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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# -*- 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 re
from types import TupleType
import wx
from controls import CustomEditableListBox
# -------------------------------------------------------------------------------
# Helpers
# -------------------------------------------------------------------------------
DIMENSION_MODEL = re.compile("([0-9]+)\.\.([0-9]+)$")
# -------------------------------------------------------------------------------
# Array Type Dialog
# -------------------------------------------------------------------------------
class ArrayTypeDialog(wx.Dialog):
def __init__(self, parent, datatypes, infos):
wx.Dialog.__init__(self, parent, title=_('Edit array type properties'))
main_sizer = wx.FlexGridSizer(cols=1, hgap=0, rows=3, vgap=10)
main_sizer.AddGrowableCol(0)
main_sizer.AddGrowableRow(1)
top_sizer = wx.BoxSizer(wx.HORIZONTAL)
main_sizer.AddSizer(top_sizer, border=20,
flag=wx.GROW | wx.TOP | wx.LEFT | wx.RIGHT)
basetype_label = wx.StaticText(self, label=_('Base Type:'))
top_sizer.AddWindow(basetype_label, 1, flag=wx.ALIGN_BOTTOM)
self.BaseType = wx.ComboBox(self, style=wx.CB_READONLY)
top_sizer.AddWindow(self.BaseType, 1, flag=wx.GROW)
self.Dimensions = CustomEditableListBox(self, label=_("Dimensions:"),
style=(wx.gizmos.EL_ALLOW_NEW |
wx.gizmos.EL_ALLOW_EDIT |
wx.gizmos.EL_ALLOW_DELETE))
for func in ["_OnLabelEndEdit",
"_OnAddButton",
"_OnDelButton",
"_OnUpButton",
"_OnDownButton"]:
setattr(self.Dimensions, func, self.OnDimensionsChanged)
main_sizer.AddSizer(self.Dimensions, border=20,
flag=wx.GROW | wx.LEFT | wx.RIGHT)
button_sizer = self.CreateButtonSizer(wx.OK | wx.CANCEL | wx.CENTRE)
self.Bind(wx.EVT_BUTTON, self.OnOK, button_sizer.GetAffirmativeButton())
main_sizer.AddSizer(button_sizer, border=20,
flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
self.SetSizer(main_sizer)
for datatype in datatypes:
self.BaseType.Append(datatype)
if isinstance(infos, TupleType) and infos[0] == "array":
self.BaseType.SetStringSelection(infos[1])
self.Dimensions.SetStrings(map("..".join, infos[2]))
elif infos in datatypes:
self.BaseType.SetStringSelection(infos)
self.BaseType.SetFocus()
self.Fit()
def GetDimensions(self):
message = None
dimensions_list = []
dimension_strings = self.Dimensions.GetStrings()
if len(dimension_strings) == 0:
message = _("Empty dimension isn't allowed.")
for dimensions in dimension_strings:
result = DIMENSION_MODEL.match(dimensions)
if result is None:
message = _("\"%s\" value isn't a valid array dimension!") % dimensions
break
bounds = result.groups()
if int(bounds[0]) >= int(bounds[1]):
message = _("\"%s\" value isn't a valid array dimension!\nRight value must be greater than left value.") % dimensions
break
dimensions_list.append(bounds)
if message is not None:
dlg = wx.MessageDialog(self, message, _("Error"), wx.OK | wx.ICON_ERROR)
dlg.ShowModal()
dlg.Destroy()
return None
return dimensions_list
def OnDimensionsChanged(self, event):
wx.CallAfter(self.GetDimensions)
event.Skip()
def OnOK(self, event):
if self.GetDimensions() is not None:
self.EndModal(wx.ID_OK)
def GetValue(self):
return "array", self.BaseType.GetStringSelection(), self.GetDimensions()