Home | History | Annotate | Download | only in misc 
      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.recents.misc;
     18 
     19 import android.os.Handler;
     20 import android.os.SystemClock;
     21 import android.view.KeyEvent;
     22 import com.android.systemui.recents.Constants;
     23 
     24 /**
     25  * A trigger for catching a debug chord.
     26  * We currently use volume up then volume down to trigger this mode.
     27  */
     28 public class DebugTrigger {
     29 
     30     Handler mHandler;
     31     Runnable mTriggeredRunnable;
     32 
     33     int mLastKeyCode;
     34     long mLastKeyCodeTime;
     35 
     36     public DebugTrigger(Runnable triggeredRunnable) {
     37         mHandler = new Handler();
     38         mTriggeredRunnable = triggeredRunnable;
     39     }
     40 
     41     /** Resets the debug trigger */
     42     void reset() {
     43         mLastKeyCode = 0;
     44         mLastKeyCodeTime = 0;
     45     }
     46 
     47     /**
     48      * Processes a key event and tests if it is a part of the trigger. If the chord is complete,
     49      * then we just call the callback.
     50      */
     51     public void onKeyEvent(int keyCode) {
     52         if (!Constants.DebugFlags.App.EnableDebugMode) return;
     53 
     54         if (mLastKeyCode == 0) {
     55             if (keyCode == KeyEvent.KEYCODE_VOLUME_UP) {
     56                 mLastKeyCode = keyCode;
     57                 mLastKeyCodeTime = SystemClock.uptimeMillis();
     58                 return;
     59             }
     60         } else {
     61             if (mLastKeyCode == KeyEvent.KEYCODE_VOLUME_UP &&
     62                     keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
     63                 if ((SystemClock.uptimeMillis() - mLastKeyCodeTime) < 750) {
     64                     mTriggeredRunnable.run();
     65                 }
     66             }
     67         }
     68         reset();
     69     }
     70 }
     71