From 09812fe5dfaeb4a96485362bfdb3406ff9958a2e Mon Sep 17 00:00:00 2001
From: "Peter A. Bigot" <pab@pabigot.com>
Date: Sat, 15 Jun 2013 12:12:22 -0500
Subject: [PATCH] cooja TimeLine: support mouse wheel zoom

Add listener that zooms based on mouse wheel.  The zoom center is the
mouse position, which alleviates the pressure to touch pabigot/contikix#4.

Closes pabigot/contikix#5

Signed-off-by: Peter A. Bigot <pab@pabigot.com>
---
 tools/cooja/java/se/sics/cooja/plugins/TimeLine.java | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/cooja/java/se/sics/cooja/plugins/TimeLine.java b/tools/cooja/java/se/sics/cooja/plugins/TimeLine.java
index 730af29d7..cfd29ceea 100644
--- a/tools/cooja/java/se/sics/cooja/plugins/TimeLine.java
+++ b/tools/cooja/java/se/sics/cooja/plugins/TimeLine.java
@@ -43,6 +43,7 @@ import java.awt.event.ActionListener;
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
+import java.awt.event.MouseWheelEvent;
 import java.io.BufferedWriter;
 import java.io.File;
 import java.io.FileOutputStream;
@@ -1499,6 +1500,7 @@ public class TimeLine extends VisPlugin implements HasQuickHelp {
 
       addMouseListener(mouseAdapter);
       addMouseMotionListener(mouseAdapter);
+      addMouseWheelListener(mouseAdapter);
 
       /* Popup menu */
       final JPopupMenu popupMenu = new JPopupMenu();
@@ -1696,6 +1698,16 @@ public class TimeLine extends VisPlugin implements HasQuickHelp {
         mousePixelPositionX = -1;
         repaint();
       }
+      public void mouseWheelMoved(MouseWheelEvent e) {
+        if (e.isControlDown()) {
+          final int nticks = e.getWheelRotation();
+          final int zoomLevel = zoomGetLevel() + nticks;
+          final long zct = (long) (e.getX()*currentPixelDivisor);
+          final double zc = (double) (e.getX() - timeline.getVisibleRect().x) / timeline.getVisibleRect().width;
+          zoomFinishLevel(zoomLevel, zct, zc);
+          return;
+        }
+      }
     };
 
     private final Color SEPARATOR_COLOR = new Color(220, 220, 220);