Android Open Source - pokerCCF Max Length Text Watcher

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The source code is released under:

Copyright (c) 2011-2014, Intel Corporation Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redist...

Java Source Code

//******************************************************************
////  ww  w . ja v  a  2s .co  m
// Copyright (c) 2011-2013, Intel Corporation
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//    * Redistributions of source code must retain the above copyright notice,
//      this list of conditions and the following disclaimer.
//
//    * Redistributions in binary form must reproduce the above copyright notice,
//      this list of conditions and the following disclaimer in the documentation
//      and/or other materials provided with the distribution.
//
//    * Neither the name of Intel Corporation nor the names of its contributors
//      may be used to endorse or promote products derived from this software
//      without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//
//
//******************************************************************
// File name:       
//     MaxLengthTextWatcher.java
//
// Description:     
//     
//
// Author:          
//     kmmillix
//
// Review History:  
//     
//
//*********************************************************************
package com.intel.inproclib.utility;

import android.os.Handler;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;

/**
 * @author kmmillix
 * 
 */
public class MaxLengthTextWatcher implements TextWatcher
{
  private final int    maxLength;
  private final EditText  editBox;
  private final Handler  handler  = new Handler();

  private int        newStart, newCount;

  public MaxLengthTextWatcher(int maxLength, EditText editBox) {
    this.maxLength = maxLength;
    this.editBox = editBox;
  }

  @Override
  public void beforeTextChanged(CharSequence s, int start, int count, int after)
  {
  }

  @Override
  public void onTextChanged(CharSequence s, int start, int before, int count)
  {
    newStart = start;
    newCount = count;
  }

  @Override
  public void afterTextChanged(final Editable s)
  {
    String l = s.toString();

    l = l.replace('\n', ' ');
    if (l.compareTo(s.toString()) != 0)
    {
      s.clear();
      s.append(l);
    }

    if (l.length() > maxLength)
    {
      if (editBox != null)
      {
        final int diff = l.length() - maxLength;
        handler.post(new Runnable() {
          @Override
          public void run()
          {
            int sel = editBox.getSelectionStart() - 1;
            if (sel < 0)
              sel = 0;

            String newString = new String();
            if (newStart != 0)
            {
              newString += s.subSequence(0, newStart);
            }
            newString += s.subSequence(newStart, (newStart + newCount) - diff);
            newString += s.subSequence(newStart + newCount, s.length());

            editBox.setText(newString);
            editBox.setSelection(Math.min(sel, editBox.getText().length()));
          }
        });
      }
    }
  }
}

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