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 17package android.text.method; 18 19import android.graphics.Rect; 20import android.view.View; 21import android.widget.TextView; 22 23/** 24 * TextView uses TransformationMethods to do things like replacing the 25 * characters of passwords with dots, or keeping the newline characters 26 * from causing line breaks in single-line text fields. 27 */ 28public interface TransformationMethod 29{ 30 /** 31 * Returns a CharSequence that is a transformation of the source text -- 32 * for example, replacing each character with a dot in a password field. 33 * Beware that the returned text must be exactly the same length as 34 * the source text, and that if the source text is Editable, the returned 35 * text must mirror it dynamically instead of doing a one-time copy. 36 */ 37 public CharSequence getTransformation(CharSequence source, View view); 38 39 /** 40 * This method is called when the TextView that uses this 41 * TransformationMethod gains or loses focus. 42 */ 43 public void onFocusChanged(View view, CharSequence sourceText, 44 boolean focused, int direction, 45 Rect previouslyFocusedRect); 46} 47