| /* |
| * 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; |
| |
| 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; |
| 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. |
| * |
| * <p>Call {@link #shouldIntercept(MotionEvent)} from parent views' |
| * {@link #onInterceptTouchEvent(MotionEvent)} method to determine whether this view should |
| * consume the touch event. |
| */ |
| 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); |
| mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop(); |
| mFooterHeight = getResources().getDimensionPixelSize(R.dimen.qs_footer_height); |
| LinearLayout linearLayout = new LinearLayout(mContext); |
| linearLayout.setLayoutParams(new LinearLayout.LayoutParams( |
| LinearLayout.LayoutParams.MATCH_PARENT, |
| LinearLayout.LayoutParams.WRAP_CONTENT)); |
| linearLayout.setOrientation(LinearLayout.VERTICAL); |
| for (View view : children) { |
| 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 false; |
| } |
| mSwipeDetector.onTouchEvent(ev); |
| return super.onInterceptTouchEvent(ev) || mOverScrollHelper.isInOverScroll(); |
| } |
| |
| @Override |
| public boolean onTouchEvent(MotionEvent ev) { |
| if (!canScrollVertically(1) && !canScrollVertically(-1)) { |
| 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) { |
| if (ev.getY() > (getBottom() - mFooterHeight)) { |
| // Do not intercept touches that are below the divider between QS and the footer. |
| return false; |
| } |
| if (ev.getActionMasked() == MotionEvent.ACTION_DOWN) { |
| mLastMotionY = (int) ev.getY(); |
| } else if (ev.getActionMasked() == MotionEvent.ACTION_MOVE) { |
| // Do not allow NotificationPanelView to intercept touch events when this |
| // view can be scrolled down. |
| if (mLastMotionY >= 0 && Math.abs(ev.getY() - mLastMotionY) > mTouchSlop |
| && canScrollVertically(1)) { |
| requestParentDisallowInterceptTouchEvent(true); |
| mLastMotionY = (int) ev.getY(); |
| return true; |
| } |
| } else if (ev.getActionMasked() == MotionEvent.ACTION_CANCEL |
| || ev.getActionMasked() == MotionEvent.ACTION_UP) { |
| mLastMotionY = -1; |
| requestParentDisallowInterceptTouchEvent(false); |
| } |
| return false; |
| } |
| |
| private void requestParentDisallowInterceptTouchEvent(boolean disallowIntercept) { |
| final ViewParent parent = getParent(); |
| if (parent != null) { |
| 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()); |
| } |
| } |
| } |