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 android.graphics.drawable; 18 19import org.xmlpull.v1.XmlPullParser; 20import org.xmlpull.v1.XmlPullParserException; 21 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.*; 25import android.util.AttributeSet; 26import android.util.Log; 27 28import java.io.IOException; 29 30/** 31 * A Drawable that insets another Drawable by a specified distance. 32 * This is used when a View needs a background that is smaller than 33 * the View's actual bounds. 34 * 35 * <p>It can be defined in an XML file with the <code><inset></code> element. For more 36 * information, see the guide to <a 37 * href="{@docRoot}guide/topics/resources/drawable-resource.html">Drawable Resources</a>.</p> 38 * 39 * @attr ref android.R.styleable#InsetDrawable_visible 40 * @attr ref android.R.styleable#InsetDrawable_drawable 41 * @attr ref android.R.styleable#InsetDrawable_insetLeft 42 * @attr ref android.R.styleable#InsetDrawable_insetRight 43 * @attr ref android.R.styleable#InsetDrawable_insetTop 44 * @attr ref android.R.styleable#InsetDrawable_insetBottom 45 */ 46public class InsetDrawable extends Drawable implements Drawable.Callback 47{ 48 // Most of this is copied from ScaleDrawable. 49 private InsetState mInsetState; 50 private final Rect mTmpRect = new Rect(); 51 private boolean mMutated; 52 53 /*package*/ InsetDrawable() { 54 this(null, null); 55 } 56 57 public InsetDrawable(Drawable drawable, int inset) { 58 this(drawable, inset, inset, inset, inset); 59 } 60 61 public InsetDrawable(Drawable drawable, int insetLeft, int insetTop, 62 int insetRight, int insetBottom) { 63 this(null, null); 64 65 mInsetState.mDrawable = drawable; 66 mInsetState.mInsetLeft = insetLeft; 67 mInsetState.mInsetTop = insetTop; 68 mInsetState.mInsetRight = insetRight; 69 mInsetState.mInsetBottom = insetBottom; 70 71 if (drawable != null) { 72 drawable.setCallback(this); 73 } 74 } 75 76 @Override public void inflate(Resources r, XmlPullParser parser, 77 AttributeSet attrs) 78 throws XmlPullParserException, IOException { 79 int type; 80 81 TypedArray a = r.obtainAttributes(attrs, 82 com.android.internal.R.styleable.InsetDrawable); 83 84 super.inflateWithAttributes(r, parser, a, 85 com.android.internal.R.styleable.InsetDrawable_visible); 86 87 int drawableRes = a.getResourceId(com.android.internal.R.styleable. 88 InsetDrawable_drawable, 0); 89 90 int inLeft = a.getDimensionPixelOffset(com.android.internal.R.styleable. 91 InsetDrawable_insetLeft, 0); 92 int inTop = a.getDimensionPixelOffset(com.android.internal.R.styleable. 93 InsetDrawable_insetTop, 0); 94 int inRight = a.getDimensionPixelOffset(com.android.internal.R.styleable. 95 InsetDrawable_insetRight, 0); 96 int inBottom = a.getDimensionPixelOffset(com.android.internal.R.styleable. 97 InsetDrawable_insetBottom, 0); 98 99 a.recycle(); 100 101 Drawable dr; 102 if (drawableRes != 0) { 103 dr = r.getDrawable(drawableRes); 104 } else { 105 while ((type=parser.next()) == XmlPullParser.TEXT) { 106 } 107 if (type != XmlPullParser.START_TAG) { 108 throw new XmlPullParserException( 109 parser.getPositionDescription() 110 + ": <inset> tag requires a 'drawable' attribute or " 111 + "child tag defining a drawable"); 112 } 113 dr = Drawable.createFromXmlInner(r, parser, attrs); 114 } 115 116 if (dr == null) { 117 Log.w("drawable", "No drawable specified for <inset>"); 118 } 119 120 mInsetState.mDrawable = dr; 121 mInsetState.mInsetLeft = inLeft; 122 mInsetState.mInsetRight = inRight; 123 mInsetState.mInsetTop = inTop; 124 mInsetState.mInsetBottom = inBottom; 125 126 if (dr != null) { 127 dr.setCallback(this); 128 } 129 } 130 131 // overrides from Drawable.Callback 132 133 public void invalidateDrawable(Drawable who) { 134 if (mCallback != null) { 135 mCallback.invalidateDrawable(this); 136 } 137 } 138 139 public void scheduleDrawable(Drawable who, Runnable what, long when) { 140 if (mCallback != null) { 141 mCallback.scheduleDrawable(this, what, when); 142 } 143 } 144 145 public void unscheduleDrawable(Drawable who, Runnable what) { 146 if (mCallback != null) { 147 mCallback.unscheduleDrawable(this, what); 148 } 149 } 150 151 // overrides from Drawable 152 153 @Override 154 public void draw(Canvas canvas) { 155 mInsetState.mDrawable.draw(canvas); 156 } 157 158 @Override 159 public int getChangingConfigurations() { 160 return super.getChangingConfigurations() 161 | mInsetState.mChangingConfigurations 162 | mInsetState.mDrawable.getChangingConfigurations(); 163 } 164 165 @Override 166 public boolean getPadding(Rect padding) { 167 boolean pad = mInsetState.mDrawable.getPadding(padding); 168 169 padding.left += mInsetState.mInsetLeft; 170 padding.right += mInsetState.mInsetRight; 171 padding.top += mInsetState.mInsetTop; 172 padding.bottom += mInsetState.mInsetBottom; 173 174 if (pad || (mInsetState.mInsetLeft | mInsetState.mInsetRight | 175 mInsetState.mInsetTop | mInsetState.mInsetBottom) != 0) { 176 return true; 177 } else { 178 return false; 179 } 180 } 181 182 @Override 183 public boolean setVisible(boolean visible, boolean restart) { 184 mInsetState.mDrawable.setVisible(visible, restart); 185 return super.setVisible(visible, restart); 186 } 187 188 @Override 189 public void setAlpha(int alpha) { 190 mInsetState.mDrawable.setAlpha(alpha); 191 } 192 193 @Override 194 public void setColorFilter(ColorFilter cf) { 195 mInsetState.mDrawable.setColorFilter(cf); 196 } 197 198 @Override 199 public int getOpacity() { 200 return mInsetState.mDrawable.getOpacity(); 201 } 202 203 @Override 204 public boolean isStateful() { 205 return mInsetState.mDrawable.isStateful(); 206 } 207 208 @Override 209 protected boolean onStateChange(int[] state) { 210 boolean changed = mInsetState.mDrawable.setState(state); 211 onBoundsChange(getBounds()); 212 return changed; 213 } 214 215 @Override 216 protected void onBoundsChange(Rect bounds) { 217 final Rect r = mTmpRect; 218 r.set(bounds); 219 220 r.left += mInsetState.mInsetLeft; 221 r.top += mInsetState.mInsetTop; 222 r.right -= mInsetState.mInsetRight; 223 r.bottom -= mInsetState.mInsetBottom; 224 225 mInsetState.mDrawable.setBounds(r.left, r.top, r.right, r.bottom); 226 } 227 228 @Override 229 public int getIntrinsicWidth() { 230 return mInsetState.mDrawable.getIntrinsicWidth(); 231 } 232 233 @Override 234 public int getIntrinsicHeight() { 235 return mInsetState.mDrawable.getIntrinsicHeight(); 236 } 237 238 @Override 239 public ConstantState getConstantState() { 240 if (mInsetState.canConstantState()) { 241 mInsetState.mChangingConfigurations = super.getChangingConfigurations(); 242 return mInsetState; 243 } 244 return null; 245 } 246 247 @Override 248 public Drawable mutate() { 249 if (!mMutated && super.mutate() == this) { 250 mInsetState.mDrawable.mutate(); 251 mMutated = true; 252 } 253 return this; 254 } 255 256 final static class InsetState extends ConstantState { 257 Drawable mDrawable; 258 int mChangingConfigurations; 259 260 int mInsetLeft; 261 int mInsetTop; 262 int mInsetRight; 263 int mInsetBottom; 264 265 boolean mCheckedConstantState; 266 boolean mCanConstantState; 267 268 InsetState(InsetState orig, InsetDrawable owner, Resources res) { 269 if (orig != null) { 270 if (res != null) { 271 mDrawable = orig.mDrawable.getConstantState().newDrawable(res); 272 } else { 273 mDrawable = orig.mDrawable.getConstantState().newDrawable(); 274 } 275 mDrawable.setCallback(owner); 276 mInsetLeft = orig.mInsetLeft; 277 mInsetTop = orig.mInsetTop; 278 mInsetRight = orig.mInsetRight; 279 mInsetBottom = orig.mInsetBottom; 280 mCheckedConstantState = mCanConstantState = true; 281 } 282 } 283 284 @Override 285 public Drawable newDrawable() { 286 return new InsetDrawable(this, null); 287 } 288 289 @Override 290 public Drawable newDrawable(Resources res) { 291 return new InsetDrawable(this, res); 292 } 293 294 @Override 295 public int getChangingConfigurations() { 296 return mChangingConfigurations; 297 } 298 299 boolean canConstantState() { 300 if (!mCheckedConstantState) { 301 mCanConstantState = mDrawable.getConstantState() != null; 302 mCheckedConstantState = true; 303 } 304 305 return mCanConstantState; 306 } 307 } 308 309 private InsetDrawable(InsetState state, Resources res) { 310 mInsetState = new InsetState(state, this, res); 311 } 312} 313 314