106 lines
3.4 KiB
Java
106 lines
3.4 KiB
Java
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/*
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* Copyright (C) 2007 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.widget;
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import android.os.Handler;
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/**
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* Provides callbacks indicating the steps in two digit pressing within a
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* timeout.
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*
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* Package private: only relevant in helping {@link TimeSpinnerHelper}.
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*/
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class DoubleDigitManager {
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private final long timeoutInMillis;
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private final CallBack mCallBack;
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private Integer intermediateDigit;
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/**
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* @param timeoutInMillis How long after the first digit is pressed does
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* the user have to press the second digit?
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* @param callBack The callback to indicate what's going on with the user.
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*/
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public DoubleDigitManager(long timeoutInMillis, CallBack callBack) {
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this.timeoutInMillis = timeoutInMillis;
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mCallBack = callBack;
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}
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/**
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* Report to this manager that a digit was pressed.
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* @param digit
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*/
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public void reportDigit(int digit) {
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if (intermediateDigit == null) {
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intermediateDigit = digit;
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new Handler().postDelayed(new Runnable() {
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public void run() {
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if (intermediateDigit != null) {
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mCallBack.singleDigitFinal(intermediateDigit);
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intermediateDigit = null;
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}
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}
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}, timeoutInMillis);
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if (!mCallBack.singleDigitIntermediate(digit)) {
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// this wasn't a good candidate for the intermediate digit,
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// make it the final digit (since there is no opportunity to
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// reject the final digit).
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intermediateDigit = null;
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mCallBack.singleDigitFinal(digit);
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}
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} else if (mCallBack.twoDigitsFinal(intermediateDigit, digit)) {
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intermediateDigit = null;
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}
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}
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/**
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* The callback to indicate what is going on with the digits pressed.
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*/
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static interface CallBack {
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/**
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* A digit was pressed, and there are no intermediate digits.
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* @param digit The digit pressed.
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* @return Whether the digit was accepted; how the user of this manager
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* tells us that the intermediate digit is acceptable as an
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* intermediate digit.
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*/
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boolean singleDigitIntermediate(int digit);
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/**
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* A single digit was pressed, and it is 'the final answer'.
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* - a single digit pressed, and the timeout expires.
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* - a single digit pressed, and {@link #singleDigitIntermediate}
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* returned false.
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* @param digit The digit.
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*/
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void singleDigitFinal(int digit);
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/**
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* The user pressed digit1, then digit2 within the timeout.
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* @param digit1
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* @param digit2
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*/
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boolean twoDigitsFinal(int digit1, int digit2);
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}
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}
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