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 wx
import wx.gizmos
class CustomEditableListBox(wx.gizmos.EditableListBox):
def __init__(self, *args, **kwargs):
wx.gizmos.EditableListBox.__init__(self, *args, **kwargs)
listbox = self.GetListCtrl()
listbox.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
listbox.Bind(wx.EVT_LIST_BEGIN_LABEL_EDIT, self.OnLabelBeginEdit)
listbox.Bind(wx.EVT_LIST_END_LABEL_EDIT, self.OnLabelEndEdit)
for button, tooltip, call_function in [
(self.GetEditButton(), _("Edit item"), "_OnEditButton"),
(self.GetNewButton(), _("New item"), "_OnNewButton"),
(self.GetDelButton(), _("Delete item"), "_OnDelButton"),
(self.GetUpButton(), _("Move up"), "_OnUpButton"),
(self.GetDownButton(), _("Move down"), "_OnDownButton")]:
button.SetToolTipString(tooltip)
button.Bind(wx.EVT_BUTTON, self.GetButtonPressedFunction(call_function))
self.Editing = False
def EnsureCurrentItemVisible(self):
listctrl = self.GetListCtrl()
listctrl.EnsureVisible(listctrl.GetFocusedItem())
def OnLabelBeginEdit(self, event):
self.Editing = True
func = getattr(self, "_OnLabelBeginEdit", None)
if func is not None:
func(event)
else:
event.Skip()
def OnLabelEndEdit(self, event):
self.Editing = False
func = getattr(self, "_OnLabelEndEdit", None)
if func is not None:
func(event)
else:
event.Skip()
def GetButtonPressedFunction(self, call_function):
def OnButtonPressed(event):
if wx.Platform != '__WXMSW__' or not self.Editing:
func = getattr(self, call_function, None)
if func is not None:
func(event)
wx.CallAfter(self.EnsureCurrentItemVisible)
else:
wx.CallAfter(self.EnsureCurrentItemVisible)
event.Skip()
return OnButtonPressed
def OnKeyDown(self, event):
button = None
keycode = event.GetKeyCode()
if keycode in (wx.WXK_ADD, wx.WXK_NUMPAD_ADD):
button = self.GetNewButton()
elif keycode in (wx.WXK_DELETE, wx.WXK_NUMPAD_DELETE):
button = self.GetDelButton()
elif keycode == wx.WXK_UP and event.ShiftDown():
button = self.GetUpButton()
elif keycode == wx.WXK_DOWN and event.ShiftDown():
button = self.GetDownButton()
elif keycode == wx.WXK_SPACE:
button = self.GetEditButton()
if button is not None and button.IsEnabled():
button.ProcessEvent(wx.CommandEvent(wx.EVT_BUTTON.typeId, button.GetId()))
else:
event.Skip()