TextCtrlAutoComplete.py
author ed
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#This file is part of Beremiz, a Integrated Development Environment for
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#programming IEC 61131-3 automates supporting plcopen standard and CanFestival. 
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#
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#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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#
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#See COPYING file for copyrights details.
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#
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#This library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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#General Public License for more details.
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#
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#You should have received a copy of the GNU General Public
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import wx
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import cPickle
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MAX_ITEM_COUNT = 10
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MAX_ITEM_SHOWN = 6
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if wx.Platform == '__WXMSW__':
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    ITEM_INTERVAL_HEIGHT = 3
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else:
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    ITEM_INTERVAL_HEIGHT = 6
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if wx.Platform == '__WXMSW__':
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    popupclass = wx.PopupTransientWindow
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else:
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    popupclass = wx.PopupWindow
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class PopupWithListbox(popupclass):
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    def __init__(self, parent, choices=[]):
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        popupclass.__init__(self, parent, wx.SIMPLE_BORDER)
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        self.ListBox = wx.ListBox(self, -1, style=wx.LB_HSCROLL|wx.LB_SINGLE|wx.LB_SORT)
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        if not wx.Platform == '__WXMSW__':
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            self.ListBox.Bind(wx.EVT_LISTBOX, self.OnListBoxClick)
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            self.ListBox.Bind(wx.EVT_LISTBOX_DCLICK, self.OnListBoxClick)
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        self.SetChoices(choices)
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        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
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    def SetChoices(self, choices):
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        max_text_width = 0
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        max_text_height = 0
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        self.ListBox.Clear()
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        for choice in choices:
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            self.ListBox.Append(choice)
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            w, h = self.ListBox.GetTextExtent(choice)
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            max_text_width = max(max_text_width, w)
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            max_text_height = max(max_text_height, h)
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        itemcount = min(len(choices), MAX_ITEM_SHOWN)
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        width = self.Parent.GetSize()[0]
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        height = max_text_height * itemcount + ITEM_INTERVAL_HEIGHT * (itemcount + 1)
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        if max_text_width + 10 > width:
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            height += 15
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        size = wx.Size(width, height)
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        self.ListBox.SetSize(size)
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        self.SetClientSize(size)
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    def MoveSelection(self, direction):
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        selected = self.ListBox.GetSelection()
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        if selected == wx.NOT_FOUND:
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            if direction >= 0:
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                selected = 0
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            else:
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                selected = self.ListBox.GetCount() - 1
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        else:
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            selected = (selected + direction) % (self.ListBox.GetCount() + 1)
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        if selected == self.ListBox.GetCount():
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            selected = wx.NOT_FOUND
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        self.ListBox.SetSelection(selected)
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    def GetSelection(self):
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        return self.ListBox.GetStringSelection()
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    def ProcessLeftDown(self, event):
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        selected = self.ListBox.HitTest(wx.Point(event.m_x, event.m_y))
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        if selected != wx.NOT_FOUND:
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            wx.CallAfter(self.Parent.SetValueFromSelected, self.ListBox.GetString(selected))
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        return False
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    def OnListBoxClick(self, event):
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        selected = event.GetSelection()
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        if selected != wx.NOT_FOUND:
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            wx.CallAfter(self.Parent.SetValueFromSelected, self.ListBox.GetString(selected))
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        event.Skip()
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    def OnKeyDown(self, event):
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        self.Parent.ProcessEvent(event)
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    def OnDismiss(self):
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        self.Parent.listbox = None
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        wx.CallAfter(self.Parent.DismissListBox)
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class TextCtrlAutoComplete(wx.TextCtrl):
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    def __init__ (self, parent, appframe, choices=None, dropDownClick=True,
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                  element_path=None, **therest):
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        """
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        Constructor works just like wx.TextCtrl except you can pass in a
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        list of choices.  You can also change the choice list at any time
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        by calling setChoices.
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        """
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        therest['style'] = wx.TE_PROCESS_ENTER | therest.get('style', 0)
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        wx.TextCtrl.__init__(self, parent, **therest)
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        self.AppFrame = appframe
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        #Some variables
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        self._dropDownClick = dropDownClick
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        self._lastinsertionpoint = None
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        self._screenheight = wx.SystemSettings.GetMetric(wx.SYS_SCREEN_Y)
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        self.element_path = element_path
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        self.listbox = None
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        self.SetChoices(choices)
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        #gp = self
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        #while ( gp != None ) :
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        #    gp.Bind ( wx.EVT_MOVE , self.onControlChanged, gp )
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        #    gp.Bind ( wx.EVT_SIZE , self.onControlChanged, gp )
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        #    gp = gp.GetParent()
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        self.Bind(wx.EVT_KILL_FOCUS, self.OnControlChanged)
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        self.Bind(wx.EVT_TEXT_ENTER, self.OnControlChanged)
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        self.Bind(wx.EVT_TEXT, self.OnEnteredText)
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        self.Bind(wx.EVT_KEY_DOWN, self.OnKeyDown)
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        #If need drop down on left click
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        if dropDownClick:
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            self.Bind(wx.EVT_LEFT_DOWN, self.OnClickToggleDown)
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            self.Bind(wx.EVT_LEFT_UP, self.OnClickToggleUp)
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    def __del__(self):
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        self.AppFrame = None
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    def ChangeValue(self, value):
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        wx.TextCtrl.ChangeValue(self, value)
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        self.RefreshListBoxChoices()
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    def OnEnteredText(self, event):
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        wx.CallAfter(self.RefreshListBoxChoices)
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        event.Skip()
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    def OnKeyDown(self, event):
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        """ Do some work when the user press on the keys:
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            up and down: move the cursor
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        """
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        keycode = event.GetKeyCode()
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        if keycode in [wx.WXK_DOWN, wx.WXK_UP]:
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            self.PopupListBox()
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            if keycode == wx.WXK_DOWN:
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                self.listbox.MoveSelection(1)
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            else:
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                self.listbox.MoveSelection(-1)
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        elif keycode in [wx.WXK_LEFT, wx.WXK_RIGHT, wx.WXK_RETURN] and self.listbox is not None:
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            self.SetValueFromSelected(self.listbox.GetSelection())
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        elif event.GetKeyCode() == wx.WXK_ESCAPE:
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            self.DismissListBox()
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        else:
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            event.Skip()
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    def OnClickToggleDown(self, event):
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        self._lastinsertionpoint = self.GetInsertionPoint()
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        event.Skip()
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    def OnClickToggleUp(self, event):
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        if self.GetInsertionPoint() == self._lastinsertionpoint:
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            wx.CallAfter(self.PopupListBox)
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        self._lastinsertionpoint = None
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        event.Skip()
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    def OnControlChanged(self, event):
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        res = self.GetValue()
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        config = wx.ConfigBase.Get()
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        listentries = cPickle.loads(str(config.Read(self.element_path, cPickle.dumps([]))))
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        if res and res not in listentries:
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            listentries = (listentries + [res])[-MAX_ITEM_COUNT:]
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            config.Write(self.element_path, cPickle.dumps(listentries))
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            config.Flush()
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            self.SetChoices(listentries)
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        self.DismissListBox()
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        event.Skip()
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    def SetChoices(self, choices):
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        self._choices = choices
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        self.RefreshListBoxChoices()
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    def GetChoices(self):
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        return self._choices
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    def SetValueFromSelected(self, selected):
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         """
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         Sets the wx.TextCtrl value from the selected wx.ListCtrl item.
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         Will do nothing if no item is selected in the wx.ListCtrl.
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         """
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         if selected != "":
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            self.SetValue(selected)
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         self.DismissListBox()
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    def RefreshListBoxChoices(self):
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        if self.listbox is not None:
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            text = self.GetValue()
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            choices = [choice for choice in self._choices if choice.startswith(text)]
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            self.listbox.SetChoices(choices)
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    def PopupListBox(self):
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        if self.listbox is None:
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            self.listbox = PopupWithListbox(self)
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            # Show the popup right below or above the button
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            # depending on available screen space...
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            pos = self.ClientToScreen((0, 0))
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            sz = self.GetSize()
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            self.listbox.Position(pos, (0, sz[1]))
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            self.RefreshListBoxChoices()
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            if wx.Platform == '__WXMSW__':
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                self.listbox.Popup()
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            else:
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                self.listbox.Show()
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            self.AppFrame.EnableScrolling(False)
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    def DismissListBox(self):
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        if self.listbox is not None:
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            if wx.Platform == '__WXMSW__':
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                self.listbox.Dismiss()
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            else:
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                self.listbox.Destroy()
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            self.listbox = None
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        self.AppFrame.EnableScrolling(True)
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