1/*
2 * Copyright (C) 2006 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 android.widget;
18
19import android.content.Context;
20import android.content.Intent;
21import android.content.IntentFilter;
22import android.content.BroadcastReceiver;
23import android.content.res.Resources;
24import android.content.res.TypedArray;
25import android.graphics.Canvas;
26import android.graphics.drawable.Drawable;
27import android.os.Handler;
28import android.text.format.DateUtils;
29import android.text.format.Time;
30import android.util.AttributeSet;
31import android.view.View;
32import android.widget.RemoteViews.RemoteView;
33
34import java.util.TimeZone;
35
36/**
37 * This widget display an analogic clock with two hands for hours and
38 * minutes.
39 *
40 * @attr ref android.R.styleable#AnalogClock_dial
41 * @attr ref android.R.styleable#AnalogClock_hand_hour
42 * @attr ref android.R.styleable#AnalogClock_hand_minute
43 */
44@RemoteView
45public class AnalogClock extends View {
46    private Time mCalendar;
47
48    private Drawable mHourHand;
49    private Drawable mMinuteHand;
50    private Drawable mDial;
51
52    private int mDialWidth;
53    private int mDialHeight;
54
55    private boolean mAttached;
56
57    private final Handler mHandler = new Handler();
58    private float mMinutes;
59    private float mHour;
60    private boolean mChanged;
61
62    public AnalogClock(Context context) {
63        this(context, null);
64    }
65
66    public AnalogClock(Context context, AttributeSet attrs) {
67        this(context, attrs, 0);
68    }
69
70    public AnalogClock(Context context, AttributeSet attrs,
71                       int defStyle) {
72        super(context, attrs, defStyle);
73        Resources r = mContext.getResources();
74        TypedArray a =
75                context.obtainStyledAttributes(
76                        attrs, com.android.internal.R.styleable.AnalogClock, defStyle, 0);
77
78        mDial = a.getDrawable(com.android.internal.R.styleable.AnalogClock_dial);
79        if (mDial == null) {
80            mDial = r.getDrawable(com.android.internal.R.drawable.clock_dial);
81        }
82
83        mHourHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_hour);
84        if (mHourHand == null) {
85            mHourHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_hour);
86        }
87
88        mMinuteHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_minute);
89        if (mMinuteHand == null) {
90            mMinuteHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_minute);
91        }
92
93        mCalendar = new Time();
94
95        mDialWidth = mDial.getIntrinsicWidth();
96        mDialHeight = mDial.getIntrinsicHeight();
97    }
98
99    @Override
100    protected void onAttachedToWindow() {
101        super.onAttachedToWindow();
102
103        if (!mAttached) {
104            mAttached = true;
105            IntentFilter filter = new IntentFilter();
106
107            filter.addAction(Intent.ACTION_TIME_TICK);
108            filter.addAction(Intent.ACTION_TIME_CHANGED);
109            filter.addAction(Intent.ACTION_TIMEZONE_CHANGED);
110
111            getContext().registerReceiver(mIntentReceiver, filter, null, mHandler);
112        }
113
114        // NOTE: It's safe to do these after registering the receiver since the receiver always runs
115        // in the main thread, therefore the receiver can't run before this method returns.
116
117        // The time zone may have changed while the receiver wasn't registered, so update the Time
118        mCalendar = new Time();
119
120        // Make sure we update to the current time
121        onTimeChanged();
122    }
123
124    @Override
125    protected void onDetachedFromWindow() {
126        super.onDetachedFromWindow();
127        if (mAttached) {
128            getContext().unregisterReceiver(mIntentReceiver);
129            mAttached = false;
130        }
131    }
132
133    @Override
134    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
135
136        int widthMode = MeasureSpec.getMode(widthMeasureSpec);
137        int widthSize =  MeasureSpec.getSize(widthMeasureSpec);
138        int heightMode = MeasureSpec.getMode(heightMeasureSpec);
139        int heightSize =  MeasureSpec.getSize(heightMeasureSpec);
140
141        float hScale = 1.0f;
142        float vScale = 1.0f;
143
144        if (widthMode != MeasureSpec.UNSPECIFIED && widthSize < mDialWidth) {
145            hScale = (float) widthSize / (float) mDialWidth;
146        }
147
148        if (heightMode != MeasureSpec.UNSPECIFIED && heightSize < mDialHeight) {
149            vScale = (float )heightSize / (float) mDialHeight;
150        }
151
152        float scale = Math.min(hScale, vScale);
153
154        setMeasuredDimension(resolveSizeAndState((int) (mDialWidth * scale), widthMeasureSpec, 0),
155                resolveSizeAndState((int) (mDialHeight * scale), heightMeasureSpec, 0));
156    }
157
158    @Override
159    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
160        super.onSizeChanged(w, h, oldw, oldh);
161        mChanged = true;
162    }
163
164    @Override
165    protected void onDraw(Canvas canvas) {
166        super.onDraw(canvas);
167
168        boolean changed = mChanged;
169        if (changed) {
170            mChanged = false;
171        }
172
173        int availableWidth = mRight - mLeft;
174        int availableHeight = mBottom - mTop;
175
176        int x = availableWidth / 2;
177        int y = availableHeight / 2;
178
179        final Drawable dial = mDial;
180        int w = dial.getIntrinsicWidth();
181        int h = dial.getIntrinsicHeight();
182
183        boolean scaled = false;
184
185        if (availableWidth < w || availableHeight < h) {
186            scaled = true;
187            float scale = Math.min((float) availableWidth / (float) w,
188                                   (float) availableHeight / (float) h);
189            canvas.save();
190            canvas.scale(scale, scale, x, y);
191        }
192
193        if (changed) {
194            dial.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
195        }
196        dial.draw(canvas);
197
198        canvas.save();
199        canvas.rotate(mHour / 12.0f * 360.0f, x, y);
200        final Drawable hourHand = mHourHand;
201        if (changed) {
202            w = hourHand.getIntrinsicWidth();
203            h = hourHand.getIntrinsicHeight();
204            hourHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
205        }
206        hourHand.draw(canvas);
207        canvas.restore();
208
209        canvas.save();
210        canvas.rotate(mMinutes / 60.0f * 360.0f, x, y);
211
212        final Drawable minuteHand = mMinuteHand;
213        if (changed) {
214            w = minuteHand.getIntrinsicWidth();
215            h = minuteHand.getIntrinsicHeight();
216            minuteHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2));
217        }
218        minuteHand.draw(canvas);
219        canvas.restore();
220
221        if (scaled) {
222            canvas.restore();
223        }
224    }
225
226    private void onTimeChanged() {
227        mCalendar.setToNow();
228
229        int hour = mCalendar.hour;
230        int minute = mCalendar.minute;
231        int second = mCalendar.second;
232
233        mMinutes = minute + second / 60.0f;
234        mHour = hour + mMinutes / 60.0f;
235        mChanged = true;
236
237        updateContentDescription(mCalendar);
238    }
239
240    private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() {
241        @Override
242        public void onReceive(Context context, Intent intent) {
243            if (intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED)) {
244                String tz = intent.getStringExtra("time-zone");
245                mCalendar = new Time(TimeZone.getTimeZone(tz).getID());
246            }
247
248            onTimeChanged();
249
250            invalidate();
251        }
252    };
253
254    private void updateContentDescription(Time time) {
255        final int flags = DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_24HOUR;
256        String contentDescription = DateUtils.formatDateTime(mContext,
257                time.toMillis(false), flags);
258        setContentDescription(contentDescription);
259    }
260}
261