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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) 2017: Andrey Skvortsov

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#

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# See COPYING file for copyrights details.

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#

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# This program is free software; you can redistribute it and/or

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# modify it under the terms of the GNU General Public License

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# as published by the Free Software Foundation; either version 2

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# of the License, or (at your option) any later version.

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#

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# This program 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

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# GNU 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 License

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# along with this program; if not, write to the Free Software

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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

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import wx

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from wx.lib.intctrl import IntCtrl

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class CustomIntUpdatedEvent(wx.PyCommandEvent):

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    def __init__(self, id, value=0, object=None):

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        wx.PyCommandEvent.__init__(self, CustomIntCtrl.wxEVT_COMMAND_CUSTOM_INT_UPDATED, id)

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        self.__value = value

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        self.SetEventObject(object)

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    def GetValue(self):

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        """Retrieve the value of the control at the time

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        this event was generated."""

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        return self.__value

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class CustomIntCtrl(wx.lib.intctrl.IntCtrl):

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    """

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    This class provides a control that takes and returns long as

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    value, and provides bounds support and optional value limiting.

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    It handles entering negative numbers more user-friendly than

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    original wx.lib.intctrl.IntCtrl.

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    It applies limits as focus is changed to other control and

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    sends event afterwards to signal that editing is done.

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    """

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    # Used to trap events indicating that the current

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    # integer value of the control has been changed.

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    wxEVT_COMMAND_CUSTOM_INT_UPDATED = wx.NewEventType()

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    EVT_CUSTOM_INT = wx.PyEventBinder(wxEVT_COMMAND_CUSTOM_INT_UPDATED, 1)

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    def __init__(self, *args, **kwargs):

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        wx.lib.intctrl.IntCtrl.__init__(self, *args, **kwargs)

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        self.Bind(wx.EVT_KILL_FOCUS, self.UpdateValue)

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        self.SetLongAllowed(True)

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        self.SetLimited(False)

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    def GetValue(self):

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        """

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        Returns integer (long) value of the control,

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        but handles entering negative numbers

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        """

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        s = wx.TextCtrl.GetValue(self)

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        if s == '-':

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            s = ''

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        return self._fromGUI(s)

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    def GetValueStr(self):

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        """Returns string value of TextCtrl"""

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        return wx.TextCtrl.GetValue(self)

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    def UpdateValue(self, event):

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        self.SetLimited(True)

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        self.SetLimited(False)

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        try:

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            self.GetEventHandler().ProcessEvent(

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                CustomIntUpdatedEvent(self.GetId(), self.GetValue(), self))

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        except ValueError:

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            return

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        event.Skip()