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

[-------------------------------------------------------------------------------------------------------------------]
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, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from __future__ import absolute_import
import keyword
import wx.stc as stc
from controls.CustomStyledTextCtrl import faces
from editors.CodeFileEditor import CodeFileEditor, CodeEditor
class PythonCodeEditor(CodeEditor):
KEYWORDS = keyword.kwlist
COMMENT_HEADER = "#"
def SetCodeLexer(self):
self.SetLexer(stc.STC_LEX_PYTHON)
# Line numbers in margin
self.StyleSetSpec(stc.STC_STYLE_LINENUMBER, 'fore:#000000,back:#99A9C2,size:%(size)d' % faces)
# Highlighted brace
self.StyleSetSpec(stc.STC_STYLE_BRACELIGHT, 'fore:#00009D,back:#FFFF00,size:%(size)d' % faces)
# Unmatched brace
self.StyleSetSpec(stc.STC_STYLE_BRACEBAD, 'fore:#00009D,back:#FF0000,size:%(size)d' % faces)
# Indentation guide
self.StyleSetSpec(stc.STC_STYLE_INDENTGUIDE, 'fore:#CDCDCD,size:%(size)d' % faces)
# Python styles
self.StyleSetSpec(stc.STC_P_DEFAULT, 'fore:#000000,size:%(size)d' % faces)
# Comments
self.StyleSetSpec(stc.STC_P_COMMENTLINE, 'fore:#008000,back:#F0FFF0,size:%(size)d' % faces)
self.StyleSetSpec(stc.STC_P_COMMENTBLOCK, 'fore:#008000,back:#F0FFF0,size:%(size)d' % faces)
# Numbers
self.StyleSetSpec(stc.STC_P_NUMBER, 'fore:#008080,size:%(size)d' % faces)
# Strings and characters
self.StyleSetSpec(stc.STC_P_STRING, 'fore:#800080,size:%(size)d' % faces)
self.StyleSetSpec(stc.STC_P_CHARACTER, 'fore:#800080,size:%(size)d' % faces)
# Keywords
self.StyleSetSpec(stc.STC_P_WORD, 'fore:#000080,bold,size:%(size)d' % faces)
# Triple quotes
self.StyleSetSpec(stc.STC_P_TRIPLE, 'fore:#800080,back:#FFFFEA,size:%(size)d' % faces)
self.StyleSetSpec(stc.STC_P_TRIPLEDOUBLE, 'fore:#800080,back:#FFFFEA,size:%(size)d' % faces)
# Class names
self.StyleSetSpec(stc.STC_P_CLASSNAME, 'fore:#0000FF,bold,size:%(size)d' % faces)
# Function names
self.StyleSetSpec(stc.STC_P_DEFNAME, 'fore:#008080,bold,size:%(size)d' % faces)
# Operators
self.StyleSetSpec(stc.STC_P_OPERATOR, 'fore:#800000,bold,size:%(size)d' % faces)
# Identifiers. I leave this as not bold because everything seems
# to be an identifier if it doesn't match the above criterae
self.StyleSetSpec(stc.STC_P_IDENTIFIER, 'fore:#000000,size:%(size)d' % faces)
# -------------------------------------------------------------------------------
# CFileEditor Main Frame Class
# -------------------------------------------------------------------------------
class PythonEditor(CodeFileEditor):
CONFNODEEDITOR_TABS = [
(_("Python code"), "_create_CodePanel")]
CODE_EDITOR = PythonCodeEditor