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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file
      5  * except in compliance with the License. You may obtain a copy of the License at
      6  *
      7  *      http://www.apache.org/licenses/LICENSE-2.0
      8  *
      9  * Unless required by applicable law or agreed to in writing, software distributed under the
     10  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     11  * KIND, either express or implied. See the License for the specific language governing
     12  * permissions and limitations under the License.
     13  */
     14 
     15 package com.android.systemui.tuner;
     16 
     17 import android.content.Context;
     18 import android.util.AttributeSet;
     19 import android.view.MotionEvent;
     20 
     21 import com.android.systemui.statusbar.phone.NavigationBarInflaterView;
     22 
     23 public class PreviewNavInflater extends NavigationBarInflaterView {
     24 
     25     public PreviewNavInflater(Context context, AttributeSet attrs) {
     26         super(context, attrs);
     27     }
     28 
     29     @Override
     30     protected void onAttachedToWindow() {
     31         super.onAttachedToWindow();
     32         // Immediately remove tuner listening, since this is a preview, all values will be injected
     33         // manually.
     34         TunerService.get(getContext()).removeTunable(this);
     35     }
     36 
     37     @Override
     38     public boolean onInterceptTouchEvent(MotionEvent ev) {
     39         // Only a preview, not interactable.
     40         return true;
     41     }
     42 
     43     @Override
     44     public void onTuningChanged(String key, String newValue) {
     45         if (NAV_BAR_VIEWS.equals(key)) {
     46             // Since this is a preview we might get a bunch of random stuff, validate before sending
     47             // for inflation.
     48             if (isValidLayout(newValue)) {
     49                 super.onTuningChanged(key, newValue);
     50             }
     51         } else {
     52             super.onTuningChanged(key, newValue);
     53         }
     54     }
     55 
     56     private boolean isValidLayout(String newValue) {
     57         if (newValue == null) {
     58             return true;
     59         }
     60         int separatorCount = 0;
     61         int lastGravitySeparator = 0;
     62         for (int i = 0; i < newValue.length(); i++) {
     63             if (newValue.charAt(i) == GRAVITY_SEPARATOR.charAt(0)) {
     64                 if (i == 0 || (i - lastGravitySeparator) == 1) {
     65                     return false;
     66                 }
     67                 lastGravitySeparator = i;
     68                 separatorCount++;
     69             }
     70         }
     71         return separatorCount == 2 && (newValue.length() - lastGravitySeparator) != 1;
     72     }
     73 }
     74