beremiz

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

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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

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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

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/*
Stylesheet used to list EtherCat dictionnary entries.
Copyright (C) 2011-2014: Laurent BESSARD
Distributed under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
See COPYING file for copyrights details.
*/
include yslt.yml2
estylesheet xmlns:ns="entries_list_ns"
extension-element-prefixes="ns"
exclude-result-prefixes="ns" {
param "min_index";
param "max_index";
template "text()";
template "Device" {
apply "Profile/Dictionary/Objects/Object";
foreach "RxPdo" {
call "pdo_entries" with "direction", "'Receive'";
}
foreach "TxPdo" {
call "pdo_entries" with "direction", "'Transmit'";
}
}
template "Object" {
variable "index" > «ns:HexDecValue(Index/text())»
variable "entry_name" > «ns:EntryName(Name)»
choose {
when "$index >= $min_index and $index <= $max_index" {
variable "datatype_name" > «Type/text()»
choose {
when "ancestor::Dictionary/child::DataTypes/DataType[Name/text()=$datatype_name][SubItem]" {
apply "ancestor::Dictionary/child::DataTypes/DataType[Name/text()=$datatype_name][SubItem]" {
with "index" > «$index»
with "entry_name" > «$entry_name»
}
}
otherwise {
variable "subindex" > 0
variable "entry" {
> «ns:AddEntry($index, $subindex, $entry_name, $datatype_name, BitSize/text(), Flags/Access/text(), Flags/PdoMapping/text())»
}
}
}
}
}
}
template "DataType" {
param "index";
param "entry_name";
foreach "SubItem" {
variable "subindex" > «ns:HexDecValue(SubIdx/text())»
variable "subentry_name" > «$entry_name» - «ns:EntryName(DisplayName, Name/text())»
variable "entry" {
> «ns:AddEntry($index, $subindex, $subentry_name, Type/text(), BitSize/text(), Flags/Access/text(), Flags/PdoMapping/text())»
}
}
}
function "pdo_entries" {
param "direction";
variable "pdo_index" > «ns:HexDecValue(Index/text())»
variable "pdo_name" > «ns:EntryName(Name)»
foreach "Entry" {
variable "index" > «ns:HexDecValue(Index/text())»
choose {
when "$index >= $min_index and $index <= $max_index" {
variable "subindex" > «ns:HexDecValue(SubIndex/text())»
variable "subentry_name" > «ns:EntryName(Name)»
variable "access" {
choose {
when "$direction='Transmit'" > ro
otherwise > wo
}
}
variable "pdo_mapping" {
choose {
when "$direction='Transmit'" > T
otherwise > R
}
}
variable "entry" {
> «ns:AddEntry($index, $subindex, $subentry_name, DataType/text(), BitLen/text(), $access, $pdo_mapping, $pdo_index, $pdo_name, $direction)»
}
}
}
}
}
}