| /* |
| * Copyright (C) 2017 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.systemui.recents.views; |
| |
| import android.view.animation.PathInterpolator; |
| |
| /** |
| * A helper interpolator to stagger the entrance animation in recents by offsetting the start time |
| */ |
| public class RecentsEntrancePathInterpolator extends PathInterpolator { |
| final float mStartOffsetFraction; |
| |
| /** |
| * Create an interpolator for a cubic Bezier curve with an offset play time. The end points |
| * <code>(0, 0)</code> and <code>(1, 1)</code> are assumed. |
| * |
| * @param controlX1 The x coordinate of the first control point of the cubic Bezier. |
| * @param controlY1 The y coordinate of the first control point of the cubic Bezier. |
| * @param controlX2 The x coordinate of the second control point of the cubic Bezier. |
| * @param controlY2 The y coordinate of the second control point of the cubic Bezier. |
| * @param startOffsetFraction The fraction from 0 to 1 to start the animation from |
| */ |
| public RecentsEntrancePathInterpolator(float controlX1, float controlY1, float controlX2, |
| float controlY2, float startOffsetFraction) { |
| super(controlX1, controlY1, controlX2, controlY2); |
| mStartOffsetFraction = startOffsetFraction; |
| } |
| |
| @Override |
| public float getInterpolation(float t) { |
| return super.getInterpolation(t + mStartOffsetFraction); |
| } |
| } |