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      1 /*
      2  * Copyright (C) 2013 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.keyguard;
     18 
     19 import android.content.Context;
     20 import android.view.MotionEvent;
     21 import android.view.View;
     22 import android.view.accessibility.AccessibilityManager;
     23 
     24 /**
     25  * Hover listener that implements lift-to-activate interaction for
     26  * accessibility. May be added to multiple views.
     27  */
     28 class LiftToActivateListener implements View.OnHoverListener {
     29     /** Manager used to query accessibility enabled state. */
     30     private final AccessibilityManager mAccessibilityManager;
     31 
     32     private boolean mCachedClickableState;
     33 
     34     public LiftToActivateListener(Context context) {
     35         mAccessibilityManager = (AccessibilityManager) context.getSystemService(
     36                 Context.ACCESSIBILITY_SERVICE);
     37     }
     38 
     39     @Override
     40     public boolean onHover(View v, MotionEvent event) {
     41         // When touch exploration is turned on, lifting a finger while
     42         // inside the view bounds should perform a click action.
     43         if (mAccessibilityManager.isEnabled()
     44                 && mAccessibilityManager.isTouchExplorationEnabled()) {
     45             switch (event.getActionMasked()) {
     46                 case MotionEvent.ACTION_HOVER_ENTER:
     47                     // Lift-to-type temporarily disables double-tap
     48                     // activation by setting the view as not clickable.
     49                     mCachedClickableState = v.isClickable();
     50                     v.setClickable(false);
     51                     break;
     52                 case MotionEvent.ACTION_HOVER_EXIT:
     53                     final int x = (int) event.getX();
     54                     final int y = (int) event.getY();
     55                     if ((x > v.getPaddingLeft()) && (y > v.getPaddingTop())
     56                             && (x < v.getWidth() - v.getPaddingRight())
     57                             && (y < v.getHeight() - v.getPaddingBottom())) {
     58                         v.performClick();
     59                     }
     60                     v.setClickable(mCachedClickableState);
     61                     break;
     62             }
     63         }
     64 
     65         // Pass the event to View.onHoverEvent() to handle accessibility.
     66         v.onHoverEvent(event);
     67 
     68         // Consume the event so it doesn't fall through to other views.
     69         return true;
     70     }
     71 }