TextCtrlAutoComplete.py
author laurent
Thu, 08 Oct 2009 12:36:55 +0200
changeset 412 2b9bc5ee30c0
parent 326 386566f263f3
child 426 3f285782ac9b
permissions -rw-r--r--
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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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ITEM_HEIGHT = 25
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class TextCtrlAutoComplete(wx.TextCtrl):
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    def __init__ (self, parent, 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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        #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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        #widgets
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        self.dropdown = wx.PopupWindow(self)
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        #Control the style
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        flags = wx.LB_HSCROLL | wx.LB_SINGLE | wx.LB_SORT
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        #Create the list and bind the events
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        self.dropdownlistbox = wx.ListBox(self.dropdown, style=flags,
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                                 pos=wx.Point(0, 0))
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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, self)
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        self.Bind(wx.EVT_TEXT_ENTER, self.onControlChanged, self)
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        self.Bind(wx.EVT_TEXT, self.onEnteredText, self)
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        self.Bind(wx.EVT_KEY_DOWN, self.onKeyDown, self)
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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, self)
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            self.Bind(wx.EVT_LEFT_UP , self.onClickToggleUp, self)
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        self.dropdownlistbox.Bind(wx.EVT_LISTBOX, self.onListItemSelected)
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        self.dropdownlistbox.Bind(wx.EVT_LISTBOX_DCLICK, self.onListItemSelected)
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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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        visible = self.dropdown.IsShown()
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        keycode = event.GetKeyCode()
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        if keycode in [wx.WXK_DOWN, wx.WXK_UP]:
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            if not visible:
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                self._showDropDown()
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            elif keycode == wx.WXK_DOWN:
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                self._moveSelection(1)
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            else:
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                self._moveSelection(-1)
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        elif keycode in [wx.WXK_LEFT, wx.WXK_RIGHT, wx.WXK_RETURN] and visible:
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            if self.dropdownlistbox.GetSelection() != wx.NOT_FOUND:
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                self._setValueFromSelected()
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            else:
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                self._showDropDown(False)
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                event.Skip()
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        elif event.GetKeyCode() == wx.WXK_ESCAPE:
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            self._showDropDown(False)
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        else:
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            event.Skip()
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    def onListItemSelected(self, event):
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        self._setValueFromSelected()
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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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            self._showDropDown(not self.dropdown.IsShown())
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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._showDropDown(False)
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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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#-------------------------------------------------------------------------------
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#                           Internal methods
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#-------------------------------------------------------------------------------
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    def _refreshListBoxChoices(self):
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        text = self.GetValue()
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        self.dropdownlistbox.Clear()
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        for choice in self._choices:
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            if choice.startswith(text):
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                self.dropdownlistbox.Append(choice)
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        itemcount = min(len(self.dropdownlistbox.GetStrings()), MAX_ITEM_SHOWN)
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        self.popupsize = wx.Size(self.GetSize()[0], ITEM_HEIGHT * itemcount + 4)
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        self.dropdownlistbox.SetSize(self.popupsize)
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        self.dropdown.SetClientSize(self.popupsize)
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    def _moveSelection(self, direction):
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        selected = self.dropdownlistbox.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.dropdownlistbox.GetCount() - 1
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        else:
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            selected = (selected + direction) % (self.dropdownlistbox.GetCount() + 1)
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        if selected == self.dropdownlistbox.GetCount():
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            selected = wx.NOT_FOUND
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        self.dropdownlistbox.SetSelection(selected)
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    def _setValueFromSelected(self):
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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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         selected = self.dropdownlistbox.GetStringSelection()
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         if selected:
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            self.SetValue(selected)
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            self._showDropDown(False)
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    def _showDropDown(self, show=True) :
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        """
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        Either display the drop down list (show = True) or hide it (show = False).
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        """
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        if show :
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            size = self.dropdown.GetSize()
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            width, height = self.GetSizeTuple()
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            x, y = self.ClientToScreenXY(0, height)
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            if size.GetWidth() != width :
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                size.SetWidth(width)
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                self.dropdown.SetSize(size)
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                self.dropdownlistbox.SetSize(self.dropdown.GetClientSize())
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            if (y + size.GetHeight()) < self._screenheight :
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                self.dropdown.SetPosition(wx.Point(x, y))
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            else:
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                self.dropdown.SetPosition(wx.Point(x, y - height - size.GetHeight()))
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        self.dropdown.Show(show) 
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