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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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz
# See COPYING file for copyrights details.
from __future__ import absolute_import
from util.TranslationCatalogs import NoTranslate
_ = NoTranslate
ITEMS_EDITABLE = [
ITEM_PROJECT,
ITEM_POU,
ITEM_VARIABLE,
ITEM_TRANSITION,
ITEM_ACTION,
ITEM_CONFIGURATION,
ITEM_RESOURCE,
ITEM_DATATYPE
] = range(8)
ITEMS_UNEDITABLE = [
ITEM_DATATYPES,
ITEM_FUNCTION,
ITEM_FUNCTIONBLOCK,
ITEM_PROGRAM,
ITEM_TRANSITIONS,
ITEM_ACTIONS,
ITEM_CONFIGURATIONS,
ITEM_RESOURCES,
ITEM_PROPERTIES
] = range(8, 17)
ITEMS_VARIABLE = [
ITEM_VAR_LOCAL,
ITEM_VAR_GLOBAL,
ITEM_VAR_EXTERNAL,
ITEM_VAR_TEMP,
ITEM_VAR_INPUT,
ITEM_VAR_OUTPUT,
ITEM_VAR_INOUT
] = range(17, 24)
ITEM_CONFNODE = 25
VAR_CLASS_INFOS = {
"Local": ("localVars", ITEM_VAR_LOCAL),
"Global": ("globalVars", ITEM_VAR_GLOBAL),
"External": ("externalVars", ITEM_VAR_EXTERNAL),
"Temp": ("tempVars", ITEM_VAR_TEMP),
"Input": ("inputVars", ITEM_VAR_INPUT),
"Output": ("outputVars", ITEM_VAR_OUTPUT),
"InOut": ("inOutVars", ITEM_VAR_INOUT)}
POU_TYPES = {
"program": ITEM_PROGRAM,
"functionBlock": ITEM_FUNCTIONBLOCK,
"function": ITEM_FUNCTION,
}
CLASS_TYPES = {
"configuration": ITEM_CONFIGURATION,
"resource": ITEM_RESOURCE,
"action": ITEM_ACTION,
"transition": ITEM_TRANSITION,
"program": ITEM_PROGRAM
}
LOCATIONS_ITEMS = [LOCATION_CONFNODE,
LOCATION_MODULE,
LOCATION_GROUP,
LOCATION_VAR_INPUT,
LOCATION_VAR_OUTPUT,
LOCATION_VAR_MEMORY] = range(6)
UNEDITABLE_NAMES = [_("User-defined POUs"), _("Functions"), _("Function Blocks"),
_("Programs"), _("Data Types"), _("Transitions"), _("Actions"),
_("Configurations"), _("Resources"), _("Properties")]
[USER_DEFINED_POUS, FUNCTIONS, FUNCTION_BLOCKS, PROGRAMS,
DATA_TYPES, TRANSITIONS, ACTIONS, CONFIGURATIONS,
RESOURCES, PROPERTIES] = UNEDITABLE_NAMES
# -------------------------------------------------------------------------------
# Project Element tag name computation functions
# -------------------------------------------------------------------------------
# Compute a data type name
def ComputeDataTypeName(datatype):
return "D::%s" % datatype
# Compute a pou name
def ComputePouName(pou):
return "P::%s" % pou
# Compute a pou transition name
def ComputePouTransitionName(pou, transition):
return "T::%s::%s" % (pou, transition)
# Compute a pou action name
def ComputePouActionName(pou, action):
return "A::%s::%s" % (pou, action)
# Compute a pou name
def ComputeConfigurationName(config):
return "C::%s" % config
# Compute a pou name
def ComputeConfigurationResourceName(config, resource):
return "R::%s::%s" % (config, resource)
def GetElementType(tagname):
words = tagname.split("::")
return {
"D": ITEM_DATATYPE,
"P": ITEM_POU,
"T": ITEM_TRANSITION,
"A": ITEM_ACTION,
"C": ITEM_CONFIGURATION,
"R": ITEM_RESOURCE
}[words[0]]
# remove gettext override
del _