The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.text; |
| 18 | |
| 19 | /** |
| 20 | * When an object of a type is attached to an Editable, its methods will |
| 21 | * be called when the text is changed. |
| 22 | */ |
| 23 | public interface TextWatcher extends NoCopySpan { |
| 24 | /** |
| 25 | * This method is called to notify you that, within <code>s</code>, |
| 26 | * the <code>count</code> characters beginning at <code>start</code> |
| 27 | * are about to be replaced by new text with length <code>after</code>. |
| 28 | * It is an error to attempt to make changes to <code>s</code> from |
| 29 | * this callback. |
| 30 | */ |
| 31 | public void beforeTextChanged(CharSequence s, int start, |
| 32 | int count, int after); |
| 33 | /** |
| 34 | * This method is called to notify you that, within <code>s</code>, |
| 35 | * the <code>count</code> characters beginning at <code>start</code> |
| 36 | * have just replaced old text that had length <code>before</code>. |
| 37 | * It is an error to attempt to make changes to <code>s</code> from |
| 38 | * this callback. |
| 39 | */ |
| 40 | public void onTextChanged(CharSequence s, int start, int before, int count); |
| 41 | |
| 42 | /** |
| 43 | * This method is called to notify you that, somewhere within |
| 44 | * <code>s</code>, the text has been changed. |
| 45 | * It is legitimate to make further changes to <code>s</code> from |
| 46 | * this callback, but be careful not to get yourself into an infinite |
| 47 | * loop, because any changes you make will cause this method to be |
| 48 | * called again recursively. |
| 49 | * (You are not told where the change took place because other |
| 50 | * afterTextChanged() methods may already have made other changes |
| 51 | * and invalidated the offsets. But if you need to know here, |
| 52 | * you can use {@link Spannable#setSpan} in {@link #onTextChanged} |
| 53 | * to mark your place and then look up from here where the span |
| 54 | * ended up. |
| 55 | */ |
| 56 | public void afterTextChanged(Editable s); |
| 57 | } |