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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.content.res.Resources;
     21 import android.view.GestureDetector;
     22 import android.view.MotionEvent;
     23 import android.view.ViewConfiguration;
     24 import com.android.systemui.R;
     25 import com.android.systemui.statusbar.BaseStatusBar;
     26 
     27 public class NavigationBarViewTaskSwitchHelper extends GestureDetector.SimpleOnGestureListener {
     28 
     29     private BaseStatusBar mBar;
     30     private boolean mIsVertical;
     31     private boolean mIsRTL;
     32 
     33     private final GestureDetector mTaskSwitcherDetector;
     34     private final int mScrollTouchSlop;
     35     private final int mMinFlingVelocity;
     36     private int mTouchDownX;
     37     private int mTouchDownY;
     38 
     39     public NavigationBarViewTaskSwitchHelper(Context context) {
     40         ViewConfiguration configuration = ViewConfiguration.get(context);
     41         Resources r = context.getResources();
     42         mScrollTouchSlop = r.getDimensionPixelSize(R.dimen.navigation_bar_min_swipe_distance);
     43         mMinFlingVelocity = configuration.getScaledMinimumFlingVelocity();
     44         mTaskSwitcherDetector = new GestureDetector(context, this);
     45     }
     46 
     47     public void setBar(BaseStatusBar phoneStatusBar) {
     48         mBar = phoneStatusBar;
     49     }
     50 
     51     public void setBarState(boolean isVertical, boolean isRTL) {
     52         mIsVertical = isVertical;
     53         mIsRTL = isRTL;
     54     }
     55 
     56     public boolean onInterceptTouchEvent(MotionEvent event) {
     57         // If we move more than a fixed amount, then start capturing for the
     58         // task switcher detector
     59         mTaskSwitcherDetector.onTouchEvent(event);
     60         int action = event.getAction();
     61         boolean intercepted = false;
     62         switch (action & MotionEvent.ACTION_MASK) {
     63             case MotionEvent.ACTION_DOWN: {
     64                 mTouchDownX = (int) event.getX();
     65                 mTouchDownY = (int) event.getY();
     66                 break;
     67             }
     68             case MotionEvent.ACTION_MOVE: {
     69                 int x = (int) event.getX();
     70                 int y = (int) event.getY();
     71                 int xDiff = Math.abs(x - mTouchDownX);
     72                 int yDiff = Math.abs(y - mTouchDownY);
     73                 boolean exceededTouchSlop = !mIsVertical
     74                         ? xDiff > mScrollTouchSlop && xDiff > yDiff
     75                         : yDiff > mScrollTouchSlop && yDiff > xDiff;
     76                 if (exceededTouchSlop) {
     77                     return true;
     78                 }
     79                 break;
     80             }
     81             case MotionEvent.ACTION_CANCEL:
     82             case MotionEvent.ACTION_UP:
     83                 break;
     84         }
     85         return intercepted;
     86     }
     87 
     88     public boolean onTouchEvent(MotionEvent event) {
     89         return mTaskSwitcherDetector.onTouchEvent(event);
     90     }
     91 
     92     @Override
     93     public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
     94         float absVelX = Math.abs(velocityX);
     95         float absVelY = Math.abs(velocityY);
     96         boolean isValidFling = absVelX > mMinFlingVelocity &&
     97                 mIsVertical ? (absVelY > absVelX) : (absVelX > absVelY);
     98         if (isValidFling) {
     99             boolean showNext;
    100             if (!mIsRTL) {
    101                 showNext = mIsVertical ? (velocityY < 0) : (velocityX < 0);
    102             } else {
    103                 // In RTL, vertical is still the same, but horizontal is flipped
    104                 showNext = mIsVertical ? (velocityY < 0) : (velocityX > 0);
    105             }
    106             if (showNext) {
    107                 mBar.showNextAffiliatedTask();
    108             } else {
    109                 mBar.showPreviousAffiliatedTask();
    110             }
    111         }
    112         return true;
    113     }
    114 }
    115