Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 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.text; |
| 18 | |
| 19 | import com.android.internal.util.ArrayUtils; |
| 20 | |
| 21 | import android.graphics.Bitmap; |
| 22 | import android.graphics.Canvas; |
| 23 | import android.graphics.Paint; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 24 | import android.graphics.Paint.FontMetricsInt; |
Gilles Debunne | cc3ec6c | 2010-06-23 10:30:27 -0700 | [diff] [blame^] | 25 | import android.graphics.RectF; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 26 | import android.text.Layout.Directions; |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 27 | import android.text.Layout.TabStops; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 28 | import android.text.style.CharacterStyle; |
| 29 | import android.text.style.MetricAffectingSpan; |
| 30 | import android.text.style.ReplacementSpan; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 31 | import android.util.Log; |
| 32 | |
| 33 | /** |
| 34 | * Represents a line of styled text, for measuring in visual order and |
| 35 | * for rendering. |
| 36 | * |
| 37 | * <p>Get a new instance using obtain(), and when finished with it, return it |
| 38 | * to the pool using recycle(). |
| 39 | * |
| 40 | * <p>Call set to prepare the instance for use, then either draw, measure, |
| 41 | * metrics, or caretToLeftRightOf. |
| 42 | * |
| 43 | * @hide |
| 44 | */ |
| 45 | class TextLine { |
| 46 | private TextPaint mPaint; |
| 47 | private CharSequence mText; |
| 48 | private int mStart; |
| 49 | private int mLen; |
| 50 | private int mDir; |
| 51 | private Directions mDirections; |
| 52 | private boolean mHasTabs; |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 53 | private TabStops mTabs; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 54 | private char[] mChars; |
| 55 | private boolean mCharsValid; |
| 56 | private Spanned mSpanned; |
Gilles Debunne | 345cb03 | 2010-06-16 17:13:23 -0700 | [diff] [blame] | 57 | private final TextPaint mWorkPaint = new TextPaint(); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 58 | |
| 59 | private static TextLine[] cached = new TextLine[3]; |
| 60 | |
| 61 | /** |
| 62 | * Returns a new TextLine from the shared pool. |
| 63 | * |
| 64 | * @return an uninitialized TextLine |
| 65 | */ |
| 66 | static TextLine obtain() { |
| 67 | TextLine tl; |
| 68 | synchronized (cached) { |
| 69 | for (int i = cached.length; --i >= 0;) { |
| 70 | if (cached[i] != null) { |
| 71 | tl = cached[i]; |
| 72 | cached[i] = null; |
| 73 | return tl; |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | tl = new TextLine(); |
| 78 | Log.e("TLINE", "new: " + tl); |
| 79 | return tl; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Puts a TextLine back into the shared pool. Do not use this TextLine once |
| 84 | * it has been returned. |
| 85 | * @param tl the textLine |
| 86 | * @return null, as a convenience from clearing references to the provided |
| 87 | * TextLine |
| 88 | */ |
| 89 | static TextLine recycle(TextLine tl) { |
| 90 | tl.mText = null; |
| 91 | tl.mPaint = null; |
| 92 | tl.mDirections = null; |
| 93 | if (tl.mLen < 250) { |
| 94 | synchronized(cached) { |
| 95 | for (int i = 0; i < cached.length; ++i) { |
| 96 | if (cached[i] == null) { |
| 97 | cached[i] = tl; |
| 98 | break; |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | } |
| 103 | return null; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * Initializes a TextLine and prepares it for use. |
| 108 | * |
| 109 | * @param paint the base paint for the line |
| 110 | * @param text the text, can be Styled |
| 111 | * @param start the start of the line relative to the text |
| 112 | * @param limit the limit of the line relative to the text |
| 113 | * @param dir the paragraph direction of this line |
| 114 | * @param directions the directions information of this line |
| 115 | * @param hasTabs true if the line might contain tabs or emoji |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 116 | * @param tabStops the tabStops. Can be null. |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 117 | */ |
| 118 | void set(TextPaint paint, CharSequence text, int start, int limit, int dir, |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 119 | Directions directions, boolean hasTabs, TabStops tabStops) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 120 | mPaint = paint; |
| 121 | mText = text; |
| 122 | mStart = start; |
| 123 | mLen = limit - start; |
| 124 | mDir = dir; |
| 125 | mDirections = directions; |
| 126 | mHasTabs = hasTabs; |
| 127 | mSpanned = null; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 128 | |
| 129 | boolean hasReplacement = false; |
| 130 | if (text instanceof Spanned) { |
| 131 | mSpanned = (Spanned) text; |
| 132 | hasReplacement = mSpanned.getSpans(start, limit, |
| 133 | ReplacementSpan.class).length > 0; |
| 134 | } |
| 135 | |
| 136 | mCharsValid = hasReplacement || hasTabs || |
| 137 | directions != Layout.DIRS_ALL_LEFT_TO_RIGHT; |
| 138 | |
| 139 | if (mCharsValid) { |
| 140 | if (mChars == null || mChars.length < mLen) { |
| 141 | mChars = new char[ArrayUtils.idealCharArraySize(mLen)]; |
| 142 | } |
| 143 | TextUtils.getChars(text, start, limit, mChars, 0); |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 144 | if (hasReplacement) { |
| 145 | // Handle these all at once so we don't have to do it as we go. |
| 146 | // Replace the first character of each replacement run with the |
| 147 | // object-replacement character and the remainder with zero width |
| 148 | // non-break space aka BOM. Cursor movement code skips these |
| 149 | // zero-width characters. |
| 150 | char[] chars = mChars; |
| 151 | for (int i = start, inext; i < limit; i = inext) { |
| 152 | inext = mSpanned.nextSpanTransition(i, limit, |
| 153 | ReplacementSpan.class); |
| 154 | if (mSpanned.getSpans(i, inext, ReplacementSpan.class) |
| 155 | .length > 0) { // transition into a span |
| 156 | chars[i - start] = '\ufffc'; |
| 157 | for (int j = i - start + 1, e = inext - start; j < e; ++j) { |
| 158 | chars[j] = '\ufeff'; // used as ZWNBS, marks positions to skip |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 163 | } |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 164 | mTabs = tabStops; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Renders the TextLine. |
| 169 | * |
| 170 | * @param c the canvas to render on |
| 171 | * @param x the leading margin position |
| 172 | * @param top the top of the line |
| 173 | * @param y the baseline |
| 174 | * @param bottom the bottom of the line |
| 175 | */ |
| 176 | void draw(Canvas c, float x, int top, int y, int bottom) { |
| 177 | if (!mHasTabs) { |
| 178 | if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { |
| 179 | drawRun(c, 0, 0, mLen, false, x, top, y, bottom, false); |
| 180 | return; |
| 181 | } |
| 182 | if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { |
| 183 | drawRun(c, 0, 0, mLen, true, x, top, y, bottom, false); |
| 184 | return; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | float h = 0; |
| 189 | int[] runs = mDirections.mDirections; |
| 190 | RectF emojiRect = null; |
| 191 | |
| 192 | int lastRunIndex = runs.length - 2; |
| 193 | for (int i = 0; i < runs.length; i += 2) { |
| 194 | int runStart = runs[i]; |
| 195 | int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); |
| 196 | if (runLimit > mLen) { |
| 197 | runLimit = mLen; |
| 198 | } |
| 199 | boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; |
| 200 | |
| 201 | int segstart = runStart; |
| 202 | char[] chars = mChars; |
| 203 | for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { |
| 204 | int codept = 0; |
| 205 | Bitmap bm = null; |
| 206 | |
| 207 | if (mHasTabs && j < runLimit) { |
| 208 | codept = mChars[j]; |
| 209 | if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { |
| 210 | codept = Character.codePointAt(mChars, j); |
| 211 | if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { |
| 212 | bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); |
| 213 | } else if (codept > 0xffff) { |
| 214 | ++j; |
| 215 | continue; |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | if (j == runLimit || codept == '\t' || bm != null) { |
| 221 | h += drawRun(c, i, segstart, j, runIsRtl, x+h, top, y, bottom, |
| 222 | i != lastRunIndex || j != mLen); |
| 223 | |
| 224 | if (codept == '\t') { |
| 225 | h = mDir * nextTab(h * mDir); |
| 226 | } else if (bm != null) { |
| 227 | float bmAscent = ascent(j); |
| 228 | float bitmapHeight = bm.getHeight(); |
| 229 | float scale = -bmAscent / bitmapHeight; |
| 230 | float width = bm.getWidth() * scale; |
| 231 | |
| 232 | if (emojiRect == null) { |
| 233 | emojiRect = new RectF(); |
| 234 | } |
| 235 | emojiRect.set(x + h, y + bmAscent, |
| 236 | x + h + width, y); |
| 237 | c.drawBitmap(bm, null, emojiRect, mPaint); |
| 238 | h += width; |
| 239 | j++; |
| 240 | } |
| 241 | segstart = j + 1; |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | /** |
| 248 | * Returns metrics information for the entire line. |
| 249 | * |
| 250 | * @param fmi receives font metrics information, can be null |
| 251 | * @return the signed width of the line |
| 252 | */ |
| 253 | float metrics(FontMetricsInt fmi) { |
| 254 | return measure(mLen, false, fmi); |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Returns information about a position on the line. |
| 259 | * |
| 260 | * @param offset the line-relative character offset, between 0 and the |
| 261 | * line length, inclusive |
| 262 | * @param trailing true to measure the trailing edge of the character |
| 263 | * before offset, false to measure the leading edge of the character |
| 264 | * at offset. |
| 265 | * @param fmi receives metrics information about the requested |
| 266 | * character, can be null. |
| 267 | * @return the signed offset from the leading margin to the requested |
| 268 | * character edge. |
| 269 | */ |
| 270 | float measure(int offset, boolean trailing, FontMetricsInt fmi) { |
| 271 | int target = trailing ? offset - 1 : offset; |
| 272 | if (target < 0) { |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | float h = 0; |
| 277 | |
| 278 | if (!mHasTabs) { |
| 279 | if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 280 | return measureRun(0, 0, offset, mLen, false, fmi); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 281 | } |
| 282 | if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { |
Doug Felt | 0b9d2ca | 2010-05-06 17:10:54 -0700 | [diff] [blame] | 283 | return measureRun(0, 0, offset, mLen, true, fmi); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 284 | } |
| 285 | } |
| 286 | |
| 287 | char[] chars = mChars; |
| 288 | int[] runs = mDirections.mDirections; |
| 289 | for (int i = 0; i < runs.length; i += 2) { |
| 290 | int runStart = runs[i]; |
| 291 | int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); |
| 292 | if (runLimit > mLen) { |
| 293 | runLimit = mLen; |
| 294 | } |
| 295 | boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; |
| 296 | |
| 297 | int segstart = runStart; |
| 298 | for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { |
| 299 | int codept = 0; |
| 300 | Bitmap bm = null; |
| 301 | |
| 302 | if (mHasTabs && j < runLimit) { |
| 303 | codept = chars[j]; |
| 304 | if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { |
| 305 | codept = Character.codePointAt(chars, j); |
| 306 | if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { |
| 307 | bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); |
| 308 | } else if (codept > 0xffff) { |
| 309 | ++j; |
| 310 | continue; |
| 311 | } |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | if (j == runLimit || codept == '\t' || bm != null) { |
| 316 | boolean inSegment = target >= segstart && target < j; |
| 317 | |
| 318 | boolean advance = (mDir == Layout.DIR_RIGHT_TO_LEFT) == runIsRtl; |
| 319 | if (inSegment && advance) { |
| 320 | return h += measureRun(i, segstart, offset, j, runIsRtl, fmi); |
| 321 | } |
| 322 | |
| 323 | float w = measureRun(i, segstart, j, j, runIsRtl, fmi); |
| 324 | h += advance ? w : -w; |
| 325 | |
| 326 | if (inSegment) { |
| 327 | return h += measureRun(i, segstart, offset, j, runIsRtl, null); |
| 328 | } |
| 329 | |
| 330 | if (codept == '\t') { |
| 331 | if (offset == j) { |
| 332 | return h; |
| 333 | } |
| 334 | h = mDir * nextTab(h * mDir); |
| 335 | if (target == j) { |
| 336 | return h; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | if (bm != null) { |
| 341 | float bmAscent = ascent(j); |
| 342 | float wid = bm.getWidth() * -bmAscent / bm.getHeight(); |
| 343 | h += mDir * wid; |
| 344 | j++; |
| 345 | } |
| 346 | |
| 347 | segstart = j + 1; |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | return h; |
| 353 | } |
| 354 | |
| 355 | /** |
| 356 | * Draws a unidirectional (but possibly multi-styled) run of text. |
| 357 | * |
| 358 | * @param c the canvas to draw on |
| 359 | * @param runIndex the index of this directional run |
| 360 | * @param start the line-relative start |
| 361 | * @param limit the line-relative limit |
| 362 | * @param runIsRtl true if the run is right-to-left |
| 363 | * @param x the position of the run that is closest to the leading margin |
| 364 | * @param top the top of the line |
| 365 | * @param y the baseline |
| 366 | * @param bottom the bottom of the line |
| 367 | * @param needWidth true if the width value is required. |
| 368 | * @return the signed width of the run, based on the paragraph direction. |
| 369 | * Only valid if needWidth is true. |
| 370 | */ |
| 371 | private float drawRun(Canvas c, int runIndex, int start, |
| 372 | int limit, boolean runIsRtl, float x, int top, int y, int bottom, |
| 373 | boolean needWidth) { |
| 374 | |
| 375 | if ((mDir == Layout.DIR_LEFT_TO_RIGHT) == runIsRtl) { |
| 376 | float w = -measureRun(runIndex, start, limit, limit, runIsRtl, null); |
| 377 | handleRun(runIndex, start, limit, limit, runIsRtl, c, x + w, top, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 378 | y, bottom, null, false); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 379 | return w; |
| 380 | } |
| 381 | |
| 382 | return handleRun(runIndex, start, limit, limit, runIsRtl, c, x, top, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 383 | y, bottom, null, needWidth); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Measures a unidirectional (but possibly multi-styled) run of text. |
| 388 | * |
| 389 | * @param runIndex the run index |
| 390 | * @param start the line-relative start of the run |
| 391 | * @param offset the offset to measure to, between start and limit inclusive |
| 392 | * @param limit the line-relative limit of the run |
| 393 | * @param runIsRtl true if the run is right-to-left |
| 394 | * @param fmi receives metrics information about the requested |
| 395 | * run, can be null. |
| 396 | * @return the signed width from the start of the run to the leading edge |
| 397 | * of the character at offset, based on the run (not paragraph) direction |
| 398 | */ |
| 399 | private float measureRun(int runIndex, int start, |
| 400 | int offset, int limit, boolean runIsRtl, FontMetricsInt fmi) { |
| 401 | return handleRun(runIndex, start, offset, limit, runIsRtl, null, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 402 | 0, 0, 0, 0, fmi, true); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | /** |
| 406 | * Walk the cursor through this line, skipping conjuncts and |
| 407 | * zero-width characters. |
| 408 | * |
| 409 | * <p>This function cannot properly walk the cursor off the ends of the line |
| 410 | * since it does not know about any shaping on the previous/following line |
| 411 | * that might affect the cursor position. Callers must either avoid these |
| 412 | * situations or handle the result specially. |
| 413 | * |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 414 | * @param cursor the starting position of the cursor, between 0 and the |
| 415 | * length of the line, inclusive |
| 416 | * @param toLeft true if the caret is moving to the left. |
| 417 | * @return the new offset. If it is less than 0 or greater than the length |
| 418 | * of the line, the previous/following line should be examined to get the |
| 419 | * actual offset. |
| 420 | */ |
| 421 | int getOffsetToLeftRightOf(int cursor, boolean toLeft) { |
| 422 | // 1) The caret marks the leading edge of a character. The character |
| 423 | // logically before it might be on a different level, and the active caret |
| 424 | // position is on the character at the lower level. If that character |
| 425 | // was the previous character, the caret is on its trailing edge. |
| 426 | // 2) Take this character/edge and move it in the indicated direction. |
| 427 | // This gives you a new character and a new edge. |
| 428 | // 3) This position is between two visually adjacent characters. One of |
| 429 | // these might be at a lower level. The active position is on the |
| 430 | // character at the lower level. |
| 431 | // 4) If the active position is on the trailing edge of the character, |
| 432 | // the new caret position is the following logical character, else it |
| 433 | // is the character. |
| 434 | |
| 435 | int lineStart = 0; |
| 436 | int lineEnd = mLen; |
| 437 | boolean paraIsRtl = mDir == -1; |
| 438 | int[] runs = mDirections.mDirections; |
| 439 | |
| 440 | int runIndex, runLevel = 0, runStart = lineStart, runLimit = lineEnd, newCaret = -1; |
| 441 | boolean trailing = false; |
| 442 | |
| 443 | if (cursor == lineStart) { |
| 444 | runIndex = -2; |
| 445 | } else if (cursor == lineEnd) { |
| 446 | runIndex = runs.length; |
| 447 | } else { |
| 448 | // First, get information about the run containing the character with |
| 449 | // the active caret. |
| 450 | for (runIndex = 0; runIndex < runs.length; runIndex += 2) { |
| 451 | runStart = lineStart + runs[runIndex]; |
| 452 | if (cursor >= runStart) { |
| 453 | runLimit = runStart + (runs[runIndex+1] & Layout.RUN_LENGTH_MASK); |
| 454 | if (runLimit > lineEnd) { |
| 455 | runLimit = lineEnd; |
| 456 | } |
| 457 | if (cursor < runLimit) { |
| 458 | runLevel = (runs[runIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & |
| 459 | Layout.RUN_LEVEL_MASK; |
| 460 | if (cursor == runStart) { |
| 461 | // The caret is on a run boundary, see if we should |
| 462 | // use the position on the trailing edge of the previous |
| 463 | // logical character instead. |
| 464 | int prevRunIndex, prevRunLevel, prevRunStart, prevRunLimit; |
| 465 | int pos = cursor - 1; |
| 466 | for (prevRunIndex = 0; prevRunIndex < runs.length; prevRunIndex += 2) { |
| 467 | prevRunStart = lineStart + runs[prevRunIndex]; |
| 468 | if (pos >= prevRunStart) { |
| 469 | prevRunLimit = prevRunStart + |
| 470 | (runs[prevRunIndex+1] & Layout.RUN_LENGTH_MASK); |
| 471 | if (prevRunLimit > lineEnd) { |
| 472 | prevRunLimit = lineEnd; |
| 473 | } |
| 474 | if (pos < prevRunLimit) { |
| 475 | prevRunLevel = (runs[prevRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) |
| 476 | & Layout.RUN_LEVEL_MASK; |
| 477 | if (prevRunLevel < runLevel) { |
| 478 | // Start from logically previous character. |
| 479 | runIndex = prevRunIndex; |
| 480 | runLevel = prevRunLevel; |
| 481 | runStart = prevRunStart; |
| 482 | runLimit = prevRunLimit; |
| 483 | trailing = true; |
| 484 | break; |
| 485 | } |
| 486 | } |
| 487 | } |
| 488 | } |
| 489 | } |
| 490 | break; |
| 491 | } |
| 492 | } |
| 493 | } |
| 494 | |
| 495 | // caret might be == lineEnd. This is generally a space or paragraph |
| 496 | // separator and has an associated run, but might be the end of |
| 497 | // text, in which case it doesn't. If that happens, we ran off the |
| 498 | // end of the run list, and runIndex == runs.length. In this case, |
| 499 | // we are at a run boundary so we skip the below test. |
| 500 | if (runIndex != runs.length) { |
| 501 | boolean runIsRtl = (runLevel & 0x1) != 0; |
| 502 | boolean advance = toLeft == runIsRtl; |
| 503 | if (cursor != (advance ? runLimit : runStart) || advance != trailing) { |
| 504 | // Moving within or into the run, so we can move logically. |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 505 | newCaret = getOffsetBeforeAfter(runIndex, runStart, runLimit, |
| 506 | runIsRtl, cursor, advance); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 507 | // If the new position is internal to the run, we're at the strong |
| 508 | // position already so we're finished. |
| 509 | if (newCaret != (advance ? runLimit : runStart)) { |
| 510 | return newCaret; |
| 511 | } |
| 512 | } |
| 513 | } |
| 514 | } |
| 515 | |
| 516 | // If newCaret is -1, we're starting at a run boundary and crossing |
| 517 | // into another run. Otherwise we've arrived at a run boundary, and |
| 518 | // need to figure out which character to attach to. Note we might |
| 519 | // need to run this twice, if we cross a run boundary and end up at |
| 520 | // another run boundary. |
| 521 | while (true) { |
| 522 | boolean advance = toLeft == paraIsRtl; |
| 523 | int otherRunIndex = runIndex + (advance ? 2 : -2); |
| 524 | if (otherRunIndex >= 0 && otherRunIndex < runs.length) { |
| 525 | int otherRunStart = lineStart + runs[otherRunIndex]; |
| 526 | int otherRunLimit = otherRunStart + |
| 527 | (runs[otherRunIndex+1] & Layout.RUN_LENGTH_MASK); |
| 528 | if (otherRunLimit > lineEnd) { |
| 529 | otherRunLimit = lineEnd; |
| 530 | } |
| 531 | int otherRunLevel = (runs[otherRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & |
| 532 | Layout.RUN_LEVEL_MASK; |
| 533 | boolean otherRunIsRtl = (otherRunLevel & 1) != 0; |
| 534 | |
| 535 | advance = toLeft == otherRunIsRtl; |
| 536 | if (newCaret == -1) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 537 | newCaret = getOffsetBeforeAfter(otherRunIndex, otherRunStart, |
| 538 | otherRunLimit, otherRunIsRtl, |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 539 | advance ? otherRunStart : otherRunLimit, advance); |
| 540 | if (newCaret == (advance ? otherRunLimit : otherRunStart)) { |
| 541 | // Crossed and ended up at a new boundary, |
| 542 | // repeat a second and final time. |
| 543 | runIndex = otherRunIndex; |
| 544 | runLevel = otherRunLevel; |
| 545 | continue; |
| 546 | } |
| 547 | break; |
| 548 | } |
| 549 | |
| 550 | // The new caret is at a boundary. |
| 551 | if (otherRunLevel < runLevel) { |
| 552 | // The strong character is in the other run. |
| 553 | newCaret = advance ? otherRunStart : otherRunLimit; |
| 554 | } |
| 555 | break; |
| 556 | } |
| 557 | |
| 558 | if (newCaret == -1) { |
| 559 | // We're walking off the end of the line. The paragraph |
| 560 | // level is always equal to or lower than any internal level, so |
| 561 | // the boundaries get the strong caret. |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 562 | newCaret = advance ? mLen + 1 : -1; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 563 | break; |
| 564 | } |
| 565 | |
| 566 | // Else we've arrived at the end of the line. That's a strong position. |
| 567 | // We might have arrived here by crossing over a run with no internal |
| 568 | // breaks and dropping out of the above loop before advancing one final |
| 569 | // time, so reset the caret. |
| 570 | // Note, we use '<=' below to handle a situation where the only run |
| 571 | // on the line is a counter-directional run. If we're not advancing, |
| 572 | // we can end up at the 'lineEnd' position but the caret we want is at |
| 573 | // the lineStart. |
| 574 | if (newCaret <= lineEnd) { |
| 575 | newCaret = advance ? lineEnd : lineStart; |
| 576 | } |
| 577 | break; |
| 578 | } |
| 579 | |
| 580 | return newCaret; |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * Returns the next valid offset within this directional run, skipping |
| 585 | * conjuncts and zero-width characters. This should not be called to walk |
Gilles Debunne | cc3ec6c | 2010-06-23 10:30:27 -0700 | [diff] [blame^] | 586 | * off the end of the line, since the returned values might not be valid |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 587 | * on neighboring lines. If the returned offset is less than zero or |
| 588 | * greater than the line length, the offset should be recomputed on the |
| 589 | * preceding or following line, respectively. |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 590 | * |
| 591 | * @param runIndex the run index |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 592 | * @param runStart the start of the run |
| 593 | * @param runLimit the limit of the run |
| 594 | * @param runIsRtl true if the run is right-to-left |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 595 | * @param offset the offset |
| 596 | * @param after true if the new offset should logically follow the provided |
| 597 | * offset |
| 598 | * @return the new offset |
| 599 | */ |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 600 | private int getOffsetBeforeAfter(int runIndex, int runStart, int runLimit, |
| 601 | boolean runIsRtl, int offset, boolean after) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 602 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 603 | if (runIndex < 0 || offset == (after ? mLen : 0)) { |
| 604 | // Walking off end of line. Since we don't know |
| 605 | // what cursor positions are available on other lines, we can't |
| 606 | // return accurate values. These are a guess. |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 607 | if (after) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 608 | return TextUtils.getOffsetAfter(mText, offset + mStart) - mStart; |
| 609 | } |
| 610 | return TextUtils.getOffsetBefore(mText, offset + mStart) - mStart; |
| 611 | } |
| 612 | |
| 613 | TextPaint wp = mWorkPaint; |
| 614 | wp.set(mPaint); |
| 615 | |
| 616 | int spanStart = runStart; |
| 617 | int spanLimit; |
| 618 | if (mSpanned == null) { |
| 619 | spanLimit = runLimit; |
| 620 | } else { |
| 621 | int target = after ? offset + 1 : offset; |
| 622 | int limit = mStart + runLimit; |
| 623 | while (true) { |
| 624 | spanLimit = mSpanned.nextSpanTransition(mStart + spanStart, limit, |
| 625 | MetricAffectingSpan.class) - mStart; |
| 626 | if (spanLimit >= target) { |
| 627 | break; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 628 | } |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 629 | spanStart = spanLimit; |
| 630 | } |
| 631 | |
| 632 | MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + spanStart, |
| 633 | mStart + spanLimit, MetricAffectingSpan.class); |
| 634 | |
| 635 | if (spans.length > 0) { |
| 636 | ReplacementSpan replacement = null; |
| 637 | for (int j = 0; j < spans.length; j++) { |
| 638 | MetricAffectingSpan span = spans[j]; |
| 639 | if (span instanceof ReplacementSpan) { |
| 640 | replacement = (ReplacementSpan)span; |
| 641 | } else { |
| 642 | span.updateMeasureState(wp); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | if (replacement != null) { |
| 647 | // If we have a replacement span, we're moving either to |
| 648 | // the start or end of this span. |
| 649 | return after ? spanLimit : spanStart; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 650 | } |
| 651 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 652 | } |
| 653 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 654 | int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; |
| 655 | int cursorOpt = after ? Paint.CURSOR_AFTER : Paint.CURSOR_BEFORE; |
| 656 | if (mCharsValid) { |
| 657 | return wp.getTextRunCursor(mChars, spanStart, spanLimit - spanStart, |
| 658 | flags, offset, cursorOpt); |
| 659 | } else { |
| 660 | return wp.getTextRunCursor(mText, mStart + spanStart, |
Gilles Debunne | 345cb03 | 2010-06-16 17:13:23 -0700 | [diff] [blame] | 661 | mStart + spanLimit, flags, mStart + offset, cursorOpt) - mStart; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 662 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 663 | } |
| 664 | |
| 665 | /** |
| 666 | * Utility function for measuring and rendering text. The text must |
| 667 | * not include a tab or emoji. |
| 668 | * |
| 669 | * @param wp the working paint |
| 670 | * @param start the start of the text |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 671 | * @param end the end of the text |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 672 | * @param runIsRtl true if the run is right-to-left |
| 673 | * @param c the canvas, can be null if rendering is not needed |
| 674 | * @param x the edge of the run closest to the leading margin |
| 675 | * @param top the top of the line |
| 676 | * @param y the baseline |
| 677 | * @param bottom the bottom of the line |
| 678 | * @param fmi receives metrics information, can be null |
| 679 | * @param needWidth true if the width of the run is needed |
| 680 | * @return the signed width of the run based on the run direction; only |
| 681 | * valid if needWidth is true |
| 682 | */ |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 683 | private float handleText(TextPaint wp, int start, int end, |
| 684 | int contextStart, int contextEnd, boolean runIsRtl, |
| 685 | Canvas c, float x, int top, int y, int bottom, |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 686 | FontMetricsInt fmi, boolean needWidth) { |
| 687 | |
| 688 | float ret = 0; |
| 689 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 690 | int runLen = end - start; |
| 691 | int contextLen = contextEnd - contextStart; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 692 | if (needWidth || (c != null && (wp.bgColor != 0 || runIsRtl))) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 693 | int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 694 | if (mCharsValid) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 695 | ret = wp.getTextRunAdvances(mChars, start, runLen, |
| 696 | contextStart, contextLen, flags, null, 0); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 697 | } else { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 698 | int delta = mStart; |
| 699 | ret = wp.getTextRunAdvances(mText, delta + start, |
| 700 | delta + end, delta + contextStart, delta + contextEnd, |
| 701 | flags, null, 0); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 702 | } |
| 703 | } |
| 704 | |
| 705 | if (fmi != null) { |
| 706 | wp.getFontMetricsInt(fmi); |
| 707 | } |
| 708 | |
| 709 | if (c != null) { |
| 710 | if (runIsRtl) { |
| 711 | x -= ret; |
| 712 | } |
| 713 | |
| 714 | if (wp.bgColor != 0) { |
| 715 | int color = wp.getColor(); |
| 716 | Paint.Style s = wp.getStyle(); |
| 717 | wp.setColor(wp.bgColor); |
| 718 | wp.setStyle(Paint.Style.FILL); |
| 719 | |
| 720 | c.drawRect(x, top, x + ret, bottom, wp); |
| 721 | |
| 722 | wp.setStyle(s); |
| 723 | wp.setColor(color); |
| 724 | } |
| 725 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 726 | drawTextRun(c, wp, start, end, contextStart, contextEnd, runIsRtl, |
| 727 | x, y + wp.baselineShift); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 728 | } |
| 729 | |
| 730 | return runIsRtl ? -ret : ret; |
| 731 | } |
| 732 | |
| 733 | /** |
| 734 | * Utility function for measuring and rendering a replacement. |
| 735 | * |
| 736 | * @param replacement the replacement |
| 737 | * @param wp the work paint |
| 738 | * @param runIndex the run index |
| 739 | * @param start the start of the run |
| 740 | * @param limit the limit of the run |
| 741 | * @param runIsRtl true if the run is right-to-left |
| 742 | * @param c the canvas, can be null if not rendering |
| 743 | * @param x the edge of the replacement closest to the leading margin |
| 744 | * @param top the top of the line |
| 745 | * @param y the baseline |
| 746 | * @param bottom the bottom of the line |
| 747 | * @param fmi receives metrics information, can be null |
| 748 | * @param needWidth true if the width of the replacement is needed |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 749 | * @return the signed width of the run based on the run direction; only |
| 750 | * valid if needWidth is true |
| 751 | */ |
| 752 | private float handleReplacement(ReplacementSpan replacement, TextPaint wp, |
| 753 | int runIndex, int start, int limit, boolean runIsRtl, Canvas c, |
| 754 | float x, int top, int y, int bottom, FontMetricsInt fmi, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 755 | boolean needWidth) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 756 | |
| 757 | float ret = 0; |
| 758 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 759 | int textStart = mStart + start; |
| 760 | int textLimit = mStart + limit; |
| 761 | |
| 762 | if (needWidth || (c != null && runIsRtl)) { |
| 763 | ret = replacement.getSize(wp, mText, textStart, textLimit, fmi); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 764 | } |
| 765 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 766 | if (c != null) { |
| 767 | if (runIsRtl) { |
| 768 | x -= ret; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 769 | } |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 770 | replacement.draw(c, mText, textStart, textLimit, |
| 771 | x, top, y, bottom, wp); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | return runIsRtl ? -ret : ret; |
| 775 | } |
| 776 | |
| 777 | /** |
| 778 | * Utility function for handling a unidirectional run. The run must not |
| 779 | * contain tabs or emoji but can contain styles. |
| 780 | * |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 781 | * @param runIndex the run index |
| 782 | * @param start the line-relative start of the run |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 783 | * @param measureLimit the offset to measure to, between start and limit inclusive |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 784 | * @param limit the limit of the run |
| 785 | * @param runIsRtl true if the run is right-to-left |
| 786 | * @param c the canvas, can be null |
| 787 | * @param x the end of the run closest to the leading margin |
| 788 | * @param top the top of the line |
| 789 | * @param y the baseline |
| 790 | * @param bottom the bottom of the line |
| 791 | * @param fmi receives metrics information, can be null |
| 792 | * @param needWidth true if the width is required |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 793 | * @return the signed width of the run based on the run direction; only |
| 794 | * valid if needWidth is true |
| 795 | */ |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 796 | private float handleRun(int runIndex, int start, int measureLimit, |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 797 | int limit, boolean runIsRtl, Canvas c, float x, int top, int y, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 798 | int bottom, FontMetricsInt fmi, boolean needWidth) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 799 | |
| 800 | // Shaping needs to take into account context up to metric boundaries, |
| 801 | // but rendering needs to take into account character style boundaries. |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 802 | // So we iterate through metric runs to get metric bounds, |
| 803 | // then within each metric run iterate through character style runs |
| 804 | // for the run bounds. |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 805 | float ox = x; |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 806 | for (int i = start, inext; i < measureLimit; i = inext) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 807 | TextPaint wp = mWorkPaint; |
| 808 | wp.set(mPaint); |
| 809 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 810 | int mlimit; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 811 | if (mSpanned == null) { |
| 812 | inext = limit; |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 813 | mlimit = measureLimit; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 814 | } else { |
| 815 | inext = mSpanned.nextSpanTransition(mStart + i, mStart + limit, |
| 816 | MetricAffectingSpan.class) - mStart; |
| 817 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 818 | mlimit = inext < measureLimit ? inext : measureLimit; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 819 | MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + i, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 820 | mStart + mlimit, MetricAffectingSpan.class); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 821 | |
| 822 | if (spans.length > 0) { |
| 823 | ReplacementSpan replacement = null; |
| 824 | for (int j = 0; j < spans.length; j++) { |
| 825 | MetricAffectingSpan span = spans[j]; |
| 826 | if (span instanceof ReplacementSpan) { |
| 827 | replacement = (ReplacementSpan)span; |
| 828 | } else { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 829 | // We might have a replacement that uses the draw |
| 830 | // state, otherwise measure state would suffice. |
| 831 | span.updateDrawState(wp); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 832 | } |
| 833 | } |
| 834 | |
| 835 | if (replacement != null) { |
| 836 | x += handleReplacement(replacement, wp, runIndex, i, |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 837 | mlimit, runIsRtl, c, x, top, y, bottom, fmi, |
| 838 | needWidth || mlimit < measureLimit); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 839 | continue; |
| 840 | } |
| 841 | } |
| 842 | } |
| 843 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 844 | if (mSpanned == null || c == null) { |
| 845 | x += handleText(wp, i, mlimit, i, inext, runIsRtl, c, x, top, |
| 846 | y, bottom, fmi, needWidth || mlimit < measureLimit); |
| 847 | } else { |
| 848 | for (int j = i, jnext; j < mlimit; j = jnext) { |
| 849 | jnext = mSpanned.nextSpanTransition(mStart + j, |
| 850 | mStart + mlimit, CharacterStyle.class) - mStart; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 851 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 852 | CharacterStyle[] spans = mSpanned.getSpans(mStart + j, |
| 853 | mStart + jnext, CharacterStyle.class); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 854 | |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 855 | wp.set(mPaint); |
| 856 | for (int k = 0; k < spans.length; k++) { |
| 857 | CharacterStyle span = spans[k]; |
| 858 | span.updateDrawState(wp); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 859 | } |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 860 | |
| 861 | x += handleText(wp, j, jnext, i, inext, runIsRtl, c, x, |
| 862 | top, y, bottom, fmi, needWidth || jnext < measureLimit); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 863 | } |
| 864 | } |
| 865 | } |
| 866 | |
| 867 | return x - ox; |
| 868 | } |
| 869 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 870 | /** |
| 871 | * Render a text run with the set-up paint. |
| 872 | * |
| 873 | * @param c the canvas |
| 874 | * @param wp the paint used to render the text |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 875 | * @param start the start of the run |
| 876 | * @param end the end of the run |
| 877 | * @param contextStart the start of context for the run |
| 878 | * @param contextEnd the end of the context for the run |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 879 | * @param runIsRtl true if the run is right-to-left |
| 880 | * @param x the x position of the left edge of the run |
| 881 | * @param y the baseline of the run |
| 882 | */ |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 883 | private void drawTextRun(Canvas c, TextPaint wp, int start, int end, |
| 884 | int contextStart, int contextEnd, boolean runIsRtl, float x, int y) { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 885 | |
Doug Felt | f47d740 | 2010-04-21 16:01:52 -0700 | [diff] [blame] | 886 | int flags = runIsRtl ? Canvas.DIRECTION_RTL : Canvas.DIRECTION_LTR; |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 887 | if (mCharsValid) { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 888 | int count = end - start; |
| 889 | int contextCount = contextEnd - contextStart; |
| 890 | c.drawTextRun(mChars, start, count, contextStart, contextCount, |
| 891 | x, y, flags, wp); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 892 | } else { |
Doug Felt | 0c702b8 | 2010-05-14 10:55:42 -0700 | [diff] [blame] | 893 | int delta = mStart; |
| 894 | c.drawTextRun(mText, delta + start, delta + end, |
| 895 | delta + contextStart, delta + contextEnd, x, y, flags, wp); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 896 | } |
| 897 | } |
| 898 | |
| 899 | /** |
| 900 | * Returns the ascent of the text at start. This is used for scaling |
| 901 | * emoji. |
| 902 | * |
| 903 | * @param pos the line-relative position |
| 904 | * @return the ascent of the text at start |
| 905 | */ |
| 906 | float ascent(int pos) { |
| 907 | if (mSpanned == null) { |
| 908 | return mPaint.ascent(); |
| 909 | } |
| 910 | |
| 911 | pos += mStart; |
| 912 | MetricAffectingSpan[] spans = mSpanned.getSpans(pos, pos + 1, |
| 913 | MetricAffectingSpan.class); |
| 914 | if (spans.length == 0) { |
| 915 | return mPaint.ascent(); |
| 916 | } |
| 917 | |
| 918 | TextPaint wp = mWorkPaint; |
| 919 | wp.set(mPaint); |
| 920 | for (MetricAffectingSpan span : spans) { |
| 921 | span.updateMeasureState(wp); |
| 922 | } |
| 923 | return wp.ascent(); |
| 924 | } |
| 925 | |
| 926 | /** |
| 927 | * Returns the next tab position. |
| 928 | * |
| 929 | * @param h the (unsigned) offset from the leading margin |
| 930 | * @return the (unsigned) tab position after this offset |
| 931 | */ |
| 932 | float nextTab(float h) { |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 933 | if (mTabs != null) { |
| 934 | return mTabs.nextTab(h); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 935 | } |
Doug Felt | c982f60 | 2010-05-25 11:51:40 -0700 | [diff] [blame] | 936 | return TabStops.nextDefaultStop(h, TAB_INCREMENT); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | private static final int TAB_INCREMENT = 20; |
| 940 | } |