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      1 /*
      2  * Copyright (C) 2015 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.systemui.statusbar.phone;
     18 
     19 import android.content.Context;
     20 import android.view.MotionEvent;
     21 import android.view.ViewConfiguration;
     22 
     23 import com.android.systemui.Gefingerpoken;
     24 import com.android.systemui.statusbar.ExpandableNotificationRow;
     25 import com.android.systemui.statusbar.ExpandableView;
     26 import com.android.systemui.statusbar.policy.HeadsUpManager;
     27 import com.android.systemui.statusbar.stack.NotificationStackScrollLayout;
     28 
     29 /**
     30  * A helper class to handle touches on the heads-up views.
     31  */
     32 public class HeadsUpTouchHelper implements Gefingerpoken {
     33 
     34     private HeadsUpManager mHeadsUpManager;
     35     private NotificationStackScrollLayout mStackScroller;
     36     private int mTrackingPointer;
     37     private float mTouchSlop;
     38     private float mInitialTouchX;
     39     private float mInitialTouchY;
     40     private boolean mTouchingHeadsUpView;
     41     private boolean mTrackingHeadsUp;
     42     private boolean mCollapseSnoozes;
     43     private NotificationPanelView mPanel;
     44     private ExpandableNotificationRow mPickedChild;
     45 
     46     public HeadsUpTouchHelper(HeadsUpManager headsUpManager,
     47             NotificationStackScrollLayout stackScroller,
     48             NotificationPanelView notificationPanelView) {
     49         mHeadsUpManager = headsUpManager;
     50         mStackScroller = stackScroller;
     51         mPanel = notificationPanelView;
     52         Context context = stackScroller.getContext();
     53         final ViewConfiguration configuration = ViewConfiguration.get(context);
     54         mTouchSlop = configuration.getScaledTouchSlop();
     55     }
     56 
     57     public boolean isTrackingHeadsUp() {
     58         return mTrackingHeadsUp;
     59     }
     60 
     61     @Override
     62     public boolean onInterceptTouchEvent(MotionEvent event) {
     63         if (!mTouchingHeadsUpView && event.getActionMasked() != MotionEvent.ACTION_DOWN) {
     64             return false;
     65         }
     66         int pointerIndex = event.findPointerIndex(mTrackingPointer);
     67         if (pointerIndex < 0) {
     68             pointerIndex = 0;
     69             mTrackingPointer = event.getPointerId(pointerIndex);
     70         }
     71         final float x = event.getX(pointerIndex);
     72         final float y = event.getY(pointerIndex);
     73         switch (event.getActionMasked()) {
     74             case MotionEvent.ACTION_DOWN:
     75                 mInitialTouchY = y;
     76                 mInitialTouchX = x;
     77                 setTrackingHeadsUp(false);
     78                 ExpandableView child = mStackScroller.getChildAtRawPosition(x, y);
     79                 mTouchingHeadsUpView = false;
     80                 if (child instanceof ExpandableNotificationRow) {
     81                     mPickedChild = (ExpandableNotificationRow) child;
     82                     mTouchingHeadsUpView = !mStackScroller.isExpanded()
     83                             && mPickedChild.isHeadsUp() && mPickedChild.isPinned();
     84                 }
     85                 break;
     86             case MotionEvent.ACTION_POINTER_UP:
     87                 final int upPointer = event.getPointerId(event.getActionIndex());
     88                 if (mTrackingPointer == upPointer) {
     89                     // gesture is ongoing, find a new pointer to track
     90                     final int newIndex = event.getPointerId(0) != upPointer ? 0 : 1;
     91                     mTrackingPointer = event.getPointerId(newIndex);
     92                     mInitialTouchX = event.getX(newIndex);
     93                     mInitialTouchY = event.getY(newIndex);
     94                 }
     95                 break;
     96 
     97             case MotionEvent.ACTION_MOVE:
     98                 final float h = y - mInitialTouchY;
     99                 if (mTouchingHeadsUpView && Math.abs(h) > mTouchSlop
    100                         && Math.abs(h) > Math.abs(x - mInitialTouchX)) {
    101                     setTrackingHeadsUp(true);
    102                     mCollapseSnoozes = h < 0;
    103                     mInitialTouchX = x;
    104                     mInitialTouchY = y;
    105                     int expandedHeight = mPickedChild.getActualHeight();
    106                     mPanel.setPanelScrimMinFraction((float) expandedHeight
    107                             / mPanel.getMaxPanelHeight());
    108                     mPanel.startExpandMotion(x, y, true /* startTracking */, expandedHeight);
    109                     mPanel.startExpandingFromPeek();
    110                     // This call needs to be after the expansion start otherwise we will get a
    111                     // flicker of one frame as it's not expanded yet.
    112                     mHeadsUpManager.unpinAll();
    113                     mPanel.clearNotificationEffects();
    114                     return true;
    115                 }
    116                 break;
    117 
    118             case MotionEvent.ACTION_CANCEL:
    119             case MotionEvent.ACTION_UP:
    120                 if (mPickedChild != null && mTouchingHeadsUpView) {
    121                     // We may swallow this click if the heads up just came in.
    122                     if (mHeadsUpManager.shouldSwallowClick(
    123                             mPickedChild.getStatusBarNotification().getKey())) {
    124                         endMotion();
    125                         return true;
    126                     }
    127                 }
    128                 endMotion();
    129                 break;
    130         }
    131         return false;
    132     }
    133 
    134     private void setTrackingHeadsUp(boolean tracking) {
    135         mTrackingHeadsUp = tracking;
    136         mHeadsUpManager.setTrackingHeadsUp(tracking);
    137         mPanel.setTrackingHeadsUp(tracking);
    138     }
    139 
    140     public void notifyFling(boolean collapse) {
    141         if (collapse && mCollapseSnoozes) {
    142             mHeadsUpManager.snooze();
    143         }
    144         mCollapseSnoozes = false;
    145     }
    146 
    147     @Override
    148     public boolean onTouchEvent(MotionEvent event) {
    149         if (!mTrackingHeadsUp) {
    150             return false;
    151         }
    152         switch (event.getActionMasked()) {
    153             case MotionEvent.ACTION_UP:
    154             case MotionEvent.ACTION_CANCEL:
    155                 endMotion();
    156                 setTrackingHeadsUp(false);
    157                 break;
    158         }
    159         return true;
    160     }
    161 
    162     private void endMotion() {
    163         mTrackingPointer = -1;
    164         mPickedChild = null;
    165         mTouchingHeadsUpView = false;
    166     }
    167 }
    168