content: /*
   * Copyright (C) 2018 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.android.launcher3.util;
  
  import android.os.SystemClock;
  
  /**
   * Determines whether a fling should be blocked. Currently we block flings when crossing thresholds
   * to new states, and unblock after a short duration.
   */
  public class FlingBlockCheck {
      // Allow flinging to a new state after waiting this many milliseconds.
      private static final long UNBLOCK_FLING_PAUSE_DURATION = 200;
  
      private boolean mBlockFling;
      private long mBlockFlingTime;
  
      public void blockFling() {
          mBlockFling = true;
          mBlockFlingTime = SystemClock.uptimeMillis();
      }
  
      public void unblockFling() {
          mBlockFling = false;
          mBlockFlingTime = 0;
      }
  
      public void onEvent() {
          // We prevent flinging after passing a state, but allow it if the user pauses briefly.
          if (SystemClock.uptimeMillis() - mBlockFlingTime >= UNBLOCK_FLING_PAUSE_DURATION) {
              mBlockFling = false;
          }
      }
  
      public boolean isBlocked() {
          return mBlockFling;
      }
  }
  