vision/src/NumericFilter.cpp

/* 
 * The contents of this file are subject to the Mozilla Public 
 * License Version 1.1 (the "License"); you may not use this file 
 * except in compliance with the License. You may obtain a copy of 
 * the License at http://www.mozilla.org/MPL/ 
 * 
 * Software distributed under the License is distributed on an "AS 
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 
 * implied. See the License for the specific language governing 
 * rights and limitations under the License. 
 * 
 * The Original Code is Vision. 
 * 
 * The Initial Developer of the Original Code is The Vision Team.
 * Portions created by The Vision Team are
 * Copyright (C) 1999, 2000, 2001 The Vision Team.  All Rights
 * Reserved.
 * 
 * Contributor(s): Rene Gollent
 *                 Wade Majors
 *                 Todd Lair
 */

#include <InterfaceDefs.h>
#include <Message.h>
#include <ctype.h>
#include "NumericFilter.h"
#include <TextView.h>
#include <Invoker.h>

#include <stdio.h>

NumericFilter::NumericFilter (void)
    : BMessageFilter (B_ANY_DELIVERY, B_ANY_SOURCE)
{
}

NumericFilter::~NumericFilter (void)
{
}

filter_result 
NumericFilter::Filter (BMessage *msg, BHandler **handler)
{
  filter_result result = B_DISPATCH_MESSAGE;
  switch (msg->what)
  {
    case B_KEY_DOWN:
    {
      uint32 modifier (msg->FindInt32 ("modifiers"));
      const char *bytes (msg->FindString ("bytes"));

      if ((modifier & B_SHIFT_KEY) == 0
        && (modifier & B_CONTROL_KEY) == 0
        && (modifier & B_OPTION_KEY) == 0
        && (modifier & B_COMMAND_KEY) == 0)
      {
        switch (bytes[0])
        {
          case B_BACKSPACE:
          case B_LEFT_ARROW:
          case B_RIGHT_ARROW:
          case B_HOME:
          case B_END:
          case B_TAB:
            break;

          case B_ENTER:
            // for some stupid reason BTextControl on R5 does not always Invoke() when
            // you hit enter, so forcing the issue here.
            if (dynamic_cast<BTextView *>(*handler))
            {
              dynamic_cast<BInvoker *>(((BView *)*handler)->Parent())->Invoke();
            }
            break;
            
          default:
            if (!isdigit(bytes[0]))
              result = B_SKIP_MESSAGE;
            break;
        }
      }
      else if ((modifier & B_SHIFT_KEY) != 0)
      {
        if (bytes[0] == B_LEFT_ARROW
        ||  bytes[0] == B_RIGHT_ARROW
        ||  bytes[0] == B_HOME
        ||  bytes[0] == B_END
        ||  bytes[0] == B_TAB)
          break;
        else
          result = B_SKIP_MESSAGE;
      }
    }
    break;
  }
  return result;
}