RotateDrawable.java revision 731ba6649a40529657aa68f93e6febe7d98b4f3b
1/* 2 * Copyright (C) 2007 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.graphics.drawable; 18 19import org.xmlpull.v1.XmlPullParser; 20import org.xmlpull.v1.XmlPullParserException; 21 22import android.graphics.Canvas; 23import android.graphics.ColorFilter; 24import android.graphics.Rect; 25import android.content.res.Resources; 26import android.content.res.TypedArray; 27import android.util.TypedValue; 28import android.util.AttributeSet; 29import android.util.Log; 30 31import java.io.IOException; 32 33/** 34 * <p>A Drawable that can rotate another Drawable based on the current level 35 * value. The start and end angles of rotation can be controlled to map any 36 * circular arc to the level values range.</p> 37 * 38 * <p>It can be defined in an XML file with the <code><rotate></code> element. For more 39 * information, see the guide to <a 40 * href="{@docRoot}guide/topics/resources/animation-resource.html">Animation Resources</a>.</p> 41 * 42 * @attr ref android.R.styleable#RotateDrawable_visible 43 * @attr ref android.R.styleable#RotateDrawable_fromDegrees 44 * @attr ref android.R.styleable#RotateDrawable_toDegrees 45 * @attr ref android.R.styleable#RotateDrawable_pivotX 46 * @attr ref android.R.styleable#RotateDrawable_pivotY 47 * @attr ref android.R.styleable#RotateDrawable_drawable 48 */ 49public class RotateDrawable extends Drawable implements Drawable.Callback { 50 private static final float MAX_LEVEL = 10000.0f; 51 52 private RotateState mState; 53 private boolean mMutated; 54 55 /** 56 * <p>Create a new rotating drawable with an empty state.</p> 57 */ 58 public RotateDrawable() { 59 this(null, null); 60 } 61 62 /** 63 * <p>Create a new rotating drawable with the specified state. A copy of 64 * this state is used as the internal state for the newly created 65 * drawable.</p> 66 * 67 * @param rotateState the state for this drawable 68 */ 69 private RotateDrawable(RotateState rotateState, Resources res) { 70 mState = new RotateState(rotateState, this, res); 71 } 72 73 public void draw(Canvas canvas) { 74 int saveCount = canvas.save(); 75 76 Rect bounds = mState.mDrawable.getBounds(); 77 78 int w = bounds.right - bounds.left; 79 int h = bounds.bottom - bounds.top; 80 81 final RotateState st = mState; 82 83 float px = st.mPivotXRel ? (w * st.mPivotX) : st.mPivotX; 84 float py = st.mPivotYRel ? (h * st.mPivotY) : st.mPivotY; 85 86 canvas.rotate(st.mCurrentDegrees, px + bounds.left, py + bounds.top); 87 88 st.mDrawable.draw(canvas); 89 90 canvas.restoreToCount(saveCount); 91 } 92 93 /** 94 * Returns the drawable rotated by this RotateDrawable. 95 */ 96 public Drawable getDrawable() { 97 return mState.mDrawable; 98 } 99 100 @Override 101 public int getChangingConfigurations() { 102 return super.getChangingConfigurations() 103 | mState.mChangingConfigurations 104 | mState.mDrawable.getChangingConfigurations(); 105 } 106 107 public void setAlpha(int alpha) { 108 mState.mDrawable.setAlpha(alpha); 109 } 110 111 public void setColorFilter(ColorFilter cf) { 112 mState.mDrawable.setColorFilter(cf); 113 } 114 115 public int getOpacity() { 116 return mState.mDrawable.getOpacity(); 117 } 118 119 public void invalidateDrawable(Drawable who) { 120 final Callback callback = getCallback(); 121 if (callback != null) { 122 callback.invalidateDrawable(this); 123 } 124 } 125 126 public void scheduleDrawable(Drawable who, Runnable what, long when) { 127 final Callback callback = getCallback(); 128 if (callback != null) { 129 callback.scheduleDrawable(this, what, when); 130 } 131 } 132 133 public void unscheduleDrawable(Drawable who, Runnable what) { 134 final Callback callback = getCallback(); 135 if (callback != null) { 136 callback.unscheduleDrawable(this, what); 137 } 138 } 139 140 @Override 141 public boolean getPadding(Rect padding) { 142 return mState.mDrawable.getPadding(padding); 143 } 144 145 @Override 146 public boolean setVisible(boolean visible, boolean restart) { 147 mState.mDrawable.setVisible(visible, restart); 148 return super.setVisible(visible, restart); 149 } 150 151 @Override 152 public boolean isStateful() { 153 return mState.mDrawable.isStateful(); 154 } 155 156 @Override 157 protected boolean onStateChange(int[] state) { 158 boolean changed = mState.mDrawable.setState(state); 159 onBoundsChange(getBounds()); 160 return changed; 161 } 162 163 @Override 164 protected boolean onLevelChange(int level) { 165 mState.mDrawable.setLevel(level); 166 onBoundsChange(getBounds()); 167 168 mState.mCurrentDegrees = mState.mFromDegrees + 169 (mState.mToDegrees - mState.mFromDegrees) * 170 ((float) level / MAX_LEVEL); 171 172 invalidateSelf(); 173 return true; 174 } 175 176 @Override 177 protected void onBoundsChange(Rect bounds) { 178 mState.mDrawable.setBounds(bounds.left, bounds.top, 179 bounds.right, bounds.bottom); 180 } 181 182 @Override 183 public int getIntrinsicWidth() { 184 return mState.mDrawable.getIntrinsicWidth(); 185 } 186 187 @Override 188 public int getIntrinsicHeight() { 189 return mState.mDrawable.getIntrinsicHeight(); 190 } 191 192 @Override 193 public ConstantState getConstantState() { 194 if (mState.canConstantState()) { 195 mState.mChangingConfigurations = getChangingConfigurations(); 196 return mState; 197 } 198 return null; 199 } 200 201 @Override 202 public void inflate(Resources r, XmlPullParser parser, AttributeSet attrs) 203 throws XmlPullParserException, IOException { 204 205 TypedArray a = r.obtainAttributes(attrs, 206 com.android.internal.R.styleable.RotateDrawable); 207 208 super.inflateWithAttributes(r, parser, a, 209 com.android.internal.R.styleable.RotateDrawable_visible); 210 211 TypedValue tv = a.peekValue(com.android.internal.R.styleable.RotateDrawable_pivotX); 212 boolean pivotXRel; 213 float pivotX; 214 if (tv == null) { 215 pivotXRel = true; 216 pivotX = 0.5f; 217 } else { 218 pivotXRel = tv.type == TypedValue.TYPE_FRACTION; 219 pivotX = pivotXRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat(); 220 } 221 222 tv = a.peekValue(com.android.internal.R.styleable.RotateDrawable_pivotY); 223 boolean pivotYRel; 224 float pivotY; 225 if (tv == null) { 226 pivotYRel = true; 227 pivotY = 0.5f; 228 } else { 229 pivotYRel = tv.type == TypedValue.TYPE_FRACTION; 230 pivotY = pivotYRel ? tv.getFraction(1.0f, 1.0f) : tv.getFloat(); 231 } 232 233 float fromDegrees = a.getFloat( 234 com.android.internal.R.styleable.RotateDrawable_fromDegrees, 0.0f); 235 float toDegrees = a.getFloat( 236 com.android.internal.R.styleable.RotateDrawable_toDegrees, 360.0f); 237 238 int res = a.getResourceId( 239 com.android.internal.R.styleable.RotateDrawable_drawable, 0); 240 Drawable drawable = null; 241 if (res > 0) { 242 drawable = r.getDrawable(res); 243 } 244 245 a.recycle(); 246 247 int outerDepth = parser.getDepth(); 248 int type; 249 while ((type = parser.next()) != XmlPullParser.END_DOCUMENT && 250 (type != XmlPullParser.END_TAG || parser.getDepth() > outerDepth)) { 251 252 if (type != XmlPullParser.START_TAG) { 253 continue; 254 } 255 256 if ((drawable = Drawable.createFromXmlInner(r, parser, attrs)) == null) { 257 Log.w("drawable", "Bad element under <rotate>: " 258 + parser .getName()); 259 } 260 } 261 262 if (drawable == null) { 263 Log.w("drawable", "No drawable specified for <rotate>"); 264 } 265 266 mState.mDrawable = drawable; 267 mState.mPivotXRel = pivotXRel; 268 mState.mPivotX = pivotX; 269 mState.mPivotYRel = pivotYRel; 270 mState.mPivotY = pivotY; 271 mState.mFromDegrees = mState.mCurrentDegrees = fromDegrees; 272 mState.mToDegrees = toDegrees; 273 274 if (drawable != null) { 275 drawable.setCallback(this); 276 } 277 } 278 279 @Override 280 public Drawable mutate() { 281 if (!mMutated && super.mutate() == this) { 282 mState.mDrawable.mutate(); 283 mMutated = true; 284 } 285 return this; 286 } 287 288 /** 289 * <p>Represents the state of a rotation for a given drawable. The same 290 * rotate drawable can be invoked with different states to drive several 291 * rotations at the same time.</p> 292 */ 293 final static class RotateState extends Drawable.ConstantState { 294 Drawable mDrawable; 295 296 int mChangingConfigurations; 297 298 boolean mPivotXRel; 299 float mPivotX; 300 boolean mPivotYRel; 301 float mPivotY; 302 303 float mFromDegrees; 304 float mToDegrees; 305 306 float mCurrentDegrees; 307 308 private boolean mCanConstantState; 309 private boolean mCheckedConstantState; 310 311 public RotateState(RotateState source, RotateDrawable owner, Resources res) { 312 if (source != null) { 313 if (res != null) { 314 mDrawable = source.mDrawable.getConstantState().newDrawable(res); 315 } else { 316 mDrawable = source.mDrawable.getConstantState().newDrawable(); 317 } 318 mDrawable.setCallback(owner); 319 mDrawable.setLayoutDirection(source.mDrawable.getLayoutDirection()); 320 mPivotXRel = source.mPivotXRel; 321 mPivotX = source.mPivotX; 322 mPivotYRel = source.mPivotYRel; 323 mPivotY = source.mPivotY; 324 mFromDegrees = mCurrentDegrees = source.mFromDegrees; 325 mToDegrees = source.mToDegrees; 326 mCanConstantState = mCheckedConstantState = true; 327 } 328 } 329 330 @Override 331 public Drawable newDrawable() { 332 return new RotateDrawable(this, null); 333 } 334 335 @Override 336 public Drawable newDrawable(Resources res) { 337 return new RotateDrawable(this, res); 338 } 339 340 @Override 341 public int getChangingConfigurations() { 342 return mChangingConfigurations; 343 } 344 345 public boolean canConstantState() { 346 if (!mCheckedConstantState) { 347 mCanConstantState = mDrawable.getConstantState() != null; 348 mCheckedConstantState = true; 349 } 350 351 return mCanConstantState; 352 } 353 } 354} 355