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      */
getTransformation(CharSequence source, View view)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      */
onFocusChanged(View view, CharSequence sourceText, boolean focused, int direction, Rect previouslyFocusedRect)42     public void onFocusChanged(View view, CharSequence sourceText,
43                                boolean focused, int direction,
44                                Rect previouslyFocusedRect);
45 }
46