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
from controls.CustomToolTip import CustomToolTip, TOOLTIP_WAIT_PERIOD
# -------------------------------------------------------------------------------
# Tool Tip Producer class
# -------------------------------------------------------------------------------
class ToolTipProducer(object):
"""
Class that implements an element that generate Tool Tip
"""
def __init__(self, parent):
"""
Constructor
@param parent: Parent Viewer
"""
self.Parent = parent
self.ToolTip = None
self.ToolTipPos = None
# Timer for firing Tool tip display
self.ToolTipTimer = wx.Timer(self.Parent, -1)
self.Parent.Bind(wx.EVT_TIMER,
self.OnToolTipTimer,
self.ToolTipTimer)
def __del__(self):
"""
Destructor
"""
self.DestroyToolTip()
def OnToolTipTimer(self, event):
"""
Callback for Tool Tip firing timer Event
@param event: Tool tip text
"""
# Get Tool Tip text
value = self.GetToolTipValue()
if value is not None and self.ToolTipPos is not None:
# Create Tool Tip
self.ToolTip = CustomToolTip(self.Parent, value)
self.ToolTip.SetToolTipPosition(self.ToolTipPos)
self.ToolTip.Show()
def GetToolTipValue(self):
"""
Return tool tip text
Have to be overridden by inherited classes
@return: Tool tip text (None if not overridden)
"""
return None
def DisplayToolTip(self, pos):
"""
Display Tool tip
@param pos: Tool tip position
"""
# Destroy current displayed Tool tip
self.DestroyToolTip()
# Save Tool Tip position
self.ToolTipPos = pos
# Start Tool tip firing timer
self.ToolTipTimer.Start(
int(TOOLTIP_WAIT_PERIOD * 1000),
oneShot=True)
def SetToolTipText(self, text):
"""
Set current Tool tip text
@param text: Tool tip Text
"""
if self.ToolTip is not None:
self.ToolTip.SetTip(text)
def DestroyToolTip(self):
"""
Destroy current displayed Tool Tip
"""
# Stop Tool tip firing timer
self.ToolTipTimer.Stop()
self.ToolTipPos = None
# Destroy Tool Tip
if self.ToolTip is not None:
self.ToolTip.Destroy()
self.ToolTip = None