controls/CustomIntCtrl.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499 68f4f2d4516b
parent 1881 091005ec69c4
child 3750 f62625418bff
permissions -rw-r--r--
use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

This code could be possible reused on low-end targets with limited RAM.

code to generate lookup table:
[---------------------------------------------------------------------]

/* CRC lookup table and initial state. */
uint32_t crc32_table[256];

/* Generate CRC32 lookup table. */
void GenerateCRC32Table(void)
{
unsigned int i, j;
/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */
uint32_t poly = 0xEDB88320;

for (i = 0; i <= 0xFF; i++)
{
uint32_t c = i;
for (j = 0 ; j < 8 ; j++)
c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
crc32_table[i] = c;
}
}

void main(void)
{
GenerateCRC32Table();
int j=0;
for(int i=0; i<256; i++) {
printf("0x%08X, ", crc32_table[i]);
if (++j >= 8) {
j = 0;
printf("\n");
}
}
}
[---------------------------------------------------------------------]
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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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from __future__ import absolute_import
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import wx
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import wx.lib.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()