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/*
* Copyright (C) 2016 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;
/**
* Keeps track of when thresholds are passed during a pinch gesture,
* used to inform {@link PinchAnimationManager} throughout.
*
* @see PinchToOverviewListener
* @see PinchAnimationManager
*/
public class PinchThresholdManager {
public static final float THRESHOLD_ZERO = 0.0f;
public static final float THRESHOLD_ONE = 0.40f;
public static final float THRESHOLD_TWO = 0.70f;
public static final float THRESHOLD_THREE = 0.95f;
private Workspace mWorkspace;
private float mPassedThreshold = THRESHOLD_ZERO;
public PinchThresholdManager(Workspace workspace) {
mWorkspace = workspace;
}
/**
* Uses the pinch progress to determine whether a threshold has been passed,
* and asks the {@param animationManager} to animate if so.
* @param progress From 0 to 1, where 0 is overview and 1 is workspace.
* @param animationManager Animates the threshold change if one is passed.
* @return The last passed threshold, one of
* {@link PinchThresholdManager#THRESHOLD_ZERO},
* {@link PinchThresholdManager#THRESHOLD_ONE},
* {@link PinchThresholdManager#THRESHOLD_TWO}, or
* {@link PinchThresholdManager#THRESHOLD_THREE}
*/
public float updateAndAnimatePassedThreshold(float progress,
PinchAnimationManager animationManager) {
if (!mWorkspace.isInOverviewMode()) {
// Invert the progress, because going from workspace to overview is 1 to 0.
progress = 1f - progress;
}
float previousPassedThreshold = mPassedThreshold;
if (progress < THRESHOLD_ONE) {
mPassedThreshold = THRESHOLD_ZERO;
} else if (progress < THRESHOLD_TWO) {
mPassedThreshold = THRESHOLD_ONE;
} else if (progress < THRESHOLD_THREE) {
mPassedThreshold = THRESHOLD_TWO;
} else {
mPassedThreshold = THRESHOLD_THREE;
}
if (mPassedThreshold != previousPassedThreshold) {
Workspace.State fromState = mWorkspace.isInOverviewMode() ? Workspace.State.OVERVIEW
: Workspace.State.NORMAL;
Workspace.State toState = mWorkspace.isInOverviewMode() ? Workspace.State.NORMAL
: Workspace.State.OVERVIEW;
float thresholdToAnimate = mPassedThreshold;
if (mPassedThreshold < previousPassedThreshold) {
// User reversed pinch, so heading back to the state that they started from.
toState = fromState;
thresholdToAnimate = previousPassedThreshold;
}
animationManager.animateThreshold(thresholdToAnimate, fromState, toState);
}
return mPassedThreshold;
}
public float getPassedThreshold() {
return mPassedThreshold;
}
public void reset() {
mPassedThreshold = THRESHOLD_ZERO;
}
}
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