1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.launcher3; 18 19 /** 20 * Keeps track of when thresholds are passed during a pinch gesture, 21 * used to inform {@link PinchAnimationManager} throughout. 22 * 23 * @see PinchToOverviewListener 24 * @see PinchAnimationManager 25 */ 26 public class PinchThresholdManager { 27 public static final float THRESHOLD_ZERO = 0.0f; 28 public static final float THRESHOLD_ONE = 0.40f; 29 public static final float THRESHOLD_TWO = 0.70f; 30 public static final float THRESHOLD_THREE = 0.95f; 31 32 private Workspace mWorkspace; 33 34 private float mPassedThreshold = THRESHOLD_ZERO; 35 PinchThresholdManager(Workspace workspace)36 public PinchThresholdManager(Workspace workspace) { 37 mWorkspace = workspace; 38 } 39 40 /** 41 * Uses the pinch progress to determine whether a threshold has been passed, 42 * and asks the {@param animationManager} to animate if so. 43 * @param progress From 0 to 1, where 0 is overview and 1 is workspace. 44 * @param animationManager Animates the threshold change if one is passed. 45 * @return The last passed threshold, one of 46 * {@link PinchThresholdManager#THRESHOLD_ZERO}, 47 * {@link PinchThresholdManager#THRESHOLD_ONE}, 48 * {@link PinchThresholdManager#THRESHOLD_TWO}, or 49 * {@link PinchThresholdManager#THRESHOLD_THREE} 50 */ updateAndAnimatePassedThreshold(float progress, PinchAnimationManager animationManager)51 public float updateAndAnimatePassedThreshold(float progress, 52 PinchAnimationManager animationManager) { 53 if (!mWorkspace.isInOverviewMode()) { 54 // Invert the progress, because going from workspace to overview is 1 to 0. 55 progress = 1f - progress; 56 } 57 58 float previousPassedThreshold = mPassedThreshold; 59 60 if (progress < THRESHOLD_ONE) { 61 mPassedThreshold = THRESHOLD_ZERO; 62 } else if (progress < THRESHOLD_TWO) { 63 mPassedThreshold = THRESHOLD_ONE; 64 } else if (progress < THRESHOLD_THREE) { 65 mPassedThreshold = THRESHOLD_TWO; 66 } else { 67 mPassedThreshold = THRESHOLD_THREE; 68 } 69 70 if (mPassedThreshold != previousPassedThreshold) { 71 Workspace.State fromState = mWorkspace.isInOverviewMode() ? Workspace.State.OVERVIEW 72 : Workspace.State.NORMAL; 73 Workspace.State toState = mWorkspace.isInOverviewMode() ? Workspace.State.NORMAL 74 : Workspace.State.OVERVIEW; 75 float thresholdToAnimate = mPassedThreshold; 76 if (mPassedThreshold < previousPassedThreshold) { 77 // User reversed pinch, so heading back to the state that they started from. 78 toState = fromState; 79 thresholdToAnimate = previousPassedThreshold; 80 } 81 animationManager.animateThreshold(thresholdToAnimate, fromState, toState); 82 } 83 return mPassedThreshold; 84 } 85 getPassedThreshold()86 public float getPassedThreshold() { 87 return mPassedThreshold; 88 } 89 reset()90 public void reset() { 91 mPassedThreshold = THRESHOLD_ZERO; 92 } 93 } 94