JAL-2069 JAL-2808 utility method to build combobox with tooltips

diff --git a/src/jalview/gui/JvSwingUtils.java b/src/jalview/gui/JvSwingUtils.java
index 0a765cb..ef96fa6 100644 (file)
--- a/src/jalview/gui/JvSwingUtils.java
+++ b/src/jalview/gui/JvSwingUtils.java
@@ -24,14 +24,19 @@ import jalview.util.MessageManager;
 
 import java.awt.BorderLayout;
 import java.awt.Color;
+import java.awt.Component;
 import java.awt.Font;
 import java.awt.GridLayout;
 import java.awt.Rectangle;
 import java.awt.event.ActionListener;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.util.List;
 import java.util.Objects;
 
 import javax.swing.AbstractButton;
 import javax.swing.JButton;
+import javax.swing.JComboBox;
 import javax.swing.JComponent;
 import javax.swing.JLabel;
 import javax.swing.JMenu;
@@ -304,4 +309,46 @@ public final class JvSwingUtils
     comp.setFont(JvSwingUtils.getLabelFont());
   }
 
+  /**
+   * A helper method to build a drop-down choice of values, with tooltips for
+   * the entries
+   * 
+   * @param entries
+   * @param tooltips
+   */
+  public static JComboBox<String> buildComboWithTooltips(
+          List<String> entries, List<String> tooltips)
+  {
+    JComboBox<String> combo = new JComboBox<>();
+    final ComboBoxTooltipRenderer renderer = new ComboBoxTooltipRenderer();
+    combo.setRenderer(renderer);
+    for (String attName : entries)
+    {
+      combo.addItem(attName);
+    }
+    renderer.setTooltips(tooltips);
+    final MouseAdapter mouseListener = new MouseAdapter()
+    {
+      @Override
+      public void mouseEntered(MouseEvent e)
+      {
+        int j = combo.getSelectedIndex();
+        if (j > -1)
+        {
+          combo.setToolTipText(tooltips.get(j));
+        }
+      }
+      @Override
+      public void mouseExited(MouseEvent e)
+      {
+        combo.setToolTipText(null);
+      }
+    };
+    for (Component c : combo.getComponents())
+    {
+      c.addMouseListener(mouseListener);
+    }
+    return combo;
+  }
+
 }