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

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

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

[-------------------------------------------------------------------------------------------------------------------]
#!/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 wx
from plcopen.structures import TestIdentifier, IEC_KEYWORDS
# -------------------------------------------------------------------------------
# Edit Step Name Dialog
# -------------------------------------------------------------------------------
class SFCStepNameDialog(wx.TextEntryDialog):
def __init__(self, parent, message, caption="Please enter text", defaultValue="",
style=wx.OK | wx.CANCEL | wx.CENTRE, pos=wx.DefaultPosition):
wx.TextEntryDialog.__init__(self, parent, message, caption, defaultValue, style, pos)
self.PouNames = []
self.Variables = []
self.StepNames = []
self.Bind(wx.EVT_BUTTON, self.OnOK,
self.GetSizer().GetItem(2).GetSizer().GetItem(1).GetSizer().GetAffirmativeButton())
def OnOK(self, event):
message = None
step_name = self.GetSizer().GetItem(1).GetWindow().GetValue()
if step_name == "":
message = _("You must type a name!")
elif not TestIdentifier(step_name):
message = _("\"%s\" is not a valid identifier!") % step_name
elif step_name.upper() in IEC_KEYWORDS:
message = _("\"%s\" is a keyword. It can't be used!") % step_name
elif step_name.upper() in self.PouNames:
message = _("A POU named \"%s\" already exists!") % step_name
elif step_name.upper() in self.Variables:
message = _("A variable with \"%s\" as name already exists in this pou!") % step_name
elif step_name.upper() in self.StepNames:
message = _("\"%s\" step already exists!") % step_name
if message is not None:
dialog = wx.MessageDialog(self, message, _("Error"), wx.OK | wx.ICON_ERROR)
dialog.ShowModal()
dialog.Destroy()
else:
self.EndModal(wx.ID_OK)
event.Skip()
def SetPouNames(self, pou_names):
self.PouNames = [pou_name.upper() for pou_name in pou_names]
def SetVariables(self, variables):
self.Variables = [var.Name.upper() for var in variables]
def SetStepNames(self, step_names):
self.StepNames = [step_name.upper() for step_name in step_names]