[Commit-gnuradio] [gnuradio] 01/13: grc: added horizontal mouse wheel scrolling

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jcorgan pushed a commit to branch master
in repository gnuradio.

commit c0251c952e0a5c0644c4395a747466781d696cf2
Author: Glenn Richardson <address@hidden>
Date:   Wed Oct 14 20:05:19 2015 -0400

    grc: added horizontal mouse wheel scrolling
---
 grc/gui/DrawingArea.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/grc/gui/DrawingArea.py b/grc/gui/DrawingArea.py
index d22a2c6..4412129 100644
--- a/grc/gui/DrawingArea.py
+++ b/grc/gui/DrawingArea.py
@@ -47,6 +47,7 @@ class DrawingArea(gtk.DrawingArea):
         self.connect('motion-notify-event', self._handle_mouse_motion)
         self.connect('button-press-event', self._handle_mouse_button_press)
         self.connect('button-release-event', self._handle_mouse_button_release)
+        self.connect('scroll-event', self._handle_mouse_scroll)
         self.add_events(
             gtk.gdk.BUTTON_PRESS_MASK | \
             gtk.gdk.POINTER_MOTION_MASK | \
@@ -83,6 +84,13 @@ class DrawingArea(gtk.DrawingArea):
         """
         self._flow_graph.add_new_block(selection_data.data, (x, y))
 
+    def _handle_mouse_scroll(self, widget, event):
+        if event.state & gtk.gdk.SHIFT_MASK:
+           if event.direction == gtk.gdk.SCROLL_UP:
+               event.direction = gtk.gdk.SCROLL_LEFT
+           else:
+               event.direction = gtk.gdk.SCROLL_RIGHT
+
     def _handle_mouse_button_press(self, widget, event):
         """
         Forward button click information to the flow graph.