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

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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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from __future__ import absolute_import
import wx
from zope.interface import Interface, Attribute
from zope.interface.verify import verifyObject
from connectors import connectors_dialog, ConnectorDialog, GetConnectorFromURI
[ID_URIWIZARDDIALOG, ID_URITYPECHOICE] = [wx.NewId() for _init_ctrls in range(2)]
class IConnectorPanel(Interface):
"""This is interface for panel of seperate connector type"""
uri = Attribute("""uri of connections""")
type = Attribute("""type of connector""")
def SetURI(uri): # pylint: disable=no-self-argument
"""methode for set uri"""
def GetURI(): # pylint: disable=no-self-argument
"""metohde for get uri"""
class UriLocationEditor(wx.Dialog):
def _init_ctrls(self, parent):
self.UriTypeChoice = wx.Choice(parent=self, id=ID_URIWIZARDDIALOG, choices=self.URITYPES)
self.UriTypeChoice.SetSelection(0)
self.Bind(wx.EVT_CHOICE, self.OnTypeChoice, self.UriTypeChoice)
self.PanelSizer = wx.BoxSizer(wx.HORIZONTAL)
self.ButtonSizer = self.CreateButtonSizer(wx.OK | wx.CANCEL)
def _init_sizers(self):
self.mainSizer = wx.BoxSizer(wx.VERTICAL)
typeSizer = wx.BoxSizer(wx.HORIZONTAL)
typeSizer.Add(wx.StaticText(self, wx.ID_ANY, _("URI type:")), border=5, flag=wx.ALIGN_CENTER_VERTICAL | wx.ALL)
typeSizer.Add(self.UriTypeChoice, border=5, flag=wx.ALL)
self.mainSizer.Add(typeSizer)
self.mainSizer.Add(self.PanelSizer, border=5, flag=wx.ALL)
self.mainSizer.Add(self.ButtonSizer, border=5, flag=wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)
self.SetSizer(self.mainSizer)
self.Layout()
self.Fit()
def __init__(self, parent, uri):
wx.Dialog.__init__(self, id=ID_URIWIZARDDIALOG,
name='UriLocationEditor', parent=parent,
title='Uri location')
self.URITYPES = [_("- Select URI type -")]
for connector_type, connector_function in connectors_dialog.iteritems():
try:
connector_function['function']()
self.URITYPES.append(connector_type)
except Exception:
pass
self.selected = None
self.parrent = parent
self.logger = self.parrent.CTR.logger
self._init_ctrls(parent)
self._init_sizers()
self.SetURI(uri)
self.CenterOnParent()
def OnTypeChoice(self, event):
self._removePanelType()
index = event.GetSelection()
if index > 0:
self.selected = event.GetString()
self.panelType = self._getConnectorDialog(self.selected)
if self.panelType:
self.PanelSizer.Add(self.panelType)
self.mainSizer.Layout()
self.Fit()
self.panelType.Refresh()
def SetURI(self, uri):
self._removePanelType()
uri_list = uri.strip().split(":")
if uri_list:
uri_type = uri_list[0].upper()
type = GetConnectorFromURI(uri_type)
if type:
self.selected = type
self.UriTypeChoice.SetStringSelection(self.selected)
self.panelType = self._getConnectorDialog(self.selected)
if self.panelType:
self.panelType.SetURI(uri)
self.PanelSizer.Add(self.panelType)
self.PanelSizer.Layout()
self.mainSizer.Layout()
self.Fit()
self.panelType.Refresh()
def GetURI(self):
if not self.selected or not self.panelType:
return ""
else:
return self.panelType.GetURI()
def _removePanelType(self):
for i in range(self.PanelSizer.GetItemCount()):
item = self.PanelSizer.GetItem(i)
item.DeleteWindows()
self.PanelSizer.Remove(i)
self.Fit()
self.PanelSizer.Layout()
def _getConnectorDialog(self, connectorType):
connector = ConnectorDialog(connectorType, self)
if connector and IConnectorPanel.providedBy(connector):
if verifyObject(IConnectorPanel, connector):
return connector
else:
return None