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.method; 18 19 import android.graphics.Rect; 20 import android.view.View; 21 22 /** 23 * TextView uses TransformationMethods to do things like replacing the 24 * characters of passwords with dots, or keeping the newline characters 25 * from causing line breaks in single-line text fields. 26 */ 27 public interface TransformationMethod 28 { 29 /** 30 * Returns a CharSequence that is a transformation of the source text -- 31 * for example, replacing each character with a dot in a password field. 32 * Beware that the returned text must be exactly the same length as 33 * the source text, and that if the source text is Editable, the returned 34 * text must mirror it dynamically instead of doing a one-time copy. 35 */ 36 public CharSequence getTransformation(CharSequence source, View view); 37 38 /** 39 * This method is called when the TextView that uses this 40 * TransformationMethod gains or loses focus. 41 */ 42 public void onFocusChanged(View view, CharSequence sourceText, 43 boolean focused, int direction, 44 Rect previouslyFocusedRect); 45 } 46
