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.grid
class CustomGrid(wx.grid.Grid):
def __init__(self, *args, **kwargs):
wx.grid.Grid.__init__(self, *args, **kwargs)
self.Editable = True
self.AddButton = None
self.DeleteButton = None
self.UpButton = None
self.DownButton = None
self.SetFont(wx.Font(12, wx.DEFAULT, wx.NORMAL, wx.NORMAL, False, 'Sans'))
self.SetLabelFont(wx.Font(10, wx.DEFAULT, wx.NORMAL, wx.NORMAL, False, 'Sans'))
self.SetSelectionBackground(wx.WHITE)
self.SetSelectionForeground(wx.BLACK)
self.DisableDragRowSize()
self.Bind(wx.grid.EVT_GRID_SELECT_CELL, self.OnSelectCell)
self.Bind(wx.grid.EVT_GRID_EDITOR_HIDDEN, self.OnEditorHidden)
self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
def SetFocus(self):
if self:
wx.grid.Grid.SetFocus(self)
def SetDefaultValue(self, default_value):
self.DefaultValue = default_value
def SetEditable(self, editable=True):
self.Editable = editable
self.RefreshButtons()
def SetButtons(self, buttons):
for name in ["Add", "Delete", "Up", "Down"]:
button = buttons.get(name, None)
setattr(self, "%sButton" % name, button)
if button is not None:
button.Bind(wx.EVT_BUTTON, getattr(self, "On%sButton" % name))
def RefreshButtons(self):
if self:
rows = self.Table.GetNumberRows()
row = self.GetGridCursorRow()
if self.AddButton is not None:
self.AddButton.Enable(self.Editable)
if self.DeleteButton is not None:
self.DeleteButton.Enable(self.Editable and rows > 0)
if self.UpButton is not None:
self.UpButton.Enable(self.Editable and row > 0)
if self.DownButton is not None:
self.DownButton.Enable(self.Editable and 0 <= row < rows - 1)
def CloseEditControl(self):
row, col = self.GetGridCursorRow(), self.GetGridCursorCol()
if row != -1 and col != -1:
self.SetGridCursor(row, col)
def AddRow(self):
self.CloseEditControl()
new_row = self.GetGridCursorRow() + 1
col = max(self.GetGridCursorCol(), 0)
if getattr(self, "_AddRow", None) is not None:
new_row = self._AddRow(new_row)
else:
self.Table.InsertRow(new_row, self.DefaultValue.copy())
self.Table.ResetView(self)
if new_row is not None:
self.SetSelectedCell(new_row, col)
def DeleteRow(self):
self.CloseEditControl()
row = self.GetGridCursorRow()
if row >= 0:
col = self.GetGridCursorCol()
if getattr(self, "_DeleteRow", None) is not None:
self._DeleteRow(row)
else:
self.Table.RemoveRow(row)
self.Table.ResetView(self)
if self.Table.GetNumberRows() > 0:
self.SetSelectedCell(min(row, self.Table.GetNumberRows() - 1), col)
def MoveRow(self, row, move):
self.CloseEditControl()
col = self.GetGridCursorCol()
if getattr(self, "_MoveRow", None) is not None:
new_row = self._MoveRow(row, move)
else:
new_row = self.Table.MoveRow(row, move)
if new_row != row:
self.Table.ResetView(self)
if new_row != row:
self.SetSelectedCell(new_row, col)
def SetSelectedCell(self, row, col):
self.SetGridCursor(row, col)
self.MakeCellVisible(row, col)
self.RefreshButtons()
def OnAddButton(self, event):
self.AddRow()
self.SetFocus()
event.Skip()
def OnDeleteButton(self, event):
self.DeleteRow()
self.SetFocus()
event.Skip()
def OnUpButton(self, event):
self.MoveRow(self.GetGridCursorRow(), -1)
self.SetFocus()
event.Skip()
def OnDownButton(self, event):
self.MoveRow(self.GetGridCursorRow(), 1)
self.SetFocus()
event.Skip()
def OnSelectCell(self, event):
wx.CallAfter(self.RefreshButtons)
event.Skip()
def OnEditorHidden(self, event):
wx.CallAfter(self.SetFocus)
event.Skip()
def OnKeyDown(self, event):
key_handled = False
keycode = event.GetKeyCode()
if keycode == wx.WXK_TAB:
row = self.GetGridCursorRow()
col = self.GetGridCursorCol()
if event.ShiftDown():
if row < 0 or col == 0:
self.Navigate(wx.NavigationKeyEvent.IsBackward)
key_handled = True
elif row < 0 or col == self.Table.GetNumberCols() - 1:
self.Navigate(wx.NavigationKeyEvent.IsForward)
key_handled = True
elif keycode in (wx.WXK_ADD, wx.WXK_NUMPAD_ADD) and self.Editable:
self.AddRow()
key_handled = True
elif keycode in (wx.WXK_DELETE, wx.WXK_NUMPAD_DELETE) and self.Editable:
self.DeleteRow()
key_handled = True
elif keycode == wx.WXK_UP and event.ShiftDown() and self.Editable:
self.MoveRow(self.GetGridCursorRow(), -1)
key_handled = True
elif keycode == wx.WXK_DOWN and event.ShiftDown() and self.Editable:
self.MoveRow(self.GetGridCursorRow(), 1)
key_handled = True
if not key_handled:
event.Skip()