The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | |
| 17 | package android.widget; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.content.Intent; |
| 21 | import android.content.IntentFilter; |
| 22 | import android.content.BroadcastReceiver; |
| 23 | import android.content.res.Resources; |
| 24 | import android.content.res.TypedArray; |
| 25 | import android.graphics.Canvas; |
| 26 | import android.graphics.drawable.Drawable; |
| 27 | import android.os.Handler; |
| 28 | import android.text.format.Time; |
| 29 | import android.util.AttributeSet; |
| 30 | import android.view.View; |
| 31 | import android.widget.RemoteViews.RemoteView; |
| 32 | |
| 33 | import java.util.TimeZone; |
| 34 | |
| 35 | /** |
| 36 | * This widget display an analogic clock with two hands for hours and |
| 37 | * minutes. |
| 38 | */ |
| 39 | @RemoteView |
| 40 | public class AnalogClock extends View { |
| 41 | private Time mCalendar; |
| 42 | |
| 43 | private Drawable mHourHand; |
| 44 | private Drawable mMinuteHand; |
| 45 | private Drawable mDial; |
| 46 | |
| 47 | private int mDialWidth; |
| 48 | private int mDialHeight; |
| 49 | |
| 50 | private boolean mAttached; |
| 51 | |
| 52 | private final Handler mHandler = new Handler(); |
| 53 | private float mMinutes; |
| 54 | private float mHour; |
| 55 | private boolean mChanged; |
| 56 | |
| 57 | public AnalogClock(Context context) { |
| 58 | this(context, null); |
| 59 | } |
| 60 | |
| 61 | public AnalogClock(Context context, AttributeSet attrs) { |
| 62 | this(context, attrs, 0); |
| 63 | } |
| 64 | |
| 65 | public AnalogClock(Context context, AttributeSet attrs, |
| 66 | int defStyle) { |
| 67 | super(context, attrs, defStyle); |
| 68 | Resources r = mContext.getResources(); |
| 69 | TypedArray a = |
| 70 | context.obtainStyledAttributes( |
| 71 | attrs, com.android.internal.R.styleable.AnalogClock, defStyle, 0); |
| 72 | |
| 73 | mDial = a.getDrawable(com.android.internal.R.styleable.AnalogClock_dial); |
| 74 | if (mDial == null) { |
| 75 | mDial = r.getDrawable(com.android.internal.R.drawable.clock_dial); |
| 76 | } |
| 77 | |
| 78 | mHourHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_hour); |
| 79 | if (mHourHand == null) { |
| 80 | mHourHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_hour); |
| 81 | } |
| 82 | |
| 83 | mMinuteHand = a.getDrawable(com.android.internal.R.styleable.AnalogClock_hand_minute); |
| 84 | if (mMinuteHand == null) { |
| 85 | mMinuteHand = r.getDrawable(com.android.internal.R.drawable.clock_hand_minute); |
| 86 | } |
| 87 | |
| 88 | mCalendar = new Time(); |
| 89 | |
| 90 | mDialWidth = mDial.getIntrinsicWidth(); |
| 91 | mDialHeight = mDial.getIntrinsicHeight(); |
| 92 | } |
| 93 | |
| 94 | @Override |
| 95 | protected void onAttachedToWindow() { |
| 96 | super.onAttachedToWindow(); |
| 97 | |
| 98 | if (!mAttached) { |
| 99 | mAttached = true; |
| 100 | IntentFilter filter = new IntentFilter(); |
| 101 | |
| 102 | filter.addAction(Intent.ACTION_TIME_TICK); |
| 103 | filter.addAction(Intent.ACTION_TIME_CHANGED); |
| 104 | filter.addAction(Intent.ACTION_TIMEZONE_CHANGED); |
| 105 | |
| 106 | getContext().registerReceiver(mIntentReceiver, filter, null, mHandler); |
| 107 | } |
| 108 | |
| 109 | // NOTE: It's safe to do these after registering the receiver since the receiver always runs |
| 110 | // in the main thread, therefore the receiver can't run before this method returns. |
| 111 | |
| 112 | // The time zone may have changed while the receiver wasn't registered, so update the Time |
| 113 | mCalendar = new Time(); |
| 114 | |
| 115 | // Make sure we update to the current time |
| 116 | onTimeChanged(); |
| 117 | } |
| 118 | |
| 119 | @Override |
| 120 | protected void onDetachedFromWindow() { |
| 121 | super.onDetachedFromWindow(); |
| 122 | if (mAttached) { |
| 123 | getContext().unregisterReceiver(mIntentReceiver); |
| 124 | mAttached = false; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | @Override |
| 129 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { |
| 130 | |
| 131 | int widthMode = MeasureSpec.getMode(widthMeasureSpec); |
| 132 | int widthSize = MeasureSpec.getSize(widthMeasureSpec); |
| 133 | int heightMode = MeasureSpec.getMode(heightMeasureSpec); |
| 134 | int heightSize = MeasureSpec.getSize(heightMeasureSpec); |
| 135 | |
| 136 | float hScale = 1.0f; |
| 137 | float vScale = 1.0f; |
| 138 | |
| 139 | if (widthMode != MeasureSpec.UNSPECIFIED && widthSize < mDialWidth) { |
| 140 | hScale = (float) widthSize / (float) mDialWidth; |
| 141 | } |
| 142 | |
| 143 | if (heightMode != MeasureSpec.UNSPECIFIED && heightSize < mDialHeight) { |
| 144 | vScale = (float )heightSize / (float) mDialHeight; |
| 145 | } |
| 146 | |
| 147 | float scale = Math.min(hScale, vScale); |
| 148 | |
| 149 | setMeasuredDimension(resolveSize((int) (mDialWidth * scale), widthMeasureSpec), |
| 150 | resolveSize((int) (mDialHeight * scale), heightMeasureSpec)); |
| 151 | } |
| 152 | |
| 153 | @Override |
| 154 | protected void onSizeChanged(int w, int h, int oldw, int oldh) { |
| 155 | super.onSizeChanged(w, h, oldw, oldh); |
| 156 | mChanged = true; |
| 157 | } |
| 158 | |
| 159 | @Override |
| 160 | protected void onDraw(Canvas canvas) { |
| 161 | super.onDraw(canvas); |
| 162 | |
| 163 | boolean changed = mChanged; |
| 164 | if (changed) { |
| 165 | mChanged = false; |
| 166 | } |
| 167 | |
| 168 | int availableWidth = mRight - mLeft; |
| 169 | int availableHeight = mBottom - mTop; |
| 170 | |
| 171 | int x = availableWidth / 2; |
| 172 | int y = availableHeight / 2; |
| 173 | |
| 174 | final Drawable dial = mDial; |
| 175 | int w = dial.getIntrinsicWidth(); |
| 176 | int h = dial.getIntrinsicHeight(); |
| 177 | |
| 178 | boolean scaled = false; |
| 179 | |
| 180 | if (availableWidth < w || availableHeight < h) { |
| 181 | scaled = true; |
| 182 | float scale = Math.min((float) availableWidth / (float) w, |
| 183 | (float) availableHeight / (float) h); |
| 184 | canvas.save(); |
| 185 | canvas.scale(scale, scale, x, y); |
| 186 | } |
| 187 | |
| 188 | if (changed) { |
| 189 | dial.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2)); |
| 190 | } |
| 191 | dial.draw(canvas); |
| 192 | |
| 193 | canvas.save(); |
| 194 | canvas.rotate(mHour / 12.0f * 360.0f, x, y); |
| 195 | final Drawable hourHand = mHourHand; |
| 196 | if (changed) { |
| 197 | w = hourHand.getIntrinsicWidth(); |
| 198 | h = hourHand.getIntrinsicHeight(); |
| 199 | hourHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2)); |
| 200 | } |
| 201 | hourHand.draw(canvas); |
| 202 | canvas.restore(); |
| 203 | |
| 204 | canvas.save(); |
| 205 | canvas.rotate(mMinutes / 60.0f * 360.0f, x, y); |
| 206 | |
| 207 | final Drawable minuteHand = mMinuteHand; |
| 208 | if (changed) { |
| 209 | w = minuteHand.getIntrinsicWidth(); |
| 210 | h = minuteHand.getIntrinsicHeight(); |
| 211 | minuteHand.setBounds(x - (w / 2), y - (h / 2), x + (w / 2), y + (h / 2)); |
| 212 | } |
| 213 | minuteHand.draw(canvas); |
| 214 | canvas.restore(); |
| 215 | |
| 216 | if (scaled) { |
| 217 | canvas.restore(); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | private void onTimeChanged() { |
| 222 | mCalendar.setToNow(); |
| 223 | |
| 224 | int hour = mCalendar.hour; |
| 225 | int minute = mCalendar.minute; |
| 226 | int second = mCalendar.second; |
| 227 | |
| 228 | mMinutes = minute + second / 60.0f; |
| 229 | mHour = hour + mMinutes / 60.0f; |
| 230 | mChanged = true; |
| 231 | } |
| 232 | |
| 233 | private final BroadcastReceiver mIntentReceiver = new BroadcastReceiver() { |
| 234 | @Override |
| 235 | public void onReceive(Context context, Intent intent) { |
| 236 | if (intent.getAction().equals(Intent.ACTION_TIMEZONE_CHANGED)) { |
| 237 | String tz = intent.getStringExtra("time-zone"); |
| 238 | mCalendar = new Time(TimeZone.getTimeZone(tz).getID()); |
| 239 | } |
| 240 | |
| 241 | onTimeChanged(); |
| 242 | |
| 243 | invalidate(); |
| 244 | } |
| 245 | }; |
| 246 | } |