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) 2012: 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 os
import wx
# -------------------------------------------------------------------------------
# Library Structures
# -------------------------------------------------------------------------------
BitmapLibrary = {}
BitmapFolders = []
# -------------------------------------------------------------------------------
# Library Helpers
# -------------------------------------------------------------------------------
def AddBitmapFolder(path):
if os.path.exists(path) and os.path.isdir(path) and path not in BitmapFolders:
BitmapFolders.append(path)
def SearchBitmap(bmp_name):
for folder in BitmapFolders:
bmp_path = os.path.join(folder, bmp_name + ".png")
if os.path.isfile(bmp_path):
return wx.Bitmap(bmp_path)
return None
def GetBitmap(bmp_name1, bmp_name2=None, size=None):
bmp = BitmapLibrary.get((bmp_name1, bmp_name2, size))
if bmp is not None:
return bmp
if bmp_name2 is None:
bmp = SearchBitmap(bmp_name1)
else:
# Bitmap with two icon
bmp1 = SearchBitmap(bmp_name1)
bmp2 = SearchBitmap(bmp_name2)
if bmp1 is not None and bmp2 is not None:
# Calculate bitmap size
width = bmp1.GetWidth() + bmp2.GetWidth() - 1
height = max(bmp1.GetHeight(), bmp2.GetHeight())
# Create bitmap with both icons
bmp = wx.EmptyBitmap(width, height)
dc = wx.MemoryDC()
dc.SelectObject(bmp)
dc.Clear()
dc.DrawBitmap(bmp1, 0, 0)
dc.DrawBitmap(bmp2, bmp1.GetWidth() - 1, 0)
dc.Destroy()
elif bmp1 is not None:
bmp = bmp1
elif bmp2 is not None:
bmp = bmp2
if bmp is not None:
BitmapLibrary[(bmp_name1, bmp_name2, size)] = bmp
return bmp