DateView.java revision 46b369f09e7f0a9873a77312fdf49de937b97e69 
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
17package com.android.systemui.statusbar.policy;
18
19import android.content.BroadcastReceiver;
20import android.content.Context;
21import android.content.Intent;
22import android.content.IntentFilter;
23import android.text.format.DateFormat;
24import android.util.AttributeSet;
25import android.view.View;
26import android.view.ViewParent;
27import android.widget.TextView;
28
29import com.android.systemui.R;
30
31import java.util.Date;
32
33public final class DateView extends TextView {
34    private static final String TAG = "DateView";
35
36    private boolean mAttachedToWindow;
37    private boolean mWindowVisible;
38    private boolean mUpdating;
39
40    private BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
41        @Override
42        public void onReceive(Context context, Intent intent) {
43            final String action = intent.getAction();
44            if (Intent.ACTION_TIME_TICK.equals(action)
45                    || Intent.ACTION_TIME_CHANGED.equals(action)
46                    || Intent.ACTION_TIMEZONE_CHANGED.equals(action)
47                    || Intent.ACTION_LOCALE_CHANGED.equals(action)) {
48                updateClock();
49            }
50        }
51    };
52
53    public DateView(Context context, AttributeSet attrs) {
54        super(context, attrs);
55    }
56
57    @Override
58    protected void onAttachedToWindow() {
59        super.onAttachedToWindow();
60        mAttachedToWindow = true;
61        setUpdates();
62    }
63
64    @Override
65    protected void onDetachedFromWindow() {
66        super.onDetachedFromWindow();
67        mAttachedToWindow = false;
68        setUpdates();
69    }
70
71    @Override
72    protected void onWindowVisibilityChanged(int visibility) {
73        super.onWindowVisibilityChanged(visibility);
74        mWindowVisible = visibility == VISIBLE;
75        setUpdates();
76    }
77
78    @Override
79    protected void onVisibilityChanged(View changedView, int visibility) {
80        super.onVisibilityChanged(changedView, visibility);
81        setUpdates();
82    }
83
84    @Override
85    protected int getSuggestedMinimumWidth() {
86        // makes the large background bitmap not force us to full width
87        return 0;
88    }
89
90    private final void updateClock() {
91        final Context context = getContext();
92        Date now = new Date();
93        CharSequence dow = DateFormat.format("EEEE", now);
94        CharSequence date = DateFormat.getLongDateFormat(context).format(now);
95        setText(context.getString(R.string.status_bar_date_formatter, dow, date));
96    }
97
98    private boolean isVisible() {
99        View v = this;
100        while (true) {
101            if (v.getVisibility() != VISIBLE) {
102                return false;
103            }
104            final ViewParent parent = v.getParent();
105            if (parent instanceof View) {
106                v = (View)parent;
107            } else {
108                return true;
109            }
110        }
111    }
112
113    private void setUpdates() {
114        boolean update = mAttachedToWindow && mWindowVisible && isVisible();
115        if (update != mUpdating) {
116            mUpdating = update;
117            if (update) {
118                // Register for Intent broadcasts for the clock and battery
119                IntentFilter filter = new IntentFilter();
120                filter.addAction(Intent.ACTION_TIME_TICK);
121                filter.addAction(Intent.ACTION_TIME_CHANGED);
122                filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
123                filter.addAction(Intent.ACTION_LOCALE_CHANGED);
124                mContext.registerReceiver(mIntentReceiver, filter, null, null);
125                updateClock();
126            } else {
127                mContext.unregisterReceiver(mIntentReceiver);
128            }
129        }
130    }
131}
132