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/*
* 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.launcher3.util;
import static com.android.launcher3.LauncherState.ALL_APPS;
import static com.android.launcher3.anim.Interpolators.scrollInterpolatorForVelocity;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.ValueAnimator;
import android.util.Log;
import android.view.MotionEvent;
import com.android.launcher3.AbstractFloatingView;
import com.android.launcher3.Launcher;
import com.android.launcher3.LauncherState;
import com.android.launcher3.Utilities;
import com.android.launcher3.anim.AnimatorPlaybackController;
import com.android.launcher3.touch.SwipeDetector;
import com.android.launcher3.touch.SwipeDetector.Direction;
/**
* Handles vertical touch gesture on the DragLayer allowing transitioning from
* {@link #mBaseState} to {@link LauncherState#ALL_APPS} and vice-versa.
*/
public abstract class VerticalSwipeController extends AnimatorListenerAdapter
implements TouchController, SwipeDetector.Listener {
private static final String TAG = "VerticalSwipeController";
private static final float RECATCH_REJECTION_FRACTION = .0875f;
private static final int SINGLE_FRAME_MS = 16;
// Progress after which the transition is assumed to be a success in case user does not fling
private static final float SUCCESS_TRANSITION_PROGRESS = 0.5f;
protected final Launcher mLauncher;
protected final SwipeDetector mDetector;
private final LauncherState mBaseState;
private final LauncherState mTargetState;
private boolean mNoIntercept;
private AnimatorPlaybackController mCurrentAnimation;
protected LauncherState mToState;
private float mStartProgress;
// Ratio of transition process [0, 1] to drag displacement (px)
private float mProgressMultiplier;
public VerticalSwipeController(Launcher l, LauncherState baseState) {
this(l, baseState, ALL_APPS, SwipeDetector.VERTICAL);
}
public VerticalSwipeController(
Launcher l, LauncherState baseState, LauncherState targetState, Direction dir) {
mLauncher = l;
mDetector = new SwipeDetector(l, this, dir);
mBaseState = baseState;
mTargetState = targetState;
}
private boolean canInterceptTouch(MotionEvent ev) {
if (mCurrentAnimation != null) {
// If we are already animating from a previous state, we can intercept.
return true;
}
if (AbstractFloatingView.getTopOpenView(mLauncher) != null) {
return false;
}
return shouldInterceptTouch(ev);
}
protected abstract boolean shouldInterceptTouch(MotionEvent ev);
@Override
public void onAnimationCancel(Animator animation) {
if (mCurrentAnimation != null && animation == mCurrentAnimation.getTarget()) {
Log.e(TAG, "Who dare cancel the animation when I am in control", new Exception());
mDetector.finishedScrolling();
mCurrentAnimation = null;
}
}
@Override
public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
mNoIntercept = !canInterceptTouch(ev);
if (mNoIntercept) {
return false;
}
// Now figure out which direction scroll events the controller will start
// calling the callbacks.
final int directionsToDetectScroll;
boolean ignoreSlopWhenSettling = false;
if (mCurrentAnimation != null) {
if (mCurrentAnimation.getProgressFraction() > 1 - RECATCH_REJECTION_FRACTION) {
directionsToDetectScroll = SwipeDetector.DIRECTION_POSITIVE;
} else if (mCurrentAnimation.getProgressFraction() < RECATCH_REJECTION_FRACTION ) {
directionsToDetectScroll = SwipeDetector.DIRECTION_NEGATIVE;
} else {
directionsToDetectScroll = SwipeDetector.DIRECTION_BOTH;
ignoreSlopWhenSettling = true;
}
} else {
directionsToDetectScroll = getSwipeDirection(ev);
}
mDetector.setDetectableScrollConditions(
directionsToDetectScroll, ignoreSlopWhenSettling);
}
if (mNoIntercept) {
return false;
}
onControllerTouchEvent(ev);
return mDetector.isDraggingOrSettling();
}
protected abstract int getSwipeDirection(MotionEvent ev);
@Override
public boolean onControllerTouchEvent(MotionEvent ev) {
return mDetector.onTouchEvent(ev);
}
@Override
public void onDragStart(boolean start) {
if (mCurrentAnimation == null) {
float range = getShiftRange();
long maxAccuracy = (long) (2 * range);
// Build current animation
mToState = mLauncher.isInState(mTargetState) ? mBaseState : mTargetState;
mCurrentAnimation = mLauncher.getStateManager()
.createAnimationToNewWorkspace(mToState, maxAccuracy);
mCurrentAnimation.getTarget().addListener(this);
mStartProgress = 0;
mProgressMultiplier =
(mLauncher.isInState(mTargetState) ^ isTransitionFlipped() ? 1 : -1) / range;
mCurrentAnimation.dispatchOnStart();
} else {
mCurrentAnimation.pause();
mStartProgress = mCurrentAnimation.getProgressFraction();
}
}
protected boolean isTransitionFlipped() {
return false;
}
protected float getShiftRange() {
return mLauncher.getAllAppsController().getShiftRange();
}
@Override
public boolean onDrag(float displacement, float velocity) {
float deltaProgress = mProgressMultiplier * displacement;
mCurrentAnimation.setPlayFraction(deltaProgress + mStartProgress);
return true;
}
@Override
public void onDragEnd(float velocity, boolean fling) {
final long animationDuration;
final LauncherState targetState;
final float progress = mCurrentAnimation.getProgressFraction();
if (fling) {
if (velocity < 0 ^ isTransitionFlipped()) {
targetState = mTargetState;
} else {
targetState = mBaseState;
}
animationDuration = SwipeDetector.calculateDuration(velocity,
mToState == targetState ? (1 - progress) : progress);
// snap to top or bottom using the release velocity
} else {
if (progress > SUCCESS_TRANSITION_PROGRESS) {
targetState = mToState;
animationDuration = SwipeDetector.calculateDuration(velocity, 1 - progress);
} else {
targetState = mToState == mTargetState ? mBaseState : mTargetState;
animationDuration = SwipeDetector.calculateDuration(velocity, progress);
}
}
mCurrentAnimation.setEndAction(() -> {
mLauncher.getStateManager().goToState(targetState, false);
onTransitionComplete(fling, targetState == mToState);
mDetector.finishedScrolling();
mCurrentAnimation = null;
});
float nextFrameProgress = Utilities.boundToRange(
progress + velocity * SINGLE_FRAME_MS * mProgressMultiplier, 0f, 1f);
ValueAnimator anim = mCurrentAnimation.getAnimationPlayer();
anim.setFloatValues(nextFrameProgress, targetState == mToState ? 1f : 0f);
anim.setDuration(animationDuration);
anim.setInterpolator(scrollInterpolatorForVelocity(velocity));
anim.start();
}
protected abstract void onTransitionComplete(boolean wasFling, boolean stateChanged);
}
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