Home | History | Annotate | Download | only in systemui 
      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;
     16 
     17 import android.annotation.Nullable;
     18 import android.content.Context;
     19 import android.content.res.Configuration;
     20 import android.content.res.TypedArray;
     21 import android.os.LocaleList;
     22 import android.util.AttributeSet;
     23 import android.view.LayoutInflater;
     24 import android.view.View;
     25 import android.widget.FrameLayout;
     26 
     27 import java.util.ArrayList;
     28 import java.util.List;
     29 
     30 /**
     31  * Custom {@link FrameLayout} that re-inflates when changes to {@link Configuration} happen.
     32  * Currently supports changes to density and locale.
     33  */
     34 public class AutoReinflateContainer extends FrameLayout {
     35 
     36     private final List<InflateListener> mInflateListeners = new ArrayList<>();
     37     private final int mLayout;
     38     private int mDensity;
     39     private LocaleList mLocaleList;
     40 
     41     public AutoReinflateContainer(Context context, @Nullable AttributeSet attrs) {
     42         super(context, attrs);
     43 
     44         mDensity = context.getResources().getConfiguration().densityDpi;
     45         mLocaleList = context.getResources().getConfiguration().getLocales();
     46 
     47         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.AutoReinflateContainer);
     48         if (!a.hasValue(R.styleable.AutoReinflateContainer_android_layout)) {
     49             throw new IllegalArgumentException("AutoReinflateContainer must contain a layout");
     50         }
     51         mLayout = a.getResourceId(R.styleable.AutoReinflateContainer_android_layout, 0);
     52         inflateLayout();
     53     }
     54 
     55     @Override
     56     protected void onConfigurationChanged(Configuration newConfig) {
     57         super.onConfigurationChanged(newConfig);
     58         boolean shouldInflateLayout = false;
     59         final int density = newConfig.densityDpi;
     60         if (density != mDensity) {
     61             mDensity = density;
     62             shouldInflateLayout = true;
     63         }
     64         final LocaleList localeList = newConfig.getLocales();
     65         if (localeList != mLocaleList) {
     66             mLocaleList = localeList;
     67             shouldInflateLayout = true;
     68         }
     69 
     70         if (shouldInflateLayout) {
     71             inflateLayout();
     72         }
     73     }
     74 
     75     private void inflateLayout() {
     76         removeAllViews();
     77         LayoutInflater.from(getContext()).inflate(mLayout, this);
     78         final int N = mInflateListeners.size();
     79         for (int i = 0; i < N; i++) {
     80             mInflateListeners.get(i).onInflated(getChildAt(0));
     81         }
     82     }
     83 
     84     public void addInflateListener(InflateListener listener) {
     85         mInflateListeners.add(listener);
     86         listener.onInflated(getChildAt(0));
     87     }
     88 
     89     public interface InflateListener {
     90         /**
     91          * Called whenever a new view is inflated.
     92          */
     93         void onInflated(View v);
     94     }
     95 }
     96