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      1 /*
      2  * Copyright (C) 2014 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.GestureDetector;
     21 import android.view.MotionEvent;
     22 import android.view.ViewConfiguration;
     23 import com.android.systemui.statusbar.BaseStatusBar;
     24 
     25 public class NavigationBarViewTaskSwitchHelper extends GestureDetector.SimpleOnGestureListener {
     26 
     27     private BaseStatusBar mBar;
     28     private boolean mIsVertical;
     29     private boolean mIsRTL;
     30 
     31     private final GestureDetector mTaskSwitcherDetector;
     32     private final int mScrollTouchSlop;
     33     private final int mMinFlingVelocity;
     34     private int mTouchDownX;
     35     private int mTouchDownY;
     36 
     37     public NavigationBarViewTaskSwitchHelper(Context context) {
     38         ViewConfiguration configuration = ViewConfiguration.get(context);
     39         mScrollTouchSlop = 4 * configuration.getScaledTouchSlop();
     40         mMinFlingVelocity = configuration.getScaledMinimumFlingVelocity();
     41         mTaskSwitcherDetector = new GestureDetector(context, this);
     42     }
     43 
     44     public void setBar(BaseStatusBar phoneStatusBar) {
     45         mBar = phoneStatusBar;
     46     }
     47 
     48     public void setBarState(boolean isVertical, boolean isRTL) {
     49         mIsVertical = isVertical;
     50         mIsRTL = isRTL;
     51     }
     52 
     53     public boolean onInterceptTouchEvent(MotionEvent event) {
     54         // If we move more than a fixed amount, then start capturing for the
     55         // task switcher detector
     56         mTaskSwitcherDetector.onTouchEvent(event);
     57         int action = event.getAction();
     58         boolean intercepted = false;
     59         switch (action & MotionEvent.ACTION_MASK) {
     60             case MotionEvent.ACTION_DOWN: {
     61                 mTouchDownX = (int) event.getX();
     62                 mTouchDownY = (int) event.getY();
     63                 break;
     64             }
     65             case MotionEvent.ACTION_MOVE: {
     66                 int x = (int) event.getX();
     67                 int y = (int) event.getY();
     68                 int xDiff = Math.abs(x - mTouchDownX);
     69                 int yDiff = Math.abs(y - mTouchDownY);
     70                 boolean exceededTouchSlop = !mIsVertical
     71                         ? xDiff > mScrollTouchSlop && xDiff > yDiff
     72                         : yDiff > mScrollTouchSlop && yDiff > xDiff;
     73                 if (exceededTouchSlop) {
     74                     return true;
     75                 }
     76                 break;
     77             }
     78             case MotionEvent.ACTION_CANCEL:
     79             case MotionEvent.ACTION_UP:
     80                 break;
     81         }
     82         return intercepted;
     83     }
     84 
     85     public boolean onTouchEvent(MotionEvent event) {
     86         return mTaskSwitcherDetector.onTouchEvent(event);
     87     }
     88 
     89     @Override
     90     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
     91         float absVelX = Math.abs(velocityX);
     92         float absVelY = Math.abs(velocityY);
     93         boolean isValidFling = absVelX > mMinFlingVelocity &&
     94                 mIsVertical ? (absVelY > absVelX) : (absVelX > absVelY);
     95         if (isValidFling) {
     96             boolean showNext;
     97             if (!mIsRTL) {
     98                 showNext = mIsVertical ? (velocityY < 0) : (velocityX < 0);
     99             } else {
    100                 // In RTL, vertical is still the same, but horizontal is flipped
    101                 showNext = mIsVertical ? (velocityY < 0) : (velocityX > 0);
    102             }
    103             if (showNext) {
    104                 mBar.showNextAffiliatedTask();
    105             } else {
    106                 mBar.showPreviousAffiliatedTask();
    107             }
    108         }
    109         return true;
    110     }
    111 }
    112