JAL-2491 First port to applet

[jalview.git] / src / jalview / appletgui / IdCanvas.java

diff --git a/src/jalview/appletgui/IdCanvas.java b/src/jalview/appletgui/IdCanvas.java
index abcbd70..cad5de5 100755 (executable)
--- a/src/jalview/appletgui/IdCanvas.java
+++ b/src/jalview/appletgui/IdCanvas.java
@@ -21,6 +21,7 @@
 package jalview.appletgui;
 
 import jalview.datamodel.SequenceI;
+import jalview.viewmodel.ViewportListenerI;
 import jalview.viewmodel.ViewportRanges;
 
 import java.awt.Color;
@@ -28,9 +29,10 @@ import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Image;
 import java.awt.Panel;
+import java.beans.PropertyChangeEvent;
 import java.util.List;
 
-public class IdCanvas extends Panel
+public class IdCanvas extends Panel implements ViewportListenerI
 {
   protected AlignViewport av;
 
@@ -55,6 +57,7 @@ public class IdCanvas extends Panel
     setLayout(null);
     this.av = av;
     PaintRefresher.Register(this, av.getSequenceSetId());
+    av.getRanges().addPropertyChangeListener(this);
   }
 
   public void drawIdString(Graphics gg, boolean hiddenRows, SequenceI s,
@@ -393,4 +396,15 @@ public class IdCanvas extends Panel
     }
     return false;
   }
+
+  @Override
+  public void propertyChange(PropertyChangeEvent evt)
+  {
+    // Respond to viewport range changes (e.g. alignment panel was scrolled)
+    if (evt.getPropertyName().equals("startseq")
+            || evt.getPropertyName().equals("endseq"))
+    {
+      fastPaint((int) evt.getNewValue() - (int) evt.getOldValue());
+    }
+  }
 }