUtilities.convertPoint(this, event.getPoint(), iconLabel);
        if (iconLabel.contains(p)) {
            tooltip = "I'm a banana";
        }
        return tooltip;
    }

来源：https://stackoverflow.com/questions/31130938/get-tooltip-from-jcombobox-renderer

标签

java

swing

tooltip

jcombobox