58 lines
2.4 KiB
Java
58 lines
2.4 KiB
Java
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/*
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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;
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/**
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* When an object of a type is attached to an Editable, its methods will
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* be called when the text is changed.
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*/
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public interface TextWatcher extends NoCopySpan {
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/**
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* This method is called to notify you that, within <code>s</code>,
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* the <code>count</code> characters beginning at <code>start</code>
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* are about to be replaced by new text with length <code>after</code>.
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* It is an error to attempt to make changes to <code>s</code> from
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* this callback.
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*/
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public void beforeTextChanged(CharSequence s, int start,
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int count, int after);
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/**
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* This method is called to notify you that, within <code>s</code>,
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* the <code>count</code> characters beginning at <code>start</code>
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* have just replaced old text that had length <code>before</code>.
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* It is an error to attempt to make changes to <code>s</code> from
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* this callback.
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*/
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public void onTextChanged(CharSequence s, int start, int before, int count);
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/**
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* This method is called to notify you that, somewhere within
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* <code>s</code>, the text has been changed.
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* It is legitimate to make further changes to <code>s</code> from
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* this callback, but be careful not to get yourself into an infinite
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* loop, because any changes you make will cause this method to be
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* called again recursively.
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* (You are not told where the change took place because other
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* afterTextChanged() methods may already have made other changes
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* and invalidated the offsets. But if you need to know here,
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* you can use {@link Spannable#setSpan} in {@link #onTextChanged}
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* to mark your place and then look up from here where the span
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* ended up.
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*/
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public void afterTextChanged(Editable s);
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}
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