Made scrollwheel work in the update gui

CHANGES.txt

@@ -3,6 +3,12 @@ TradeDangerous, Copyright (C) Oliver "kfsone" Smith, July 2014
 ==============================================================================
 
 v6.0.3 WIP
+. (kfsone) Added a GUI to the "update" sub-command, it's experimental:
+   - Use <tab>/<shift-tab> to cycle across rows,
+   - Use <enter> to drop to the first column of the next line,
+   - Scrolling is currently broken - you have to manually scroll. Ick.
+   - Use the "--exp" flag to indicate your understanding it is experimental.
+     e.g.: trade.py update --exp aulin
 . (kfsone) Fixed sqrt crash in buildCache.py in multi-station systems
 
 BETA 3: 

commands/update_cmd.py

@@ -46,6 +46,12 @@
             default=False,
             dest='forceNa',
         ),
+    ParseArgument('--experimental-gui', '-G',
+            help="Use the experimental built-in GUI",
+            action='store_true',
+            default=False,
+            dest='gui',
+        ),
     MutuallyExclusiveGroup(
         ParseArgument('--sublime', 
                 help='Like --editor but uses Sublime Text (2 or 3), which is nice.',
@@ -288,8 +294,14 @@ def guidedUpdate(tdb, cmdenv):
 
 def run(results, cmdenv, tdb):
     if not cmdenv.editor and not cmdenv.editing:
-        guidedUpdate(tdb, cmdenv)
-        return None
+        if cmdenv.gui:
+            guidedUpdate(tdb, cmdenv)
+            return None
+        raise CommandLineError(
+            "The GUI for updates is currently experimental. "
+            "Either use one of the editors or specify the "
+            "--experimental-gui (--exp or -G for short) "
+            "flags.\n")
 
     # User specified one of the options to use an editor.
     editUpdate(tdb, cmdenv, cmdenv.startStation.ID)

commands/update_gui.py

@@ -15,9 +15,12 @@ def __init__(self, root, dbPath, stationID):
         tk.Frame.__init__(self, root)
 
         self.root = root
+        self.style = ttk.Style()
+        self.style.theme_use("default")
 
-        self.canvas = tk.Canvas(root, borderwidth=0, background="#ffffff")
-        self.frame = tk.Frame(self.canvas, background="#ffffff")
+        self.canvas = tk.Canvas(root, borderwidth=0)
+        self.canvas.bind_all("<MouseWheel>", self.onMouseWheel)
+        self.frame = tk.Frame(self.canvas)
         self.vsb = tk.Scrollbar(root, orient="vertical", command=self.canvas.yview)
         self.canvas.configure(yscrollcommand=self.vsb.set)
 
@@ -43,6 +46,10 @@ def onFrameConfigure(self, event):
         self.canvas.configure(scrollregion=self.canvas.bbox("all"))
 
 
+    def onMouseWheel(self, event):
+        self.canvas.yview_scroll(int(-1 * (event.delta/120)), "units")
+
+
     def query(self, itemName, pos):
         item = self.items[itemName]
         row = self.itemDisplays[item.displayNo]