HGKeeper

Fix 'DoGetTextExtent - invalid DC' error

2018-06-26, Andrey Skvortsov

3c94bac4526e

Fix 'DoGetTextExtent - invalid DC' error

most likely this error happens only on certain wx backends.
GTK3+ on GNU/Linux is apparently one of them.
The problem is described in wxWidgets issue tracker.
http://trac.wxwidgets.org/ticket/12486

[-------------------------------------------------------------------------------------------------------------------]
platform:
Linux-4.16.0-2-rt-amd64-x86_64-with-debian-buster-sid

python-version:
2.7.15

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1605, in DispatchDebugValuesProc
self.CallWeakcallables("__tick__", "NewDataAvailable", debug_ticks)
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1585, in CallWeakcallables
function(*cargs)
File "/home/developer/WorkData/PLC/beremiz/beremiz/editors/Viewer.py", line 1217, in NewDataAvailable
refresh_rect.Union(element.GetRedrawRect())
File "/home/developer/WorkData/PLC/beremiz/beremiz/graphics/GraphicCommons.py", line 1609, in GetRedrawRect
self.ValueSize = self.Parent.GetMiniTextExtent(self.ComputedValue)
File "/home/developer/WorkData/PLC/beremiz/beremiz/editors/Viewer.py", line 932, in GetMiniTextExtent
return self.MiniTextDC.GetTextExtent(text)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_gdi.py", line 4127, in GetTextExtent
return _gdi_.DC_GetTextExtent(*args, **kwargs)
: C++ assertion "m_graphicContext" failed at ../src/common/dcgraph.cpp(1160) in DoGetTextExtent(): wxGCDC(cg)::DoGetTextExtent - invalid DC

wx-platform:
__WXGTK__

wx-version:
3.0.2.0

[-------------------------------------------------------------------------------------------------------------------]

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/LogViewer.py", line 740, in OnMessageToolTipTimer
self.MessageToolTip.SetFont(self.Font)
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 75, in SetFont
self.RefreshTip()
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 158, in RefreshTip
self.SetClientSize(self.GetToolTipSize())
File "/home/developer/WorkData/PLC/beremiz/beremiz/controls/CustomToolTip.py", line 145, in GetToolTipSize
w, h = dc.GetTextExtent(line)
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk3/wx/_gdi.py", line 4127, in GetTextExtent
return _gdi_.DC_GetTextExtent(*args, **kwargs)
: C++ assertion "m_graphicContext" failed at ../src/common/dcgraph.cpp(1160) in DoGetTextExtent(): wxGCDC(cg)::DoGetTextExtent - invalid DC

[-------------------------------------------------------------------------------------------------------------------]

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://www.plcopen.org/xml/tc6.xsd"

xsi:schemaLocation="http://www.plcopen.org/xml/tc6.xsd"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:xhtml="http://www.w3.org/1999/xhtml">

<fileHeader companyName="Unknown"

productName="Unnamed"

productVersion="1"

creationDateTime="2013-01-29T14:01:00"/>

<contentHeader name="Unnamed"

modificationDateTime="2013-02-26T15:59:13">

<fbd>

</fbd>

<ld>

</ld>

<sfc>

</sfc>

</coordinateInfo>

</contentHeader>

<types>

<enum>

</values>

</enum>

</baseType>

</initialValue>

</dataType>

</dataTypes>

<pous>

<type>

<BOOL/>

</type>

</variable>

<type>

</type>

</variable>

<type>

</type>

</initialValue>

</variable>

</inputVars>

<type>

<BOOL/>

</type>

</variable>

</localVars>

</interface>

<body>

<ST>

<![CDATA[IF TRIG AND NOT TRIG0 THEN

{{

LogMessage(GetFbVar(LEVEL),(char*)GetFbVar(MSG, .body),GetFbVar(MSG, .len));

}}

END_IF;

TRIG0:=TRIG;

]]>

</ST>

</body>

</pou>

</pous>

</types>

</instances>

</project>