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      1 /*
      2  * Copyright (C) 2008 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.statusbar.policy;
     18 
     19 import android.content.BroadcastReceiver;
     20 import android.content.Context;
     21 import android.content.Intent;
     22 import android.content.IntentFilter;
     23 import android.util.AttributeSet;
     24 import android.view.View;
     25 import android.view.ViewParent;
     26 import android.widget.TextView;
     27 
     28 import com.android.systemui.R;
     29 
     30 import java.text.SimpleDateFormat;
     31 import java.util.Date;
     32 import java.util.Locale;
     33 
     34 import libcore.icu.ICU;
     35 
     36 public class DateView extends TextView {
     37     private static final String TAG = "DateView";
     38 
     39     private boolean mAttachedToWindow;
     40     private boolean mWindowVisible;
     41     private boolean mUpdating;
     42 
     43     private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
     44         @Override
     45         public void onReceive(Context context, Intent intent) {
     46             final String action = intent.getAction();
     47             if (Intent.ACTION_TIME_TICK.equals(action)
     48                     || Intent.ACTION_TIME_CHANGED.equals(action)
     49                     || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
     50                     || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
     51                 updateClock();
     52             }
     53         }
     54     };
     55 
     56     public DateView(Context context, AttributeSet attrs) {
     57         super(context, attrs);
     58     }
     59 
     60     @Override
     61     protected void onAttachedToWindow() {
     62         super.onAttachedToWindow();
     63         mAttachedToWindow = true;
     64         setUpdates();
     65     }
     66 
     67     @Override
     68     protected void onDetachedFromWindow() {
     69         super.onDetachedFromWindow();
     70         mAttachedToWindow = false;
     71         setUpdates();
     72     }
     73 
     74     @Override
     75     protected void onWindowVisibilityChanged(int visibility) {
     76         super.onWindowVisibilityChanged(visibility);
     77         mWindowVisible = visibility == VISIBLE;
     78         setUpdates();
     79     }
     80 
     81     @Override
     82     protected void onVisibilityChanged(View changedView, int visibility) {
     83         super.onVisibilityChanged(changedView, visibility);
     84         setUpdates();
     85     }
     86 
     87     @Override
     88     protected int getSuggestedMinimumWidth() {
     89         // makes the large background bitmap not force us to full width
     90         return 0;
     91     }
     92 
     93     protected void updateClock() {
     94         final String dateFormat = getContext().getString(R.string.system_ui_date_pattern);
     95         final Locale l = Locale.getDefault();
     96         String fmt = ICU.getBestDateTimePattern(dateFormat, l.toString());
     97         SimpleDateFormat sdf = new SimpleDateFormat(fmt, l);
     98         setText(sdf.format(new Date()));
     99     }
    100 
    101     private boolean isVisible() {
    102         View v = this;
    103         while (true) {
    104             if (v.getVisibility() != VISIBLE) {
    105                 return false;
    106             }
    107             final ViewParent parent = v.getParent();
    108             if (parent instanceof View) {
    109                 v = (View)parent;
    110             } else {
    111                 return true;
    112             }
    113         }
    114     }
    115 
    116     private void setUpdates() {
    117         boolean update = mAttachedToWindow && mWindowVisible && isVisible();
    118         if (update != mUpdating) {
    119             mUpdating = update;
    120             if (update) {
    121                 // Register for Intent broadcasts for the clock and battery
    122                 IntentFilter filter = new IntentFilter();
    123                 filter.addAction(Intent.ACTION_TIME_TICK);
    124                 filter.addAction(Intent.ACTION_TIME_CHANGED);
    125                 filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
    126                 filter.addAction(Intent.ACTION_LOCALE_CHANGED);
    127                 mContext.registerReceiver(mIntentReceiver, filter, null, null);
    128                 updateClock();
    129             } else {
    130                 mContext.unregisterReceiver(mIntentReceiver);
    131             }
    132         }
    133     }
    134 }
    135