controls/LocationCellEditor.py
author Laurent Bessard
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Added example of SFC simulating traffic lights
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
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#based on the plcopen standard. 
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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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from dialogs.BrowseLocationsDialog import BrowseLocationsDialog
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class LocationCellControl(wx.PyControl):
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    '''
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    Custom cell editor control with a text box and a button that launches
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    the BrowseLocationsDialog.
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    '''
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    def __init__(self, parent):
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        wx.Control.__init__(self, parent)
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        main_sizer = wx.FlexGridSizer(cols=2, hgap=0, rows=1, vgap=0)
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        main_sizer.AddGrowableCol(0)
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        main_sizer.AddGrowableRow(0)
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        # create location text control
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        self.Location = wx.TextCtrl(self, size=wx.Size(0, -1), 
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              style=wx.TE_PROCESS_ENTER)
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        self.Location.Bind(wx.EVT_KEY_DOWN, self.OnLocationChar)
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        main_sizer.AddWindow(self.Location, flag=wx.GROW)
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        # create browse button
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        self.BrowseButton = wx.Button(self, label='...', size=wx.Size(30, -1))
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        self.BrowseButton.Bind(wx.EVT_BUTTON, self.OnBrowseButtonClick)
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        main_sizer.AddWindow(self.BrowseButton, flag=wx.GROW)
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        self.Bind(wx.EVT_SIZE, self.OnSize)
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        self.SetSizer(main_sizer)
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        self.Controller = None
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        self.VarType = None
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        self.Default = False
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    def __del__(self):
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        self.Controller = None
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    def SetController(self, controller):
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        self.Controller = controller
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    def SetVarType(self, vartype):
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        self.VarType = vartype
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    def GetVarType(self):
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        return self.VarType
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    def SetValue(self, value):
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        self.Default = value
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        self.Location.SetValue(value)
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    def GetValue(self):
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        return self.Location.GetValue()
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    def OnSize(self, event):
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        self.Layout()
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    def OnBrowseButtonClick(self, event):
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        # pop up the location browser dialog
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        dialog = BrowseLocationsDialog(self, self.VarType, self.Controller)
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        if dialog.ShowModal() == wx.ID_OK:
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            infos = dialog.GetValues()
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        else:
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            infos = None
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        dialog.Destroy()
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        if infos is not None:
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            location = infos["location"]
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            # set the location
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            if not infos["location"].startswith("%"):
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                dialog = wx.SingleChoiceDialog(self, 
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                      _("Select a variable class:"), _("Variable class"), 
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                      ["Input", "Output", "Memory"], 
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                      wx.DEFAULT_DIALOG_STYLE|wx.OK|wx.CANCEL)
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                if dialog.ShowModal() == wx.ID_OK:
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                    selected = dialog.GetSelection()
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                else:
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                    selected = None
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                dialog.Destroy()
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                if selected is None:
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                    self.Location.SetFocus()
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                    return
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                if selected == 0:
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                    location = "%I" + location
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                elif selected == 1:
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                    location = "%Q" + location
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                else:
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                    location = "%M" + location
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            self.Location.SetValue(location)
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            self.VarType = infos["IEC_type"]
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        self.Location.SetFocus()
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    def OnLocationChar(self, event):
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        keycode = event.GetKeyCode()
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        if keycode in [wx.WXK_RETURN, wx.WXK_TAB]:
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            self.Parent.Parent.ProcessEvent(event)
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        elif keycode == wx.WXK_ESCAPE:
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            self.Location.SetValue(self.Default)
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            self.Parent.Parent.CloseEditControl()
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        else:
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            event.Skip()
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    def SetInsertionPoint(self, i):
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        self.Location.SetInsertionPoint(i)
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    def SetFocus(self):
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        self.Location.SetFocus()
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class LocationCellEditor(wx.grid.PyGridCellEditor):
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    '''
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    Grid cell editor that uses LocationCellControl to display a browse button.
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    '''
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    def __init__(self, table, controller):
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        wx.grid.PyGridCellEditor.__init__(self)
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        self.Table = table
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        self.Controller = controller
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    def __del__(self):
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        self.CellControl = None
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        self.Controller = None
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    def Create(self, parent, id, evt_handler):
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        self.CellControl = LocationCellControl(parent)
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        self.SetControl(self.CellControl)
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        if evt_handler:
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            self.CellControl.PushEventHandler(evt_handler)
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    def BeginEdit(self, row, col, grid):
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        self.CellControl.Enable()
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        self.CellControl.SetController(self.Controller)
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        self.CellControl.SetValue(self.Table.GetValueByName(row, 'Location'))
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        if isinstance(self.CellControl, LocationCellControl):
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            self.CellControl.SetVarType(self.Table.GetValueByName(row, 'Type'))
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        self.CellControl.SetFocus()
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    def EndEdit(self, row, col, grid):
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        loc = self.CellControl.GetValue()
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        old_loc = self.Table.GetValueByName(row, 'Location')
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        changed = loc != old_loc
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        if changed:
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            self.Table.SetValueByName(row, 'Location', loc)
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            self.Table.SetValueByName(row, 'Type', self.CellControl.GetVarType())
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        self.CellControl.Disable()
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        return changed
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    def SetSize(self, rect):
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        self.CellControl.SetDimensions(rect.x + 1, rect.y,
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                                        rect.width, rect.height,
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                                        wx.SIZE_ALLOW_MINUS_ONE)
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    def Clone(self):
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        return LocationCellEditor(self.Table, self.Controller)
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