/*
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* Copyright (C) 2018 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 com.android.launcher3.util;
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import android.os.SystemClock;
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/**
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* Determines whether a fling should be blocked. Currently we block flings when crossing thresholds
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* to new states, and unblock after a short duration.
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*/
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public class FlingBlockCheck {
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// Allow flinging to a new state after waiting this many milliseconds.
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private static final long UNBLOCK_FLING_PAUSE_DURATION = 200;
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private boolean mBlockFling;
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private long mBlockFlingTime;
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public void blockFling() {
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mBlockFling = true;
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mBlockFlingTime = SystemClock.uptimeMillis();
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}
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public void unblockFling() {
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mBlockFling = false;
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mBlockFlingTime = 0;
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}
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public void onEvent() {
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// We prevent flinging after passing a state, but allow it if the user pauses briefly.
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if (SystemClock.uptimeMillis() - mBlockFlingTime >= UNBLOCK_FLING_PAUSE_DURATION) {
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mBlockFling = false;
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}
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}
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public boolean isBlocked() {
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return mBlockFling;
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}
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}
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