The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 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 | |
| 17 | package android.content.res; |
| 18 | |
| 19 | import com.android.internal.util.ArrayUtils; |
| 20 | |
| 21 | import org.xmlpull.v1.XmlPullParser; |
| 22 | import org.xmlpull.v1.XmlPullParserException; |
| 23 | |
| 24 | import android.util.AttributeSet; |
| 25 | import android.util.SparseArray; |
| 26 | import android.util.StateSet; |
| 27 | import android.util.Xml; |
| 28 | import android.os.Parcel; |
| 29 | import android.os.Parcelable; |
| 30 | |
| 31 | import java.io.IOException; |
| 32 | import java.lang.ref.WeakReference; |
| 33 | import java.util.Arrays; |
| 34 | |
| 35 | /** |
| 36 | * |
| 37 | * Lets you map {@link android.view.View} state sets to colors. |
| 38 | * |
| 39 | * {@link android.content.res.ColorStateList}s are created from XML resource files defined in the |
| 40 | * "color" subdirectory directory of an application's resource directory. The XML file contains |
| 41 | * a single "selector" element with a number of "item" elements inside. For example: |
| 42 | * |
| 43 | * <pre> |
| 44 | * <selector xmlns:android="http://schemas.android.com/apk/res/android"> |
| 45 | * <item android:state_focused="true" android:color="@color/testcolor1"/> |
| 46 | * <item android:state_pressed="true" android:state_enabled="false" android:color="@color/testcolor2" /> |
Romain Guy | 79dc8cc | 2010-01-04 14:45:49 -0800 | [diff] [blame] | 47 | * <item android:state_enabled="false" android:color="@color/testcolor3" /> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 48 | * <item android:color="@color/testcolor5"/> |
| 49 | * </selector> |
| 50 | * </pre> |
| 51 | * |
| 52 | * This defines a set of state spec / color pairs where each state spec specifies a set of |
| 53 | * states that a view must either be in or not be in and the color specifies the color associated |
| 54 | * with that spec. The list of state specs will be processed in order of the items in the XML file. |
| 55 | * An item with no state spec is considered to match any set of states and is generally useful as |
| 56 | * a final item to be used as a default. Note that if you have such an item before any other items |
| 57 | * in the list then any subsequent items will end up being ignored. |
Scott Main | 8dd87ad | 2010-08-04 17:33:33 -0700 | [diff] [blame] | 58 | * <p>For more information, see the guide to <a |
| 59 | * href="{@docRoot}guide/topics/resources/color-list-resource.html">Color State |
| 60 | * List Resource</a>.</p> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 61 | */ |
| 62 | public class ColorStateList implements Parcelable { |
| 63 | |
| 64 | private int[][] mStateSpecs; // must be parallel to mColors |
| 65 | private int[] mColors; // must be parallel to mStateSpecs |
| 66 | private int mDefaultColor = 0xffff0000; |
| 67 | |
| 68 | private static final int[][] EMPTY = new int[][] { new int[0] }; |
| 69 | private static final SparseArray<WeakReference<ColorStateList>> sCache = |
| 70 | new SparseArray<WeakReference<ColorStateList>>(); |
| 71 | |
| 72 | private ColorStateList() { } |
| 73 | |
| 74 | /** |
| 75 | * Creates a ColorStateList that returns the specified mapping from |
| 76 | * states to colors. |
| 77 | */ |
| 78 | public ColorStateList(int[][] states, int[] colors) { |
| 79 | mStateSpecs = states; |
| 80 | mColors = colors; |
| 81 | |
| 82 | if (states.length > 0) { |
| 83 | mDefaultColor = colors[0]; |
| 84 | |
| 85 | for (int i = 0; i < states.length; i++) { |
| 86 | if (states[i].length == 0) { |
| 87 | mDefaultColor = colors[i]; |
| 88 | } |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Creates or retrieves a ColorStateList that always returns a single color. |
| 95 | */ |
| 96 | public static ColorStateList valueOf(int color) { |
| 97 | // TODO: should we collect these eventually? |
| 98 | synchronized (sCache) { |
| 99 | WeakReference<ColorStateList> ref = sCache.get(color); |
| 100 | ColorStateList csl = ref != null ? ref.get() : null; |
| 101 | |
| 102 | if (csl != null) { |
| 103 | return csl; |
| 104 | } |
| 105 | |
| 106 | csl = new ColorStateList(EMPTY, new int[] { color }); |
| 107 | sCache.put(color, new WeakReference<ColorStateList>(csl)); |
| 108 | return csl; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Create a ColorStateList from an XML document, given a set of {@link Resources}. |
| 114 | */ |
| 115 | public static ColorStateList createFromXml(Resources r, XmlPullParser parser) |
| 116 | throws XmlPullParserException, IOException { |
| 117 | |
| 118 | AttributeSet attrs = Xml.asAttributeSet(parser); |
| 119 | |
| 120 | int type; |
| 121 | while ((type=parser.next()) != XmlPullParser.START_TAG |
| 122 | && type != XmlPullParser.END_DOCUMENT) { |
| 123 | } |
| 124 | |
| 125 | if (type != XmlPullParser.START_TAG) { |
| 126 | throw new XmlPullParserException("No start tag found"); |
| 127 | } |
| 128 | |
| 129 | return createFromXmlInner(r, parser, attrs); |
| 130 | } |
| 131 | |
| 132 | /* Create from inside an XML document. Called on a parser positioned at |
| 133 | * a tag in an XML document, tries to create a ColorStateList from that tag. |
| 134 | * Returns null if the tag is not a valid ColorStateList. |
| 135 | */ |
| 136 | private static ColorStateList createFromXmlInner(Resources r, XmlPullParser parser, |
| 137 | AttributeSet attrs) throws XmlPullParserException, IOException { |
| 138 | |
| 139 | ColorStateList colorStateList; |
| 140 | |
| 141 | final String name = parser.getName(); |
| 142 | |
| 143 | if (name.equals("selector")) { |
| 144 | colorStateList = new ColorStateList(); |
| 145 | } else { |
| 146 | throw new XmlPullParserException( |
| 147 | parser.getPositionDescription() + ": invalid drawable tag " + name); |
| 148 | } |
| 149 | |
| 150 | colorStateList.inflate(r, parser, attrs); |
| 151 | return colorStateList; |
| 152 | } |
| 153 | |
| 154 | /** |
| 155 | * Creates a new ColorStateList that has the same states and |
| 156 | * colors as this one but where each color has the specified alpha value |
| 157 | * (0-255). |
| 158 | */ |
| 159 | public ColorStateList withAlpha(int alpha) { |
| 160 | int[] colors = new int[mColors.length]; |
| 161 | |
| 162 | int len = colors.length; |
| 163 | for (int i = 0; i < len; i++) { |
| 164 | colors[i] = (mColors[i] & 0xFFFFFF) | (alpha << 24); |
| 165 | } |
| 166 | |
| 167 | return new ColorStateList(mStateSpecs, colors); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Fill in this object based on the contents of an XML "selector" element. |
| 172 | */ |
| 173 | private void inflate(Resources r, XmlPullParser parser, AttributeSet attrs) |
| 174 | throws XmlPullParserException, IOException { |
| 175 | |
| 176 | int type; |
| 177 | |
| 178 | final int innerDepth = parser.getDepth()+1; |
| 179 | int depth; |
| 180 | |
| 181 | int listAllocated = 20; |
| 182 | int listSize = 0; |
| 183 | int[] colorList = new int[listAllocated]; |
| 184 | int[][] stateSpecList = new int[listAllocated][]; |
| 185 | |
| 186 | while ((type=parser.next()) != XmlPullParser.END_DOCUMENT |
| 187 | && ((depth=parser.getDepth()) >= innerDepth |
| 188 | || type != XmlPullParser.END_TAG)) { |
| 189 | if (type != XmlPullParser.START_TAG) { |
| 190 | continue; |
| 191 | } |
| 192 | |
| 193 | if (depth > innerDepth || !parser.getName().equals("item")) { |
| 194 | continue; |
| 195 | } |
| 196 | |
| 197 | int colorRes = 0; |
| 198 | int color = 0xffff0000; |
| 199 | boolean haveColor = false; |
| 200 | |
| 201 | int i; |
| 202 | int j = 0; |
| 203 | final int numAttrs = attrs.getAttributeCount(); |
| 204 | int[] stateSpec = new int[numAttrs]; |
| 205 | for (i = 0; i < numAttrs; i++) { |
| 206 | final int stateResId = attrs.getAttributeNameResource(i); |
| 207 | if (stateResId == 0) break; |
| 208 | if (stateResId == com.android.internal.R.attr.color) { |
| 209 | colorRes = attrs.getAttributeResourceValue(i, 0); |
| 210 | |
| 211 | if (colorRes == 0) { |
| 212 | color = attrs.getAttributeIntValue(i, color); |
| 213 | haveColor = true; |
| 214 | } |
| 215 | } else { |
| 216 | stateSpec[j++] = attrs.getAttributeBooleanValue(i, false) |
| 217 | ? stateResId |
| 218 | : -stateResId; |
| 219 | } |
| 220 | } |
| 221 | stateSpec = StateSet.trimStateSet(stateSpec, j); |
| 222 | |
| 223 | if (colorRes != 0) { |
| 224 | color = r.getColor(colorRes); |
| 225 | } else if (!haveColor) { |
| 226 | throw new XmlPullParserException( |
| 227 | parser.getPositionDescription() |
| 228 | + ": <item> tag requires a 'android:color' attribute."); |
| 229 | } |
| 230 | |
| 231 | if (listSize == 0 || stateSpec.length == 0) { |
| 232 | mDefaultColor = color; |
| 233 | } |
| 234 | |
| 235 | if (listSize + 1 >= listAllocated) { |
| 236 | listAllocated = ArrayUtils.idealIntArraySize(listSize + 1); |
| 237 | |
| 238 | int[] ncolor = new int[listAllocated]; |
| 239 | System.arraycopy(colorList, 0, ncolor, 0, listSize); |
| 240 | |
| 241 | int[][] nstate = new int[listAllocated][]; |
| 242 | System.arraycopy(stateSpecList, 0, nstate, 0, listSize); |
| 243 | |
| 244 | colorList = ncolor; |
| 245 | stateSpecList = nstate; |
| 246 | } |
| 247 | |
| 248 | colorList[listSize] = color; |
| 249 | stateSpecList[listSize] = stateSpec; |
| 250 | listSize++; |
| 251 | } |
| 252 | |
| 253 | mColors = new int[listSize]; |
| 254 | mStateSpecs = new int[listSize][]; |
| 255 | System.arraycopy(colorList, 0, mColors, 0, listSize); |
| 256 | System.arraycopy(stateSpecList, 0, mStateSpecs, 0, listSize); |
| 257 | } |
| 258 | |
| 259 | public boolean isStateful() { |
| 260 | return mStateSpecs.length > 1; |
| 261 | } |
| 262 | |
| 263 | /** |
| 264 | * Return the color associated with the given set of {@link android.view.View} states. |
| 265 | * |
| 266 | * @param stateSet an array of {@link android.view.View} states |
| 267 | * @param defaultColor the color to return if there's not state spec in this |
| 268 | * {@link ColorStateList} that matches the stateSet. |
| 269 | * |
| 270 | * @return the color associated with that set of states in this {@link ColorStateList}. |
| 271 | */ |
| 272 | public int getColorForState(int[] stateSet, int defaultColor) { |
| 273 | final int setLength = mStateSpecs.length; |
| 274 | for (int i = 0; i < setLength; i++) { |
| 275 | int[] stateSpec = mStateSpecs[i]; |
| 276 | if (StateSet.stateSetMatches(stateSpec, stateSet)) { |
| 277 | return mColors[i]; |
| 278 | } |
| 279 | } |
| 280 | return defaultColor; |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Return the default color in this {@link ColorStateList}. |
| 285 | * |
| 286 | * @return the default color in this {@link ColorStateList}. |
| 287 | */ |
| 288 | public int getDefaultColor() { |
| 289 | return mDefaultColor; |
| 290 | } |
| 291 | |
| 292 | public String toString() { |
| 293 | return "ColorStateList{" + |
| 294 | "mStateSpecs=" + Arrays.deepToString(mStateSpecs) + |
| 295 | "mColors=" + Arrays.toString(mColors) + |
| 296 | "mDefaultColor=" + mDefaultColor + '}'; |
| 297 | } |
| 298 | |
| 299 | public int describeContents() { |
| 300 | return 0; |
| 301 | } |
| 302 | |
| 303 | public void writeToParcel(Parcel dest, int flags) { |
| 304 | final int N = mStateSpecs.length; |
| 305 | dest.writeInt(N); |
| 306 | for (int i=0; i<N; i++) { |
| 307 | dest.writeIntArray(mStateSpecs[i]); |
| 308 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 309 | dest.writeIntArray(mColors); |
| 310 | } |
| 311 | |
| 312 | public static final Parcelable.Creator<ColorStateList> CREATOR = |
| 313 | new Parcelable.Creator<ColorStateList>() { |
| 314 | public ColorStateList[] newArray(int size) { |
| 315 | return new ColorStateList[size]; |
| 316 | } |
| 317 | |
| 318 | public ColorStateList createFromParcel(Parcel source) { |
| 319 | final int N = source.readInt(); |
| 320 | int[][] stateSpecs = new int[N][]; |
| 321 | for (int i=0; i<N; i++) { |
| 322 | stateSpecs[i] = source.createIntArray(); |
| 323 | } |
| 324 | int[] colors = source.createIntArray(); |
| 325 | return new ColorStateList(stateSpecs, colors); |
| 326 | } |
| 327 | }; |
| 328 | } |