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 dialogs.BrowseLocationsDialog import BrowseLocationsDialog
class LocationCellControl(wx.PyControl):
'''
Custom cell editor control with a text box and a button that launches
the BrowseLocationsDialog.
'''
def __init__(self, parent):
wx.PyControl.__init__(self, parent)
main_sizer = wx.FlexGridSizer(cols=2, hgap=0, rows=1, vgap=0)
main_sizer.AddGrowableCol(0)
main_sizer.AddGrowableRow(0)
# create location text control
self.Location = wx.TextCtrl(self, size=wx.Size(0, -1),
style=wx.TE_PROCESS_ENTER)
self.Location.Bind(wx.EVT_KEY_DOWN, self.OnLocationChar)
main_sizer.AddWindow(self.Location, flag=wx.GROW)
# create browse button
self.BrowseButton = wx.Button(self, label='...', size=wx.Size(30, -1))
self.BrowseButton.Bind(wx.EVT_BUTTON, self.OnBrowseButtonClick)
main_sizer.AddWindow(self.BrowseButton, flag=wx.GROW)
self.Bind(wx.EVT_SIZE, self.OnSize)
self.SetSizer(main_sizer)
self.Controller = None
self.VarType = None
self.Default = False
def __del__(self):
self.Controller = None
def SetController(self, controller):
self.Controller = controller
def SetVarType(self, vartype):
self.VarType = vartype
def GetVarType(self):
return self.VarType
def SetValue(self, value):
self.Default = value
self.Location.SetValue(value)
def GetValue(self):
return self.Location.GetValue()
def OnSize(self, event):
self.Layout()
def OnBrowseButtonClick(self, event):
# pop up the location browser dialog
dialog = BrowseLocationsDialog(self, self.VarType, self.Controller)
if dialog.ShowModal() == wx.ID_OK:
infos = dialog.GetValues()
else:
infos = None
dialog.Destroy()
if infos is not None:
location = infos["location"]
# set the location
if not infos["location"].startswith("%"):
dialog = wx.SingleChoiceDialog(
self,
_("Select a variable class:"),
_("Variable class"),
[_("Input"), _("Output"), _("Memory")],
wx.DEFAULT_DIALOG_STYLE | wx.OK | wx.CANCEL)
if dialog.ShowModal() == wx.ID_OK:
selected = dialog.GetSelection()
else:
selected = None
dialog.Destroy()
if selected is None:
self.Location.SetFocus()
return
if selected == 0:
location = "%I" + location
elif selected == 1:
location = "%Q" + location
else:
location = "%M" + location
self.Location.SetValue(location)
self.VarType = infos["IEC_type"]
self.Location.SetFocus()
def OnLocationChar(self, event):
keycode = event.GetKeyCode()
if keycode in [wx.WXK_RETURN, wx.WXK_TAB]:
self.Parent.Parent.ProcessEvent(event)
elif keycode == wx.WXK_ESCAPE:
self.Location.SetValue(self.Default)
self.Parent.Parent.CloseEditControl()
else:
event.Skip()
def SetInsertionPoint(self, i):
self.Location.SetInsertionPoint(i)
def SetFocus(self):
self.Location.SetFocus()
class LocationCellEditor(wx.grid.PyGridCellEditor):
'''
Grid cell editor that uses LocationCellControl to display a browse button.
'''
def __init__(self, table, controller):
wx.grid.PyGridCellEditor.__init__(self)
self.Table = table
self.Controller = controller
def __del__(self):
self.CellControl = None
self.Controller = None
def Create(self, parent, id, evt_handler):
self.CellControl = LocationCellControl(parent)
self.SetControl(self.CellControl)
if evt_handler:
self.CellControl.PushEventHandler(evt_handler)
def BeginEdit(self, row, col, grid):
self.CellControl.Enable()
self.CellControl.SetController(self.Controller)
self.CellControl.SetValue(self.Table.GetValueByName(row, 'Location'))
if isinstance(self.CellControl, LocationCellControl):
self.CellControl.SetVarType(self.Table.GetValueByName(row, 'Type'))
self.CellControl.SetFocus()
def EndEditInternal(self, row, col, grid, old_loc):
loc = self.CellControl.GetValue()
changed = loc != old_loc
if changed:
self.Table.SetValueByName(row, 'Location', loc)
self.Table.SetValueByName(row, 'Type', self.CellControl.GetVarType())
self.CellControl.Disable()
return changed
if wx.VERSION >= (3, 0, 0):
def EndEdit(self, row, col, grid, oldval):
return self.EndEditInternal(row, col, grid, oldval)
else:
def EndEdit(self, row, col, grid):
old_loc = self.Table.GetValueByName(row, 'Location')
return self.EndEditInternal(row, col, grid, old_loc)
def SetSize(self, rect):
self.CellControl.SetDimensions(rect.x + 1, rect.y,
rect.width, rect.height,
wx.SIZE_ALLOW_MINUS_ONE)
def Clone(self):
return LocationCellEditor(self.Table, self.Controller)