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      1 /*
      2  * Copyright (C) 2012 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.view.MotionEvent;
     20 import android.view.View;
     21 import android.view.ViewConfiguration;
     22 
     23 public class CheckLongPressHelper {
     24     private View mView;
     25     private boolean mHasPerformedLongPress;
     26     private CheckForLongPress mPendingCheckForLongPress;
     27     private float mDownX, mDownY;
     28     private int mLongPressTimeout;
     29     private int mScaledTouchSlop;
     30 
     31     class CheckForLongPress implements Runnable {
     32         public void run() {
     33             if ((mView.getParent() != null) && mView.hasWindowFocus()
     34                     && !mHasPerformedLongPress) {
     35                 if (mView.performLongClick()) {
     36                     mView.setPressed(false);
     37                     mHasPerformedLongPress = true;
     38                 }
     39             }
     40         }
     41     }
     42 
     43     public CheckLongPressHelper(View v) {
     44         mScaledTouchSlop = ViewConfiguration.get(v.getContext()).getScaledTouchSlop();
     45         mLongPressTimeout = ViewConfiguration.getLongPressTimeout();
     46         mView = v;
     47     }
     48 
     49     public void postCheckForLongPress(MotionEvent ev) {
     50         mDownX = ev.getX();
     51         mDownY = ev.getY();
     52         mHasPerformedLongPress = false;
     53 
     54         if (mPendingCheckForLongPress == null) {
     55             mPendingCheckForLongPress = new CheckForLongPress();
     56         }
     57         mView.postDelayed(mPendingCheckForLongPress, mLongPressTimeout);
     58     }
     59 
     60     public void onMove(MotionEvent ev) {
     61         float x = ev.getX();
     62         float y = ev.getY();
     63         boolean xMoved = Math.abs(mDownX - x) > mScaledTouchSlop;
     64         boolean yMoved = Math.abs(mDownY - y) > mScaledTouchSlop;
     65 
     66         if (xMoved || yMoved) {
     67             cancelLongPress();
     68         }
     69     }
     70 
     71     public void cancelLongPress() {
     72         mHasPerformedLongPress = false;
     73         if (mPendingCheckForLongPress != null) {
     74             mView.removeCallbacks(mPendingCheckForLongPress);
     75             mPendingCheckForLongPress = null;
     76         }
     77     }
     78 
     79     public boolean hasPerformedLongPress() {
     80         return mHasPerformedLongPress;
     81     }
     82 }
     83