Add overscroll support for QS. (6b3b4f49) · Commits · e / os / android_frameworks_base

packages/SystemUI/src/com/android/systemui/qs/QSScrollLayout.java

+100 −3

Original line number	Diff line number	Diff line
		@@ -14,8 +14,11 @@

		package com.android.systemui.qs;

		import android.animation.ObjectAnimator;
		import android.content.Context;
		import android.graphics.Canvas;
		import android.support.v4.widget.NestedScrollView;
		import android.util.Property;
		import android.view.MotionEvent;
		import android.view.View;
		import android.view.ViewConfiguration;
		@@ -23,6 +26,8 @@ import android.view.ViewParent;
		import android.widget.LinearLayout;

		import com.android.systemui.R;
		import com.android.systemui.qs.touch.OverScroll;
		import com.android.systemui.qs.touch.SwipeDetector;

		/**
		* Quick setting scroll view containing the brightness slider and the QS tiles.
		@@ -35,6 +40,9 @@ public class QSScrollLayout extends NestedScrollView {
		private final int mTouchSlop;
		private final int mFooterHeight;
		private int mLastMotionY;
		private final SwipeDetector mSwipeDetector;
		private final OverScrollHelper mOverScrollHelper;
		private float mContentTranslationY;

		public QSScrollLayout(Context context, View... children) {
		super(context);
		@@ -49,15 +57,19 @@ public class QSScrollLayout extends NestedScrollView {
		linearLayout.addView(view);
		}
		addView(linearLayout);
		setOverScrollMode(OVER_SCROLL_NEVER);
		mOverScrollHelper = new OverScrollHelper();
		mSwipeDetector = new SwipeDetector(context, mOverScrollHelper, SwipeDetector.VERTICAL);
		mSwipeDetector.setDetectableScrollConditions(SwipeDetector.DIRECTION_BOTH, true);
		}


		@Override
		public boolean onInterceptTouchEvent(MotionEvent ev) {
		if (canScrollVertically(1) \|\| canScrollVertically(-1)) {
		return super.onInterceptTouchEvent(ev);
		}
		return false;
		mSwipeDetector.onTouchEvent(ev);
		return super.onInterceptTouchEvent(ev) \|\| mOverScrollHelper.isInOverScroll();
		}

		@Override
		@@ -65,7 +77,15 @@ public class QSScrollLayout extends NestedScrollView {
		if (canScrollVertically(1) \|\| canScrollVertically(-1)) {
		return super.onTouchEvent(ev);
		}
		return false;
		mSwipeDetector.onTouchEvent(ev);
		return super.onTouchEvent(ev);
		}

		@Override
		protected void dispatchDraw(Canvas canvas) {
		canvas.translate(0, mContentTranslationY);
		super.dispatchDraw(canvas);
		canvas.translate(0, -mContentTranslationY);
		}

		public boolean shouldIntercept(MotionEvent ev) {
		@@ -98,4 +118,81 @@ public class QSScrollLayout extends NestedScrollView {
		parent.requestDisallowInterceptTouchEvent(disallowIntercept);
		}
		}

		private void setContentTranslationY(float contentTranslationY) {
		mContentTranslationY = contentTranslationY;
		invalidate();
		}

		private static final Property<QSScrollLayout, Float> CONTENT_TRANS_Y =
		new Property<QSScrollLayout, Float>(Float.class, "qsScrollLayoutContentTransY") {
		@Override
		public Float get(QSScrollLayout qsScrollLayout) {
		return qsScrollLayout.mContentTranslationY;
		}

		@Override
		public void set(QSScrollLayout qsScrollLayout, Float y) {
		qsScrollLayout.setContentTranslationY(y);
		}
		};

		private class OverScrollHelper implements SwipeDetector.Listener {
		private boolean mIsInOverScroll;

		// We use this value to calculate the actual amount the user has overscrolled.
		private float mFirstDisplacement = 0;

		@Override
		public void onDragStart(boolean start) {}

		@Override
		public boolean onDrag(float displacement, float velocity) {
		// Only overscroll if the user is scrolling down when they're already at the bottom
		// or scrolling up when they're already at the top.
		boolean wasInOverScroll = mIsInOverScroll;
		mIsInOverScroll = (!canScrollVertically(1) && displacement < 0) \|\|
		(!canScrollVertically(-1) && displacement > 0);

		if (wasInOverScroll && !mIsInOverScroll) {
		// Exit overscroll. This can happen when the user is in overscroll and then
		// scrolls the opposite way. Note that this causes the reset translation animation
		// to run while the user is dragging, which feels a bit unnatural.
		reset();
		} else if (mIsInOverScroll) {
		if (Float.compare(mFirstDisplacement, 0) == 0) {
		// Because users can scroll before entering overscroll, we need to
		// subtract the amount where the user was not in overscroll.
		mFirstDisplacement = displacement;
		}
		float overscrollY = displacement - mFirstDisplacement;
		setContentTranslationY(getDampedOverScroll(overscrollY));
		}

		return mIsInOverScroll;
		}

		@Override
		public void onDragEnd(float velocity, boolean fling) {
		reset();
		}

		private void reset() {
		if (Float.compare(mContentTranslationY, 0) != 0) {
		ObjectAnimator.ofFloat(QSScrollLayout.this, CONTENT_TRANS_Y, 0)
		.setDuration(100)
		.start();
		}
		mIsInOverScroll = false;
		mFirstDisplacement = 0;
		}

		public boolean isInOverScroll() {
		return mIsInOverScroll;
		}

		private float getDampedOverScroll(float y) {
		return OverScroll.dampedScroll(y, getHeight());
		}
		}
		}

packages/SystemUI/src/com/android/systemui/qs/touch/OverScroll.java

0 → 100644

+57 −0

Original line number	Diff line number	Diff line
		/*
		* 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.systemui.qs.touch;

		/**
		* Utility methods for overscroll damping and related effect.
		*
		* Copied from packages/apps/Launcher3/src/com/android/launcher3/touch/OverScroll.java
		*/
		public class OverScroll {

		private static final float OVERSCROLL_DAMP_FACTOR = 0.07f;

		/**
		* This curve determines how the effect of scrolling over the limits of the page diminishes
		* as the user pulls further and further from the bounds
		*
		* @param f The percentage of how much the user has overscrolled.
		* @return A transformed percentage based on the influence curve.
		*/
		private static float overScrollInfluenceCurve(float f) {
		f -= 1.0f;
		return f * f * f + 1.0f;
		}

		/**
		* @param amount The original amount overscrolled.
		* @param max The maximum amount that the View can overscroll.
		* @return The dampened overscroll amount.
		*/
		public static int dampedScroll(float amount, int max) {
		if (Float.compare(amount, 0) == 0) return 0;

		float f = amount / max;
		f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));

		// Clamp this factor, f, to -1 < f < 1
		if (Math.abs(f) >= 1) {
		f /= Math.abs(f);
		}

		return Math.round(OVERSCROLL_DAMP_FACTOR * f * max);
		}
		}

packages/SystemUI/src/com/android/systemui/qs/touch/SwipeDetector.java

0 → 100644

+356 −0

Original line number	Diff line number	Diff line
		/*
		* 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.systemui.qs.touch;

		import static android.view.MotionEvent.INVALID_POINTER_ID;

		import android.content.Context;
		import android.graphics.PointF;
		import android.support.annotation.NonNull;
		import android.support.annotation.VisibleForTesting;
		import android.util.Log;
		import android.view.MotionEvent;
		import android.view.ViewConfiguration;

		/**
		* One dimensional scroll/drag/swipe gesture detector.
		*
		* Definition of swipe is different from android system in that this detector handles
		* 'swipe to dismiss', 'swiping up/down a container' but also keeps scrolling state before
		* swipe action happens
		*
		* Copied from packages/apps/Launcher3/src/com/android/launcher3/touch/SwipeDetector.java
		*/
		public class SwipeDetector {

		private static final boolean DBG = false;
		private static final String TAG = "SwipeDetector";

		private int mScrollConditions;
		public static final int DIRECTION_POSITIVE = 1 << 0;
		public static final int DIRECTION_NEGATIVE = 1 << 1;
		public static final int DIRECTION_BOTH = DIRECTION_NEGATIVE \| DIRECTION_POSITIVE;

		private static final float ANIMATION_DURATION = 1200;

		protected int mActivePointerId = INVALID_POINTER_ID;

		/**
		* The minimum release velocity in pixels per millisecond that triggers fling..
		*/
		public static final float RELEASE_VELOCITY_PX_MS = 1.0f;

		/**
		* The time constant used to calculate dampening in the low-pass filter of scroll velocity.
		* Cutoff frequency is set at 10 Hz.
		*/
		public static final float SCROLL_VELOCITY_DAMPENING_RC = 1000f / (2f * (float) Math.PI * 10);

		/* Scroll state, this is set to true during dragging and animation. */
		private ScrollState mState = ScrollState.IDLE;

		enum ScrollState {
		IDLE,
		DRAGGING, // onDragStart, onDrag
		SETTLING // onDragEnd
		}

		public static abstract class Direction {

		abstract float getDisplacement(MotionEvent ev, int pointerIndex, PointF refPoint);

		/**
		* Distance in pixels a touch can wander before we think the user is scrolling.
		*/
		abstract float getActiveTouchSlop(MotionEvent ev, int pointerIndex, PointF downPos);
		}

		public static final Direction VERTICAL = new Direction() {

		@Override
		float getDisplacement(MotionEvent ev, int pointerIndex, PointF refPoint) {
		return ev.getY(pointerIndex) - refPoint.y;
		}

		@Override
		float getActiveTouchSlop(MotionEvent ev, int pointerIndex, PointF downPos) {
		return Math.abs(ev.getX(pointerIndex) - downPos.x);
		}
		};

		public static final Direction HORIZONTAL = new Direction() {

		@Override
		float getDisplacement(MotionEvent ev, int pointerIndex, PointF refPoint) {
		return ev.getX(pointerIndex) - refPoint.x;
		}

		@Override
		float getActiveTouchSlop(MotionEvent ev, int pointerIndex, PointF downPos) {
		return Math.abs(ev.getY(pointerIndex) - downPos.y);
		}
		};

		//------------------- ScrollState transition diagram -----------------------------------
		//
		// IDLE -> (mDisplacement > mTouchSlop) -> DRAGGING
		// DRAGGING -> (MotionEvent#ACTION_UP, MotionEvent#ACTION_CANCEL) -> SETTLING
		// SETTLING -> (MotionEvent#ACTION_DOWN) -> DRAGGING
		// SETTLING -> (View settled) -> IDLE

		private void setState(ScrollState newState) {
		if (DBG) {
		Log.d(TAG, "setState:" + mState + "->" + newState);
		}
		// onDragStart and onDragEnd is reported ONLY on state transition
		if (newState == ScrollState.DRAGGING) {
		initializeDragging();
		if (mState == ScrollState.IDLE) {
		reportDragStart(false /* recatch */);
		} else if (mState == ScrollState.SETTLING) {
		reportDragStart(true /* recatch */);
		}
		}
		if (newState == ScrollState.SETTLING) {
		reportDragEnd();
		}

		mState = newState;
		}

		public boolean isDraggingOrSettling() {
		return mState == ScrollState.DRAGGING \|\| mState == ScrollState.SETTLING;
		}

		/**
		* There's no touch and there's no animation.
		*/
		public boolean isIdleState() {
		return mState == ScrollState.IDLE;
		}

		public boolean isSettlingState() {
		return mState == ScrollState.SETTLING;
		}

		public boolean isDraggingState() {
		return mState == ScrollState.DRAGGING;
		}

		private final PointF mDownPos = new PointF();
		private final PointF mLastPos = new PointF();
		private final Direction mDir;

		private final float mTouchSlop;

		/* Client of this gesture detector can register a callback. */
		private final Listener mListener;

		private long mCurrentMillis;

		private float mVelocity;
		private float mLastDisplacement;
		private float mDisplacement;

		private float mSubtractDisplacement;
		private boolean mIgnoreSlopWhenSettling;

		public interface Listener {
		void onDragStart(boolean start);

		boolean onDrag(float displacement, float velocity);

		void onDragEnd(float velocity, boolean fling);
		}

		public SwipeDetector(@NonNull Context context, @NonNull Listener l, @NonNull Direction dir) {
		this(ViewConfiguration.get(context).getScaledTouchSlop(), l, dir);
		}

		@VisibleForTesting
		protected SwipeDetector(float touchSlope, @NonNull Listener l, @NonNull Direction dir) {
		mTouchSlop = touchSlope;
		mListener = l;
		mDir = dir;
		}

		public void setDetectableScrollConditions(int scrollDirectionFlags, boolean ignoreSlop) {
		mScrollConditions = scrollDirectionFlags;
		mIgnoreSlopWhenSettling = ignoreSlop;
		}

		private boolean shouldScrollStart(MotionEvent ev, int pointerIndex) {
		// reject cases where the angle or slop condition is not met.
		if (Math.max(mDir.getActiveTouchSlop(ev, pointerIndex, mDownPos), mTouchSlop)
		> Math.abs(mDisplacement)) {
		return false;
		}

		// Check if the client is interested in scroll in current direction.
		if (((mScrollConditions & DIRECTION_NEGATIVE) > 0 && mDisplacement > 0) \|\|
		((mScrollConditions & DIRECTION_POSITIVE) > 0 && mDisplacement < 0)) {
		return true;
		}
		return false;
		}

		public boolean onTouchEvent(MotionEvent ev) {
		switch (ev.getActionMasked()) {
		case MotionEvent.ACTION_DOWN:
		mActivePointerId = ev.getPointerId(0);
		mDownPos.set(ev.getX(), ev.getY());
		mLastPos.set(mDownPos);
		mLastDisplacement = 0;
		mDisplacement = 0;
		mVelocity = 0;

		if (mState == ScrollState.SETTLING && mIgnoreSlopWhenSettling) {
		setState(ScrollState.DRAGGING);
		}
		break;
		//case MotionEvent.ACTION_POINTER_DOWN:
		case MotionEvent.ACTION_POINTER_UP:
		int ptrIdx = ev.getActionIndex();
		int ptrId = ev.getPointerId(ptrIdx);
		if (ptrId == mActivePointerId) {
		final int newPointerIdx = ptrIdx == 0 ? 1 : 0;
		mDownPos.set(
		ev.getX(newPointerIdx) - (mLastPos.x - mDownPos.x),
		ev.getY(newPointerIdx) - (mLastPos.y - mDownPos.y));
		mLastPos.set(ev.getX(newPointerIdx), ev.getY(newPointerIdx));
		mActivePointerId = ev.getPointerId(newPointerIdx);
		}
		break;
		case MotionEvent.ACTION_MOVE:
		int pointerIndex = ev.findPointerIndex(mActivePointerId);
		if (pointerIndex == INVALID_POINTER_ID) {
		break;
		}
		mDisplacement = mDir.getDisplacement(ev, pointerIndex, mDownPos);
		computeVelocity(mDir.getDisplacement(ev, pointerIndex, mLastPos),
		ev.getEventTime());

		// handle state and listener calls.
		if (mState != ScrollState.DRAGGING && shouldScrollStart(ev, pointerIndex)) {
		setState(ScrollState.DRAGGING);
		}
		if (mState == ScrollState.DRAGGING) {
		reportDragging();
		}
		mLastPos.set(ev.getX(pointerIndex), ev.getY(pointerIndex));
		break;
		case MotionEvent.ACTION_CANCEL:
		case MotionEvent.ACTION_UP:
		// These are synthetic events and there is no need to update internal values.
		if (mState == ScrollState.DRAGGING) {
		setState(ScrollState.SETTLING);
		}
		break;
		default:
		break;
		}
		return true;
		}

		public void finishedScrolling() {
		setState(ScrollState.IDLE);
		}

		private boolean reportDragStart(boolean recatch) {
		mListener.onDragStart(!recatch);
		if (DBG) {
		Log.d(TAG, "onDragStart recatch:" + recatch);
		}
		return true;
		}

		private void initializeDragging() {
		if (mState == ScrollState.SETTLING && mIgnoreSlopWhenSettling) {
		mSubtractDisplacement = 0;
		}
		if (mDisplacement > 0) {
		mSubtractDisplacement = mTouchSlop;
		} else {
		mSubtractDisplacement = -mTouchSlop;
		}
		}

		private boolean reportDragging() {
		if (mDisplacement != mLastDisplacement) {
		if (DBG) {
		Log.d(TAG, String.format("onDrag disp=%.1f, velocity=%.1f",
		mDisplacement, mVelocity));
		}

		mLastDisplacement = mDisplacement;
		return mListener.onDrag(mDisplacement - mSubtractDisplacement, mVelocity);
		}
		return true;
		}

		private void reportDragEnd() {
		if (DBG) {
		Log.d(TAG, String.format("onScrollEnd disp=%.1f, velocity=%.1f",
		mDisplacement, mVelocity));
		}
		mListener.onDragEnd(mVelocity, Math.abs(mVelocity) > RELEASE_VELOCITY_PX_MS);

		}

		/**
		* Computes the damped velocity.
		*/
		public float computeVelocity(float delta, long currentMillis) {
		long previousMillis = mCurrentMillis;
		mCurrentMillis = currentMillis;

		float deltaTimeMillis = mCurrentMillis - previousMillis;
		float velocity = (deltaTimeMillis > 0) ? (delta / deltaTimeMillis) : 0;
		if (Math.abs(mVelocity) < 0.001f) {
		mVelocity = velocity;
		} else {
		float alpha = computeDampeningFactor(deltaTimeMillis);
		mVelocity = interpolate(mVelocity, velocity, alpha);
		}
		return mVelocity;
		}

		/**
		* Returns a time-dependent dampening factor using delta time.
		*/
		private static float computeDampeningFactor(float deltaTime) {
		return deltaTime / (SCROLL_VELOCITY_DAMPENING_RC + deltaTime);
		}

		/**
		* Returns the linear interpolation between two values
		*/
		private static float interpolate(float from, float to, float alpha) {
		return (1.0f - alpha) * from + alpha * to;
		}

		public static long calculateDuration(float velocity, float progressNeeded) {
		// TODO: make these values constants after tuning.
		float velocityDivisor = Math.max(2f, Math.abs(0.5f * velocity));
		float travelDistance = Math.max(0.2f, progressNeeded);
		long duration = (long) Math.max(100, ANIMATION_DURATION / velocityDivisor * travelDistance);
		if (DBG) {
		Log.d(TAG, String.format("calculateDuration=%d, v=%f, d=%f", duration, velocity, progressNeeded));
		}
		return duration;
		}
		}