[pitivi: 1/5] ui.timelinecanvas: snap razor to playhead position

[Edward Hervey <edwardrv src gnome org>]

commit f6636c3c7c68e6d2d6be8785dc5e336aa7dcdcf5
Author: Brandon Lewis <brandon_lewis berkeley edu>
Date:   Wed Apr 15 11:37:40 2009 -0700

    ui.timelinecanvas: snap razor to playhead position
---
 pitivi/ui/timeline.py       |    1 +
 pitivi/ui/timelinecanvas.py |    8 +++++++-
 2 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/pitivi/ui/timeline.py b/pitivi/ui/timeline.py
index 3b02e13..9ee11fe 100644
--- a/pitivi/ui/timeline.py
+++ b/pitivi/ui/timeline.py
@@ -300,6 +300,7 @@ class Timeline(gtk.Table, Loggable, Zoomable):
     def timelinePositionChanged(self, position):
         self._position = position
         self.ruler.timelinePositionChanged(position)
+        self._canvas._position = position
         self.scrollToPlayhead()
 
     def scrollToPlayhead(self):
diff --git a/pitivi/ui/timelinecanvas.py b/pitivi/ui/timelinecanvas.py
index f130ad7..e09eb27 100644
--- a/pitivi/ui/timelinecanvas.py
+++ b/pitivi/ui/timelinecanvas.py
@@ -48,6 +48,7 @@ class TimelineCanvas(goocanvas.Canvas, Zoomable):
         self._selected_sources = []
         self._tracks = []
         self._height = 0
+        self._position = 0
 
         self._block_size_request = False
         self.props.integer_layout = True
@@ -172,8 +173,13 @@ class TimelineCanvas(goocanvas.Canvas, Zoomable):
         self._razor.props.visibility = goocanvas.ITEM_INVISIBLE
 
     def _razorMovedCb(self, canvas, event):
+        def snap(x):
+            pos = self.nsToPixel(self._position)
+            if abs(x - pos) <= DEADBAND:
+                return pos
+            return x
         x, y = self.convert_from_pixels(event.x, event.y)
-        self._razor.props.x = self.nsToPixel(self.pixelToNs(x))
+        self._razor.props.x = snap(self.nsToPixel(self.pixelToNs(x)))
         return True
 
     def _razorReleasedCb(self, unused_canvas, event):