content: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.text;
  
  /**
   * When an object of this type is attached to an Editable, its methods will
   * be called when the text is changed.
   */
  public interface TextWatcher extends NoCopySpan {
      /**
       * This method is called to notify you that, within <code>s</code>,
       * the <code>count</code> characters beginning at <code>start</code>
       * are about to be replaced by new text with length <code>after</code>.
       * It is an error to attempt to make changes to <code>s</code> from
       * this callback.
       */
      public void beforeTextChanged(CharSequence s, int start,
                                    int count, int after);
      /**
       * This method is called to notify you that, within <code>s</code>,
       * the <code>count</code> characters beginning at <code>start</code>
       * have just replaced old text that had length <code>before</code>.
       * It is an error to attempt to make changes to <code>s</code> from
       * this callback.
       */
      public void onTextChanged(CharSequence s, int start, int before, int count);
  
      /**
       * This method is called to notify you that, somewhere within
       * <code>s</code>, the text has been changed.
       * It is legitimate to make further changes to <code>s</code> from
       * this callback, but be careful not to get yourself into an infinite
       * loop, because any changes you make will cause this method to be
       * called again recursively.
       * (You are not told where the change took place because other
       * afterTextChanged() methods may already have made other changes
       * and invalidated the offsets.  But if you need to know here,
       * you can use {@link Spannable#setSpan} in {@link #onTextChanged}
       * to mark your place and then look up from here where the span
       * ended up.
       */
      public void afterTextChanged(Editable s);
  }
  