/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.text.method;
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import android.graphics.Rect;
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import android.view.View;
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/**
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* TextView uses TransformationMethods to do things like replacing the
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* characters of passwords with dots, or keeping the newline characters
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* from causing line breaks in single-line text fields.
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*/
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public interface TransformationMethod
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{
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/**
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* Returns a CharSequence that is a transformation of the source text --
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* for example, replacing each character with a dot in a password field.
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* Beware that the returned text must be exactly the same length as
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* the source text, and that if the source text is Editable, the returned
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* text must mirror it dynamically instead of doing a one-time copy.
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* The method should not return {@code null} unless {@code source}
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* is {@code null}.
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*/
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public CharSequence getTransformation(CharSequence source, View view);
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/**
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* This method is called when the TextView that uses this
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* TransformationMethod gains or loses focus.
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*/
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public void onFocusChanged(View view, CharSequence sourceText,
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boolean focused, int direction,
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Rect previouslyFocusedRect);
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}
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