HGKeeper

Fix 'DoGetTextExtent - invalid DC' error

2018-06-26, Andrey Skvortsov

3c94bac4526e

Executable

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.

# This file is based on code written for Whyteboard project.

# 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.

"""

This module contains classes extended from wx.Dialog used by the GUI.

"""

from __future__ import absolute_import

import os

import wx

from wx.lib.agw.hyperlink import HyperLinkCtrl

class AboutDialog(wx.Dialog):

"""

A replacement About Dialog for Windows, as it uses a generic frame that

well...sucks.

"""

def __init__(self, parent, info):

title = _("About") + " " + info.Name

wx.Dialog.__init__(self, parent, title=title)

self.info = info

if parent and parent.GetIcon():

self.SetIcon(parent.GetIcon())

image = None

if self.info.Icon:

bitmap = wx.BitmapFromIcon(self.info.Icon)

image = wx.StaticBitmap(self, bitmap=bitmap)

name = wx.StaticText(self, label="%s %s" % (info.Name, info.Version))

description = wx.StaticText(self, label=info.Description)

description.Wrap(400)

url = HyperLinkCtrl(self, label=info.WebSite[0], URL=info.WebSite[1])

font = name.GetClassDefaultAttributes().font

font.SetWeight(wx.FONTWEIGHT_BOLD)

font.SetPointSize(18)

name.SetFont(font)

credits = wx.Button(self, id=wx.ID_ABOUT, label=_("C&redits"))

license = wx.Button(self, label=_("&License"))

close = wx.Button(self, id=wx.ID_CANCEL, label=_("&Close"))

btnSizer = wx.BoxSizer(wx.HORIZONTAL)

btnSizer.Add(credits, flag=wx.CENTER | wx.LEFT | wx.RIGHT, border=5)

btnSizer.Add(license, flag=wx.CENTER | wx.RIGHT, border=5)

btnSizer.Add(close, flag=wx.CENTER | wx.RIGHT, border=5)

sizer = wx.BoxSizer(wx.VERTICAL)

if image:

sizer.Add(image, flag=wx.CENTER | wx.TOP | wx.BOTTOM, border=5)

sizer.Add(name, flag=wx.CENTER | wx.BOTTOM, border=10)

sizer.Add(description, flag=wx.CENTER | wx.BOTTOM, border=10)

sizer.Add(copyright, flag=wx.CENTER | wx.BOTTOM, border=10)

sizer.Add(url, flag=wx.CENTER | wx.BOTTOM, border=15)

sizer.Add(btnSizer, flag=wx.CENTER | wx.BOTTOM, border=5)

container = wx.BoxSizer(wx.VERTICAL)

container.Add(sizer, flag=wx.ALL, border=10)

self.SetSizer(container)

self.Layout()

self.Fit()

self.Centre()

self.Show(True)

self.SetEscapeId(close.GetId())

credits.Bind(wx.EVT_BUTTON, self.on_credits)

license.Bind(wx.EVT_BUTTON, self.on_license)

close.Bind(wx.EVT_BUTTON, lambda evt: self.Destroy())

def on_license(self, event):

LicenseDialog(self, self.info)

def on_credits(self, event):

CreditsDialog(self, self.info)

class CreditsDialog(wx.Dialog):

def __init__(self, parent, info):

wx.Dialog.__init__(self, parent, title=_("Credits"), size=(475, 320),

style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER)

if parent and parent.GetIcon():

self.SetIcon(parent.GetIcon())

self.SetMinSize((300, 200))

notebook = wx.Notebook(self)

close = wx.Button(self, id=wx.ID_CLOSE, label=_("&Close"))

close.SetDefault()

developer = wx.TextCtrl(notebook, style=wx.TE_READONLY | wx.TE_MULTILINE)

translators = wx.TextCtrl(notebook, style=wx.TE_READONLY | wx.TE_MULTILINE)

developer.SetValue(u'\n'.join(info.Developers))

translators.SetValue(u'\n'.join(info.Translators))

notebook.AddPage(developer, text=_("Written by"))

notebook.AddPage(translators, text=_("Translated by"))

btnSizer = wx.BoxSizer(wx.HORIZONTAL)

btnSizer.Add(close)

sizer = wx.BoxSizer(wx.VERTICAL)

sizer.Add(notebook, 1, wx.EXPAND | wx.ALL, 10)

sizer.Add(btnSizer, flag=wx.ALIGN_RIGHT | wx.RIGHT | wx.BOTTOM, border=10)

self.SetSizer(sizer)

self.Layout()

self.Show()

self.SetEscapeId(close.GetId())

close.Bind(wx.EVT_BUTTON, lambda evt: self.Destroy())

class LicenseDialog(wx.Dialog):

def __init__(self, parent, info):

wx.Dialog.__init__(self, parent, title=_("License"), size=(500, 400),

style=wx.DEFAULT_DIALOG_STYLE | wx.RESIZE_BORDER)

if parent and parent.GetIcon():

self.SetIcon(parent.GetIcon())

self.SetMinSize((400, 300))

close = wx.Button(self, id=wx.ID_CLOSE, label=_("&Close"))

ctrl = wx.TextCtrl(self, style=wx.TE_READONLY | wx.TE_MULTILINE)

ctrl.SetValue(info.License)

btnSizer = wx.BoxSizer(wx.HORIZONTAL)

btnSizer.Add(close)

sizer = wx.BoxSizer(wx.VERTICAL)

sizer.Add(ctrl, 1, wx.EXPAND | wx.ALL, 10)

sizer.Add(btnSizer, flag=wx.ALIGN_RIGHT | wx.RIGHT | wx.BOTTOM, border=10)

self.SetSizer(sizer)

self.Layout()

self.Show()

self.SetEscapeId(close.GetId())

close.Bind(wx.EVT_BUTTON, lambda evt: self.Destroy())

def ShowAboutDialog(parent, info):

if os.name == "nt":

AboutDialog(parent, info)

else:

wx.AboutBox(info)