[tauruslib-devel] [PATCH 3/3] Fix scale problem when autoscroll is set before model

[<cpa...@ce...>]

From: cpascual <cpa...@ce...>

In TaurusTrend2D, setting the autoscroll before the model triggers a bug
that permanently sets the scale range to min,max = 0,0, preventing
correct display of the data. Fix it by ignoring scroll requests before
the axis is properly set.
---
 lib/taurus/qt/qtgui/extra_guiqwt/tools.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/taurus/qt/qtgui/extra_guiqwt/tools.py b/lib/taurus/qt/qtgui/extra_guiqwt/tools.py
index ae03eb3..4521312 100644
--- a/lib/taurus/qt/qtgui/extra_guiqwt/tools.py
+++ b/lib/taurus/qt/qtgui/extra_guiqwt/tools.py
@@ -251,6 +251,9 @@ class AutoScrollTool(ToggleTool, BaseConfigurableClass):
     def onScrollRequested(self, plot, axis, value):
         scalemin, scalemax = plot.get_axis_limits(axis)
         scaleRange = abs(scalemax - scalemin)
+        # ignore requests that imply setting a null range
+        if scaleRange == 0:
+            return
         xmin = value - scaleRange * (1. - self.scrollFactor)
         xmax = value + scaleRange * self.scrollFactor
         plot.set_axis_limits(axis, xmin, xmax)
-- 
2.8.1