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.text; |
| 18 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 19 | import android.emoji.EmojiFactory; |
| 20 | import android.graphics.Bitmap; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 21 | import android.graphics.Canvas; |
| 22 | import android.graphics.Paint; |
| 23 | import android.graphics.Rect; |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 24 | import android.graphics.RectF; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 25 | import android.graphics.Path; |
| 26 | import com.android.internal.util.ArrayUtils; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 27 | |
| 28 | import junit.framework.Assert; |
| 29 | import android.text.style.*; |
| 30 | import android.text.method.TextKeyListener; |
| 31 | import android.view.KeyEvent; |
| 32 | |
| 33 | /** |
| 34 | * A base class that manages text layout in visual elements on |
| 35 | * the screen. |
| 36 | * <p>For text that will be edited, use a {@link DynamicLayout}, |
| 37 | * which will be updated as the text changes. |
| 38 | * For text that will not change, use a {@link StaticLayout}. |
| 39 | */ |
| 40 | public abstract class Layout { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 41 | private static final boolean DEBUG = false; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 42 | private static final ParagraphStyle[] NO_PARA_SPANS = |
| 43 | ArrayUtils.emptyArray(ParagraphStyle.class); |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 44 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 45 | /* package */ static final EmojiFactory EMOJI_FACTORY = |
| 46 | EmojiFactory.newAvailableInstance(); |
| 47 | /* package */ static final int MIN_EMOJI, MAX_EMOJI; |
| 48 | |
| 49 | static { |
| 50 | if (EMOJI_FACTORY != null) { |
| 51 | MIN_EMOJI = EMOJI_FACTORY.getMinimumAndroidPua(); |
| 52 | MAX_EMOJI = EMOJI_FACTORY.getMaximumAndroidPua(); |
| 53 | } else { |
| 54 | MIN_EMOJI = -1; |
| 55 | MAX_EMOJI = -1; |
| 56 | } |
| 57 | }; |
| 58 | |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 59 | private RectF mEmojiRect; |
| 60 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 61 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 62 | * Return how wide a layout must be in order to display the |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | * specified text with one line per paragraph. |
| 64 | */ |
| 65 | public static float getDesiredWidth(CharSequence source, |
| 66 | TextPaint paint) { |
| 67 | return getDesiredWidth(source, 0, source.length(), paint); |
| 68 | } |
| 69 | |
| 70 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 71 | * Return how wide a layout must be in order to display the |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 72 | * specified text slice with one line per paragraph. |
| 73 | */ |
| 74 | public static float getDesiredWidth(CharSequence source, |
| 75 | int start, int end, |
| 76 | TextPaint paint) { |
| 77 | float need = 0; |
| 78 | TextPaint workPaint = new TextPaint(); |
| 79 | |
| 80 | int next; |
| 81 | for (int i = start; i <= end; i = next) { |
| 82 | next = TextUtils.indexOf(source, '\n', i, end); |
| 83 | |
| 84 | if (next < 0) |
| 85 | next = end; |
| 86 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 87 | // note, omits trailing paragraph char |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 88 | float w = measureText(paint, workPaint, |
| 89 | source, i, next, null, true, null); |
| 90 | |
| 91 | if (w > need) |
| 92 | need = w; |
| 93 | |
| 94 | next++; |
| 95 | } |
| 96 | |
| 97 | return need; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Subclasses of Layout use this constructor to set the display text, |
| 102 | * width, and other standard properties. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 103 | * @param text the text to render |
| 104 | * @param paint the default paint for the layout. Styles can override |
| 105 | * various attributes of the paint. |
| 106 | * @param width the wrapping width for the text. |
| 107 | * @param align whether to left, right, or center the text. Styles can |
| 108 | * override the alignment. |
| 109 | * @param spacingMult factor by which to scale the font size to get the |
| 110 | * default line spacing |
| 111 | * @param spacingAdd amount to add to the default line spacing |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 112 | */ |
| 113 | protected Layout(CharSequence text, TextPaint paint, |
| 114 | int width, Alignment align, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 115 | float spacingMult, float spacingAdd) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 116 | if (width < 0) |
| 117 | throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| 118 | |
| 119 | mText = text; |
| 120 | mPaint = paint; |
| 121 | mWorkPaint = new TextPaint(); |
| 122 | mWidth = width; |
| 123 | mAlignment = align; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 124 | mSpacingMult = spacingMult; |
| 125 | mSpacingAdd = spacingAdd; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 126 | mSpannedText = text instanceof Spanned; |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Replace constructor properties of this Layout with new ones. Be careful. |
| 131 | */ |
| 132 | /* package */ void replaceWith(CharSequence text, TextPaint paint, |
| 133 | int width, Alignment align, |
| 134 | float spacingmult, float spacingadd) { |
| 135 | if (width < 0) { |
| 136 | throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| 137 | } |
| 138 | |
| 139 | mText = text; |
| 140 | mPaint = paint; |
| 141 | mWidth = width; |
| 142 | mAlignment = align; |
| 143 | mSpacingMult = spacingmult; |
| 144 | mSpacingAdd = spacingadd; |
| 145 | mSpannedText = text instanceof Spanned; |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Draw this Layout on the specified Canvas. |
| 150 | */ |
| 151 | public void draw(Canvas c) { |
| 152 | draw(c, null, null, 0); |
| 153 | } |
| 154 | |
| 155 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 156 | * Draw this Layout on the specified canvas, with the highlight path drawn |
| 157 | * between the background and the text. |
| 158 | * |
| 159 | * @param c the canvas |
| 160 | * @param highlight the path of the highlight or cursor; can be null |
| 161 | * @param highlightPaint the paint for the highlight |
| 162 | * @param cursorOffsetVertical the amount to temporarily translate the |
| 163 | * canvas while rendering the highlight |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 164 | */ |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 165 | public void draw(Canvas c, Path highlight, Paint highlightPaint, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 166 | int cursorOffsetVertical) { |
| 167 | int dtop, dbottom; |
| 168 | |
| 169 | synchronized (sTempRect) { |
| 170 | if (!c.getClipBounds(sTempRect)) { |
| 171 | return; |
| 172 | } |
| 173 | |
| 174 | dtop = sTempRect.top; |
| 175 | dbottom = sTempRect.bottom; |
| 176 | } |
| 177 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 178 | |
| 179 | int top = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 180 | int bottom = getLineTop(getLineCount()); |
| 181 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 182 | if (dtop > top) { |
| 183 | top = dtop; |
| 184 | } |
| 185 | if (dbottom < bottom) { |
| 186 | bottom = dbottom; |
| 187 | } |
| 188 | |
| 189 | int first = getLineForVertical(top); |
| 190 | int last = getLineForVertical(bottom); |
| 191 | |
| 192 | int previousLineBottom = getLineTop(first); |
| 193 | int previousLineEnd = getLineStart(first); |
| 194 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 195 | TextPaint paint = mPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 196 | CharSequence buf = mText; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 197 | int width = mWidth; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 198 | boolean spannedText = mSpannedText; |
| 199 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 200 | ParagraphStyle[] spans = NO_PARA_SPANS; |
| 201 | int spanend = 0; |
| 202 | int textLength = 0; |
| 203 | |
| 204 | // First, draw LineBackgroundSpans. |
| 205 | // LineBackgroundSpans know nothing about the alignment or direction of |
| 206 | // the layout or line. XXX: Should they? |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 207 | if (spannedText) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 208 | textLength = buf.length(); |
| 209 | for (int i = first; i <= last; i++) { |
| 210 | int start = previousLineEnd; |
| 211 | int end = getLineStart(i+1); |
| 212 | previousLineEnd = end; |
| 213 | |
| 214 | int ltop = previousLineBottom; |
| 215 | int lbottom = getLineTop(i+1); |
| 216 | previousLineBottom = lbottom; |
| 217 | int lbaseline = lbottom - getLineDescent(i); |
| 218 | |
| 219 | if (start >= spanend) { |
| 220 | Spanned sp = (Spanned) buf; |
| 221 | spanend = sp.nextSpanTransition(start, textLength, |
| 222 | LineBackgroundSpan.class); |
| 223 | spans = sp.getSpans(start, spanend, |
| 224 | LineBackgroundSpan.class); |
| 225 | } |
| 226 | |
| 227 | for (int n = 0; n < spans.length; n++) { |
| 228 | LineBackgroundSpan back = (LineBackgroundSpan) spans[n]; |
| 229 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 230 | back.drawBackground(c, paint, 0, width, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 231 | ltop, lbaseline, lbottom, |
| 232 | buf, start, end, |
| 233 | i); |
| 234 | } |
| 235 | } |
| 236 | // reset to their original values |
| 237 | spanend = 0; |
| 238 | previousLineBottom = getLineTop(first); |
| 239 | previousLineEnd = getLineStart(first); |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 240 | spans = NO_PARA_SPANS; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 241 | } |
| 242 | |
| 243 | // There can be a highlight even without spans if we are drawing |
| 244 | // a non-spanned transformation of a spanned editing buffer. |
| 245 | if (highlight != null) { |
| 246 | if (cursorOffsetVertical != 0) { |
| 247 | c.translate(0, cursorOffsetVertical); |
| 248 | } |
| 249 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 250 | c.drawPath(highlight, highlightPaint); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 251 | |
| 252 | if (cursorOffsetVertical != 0) { |
| 253 | c.translate(0, -cursorOffsetVertical); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | Alignment align = mAlignment; |
| 258 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 259 | // Next draw the lines, one at a time. |
| 260 | // the baseline is the top of the following line minus the current |
| 261 | // line's descent. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 262 | for (int i = first; i <= last; i++) { |
| 263 | int start = previousLineEnd; |
| 264 | |
| 265 | previousLineEnd = getLineStart(i+1); |
| 266 | int end = getLineVisibleEnd(i, start, previousLineEnd); |
| 267 | |
| 268 | int ltop = previousLineBottom; |
| 269 | int lbottom = getLineTop(i+1); |
| 270 | previousLineBottom = lbottom; |
| 271 | int lbaseline = lbottom - getLineDescent(i); |
| 272 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 273 | boolean isFirstParaLine = false; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 274 | if (spannedText) { |
| 275 | if (start == 0 || buf.charAt(start - 1) == '\n') { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 276 | isFirstParaLine = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 277 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 278 | // New batch of paragraph styles, compute the alignment. |
| 279 | // Last alignment style wins. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 280 | if (start >= spanend) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 281 | Spanned sp = (Spanned) buf; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 282 | spanend = sp.nextSpanTransition(start, textLength, |
| 283 | ParagraphStyle.class); |
| 284 | spans = sp.getSpans(start, spanend, ParagraphStyle.class); |
| 285 | |
| 286 | align = mAlignment; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 287 | for (int n = spans.length-1; n >= 0; n--) { |
| 288 | if (spans[n] instanceof AlignmentSpan) { |
| 289 | align = ((AlignmentSpan) spans[n]).getAlignment(); |
| 290 | break; |
| 291 | } |
| 292 | } |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | int dir = getParagraphDirection(i); |
| 297 | int left = 0; |
| 298 | int right = mWidth; |
| 299 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 300 | // Draw all leading margin spans. Adjust left or right according |
| 301 | // to the paragraph direction of the line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 302 | if (spannedText) { |
| 303 | final int length = spans.length; |
| 304 | for (int n = 0; n < length; n++) { |
| 305 | if (spans[n] instanceof LeadingMarginSpan) { |
| 306 | LeadingMarginSpan margin = (LeadingMarginSpan) spans[n]; |
| 307 | |
| 308 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 309 | margin.drawLeadingMargin(c, paint, right, dir, ltop, |
| 310 | lbaseline, lbottom, buf, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 311 | start, end, isFirstParaLine, this); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 312 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 313 | right -= margin.getLeadingMargin(isFirstParaLine); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 314 | } else { |
| 315 | margin.drawLeadingMargin(c, paint, left, dir, ltop, |
| 316 | lbaseline, lbottom, buf, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 317 | start, end, isFirstParaLine, this); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 318 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 319 | boolean useMargin = isFirstParaLine; |
Mark Wagner | 7b5676e | 2009-10-16 11:44:23 -0700 | [diff] [blame] | 320 | if (margin instanceof LeadingMarginSpan.LeadingMarginSpan2) { |
| 321 | int count = ((LeadingMarginSpan.LeadingMarginSpan2)margin).getLeadingMarginLineCount(); |
| 322 | useMargin = count > i; |
| 323 | } |
| 324 | left += margin.getLeadingMargin(useMargin); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 325 | } |
| 326 | } |
| 327 | } |
| 328 | } |
| 329 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 330 | // Adjust the point at which to start rendering depending on the |
| 331 | // alignment of the paragraph. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 332 | int x; |
| 333 | if (align == Alignment.ALIGN_NORMAL) { |
| 334 | if (dir == DIR_LEFT_TO_RIGHT) { |
| 335 | x = left; |
| 336 | } else { |
| 337 | x = right; |
| 338 | } |
| 339 | } else { |
| 340 | int max = (int)getLineMax(i, spans, false); |
| 341 | if (align == Alignment.ALIGN_OPPOSITE) { |
| 342 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 343 | x = left + max; |
| 344 | } else { |
| 345 | x = right - max; |
| 346 | } |
| 347 | } else { |
| 348 | // Alignment.ALIGN_CENTER |
| 349 | max = max & ~1; |
| 350 | int half = (right - left - max) >> 1; |
| 351 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 352 | x = right - half; |
| 353 | } else { |
| 354 | x = left + half; |
| 355 | } |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | Directions directions = getLineDirections(i); |
| 360 | boolean hasTab = getLineContainsTab(i); |
| 361 | if (directions == DIRS_ALL_LEFT_TO_RIGHT && |
| 362 | !spannedText && !hasTab) { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 363 | if (DEBUG) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 364 | Assert.assertTrue(dir == DIR_LEFT_TO_RIGHT); |
| 365 | Assert.assertNotNull(c); |
| 366 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 367 | // XXX: assumes there's nothing additional to be done |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 368 | c.drawText(buf, start, end, x, lbaseline, paint); |
| 369 | } else { |
| 370 | drawText(c, buf, start, end, dir, directions, |
| 371 | x, ltop, lbaseline, lbottom, paint, mWorkPaint, |
| 372 | hasTab, spans); |
| 373 | } |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | /** |
| 378 | * Return the text that is displayed by this Layout. |
| 379 | */ |
| 380 | public final CharSequence getText() { |
| 381 | return mText; |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * Return the base Paint properties for this layout. |
| 386 | * Do NOT change the paint, which may result in funny |
| 387 | * drawing for this layout. |
| 388 | */ |
| 389 | public final TextPaint getPaint() { |
| 390 | return mPaint; |
| 391 | } |
| 392 | |
| 393 | /** |
| 394 | * Return the width of this layout. |
| 395 | */ |
| 396 | public final int getWidth() { |
| 397 | return mWidth; |
| 398 | } |
| 399 | |
| 400 | /** |
| 401 | * Return the width to which this Layout is ellipsizing, or |
| 402 | * {@link #getWidth} if it is not doing anything special. |
| 403 | */ |
| 404 | public int getEllipsizedWidth() { |
| 405 | return mWidth; |
| 406 | } |
| 407 | |
| 408 | /** |
| 409 | * Increase the width of this layout to the specified width. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 410 | * Be careful to use this only when you know it is appropriate— |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 411 | * it does not cause the text to reflow to use the full new width. |
| 412 | */ |
| 413 | public final void increaseWidthTo(int wid) { |
| 414 | if (wid < mWidth) { |
| 415 | throw new RuntimeException("attempted to reduce Layout width"); |
| 416 | } |
| 417 | |
| 418 | mWidth = wid; |
| 419 | } |
| 420 | |
| 421 | /** |
| 422 | * Return the total height of this layout. |
| 423 | */ |
| 424 | public int getHeight() { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 425 | return getLineTop(getLineCount()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | /** |
| 429 | * Return the base alignment of this layout. |
| 430 | */ |
| 431 | public final Alignment getAlignment() { |
| 432 | return mAlignment; |
| 433 | } |
| 434 | |
| 435 | /** |
| 436 | * Return what the text height is multiplied by to get the line height. |
| 437 | */ |
| 438 | public final float getSpacingMultiplier() { |
| 439 | return mSpacingMult; |
| 440 | } |
| 441 | |
| 442 | /** |
| 443 | * Return the number of units of leading that are added to each line. |
| 444 | */ |
| 445 | public final float getSpacingAdd() { |
| 446 | return mSpacingAdd; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * Return the number of lines of text in this layout. |
| 451 | */ |
| 452 | public abstract int getLineCount(); |
| 453 | |
| 454 | /** |
| 455 | * Return the baseline for the specified line (0…getLineCount() - 1) |
| 456 | * If bounds is not null, return the top, left, right, bottom extents |
| 457 | * of the specified line in it. |
| 458 | * @param line which line to examine (0..getLineCount() - 1) |
| 459 | * @param bounds Optional. If not null, it returns the extent of the line |
| 460 | * @return the Y-coordinate of the baseline |
| 461 | */ |
| 462 | public int getLineBounds(int line, Rect bounds) { |
| 463 | if (bounds != null) { |
| 464 | bounds.left = 0; // ??? |
| 465 | bounds.top = getLineTop(line); |
| 466 | bounds.right = mWidth; // ??? |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 467 | bounds.bottom = getLineTop(line + 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 468 | } |
| 469 | return getLineBaseline(line); |
| 470 | } |
| 471 | |
| 472 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 473 | * Return the vertical position of the top of the specified line |
| 474 | * (0…getLineCount()). |
| 475 | * If the specified line is equal to the line count, returns the |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 476 | * bottom of the last line. |
| 477 | */ |
| 478 | public abstract int getLineTop(int line); |
| 479 | |
| 480 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 481 | * Return the descent of the specified line(0…getLineCount() - 1). |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 482 | */ |
| 483 | public abstract int getLineDescent(int line); |
| 484 | |
| 485 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 486 | * Return the text offset of the beginning of the specified line ( |
| 487 | * 0…getLineCount()). If the specified line is equal to the line |
| 488 | * count, returns the length of the text. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 489 | */ |
| 490 | public abstract int getLineStart(int line); |
| 491 | |
| 492 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 493 | * Returns the primary directionality of the paragraph containing the |
| 494 | * specified line, either 1 for left-to-right lines, or -1 for right-to-left |
| 495 | * lines (see {@link #DIR_LEFT_TO_RIGHT}, {@link #DIR_RIGHT_TO_LEFT}). |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 496 | */ |
| 497 | public abstract int getParagraphDirection(int line); |
| 498 | |
| 499 | /** |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 500 | * Returns whether the specified line contains one or more |
| 501 | * characters that need to be handled specially, like tabs |
| 502 | * or emoji. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 503 | */ |
| 504 | public abstract boolean getLineContainsTab(int line); |
| 505 | |
| 506 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 507 | * Returns the directional run information for the specified line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 508 | * The array alternates counts of characters in left-to-right |
| 509 | * and right-to-left segments of the line. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 510 | * |
| 511 | * <p>NOTE: this is inadequate to support bidirectional text, and will change. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 512 | */ |
| 513 | public abstract Directions getLineDirections(int line); |
| 514 | |
| 515 | /** |
| 516 | * Returns the (negative) number of extra pixels of ascent padding in the |
| 517 | * top line of the Layout. |
| 518 | */ |
| 519 | public abstract int getTopPadding(); |
| 520 | |
| 521 | /** |
| 522 | * Returns the number of extra pixels of descent padding in the |
| 523 | * bottom line of the Layout. |
| 524 | */ |
| 525 | public abstract int getBottomPadding(); |
| 526 | |
| 527 | /** |
| 528 | * Get the primary horizontal position for the specified text offset. |
| 529 | * This is the location where a new character would be inserted in |
| 530 | * the paragraph's primary direction. |
| 531 | */ |
| 532 | public float getPrimaryHorizontal(int offset) { |
| 533 | return getHorizontal(offset, false, true); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * Get the secondary horizontal position for the specified text offset. |
| 538 | * This is the location where a new character would be inserted in |
| 539 | * the direction other than the paragraph's primary direction. |
| 540 | */ |
| 541 | public float getSecondaryHorizontal(int offset) { |
| 542 | return getHorizontal(offset, true, true); |
| 543 | } |
| 544 | |
| 545 | private float getHorizontal(int offset, boolean trailing, boolean alt) { |
| 546 | int line = getLineForOffset(offset); |
| 547 | |
| 548 | return getHorizontal(offset, trailing, alt, line); |
| 549 | } |
| 550 | |
| 551 | private float getHorizontal(int offset, boolean trailing, boolean alt, |
| 552 | int line) { |
| 553 | int start = getLineStart(line); |
| 554 | int end = getLineVisibleEnd(line); |
| 555 | int dir = getParagraphDirection(line); |
| 556 | boolean tab = getLineContainsTab(line); |
| 557 | Directions directions = getLineDirections(line); |
| 558 | |
| 559 | TabStopSpan[] tabs = null; |
| 560 | if (tab && mText instanceof Spanned) { |
| 561 | tabs = ((Spanned) mText).getSpans(start, end, TabStopSpan.class); |
| 562 | } |
| 563 | |
| 564 | float wid = measureText(mPaint, mWorkPaint, mText, start, offset, end, |
| 565 | dir, directions, trailing, alt, tab, tabs); |
| 566 | |
| 567 | if (offset > end) { |
| 568 | if (dir == DIR_RIGHT_TO_LEFT) |
| 569 | wid -= measureText(mPaint, mWorkPaint, |
| 570 | mText, end, offset, null, tab, tabs); |
| 571 | else |
| 572 | wid += measureText(mPaint, mWorkPaint, |
| 573 | mText, end, offset, null, tab, tabs); |
| 574 | } |
| 575 | |
| 576 | Alignment align = getParagraphAlignment(line); |
| 577 | int left = getParagraphLeft(line); |
| 578 | int right = getParagraphRight(line); |
| 579 | |
| 580 | if (align == Alignment.ALIGN_NORMAL) { |
| 581 | if (dir == DIR_RIGHT_TO_LEFT) |
| 582 | return right + wid; |
| 583 | else |
| 584 | return left + wid; |
| 585 | } |
| 586 | |
| 587 | float max = getLineMax(line); |
| 588 | |
| 589 | if (align == Alignment.ALIGN_OPPOSITE) { |
| 590 | if (dir == DIR_RIGHT_TO_LEFT) |
| 591 | return left + max + wid; |
| 592 | else |
| 593 | return right - max + wid; |
| 594 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 595 | int imax = ((int) max) & ~1; |
| 596 | |
| 597 | if (dir == DIR_RIGHT_TO_LEFT) |
| 598 | return right - (((right - left) - imax) / 2) + wid; |
| 599 | else |
| 600 | return left + ((right - left) - imax) / 2 + wid; |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | /** |
| 605 | * Get the leftmost position that should be exposed for horizontal |
| 606 | * scrolling on the specified line. |
| 607 | */ |
| 608 | public float getLineLeft(int line) { |
| 609 | int dir = getParagraphDirection(line); |
| 610 | Alignment align = getParagraphAlignment(line); |
| 611 | |
| 612 | if (align == Alignment.ALIGN_NORMAL) { |
| 613 | if (dir == DIR_RIGHT_TO_LEFT) |
| 614 | return getParagraphRight(line) - getLineMax(line); |
| 615 | else |
| 616 | return 0; |
| 617 | } else if (align == Alignment.ALIGN_OPPOSITE) { |
| 618 | if (dir == DIR_RIGHT_TO_LEFT) |
| 619 | return 0; |
| 620 | else |
| 621 | return mWidth - getLineMax(line); |
| 622 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 623 | int left = getParagraphLeft(line); |
| 624 | int right = getParagraphRight(line); |
| 625 | int max = ((int) getLineMax(line)) & ~1; |
| 626 | |
| 627 | return left + ((right - left) - max) / 2; |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Get the rightmost position that should be exposed for horizontal |
| 633 | * scrolling on the specified line. |
| 634 | */ |
| 635 | public float getLineRight(int line) { |
| 636 | int dir = getParagraphDirection(line); |
| 637 | Alignment align = getParagraphAlignment(line); |
| 638 | |
| 639 | if (align == Alignment.ALIGN_NORMAL) { |
| 640 | if (dir == DIR_RIGHT_TO_LEFT) |
| 641 | return mWidth; |
| 642 | else |
| 643 | return getParagraphLeft(line) + getLineMax(line); |
| 644 | } else if (align == Alignment.ALIGN_OPPOSITE) { |
| 645 | if (dir == DIR_RIGHT_TO_LEFT) |
| 646 | return getLineMax(line); |
| 647 | else |
| 648 | return mWidth; |
| 649 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 650 | int left = getParagraphLeft(line); |
| 651 | int right = getParagraphRight(line); |
| 652 | int max = ((int) getLineMax(line)) & ~1; |
| 653 | |
| 654 | return right - ((right - left) - max) / 2; |
| 655 | } |
| 656 | } |
| 657 | |
| 658 | /** |
| 659 | * Gets the horizontal extent of the specified line, excluding |
| 660 | * trailing whitespace. |
| 661 | */ |
| 662 | public float getLineMax(int line) { |
| 663 | return getLineMax(line, null, false); |
| 664 | } |
| 665 | |
| 666 | /** |
| 667 | * Gets the horizontal extent of the specified line, including |
| 668 | * trailing whitespace. |
| 669 | */ |
| 670 | public float getLineWidth(int line) { |
| 671 | return getLineMax(line, null, true); |
| 672 | } |
| 673 | |
| 674 | private float getLineMax(int line, Object[] tabs, boolean full) { |
| 675 | int start = getLineStart(line); |
| 676 | int end; |
| 677 | |
| 678 | if (full) { |
| 679 | end = getLineEnd(line); |
| 680 | } else { |
| 681 | end = getLineVisibleEnd(line); |
| 682 | } |
| 683 | boolean tab = getLineContainsTab(line); |
| 684 | |
| 685 | if (tabs == null && tab && mText instanceof Spanned) { |
| 686 | tabs = ((Spanned) mText).getSpans(start, end, TabStopSpan.class); |
| 687 | } |
| 688 | |
| 689 | return measureText(mPaint, mWorkPaint, |
| 690 | mText, start, end, null, tab, tabs); |
| 691 | } |
| 692 | |
| 693 | /** |
| 694 | * Get the line number corresponding to the specified vertical position. |
| 695 | * If you ask for a position above 0, you get 0; if you ask for a position |
| 696 | * below the bottom of the text, you get the last line. |
| 697 | */ |
| 698 | // FIXME: It may be faster to do a linear search for layouts without many lines. |
| 699 | public int getLineForVertical(int vertical) { |
| 700 | int high = getLineCount(), low = -1, guess; |
| 701 | |
| 702 | while (high - low > 1) { |
| 703 | guess = (high + low) / 2; |
| 704 | |
| 705 | if (getLineTop(guess) > vertical) |
| 706 | high = guess; |
| 707 | else |
| 708 | low = guess; |
| 709 | } |
| 710 | |
| 711 | if (low < 0) |
| 712 | return 0; |
| 713 | else |
| 714 | return low; |
| 715 | } |
| 716 | |
| 717 | /** |
| 718 | * Get the line number on which the specified text offset appears. |
| 719 | * If you ask for a position before 0, you get 0; if you ask for a position |
| 720 | * beyond the end of the text, you get the last line. |
| 721 | */ |
| 722 | public int getLineForOffset(int offset) { |
| 723 | int high = getLineCount(), low = -1, guess; |
| 724 | |
| 725 | while (high - low > 1) { |
| 726 | guess = (high + low) / 2; |
| 727 | |
| 728 | if (getLineStart(guess) > offset) |
| 729 | high = guess; |
| 730 | else |
| 731 | low = guess; |
| 732 | } |
| 733 | |
| 734 | if (low < 0) |
| 735 | return 0; |
| 736 | else |
| 737 | return low; |
| 738 | } |
| 739 | |
| 740 | /** |
| 741 | * Get the character offset on the specfied line whose position is |
| 742 | * closest to the specified horizontal position. |
| 743 | */ |
| 744 | public int getOffsetForHorizontal(int line, float horiz) { |
| 745 | int max = getLineEnd(line) - 1; |
| 746 | int min = getLineStart(line); |
| 747 | Directions dirs = getLineDirections(line); |
| 748 | |
| 749 | if (line == getLineCount() - 1) |
| 750 | max++; |
| 751 | |
| 752 | int best = min; |
| 753 | float bestdist = Math.abs(getPrimaryHorizontal(best) - horiz); |
| 754 | |
| 755 | int here = min; |
| 756 | for (int i = 0; i < dirs.mDirections.length; i++) { |
| 757 | int there = here + dirs.mDirections[i]; |
| 758 | int swap = ((i & 1) == 0) ? 1 : -1; |
| 759 | |
| 760 | if (there > max) |
| 761 | there = max; |
| 762 | |
| 763 | int high = there - 1 + 1, low = here + 1 - 1, guess; |
| 764 | |
| 765 | while (high - low > 1) { |
| 766 | guess = (high + low) / 2; |
| 767 | int adguess = getOffsetAtStartOf(guess); |
| 768 | |
| 769 | if (getPrimaryHorizontal(adguess) * swap >= horiz * swap) |
| 770 | high = guess; |
| 771 | else |
| 772 | low = guess; |
| 773 | } |
| 774 | |
| 775 | if (low < here + 1) |
| 776 | low = here + 1; |
| 777 | |
| 778 | if (low < there) { |
| 779 | low = getOffsetAtStartOf(low); |
| 780 | |
| 781 | float dist = Math.abs(getPrimaryHorizontal(low) - horiz); |
| 782 | |
| 783 | int aft = TextUtils.getOffsetAfter(mText, low); |
| 784 | if (aft < there) { |
| 785 | float other = Math.abs(getPrimaryHorizontal(aft) - horiz); |
| 786 | |
| 787 | if (other < dist) { |
| 788 | dist = other; |
| 789 | low = aft; |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | if (dist < bestdist) { |
| 794 | bestdist = dist; |
| 795 | best = low; |
| 796 | } |
| 797 | } |
| 798 | |
| 799 | float dist = Math.abs(getPrimaryHorizontal(here) - horiz); |
| 800 | |
| 801 | if (dist < bestdist) { |
| 802 | bestdist = dist; |
| 803 | best = here; |
| 804 | } |
| 805 | |
| 806 | here = there; |
| 807 | } |
| 808 | |
| 809 | float dist = Math.abs(getPrimaryHorizontal(max) - horiz); |
| 810 | |
| 811 | if (dist < bestdist) { |
| 812 | bestdist = dist; |
| 813 | best = max; |
| 814 | } |
| 815 | |
| 816 | return best; |
| 817 | } |
| 818 | |
| 819 | /** |
| 820 | * Return the text offset after the last character on the specified line. |
| 821 | */ |
| 822 | public final int getLineEnd(int line) { |
| 823 | return getLineStart(line + 1); |
| 824 | } |
| 825 | |
| 826 | /** |
| 827 | * Return the text offset after the last visible character (so whitespace |
| 828 | * is not counted) on the specified line. |
| 829 | */ |
| 830 | public int getLineVisibleEnd(int line) { |
| 831 | return getLineVisibleEnd(line, getLineStart(line), getLineStart(line+1)); |
| 832 | } |
| 833 | |
| 834 | private int getLineVisibleEnd(int line, int start, int end) { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 835 | if (DEBUG) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 836 | Assert.assertTrue(getLineStart(line) == start && getLineStart(line+1) == end); |
| 837 | } |
| 838 | |
| 839 | CharSequence text = mText; |
| 840 | char ch; |
| 841 | if (line == getLineCount() - 1) { |
| 842 | return end; |
| 843 | } |
| 844 | |
| 845 | for (; end > start; end--) { |
| 846 | ch = text.charAt(end - 1); |
| 847 | |
| 848 | if (ch == '\n') { |
| 849 | return end - 1; |
| 850 | } |
| 851 | |
| 852 | if (ch != ' ' && ch != '\t') { |
| 853 | break; |
| 854 | } |
| 855 | |
| 856 | } |
| 857 | |
| 858 | return end; |
| 859 | } |
| 860 | |
| 861 | /** |
| 862 | * Return the vertical position of the bottom of the specified line. |
| 863 | */ |
| 864 | public final int getLineBottom(int line) { |
| 865 | return getLineTop(line + 1); |
| 866 | } |
| 867 | |
| 868 | /** |
| 869 | * Return the vertical position of the baseline of the specified line. |
| 870 | */ |
| 871 | public final int getLineBaseline(int line) { |
| 872 | // getLineTop(line+1) == getLineTop(line) |
| 873 | return getLineTop(line+1) - getLineDescent(line); |
| 874 | } |
| 875 | |
| 876 | /** |
| 877 | * Get the ascent of the text on the specified line. |
| 878 | * The return value is negative to match the Paint.ascent() convention. |
| 879 | */ |
| 880 | public final int getLineAscent(int line) { |
| 881 | // getLineTop(line+1) - getLineDescent(line) == getLineBaseLine(line) |
| 882 | return getLineTop(line) - (getLineTop(line+1) - getLineDescent(line)); |
| 883 | } |
| 884 | |
| 885 | /** |
| 886 | * Return the text offset that would be reached by moving left |
| 887 | * (possibly onto another line) from the specified offset. |
| 888 | */ |
| 889 | public int getOffsetToLeftOf(int offset) { |
| 890 | int line = getLineForOffset(offset); |
| 891 | int start = getLineStart(line); |
| 892 | int end = getLineEnd(line); |
| 893 | Directions dirs = getLineDirections(line); |
| 894 | |
| 895 | if (line != getLineCount() - 1) |
| 896 | end--; |
| 897 | |
| 898 | float horiz = getPrimaryHorizontal(offset); |
| 899 | |
| 900 | int best = offset; |
| 901 | float besth = Integer.MIN_VALUE; |
| 902 | int candidate; |
| 903 | |
| 904 | candidate = TextUtils.getOffsetBefore(mText, offset); |
| 905 | if (candidate >= start && candidate <= end) { |
| 906 | float h = getPrimaryHorizontal(candidate); |
| 907 | |
| 908 | if (h < horiz && h > besth) { |
| 909 | best = candidate; |
| 910 | besth = h; |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | candidate = TextUtils.getOffsetAfter(mText, offset); |
| 915 | if (candidate >= start && candidate <= end) { |
| 916 | float h = getPrimaryHorizontal(candidate); |
| 917 | |
| 918 | if (h < horiz && h > besth) { |
| 919 | best = candidate; |
| 920 | besth = h; |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | int here = start; |
| 925 | for (int i = 0; i < dirs.mDirections.length; i++) { |
| 926 | int there = here + dirs.mDirections[i]; |
| 927 | if (there > end) |
| 928 | there = end; |
| 929 | |
| 930 | float h = getPrimaryHorizontal(here); |
| 931 | |
| 932 | if (h < horiz && h > besth) { |
| 933 | best = here; |
| 934 | besth = h; |
| 935 | } |
| 936 | |
| 937 | candidate = TextUtils.getOffsetAfter(mText, here); |
| 938 | if (candidate >= start && candidate <= end) { |
| 939 | h = getPrimaryHorizontal(candidate); |
| 940 | |
| 941 | if (h < horiz && h > besth) { |
| 942 | best = candidate; |
| 943 | besth = h; |
| 944 | } |
| 945 | } |
| 946 | |
| 947 | candidate = TextUtils.getOffsetBefore(mText, there); |
| 948 | if (candidate >= start && candidate <= end) { |
| 949 | h = getPrimaryHorizontal(candidate); |
| 950 | |
| 951 | if (h < horiz && h > besth) { |
| 952 | best = candidate; |
| 953 | besth = h; |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | here = there; |
| 958 | } |
| 959 | |
| 960 | float h = getPrimaryHorizontal(end); |
| 961 | |
| 962 | if (h < horiz && h > besth) { |
| 963 | best = end; |
| 964 | besth = h; |
| 965 | } |
| 966 | |
| 967 | if (best != offset) |
| 968 | return best; |
| 969 | |
| 970 | int dir = getParagraphDirection(line); |
| 971 | |
| 972 | if (dir > 0) { |
| 973 | if (line == 0) |
| 974 | return best; |
| 975 | else |
| 976 | return getOffsetForHorizontal(line - 1, 10000); |
| 977 | } else { |
| 978 | if (line == getLineCount() - 1) |
| 979 | return best; |
| 980 | else |
| 981 | return getOffsetForHorizontal(line + 1, 10000); |
| 982 | } |
| 983 | } |
| 984 | |
| 985 | /** |
| 986 | * Return the text offset that would be reached by moving right |
| 987 | * (possibly onto another line) from the specified offset. |
| 988 | */ |
| 989 | public int getOffsetToRightOf(int offset) { |
| 990 | int line = getLineForOffset(offset); |
| 991 | int start = getLineStart(line); |
| 992 | int end = getLineEnd(line); |
| 993 | Directions dirs = getLineDirections(line); |
| 994 | |
| 995 | if (line != getLineCount() - 1) |
| 996 | end--; |
| 997 | |
| 998 | float horiz = getPrimaryHorizontal(offset); |
| 999 | |
| 1000 | int best = offset; |
| 1001 | float besth = Integer.MAX_VALUE; |
| 1002 | int candidate; |
| 1003 | |
| 1004 | candidate = TextUtils.getOffsetBefore(mText, offset); |
| 1005 | if (candidate >= start && candidate <= end) { |
| 1006 | float h = getPrimaryHorizontal(candidate); |
| 1007 | |
| 1008 | if (h > horiz && h < besth) { |
| 1009 | best = candidate; |
| 1010 | besth = h; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | candidate = TextUtils.getOffsetAfter(mText, offset); |
| 1015 | if (candidate >= start && candidate <= end) { |
| 1016 | float h = getPrimaryHorizontal(candidate); |
| 1017 | |
| 1018 | if (h > horiz && h < besth) { |
| 1019 | best = candidate; |
| 1020 | besth = h; |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | int here = start; |
| 1025 | for (int i = 0; i < dirs.mDirections.length; i++) { |
| 1026 | int there = here + dirs.mDirections[i]; |
| 1027 | if (there > end) |
| 1028 | there = end; |
| 1029 | |
| 1030 | float h = getPrimaryHorizontal(here); |
| 1031 | |
| 1032 | if (h > horiz && h < besth) { |
| 1033 | best = here; |
| 1034 | besth = h; |
| 1035 | } |
| 1036 | |
| 1037 | candidate = TextUtils.getOffsetAfter(mText, here); |
| 1038 | if (candidate >= start && candidate <= end) { |
| 1039 | h = getPrimaryHorizontal(candidate); |
| 1040 | |
| 1041 | if (h > horiz && h < besth) { |
| 1042 | best = candidate; |
| 1043 | besth = h; |
| 1044 | } |
| 1045 | } |
| 1046 | |
| 1047 | candidate = TextUtils.getOffsetBefore(mText, there); |
| 1048 | if (candidate >= start && candidate <= end) { |
| 1049 | h = getPrimaryHorizontal(candidate); |
| 1050 | |
| 1051 | if (h > horiz && h < besth) { |
| 1052 | best = candidate; |
| 1053 | besth = h; |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | here = there; |
| 1058 | } |
| 1059 | |
| 1060 | float h = getPrimaryHorizontal(end); |
| 1061 | |
| 1062 | if (h > horiz && h < besth) { |
| 1063 | best = end; |
| 1064 | besth = h; |
| 1065 | } |
| 1066 | |
| 1067 | if (best != offset) |
| 1068 | return best; |
| 1069 | |
| 1070 | int dir = getParagraphDirection(line); |
| 1071 | |
| 1072 | if (dir > 0) { |
| 1073 | if (line == getLineCount() - 1) |
| 1074 | return best; |
| 1075 | else |
| 1076 | return getOffsetForHorizontal(line + 1, -10000); |
| 1077 | } else { |
| 1078 | if (line == 0) |
| 1079 | return best; |
| 1080 | else |
| 1081 | return getOffsetForHorizontal(line - 1, -10000); |
| 1082 | } |
| 1083 | } |
| 1084 | |
| 1085 | private int getOffsetAtStartOf(int offset) { |
| 1086 | if (offset == 0) |
| 1087 | return 0; |
| 1088 | |
| 1089 | CharSequence text = mText; |
| 1090 | char c = text.charAt(offset); |
| 1091 | |
| 1092 | if (c >= '\uDC00' && c <= '\uDFFF') { |
| 1093 | char c1 = text.charAt(offset - 1); |
| 1094 | |
| 1095 | if (c1 >= '\uD800' && c1 <= '\uDBFF') |
| 1096 | offset -= 1; |
| 1097 | } |
| 1098 | |
| 1099 | if (mSpannedText) { |
| 1100 | ReplacementSpan[] spans = ((Spanned) text).getSpans(offset, offset, |
| 1101 | ReplacementSpan.class); |
| 1102 | |
| 1103 | for (int i = 0; i < spans.length; i++) { |
| 1104 | int start = ((Spanned) text).getSpanStart(spans[i]); |
| 1105 | int end = ((Spanned) text).getSpanEnd(spans[i]); |
| 1106 | |
| 1107 | if (start < offset && end > offset) |
| 1108 | offset = start; |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | return offset; |
| 1113 | } |
| 1114 | |
| 1115 | /** |
| 1116 | * Fills in the specified Path with a representation of a cursor |
| 1117 | * at the specified offset. This will often be a vertical line |
| 1118 | * but can be multiple discontinous lines in text with multiple |
| 1119 | * directionalities. |
| 1120 | */ |
| 1121 | public void getCursorPath(int point, Path dest, |
| 1122 | CharSequence editingBuffer) { |
| 1123 | dest.reset(); |
| 1124 | |
| 1125 | int line = getLineForOffset(point); |
| 1126 | int top = getLineTop(line); |
| 1127 | int bottom = getLineTop(line+1); |
| 1128 | |
| 1129 | float h1 = getPrimaryHorizontal(point) - 0.5f; |
| 1130 | float h2 = getSecondaryHorizontal(point) - 0.5f; |
| 1131 | |
| 1132 | int caps = TextKeyListener.getMetaState(editingBuffer, |
| 1133 | KeyEvent.META_SHIFT_ON) | |
| 1134 | TextKeyListener.getMetaState(editingBuffer, |
| 1135 | TextKeyListener.META_SELECTING); |
| 1136 | int fn = TextKeyListener.getMetaState(editingBuffer, |
| 1137 | KeyEvent.META_ALT_ON); |
| 1138 | int dist = 0; |
| 1139 | |
| 1140 | if (caps != 0 || fn != 0) { |
| 1141 | dist = (bottom - top) >> 2; |
| 1142 | |
| 1143 | if (fn != 0) |
| 1144 | top += dist; |
| 1145 | if (caps != 0) |
| 1146 | bottom -= dist; |
| 1147 | } |
| 1148 | |
| 1149 | if (h1 < 0.5f) |
| 1150 | h1 = 0.5f; |
| 1151 | if (h2 < 0.5f) |
| 1152 | h2 = 0.5f; |
| 1153 | |
| 1154 | if (h1 == h2) { |
| 1155 | dest.moveTo(h1, top); |
| 1156 | dest.lineTo(h1, bottom); |
| 1157 | } else { |
| 1158 | dest.moveTo(h1, top); |
| 1159 | dest.lineTo(h1, (top + bottom) >> 1); |
| 1160 | |
| 1161 | dest.moveTo(h2, (top + bottom) >> 1); |
| 1162 | dest.lineTo(h2, bottom); |
| 1163 | } |
| 1164 | |
| 1165 | if (caps == 2) { |
| 1166 | dest.moveTo(h2, bottom); |
| 1167 | dest.lineTo(h2 - dist, bottom + dist); |
| 1168 | dest.lineTo(h2, bottom); |
| 1169 | dest.lineTo(h2 + dist, bottom + dist); |
| 1170 | } else if (caps == 1) { |
| 1171 | dest.moveTo(h2, bottom); |
| 1172 | dest.lineTo(h2 - dist, bottom + dist); |
| 1173 | |
| 1174 | dest.moveTo(h2 - dist, bottom + dist - 0.5f); |
| 1175 | dest.lineTo(h2 + dist, bottom + dist - 0.5f); |
| 1176 | |
| 1177 | dest.moveTo(h2 + dist, bottom + dist); |
| 1178 | dest.lineTo(h2, bottom); |
| 1179 | } |
| 1180 | |
| 1181 | if (fn == 2) { |
| 1182 | dest.moveTo(h1, top); |
| 1183 | dest.lineTo(h1 - dist, top - dist); |
| 1184 | dest.lineTo(h1, top); |
| 1185 | dest.lineTo(h1 + dist, top - dist); |
| 1186 | } else if (fn == 1) { |
| 1187 | dest.moveTo(h1, top); |
| 1188 | dest.lineTo(h1 - dist, top - dist); |
| 1189 | |
| 1190 | dest.moveTo(h1 - dist, top - dist + 0.5f); |
| 1191 | dest.lineTo(h1 + dist, top - dist + 0.5f); |
| 1192 | |
| 1193 | dest.moveTo(h1 + dist, top - dist); |
| 1194 | dest.lineTo(h1, top); |
| 1195 | } |
| 1196 | } |
| 1197 | |
| 1198 | private void addSelection(int line, int start, int end, |
| 1199 | int top, int bottom, Path dest) { |
| 1200 | int linestart = getLineStart(line); |
| 1201 | int lineend = getLineEnd(line); |
| 1202 | Directions dirs = getLineDirections(line); |
| 1203 | |
| 1204 | if (lineend > linestart && mText.charAt(lineend - 1) == '\n') |
| 1205 | lineend--; |
| 1206 | |
| 1207 | int here = linestart; |
| 1208 | for (int i = 0; i < dirs.mDirections.length; i++) { |
| 1209 | int there = here + dirs.mDirections[i]; |
| 1210 | if (there > lineend) |
| 1211 | there = lineend; |
| 1212 | |
| 1213 | if (start <= there && end >= here) { |
| 1214 | int st = Math.max(start, here); |
| 1215 | int en = Math.min(end, there); |
| 1216 | |
| 1217 | if (st != en) { |
| 1218 | float h1 = getHorizontal(st, false, false, line); |
| 1219 | float h2 = getHorizontal(en, true, false, line); |
| 1220 | |
| 1221 | dest.addRect(h1, top, h2, bottom, Path.Direction.CW); |
| 1222 | } |
| 1223 | } |
| 1224 | |
| 1225 | here = there; |
| 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | /** |
| 1230 | * Fills in the specified Path with a representation of a highlight |
| 1231 | * between the specified offsets. This will often be a rectangle |
| 1232 | * or a potentially discontinuous set of rectangles. If the start |
| 1233 | * and end are the same, the returned path is empty. |
| 1234 | */ |
| 1235 | public void getSelectionPath(int start, int end, Path dest) { |
| 1236 | dest.reset(); |
| 1237 | |
| 1238 | if (start == end) |
| 1239 | return; |
| 1240 | |
| 1241 | if (end < start) { |
| 1242 | int temp = end; |
| 1243 | end = start; |
| 1244 | start = temp; |
| 1245 | } |
| 1246 | |
| 1247 | int startline = getLineForOffset(start); |
| 1248 | int endline = getLineForOffset(end); |
| 1249 | |
| 1250 | int top = getLineTop(startline); |
| 1251 | int bottom = getLineBottom(endline); |
| 1252 | |
| 1253 | if (startline == endline) { |
| 1254 | addSelection(startline, start, end, top, bottom, dest); |
| 1255 | } else { |
| 1256 | final float width = mWidth; |
| 1257 | |
| 1258 | addSelection(startline, start, getLineEnd(startline), |
| 1259 | top, getLineBottom(startline), dest); |
| 1260 | |
| 1261 | if (getParagraphDirection(startline) == DIR_RIGHT_TO_LEFT) |
| 1262 | dest.addRect(getLineLeft(startline), top, |
| 1263 | 0, getLineBottom(startline), Path.Direction.CW); |
| 1264 | else |
| 1265 | dest.addRect(getLineRight(startline), top, |
| 1266 | width, getLineBottom(startline), Path.Direction.CW); |
| 1267 | |
| 1268 | for (int i = startline + 1; i < endline; i++) { |
| 1269 | top = getLineTop(i); |
| 1270 | bottom = getLineBottom(i); |
| 1271 | dest.addRect(0, top, width, bottom, Path.Direction.CW); |
| 1272 | } |
| 1273 | |
| 1274 | top = getLineTop(endline); |
| 1275 | bottom = getLineBottom(endline); |
| 1276 | |
| 1277 | addSelection(endline, getLineStart(endline), end, |
| 1278 | top, bottom, dest); |
| 1279 | |
| 1280 | if (getParagraphDirection(endline) == DIR_RIGHT_TO_LEFT) |
| 1281 | dest.addRect(width, top, getLineRight(endline), bottom, Path.Direction.CW); |
| 1282 | else |
| 1283 | dest.addRect(0, top, getLineLeft(endline), bottom, Path.Direction.CW); |
| 1284 | } |
| 1285 | } |
| 1286 | |
| 1287 | /** |
| 1288 | * Get the alignment of the specified paragraph, taking into account |
| 1289 | * markup attached to it. |
| 1290 | */ |
| 1291 | public final Alignment getParagraphAlignment(int line) { |
| 1292 | Alignment align = mAlignment; |
| 1293 | |
| 1294 | if (mSpannedText) { |
| 1295 | Spanned sp = (Spanned) mText; |
| 1296 | AlignmentSpan[] spans = sp.getSpans(getLineStart(line), |
| 1297 | getLineEnd(line), |
| 1298 | AlignmentSpan.class); |
| 1299 | |
| 1300 | int spanLength = spans.length; |
| 1301 | if (spanLength > 0) { |
| 1302 | align = spans[spanLength-1].getAlignment(); |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | return align; |
| 1307 | } |
| 1308 | |
| 1309 | /** |
| 1310 | * Get the left edge of the specified paragraph, inset by left margins. |
| 1311 | */ |
| 1312 | public final int getParagraphLeft(int line) { |
| 1313 | int dir = getParagraphDirection(line); |
| 1314 | |
| 1315 | int left = 0; |
| 1316 | |
| 1317 | boolean par = false; |
| 1318 | int off = getLineStart(line); |
| 1319 | if (off == 0 || mText.charAt(off - 1) == '\n') |
| 1320 | par = true; |
| 1321 | |
| 1322 | if (dir == DIR_LEFT_TO_RIGHT) { |
| 1323 | if (mSpannedText) { |
| 1324 | Spanned sp = (Spanned) mText; |
| 1325 | LeadingMarginSpan[] spans = sp.getSpans(getLineStart(line), |
| 1326 | getLineEnd(line), |
| 1327 | LeadingMarginSpan.class); |
| 1328 | |
| 1329 | for (int i = 0; i < spans.length; i++) { |
Mark Wagner | 7b5676e | 2009-10-16 11:44:23 -0700 | [diff] [blame] | 1330 | boolean margin = par; |
| 1331 | LeadingMarginSpan span = spans[i]; |
| 1332 | if (span instanceof LeadingMarginSpan.LeadingMarginSpan2) { |
| 1333 | int count = ((LeadingMarginSpan.LeadingMarginSpan2)span).getLeadingMarginLineCount(); |
| 1334 | margin = count >= line; |
| 1335 | } |
| 1336 | left += span.getLeadingMargin(margin); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1337 | } |
| 1338 | } |
| 1339 | } |
| 1340 | |
| 1341 | return left; |
| 1342 | } |
| 1343 | |
| 1344 | /** |
| 1345 | * Get the right edge of the specified paragraph, inset by right margins. |
| 1346 | */ |
| 1347 | public final int getParagraphRight(int line) { |
| 1348 | int dir = getParagraphDirection(line); |
| 1349 | |
| 1350 | int right = mWidth; |
| 1351 | |
| 1352 | boolean par = false; |
| 1353 | int off = getLineStart(line); |
| 1354 | if (off == 0 || mText.charAt(off - 1) == '\n') |
| 1355 | par = true; |
| 1356 | |
| 1357 | |
| 1358 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 1359 | if (mSpannedText) { |
| 1360 | Spanned sp = (Spanned) mText; |
| 1361 | LeadingMarginSpan[] spans = sp.getSpans(getLineStart(line), |
| 1362 | getLineEnd(line), |
| 1363 | LeadingMarginSpan.class); |
| 1364 | |
| 1365 | for (int i = 0; i < spans.length; i++) { |
| 1366 | right -= spans[i].getLeadingMargin(par); |
| 1367 | } |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | return right; |
| 1372 | } |
| 1373 | |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1374 | private void drawText(Canvas canvas, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1375 | CharSequence text, int start, int end, |
| 1376 | int dir, Directions directions, |
| 1377 | float x, int top, int y, int bottom, |
| 1378 | TextPaint paint, |
| 1379 | TextPaint workPaint, |
| 1380 | boolean hasTabs, Object[] parspans) { |
| 1381 | char[] buf; |
| 1382 | if (!hasTabs) { |
| 1383 | if (directions == DIRS_ALL_LEFT_TO_RIGHT) { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 1384 | if (DEBUG) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1385 | Assert.assertTrue(DIR_LEFT_TO_RIGHT == dir); |
| 1386 | } |
| 1387 | Styled.drawText(canvas, text, start, end, dir, false, x, top, y, bottom, paint, workPaint, false); |
| 1388 | return; |
| 1389 | } |
| 1390 | buf = null; |
| 1391 | } else { |
| 1392 | buf = TextUtils.obtain(end - start); |
| 1393 | TextUtils.getChars(text, start, end, buf, 0); |
| 1394 | } |
| 1395 | |
| 1396 | float h = 0; |
| 1397 | |
| 1398 | int here = 0; |
| 1399 | for (int i = 0; i < directions.mDirections.length; i++) { |
| 1400 | int there = here + directions.mDirections[i]; |
| 1401 | if (there > end - start) |
| 1402 | there = end - start; |
| 1403 | |
| 1404 | int segstart = here; |
| 1405 | for (int j = hasTabs ? here : there; j <= there; j++) { |
| 1406 | if (j == there || buf[j] == '\t') { |
| 1407 | h += Styled.drawText(canvas, text, |
| 1408 | start + segstart, start + j, |
| 1409 | dir, (i & 1) != 0, x + h, |
| 1410 | top, y, bottom, paint, workPaint, |
| 1411 | start + j != end); |
| 1412 | |
| 1413 | if (j != there && buf[j] == '\t') |
| 1414 | h = dir * nextTab(text, start, end, h * dir, parspans); |
| 1415 | |
| 1416 | segstart = j + 1; |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1417 | } else if (hasTabs && buf[j] >= 0xD800 && buf[j] <= 0xDFFF && j + 1 < there) { |
| 1418 | int emoji = Character.codePointAt(buf, j); |
| 1419 | |
| 1420 | if (emoji >= MIN_EMOJI && emoji <= MAX_EMOJI) { |
| 1421 | Bitmap bm = EMOJI_FACTORY. |
| 1422 | getBitmapFromAndroidPua(emoji); |
| 1423 | |
| 1424 | if (bm != null) { |
| 1425 | h += Styled.drawText(canvas, text, |
| 1426 | start + segstart, start + j, |
| 1427 | dir, (i & 1) != 0, x + h, |
| 1428 | top, y, bottom, paint, workPaint, |
| 1429 | start + j != end); |
| 1430 | |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1431 | if (mEmojiRect == null) { |
| 1432 | mEmojiRect = new RectF(); |
| 1433 | } |
| 1434 | |
| 1435 | workPaint.set(paint); |
| 1436 | Styled.measureText(paint, workPaint, text, |
| 1437 | start + j, start + j + 1, |
| 1438 | null); |
| 1439 | |
| 1440 | float bitmapHeight = bm.getHeight(); |
| 1441 | float textHeight = -workPaint.ascent(); |
| 1442 | float scale = textHeight / bitmapHeight; |
| 1443 | float width = bm.getWidth() * scale; |
| 1444 | |
| 1445 | mEmojiRect.set(x + h, y - textHeight, |
| 1446 | x + h + width, y); |
| 1447 | |
| 1448 | canvas.drawBitmap(bm, null, mEmojiRect, paint); |
| 1449 | h += width; |
| 1450 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1451 | j++; |
| 1452 | segstart = j + 1; |
| 1453 | } |
| 1454 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1455 | } |
| 1456 | } |
| 1457 | |
| 1458 | here = there; |
| 1459 | } |
| 1460 | |
| 1461 | if (hasTabs) |
| 1462 | TextUtils.recycle(buf); |
| 1463 | } |
| 1464 | |
| 1465 | private static float measureText(TextPaint paint, |
| 1466 | TextPaint workPaint, |
| 1467 | CharSequence text, |
| 1468 | int start, int offset, int end, |
| 1469 | int dir, Directions directions, |
| 1470 | boolean trailing, boolean alt, |
| 1471 | boolean hasTabs, Object[] tabs) { |
| 1472 | char[] buf = null; |
| 1473 | |
| 1474 | if (hasTabs) { |
| 1475 | buf = TextUtils.obtain(end - start); |
| 1476 | TextUtils.getChars(text, start, end, buf, 0); |
| 1477 | } |
| 1478 | |
| 1479 | float h = 0; |
| 1480 | |
| 1481 | if (alt) { |
| 1482 | if (dir == DIR_RIGHT_TO_LEFT) |
| 1483 | trailing = !trailing; |
| 1484 | } |
| 1485 | |
| 1486 | int here = 0; |
| 1487 | for (int i = 0; i < directions.mDirections.length; i++) { |
| 1488 | if (alt) |
| 1489 | trailing = !trailing; |
| 1490 | |
| 1491 | int there = here + directions.mDirections[i]; |
| 1492 | if (there > end - start) |
| 1493 | there = end - start; |
| 1494 | |
| 1495 | int segstart = here; |
| 1496 | for (int j = hasTabs ? here : there; j <= there; j++) { |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1497 | int codept = 0; |
| 1498 | Bitmap bm = null; |
| 1499 | |
| 1500 | if (hasTabs && j < there) { |
| 1501 | codept = buf[j]; |
| 1502 | } |
| 1503 | |
| 1504 | if (codept >= 0xD800 && codept <= 0xDFFF && j + 1 < there) { |
| 1505 | codept = Character.codePointAt(buf, j); |
| 1506 | |
| 1507 | if (codept >= MIN_EMOJI && codept <= MAX_EMOJI) { |
| 1508 | bm = EMOJI_FACTORY.getBitmapFromAndroidPua(codept); |
| 1509 | } |
| 1510 | } |
| 1511 | |
| 1512 | if (j == there || codept == '\t' || bm != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1513 | float segw; |
| 1514 | |
| 1515 | if (offset < start + j || |
| 1516 | (trailing && offset <= start + j)) { |
| 1517 | if (dir == DIR_LEFT_TO_RIGHT && (i & 1) == 0) { |
| 1518 | h += Styled.measureText(paint, workPaint, text, |
| 1519 | start + segstart, offset, |
| 1520 | null); |
| 1521 | return h; |
| 1522 | } |
| 1523 | |
| 1524 | if (dir == DIR_RIGHT_TO_LEFT && (i & 1) != 0) { |
| 1525 | h -= Styled.measureText(paint, workPaint, text, |
| 1526 | start + segstart, offset, |
| 1527 | null); |
| 1528 | return h; |
| 1529 | } |
| 1530 | } |
| 1531 | |
| 1532 | segw = Styled.measureText(paint, workPaint, text, |
| 1533 | start + segstart, start + j, |
| 1534 | null); |
| 1535 | |
| 1536 | if (offset < start + j || |
| 1537 | (trailing && offset <= start + j)) { |
| 1538 | if (dir == DIR_LEFT_TO_RIGHT) { |
| 1539 | h += segw - Styled.measureText(paint, workPaint, |
| 1540 | text, |
| 1541 | start + segstart, |
| 1542 | offset, null); |
| 1543 | return h; |
| 1544 | } |
| 1545 | |
| 1546 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 1547 | h -= segw - Styled.measureText(paint, workPaint, |
| 1548 | text, |
| 1549 | start + segstart, |
| 1550 | offset, null); |
| 1551 | return h; |
| 1552 | } |
| 1553 | } |
| 1554 | |
| 1555 | if (dir == DIR_RIGHT_TO_LEFT) |
| 1556 | h -= segw; |
| 1557 | else |
| 1558 | h += segw; |
| 1559 | |
| 1560 | if (j != there && buf[j] == '\t') { |
| 1561 | if (offset == start + j) |
| 1562 | return h; |
| 1563 | |
| 1564 | h = dir * nextTab(text, start, end, h * dir, tabs); |
| 1565 | } |
| 1566 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1567 | if (bm != null) { |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1568 | workPaint.set(paint); |
| 1569 | Styled.measureText(paint, workPaint, text, |
Eric Fischer | a82e99a | 2009-08-31 15:14:35 -0700 | [diff] [blame] | 1570 | j, j + 2, null); |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1571 | |
| 1572 | float wid = (float) bm.getWidth() * |
| 1573 | -workPaint.ascent() / bm.getHeight(); |
| 1574 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1575 | if (dir == DIR_RIGHT_TO_LEFT) { |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1576 | h -= wid; |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1577 | } else { |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1578 | h += wid; |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1579 | } |
| 1580 | |
| 1581 | j++; |
| 1582 | } |
| 1583 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1584 | segstart = j + 1; |
| 1585 | } |
| 1586 | } |
| 1587 | |
| 1588 | here = there; |
| 1589 | } |
| 1590 | |
| 1591 | if (hasTabs) |
| 1592 | TextUtils.recycle(buf); |
| 1593 | |
| 1594 | return h; |
| 1595 | } |
| 1596 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1597 | /** |
| 1598 | * Measure width of a run of text on a single line that is known to all be |
| 1599 | * in the same direction as the paragraph base direction. Returns the width, |
| 1600 | * and the line metrics in fm if fm is not null. |
| 1601 | * |
| 1602 | * @param paint the paint for the text; will not be modified |
| 1603 | * @param workPaint paint available for modification |
| 1604 | * @param text text |
| 1605 | * @param start start of the line |
| 1606 | * @param end limit of the line |
| 1607 | * @param fm object to return integer metrics in, can be null |
| 1608 | * @param hasTabs true if it is known that the line has tabs |
| 1609 | * @param tabs tab position information |
| 1610 | * @return the width of the text from start to end |
| 1611 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1612 | /* package */ static float measureText(TextPaint paint, |
| 1613 | TextPaint workPaint, |
| 1614 | CharSequence text, |
| 1615 | int start, int end, |
| 1616 | Paint.FontMetricsInt fm, |
| 1617 | boolean hasTabs, Object[] tabs) { |
| 1618 | char[] buf = null; |
| 1619 | |
| 1620 | if (hasTabs) { |
| 1621 | buf = TextUtils.obtain(end - start); |
| 1622 | TextUtils.getChars(text, start, end, buf, 0); |
| 1623 | } |
| 1624 | |
| 1625 | int len = end - start; |
| 1626 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1627 | int lastPos = 0; |
| 1628 | float width = 0; |
| 1629 | int ascent = 0, descent = 0, top = 0, bottom = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1630 | |
| 1631 | if (fm != null) { |
| 1632 | fm.ascent = 0; |
| 1633 | fm.descent = 0; |
| 1634 | } |
| 1635 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1636 | for (int pos = hasTabs ? 0 : len; pos <= len; pos++) { |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1637 | int codept = 0; |
| 1638 | Bitmap bm = null; |
| 1639 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1640 | if (hasTabs && pos < len) { |
| 1641 | codept = buf[pos]; |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1642 | } |
| 1643 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1644 | if (codept >= 0xD800 && codept <= 0xDFFF && pos < len) { |
| 1645 | codept = Character.codePointAt(buf, pos); |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1646 | |
| 1647 | if (codept >= MIN_EMOJI && codept <= MAX_EMOJI) { |
| 1648 | bm = EMOJI_FACTORY.getBitmapFromAndroidPua(codept); |
| 1649 | } |
| 1650 | } |
| 1651 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1652 | if (pos == len || codept == '\t' || bm != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1653 | workPaint.baselineShift = 0; |
| 1654 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1655 | width += Styled.measureText(paint, workPaint, text, |
| 1656 | start + lastPos, start + pos, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1657 | fm); |
| 1658 | |
| 1659 | if (fm != null) { |
| 1660 | if (workPaint.baselineShift < 0) { |
| 1661 | fm.ascent += workPaint.baselineShift; |
| 1662 | fm.top += workPaint.baselineShift; |
| 1663 | } else { |
| 1664 | fm.descent += workPaint.baselineShift; |
| 1665 | fm.bottom += workPaint.baselineShift; |
| 1666 | } |
| 1667 | } |
| 1668 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1669 | if (pos != len) { |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1670 | if (bm == null) { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1671 | // no emoji, must have hit a tab |
| 1672 | width = nextTab(text, start, end, width, tabs); |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1673 | } else { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1674 | // This sets up workPaint with the font on the emoji |
| 1675 | // text, so that we can extract the ascent and scale. |
| 1676 | |
| 1677 | // We can't use the result of the previous call to |
| 1678 | // measureText because the emoji might have its own style. |
| 1679 | // We have to initialize workPaint here because if the |
| 1680 | // text is unstyled measureText might not use workPaint |
| 1681 | // at all. |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1682 | workPaint.set(paint); |
| 1683 | Styled.measureText(paint, workPaint, text, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1684 | start + pos, start + pos + 1, null); |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1685 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1686 | width += (float) bm.getWidth() * |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 1687 | -workPaint.ascent() / bm.getHeight(); |
| 1688 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1689 | // Since we had an emoji, we bump past the second half |
| 1690 | // of the surrogate pair. |
| 1691 | pos++; |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1692 | } |
| 1693 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1694 | |
| 1695 | if (fm != null) { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1696 | if (fm.ascent < ascent) { |
| 1697 | ascent = fm.ascent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1698 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1699 | if (fm.descent > descent) { |
| 1700 | descent = fm.descent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1701 | } |
| 1702 | |
| 1703 | if (fm.top < top) { |
| 1704 | top = fm.top; |
| 1705 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1706 | if (fm.bottom > bottom) { |
| 1707 | bottom = fm.bottom; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1708 | } |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 1709 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1710 | // No need to take bitmap height into account here, |
| 1711 | // since it is scaled to match the text height. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1712 | } |
| 1713 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1714 | lastPos = pos + 1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1715 | } |
| 1716 | } |
| 1717 | |
| 1718 | if (fm != null) { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1719 | fm.ascent = ascent; |
| 1720 | fm.descent = descent; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1721 | fm.top = top; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1722 | fm.bottom = bottom; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1723 | } |
| 1724 | |
| 1725 | if (hasTabs) |
| 1726 | TextUtils.recycle(buf); |
| 1727 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1728 | return width; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1729 | } |
| 1730 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1731 | /** |
| 1732 | * Returns the position of the next tab stop after h on the line. |
| 1733 | * |
| 1734 | * @param text the text |
| 1735 | * @param start start of the line |
| 1736 | * @param end limit of the line |
| 1737 | * @param h the current horizontal offset |
| 1738 | * @param tabs the tabs, can be null. If it is null, any tabs in effect |
| 1739 | * on the line will be used. If there are no tabs, a default offset |
| 1740 | * will be used to compute the tab stop. |
| 1741 | * @return the offset of the next tab stop. |
| 1742 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1743 | /* package */ static float nextTab(CharSequence text, int start, int end, |
| 1744 | float h, Object[] tabs) { |
| 1745 | float nh = Float.MAX_VALUE; |
| 1746 | boolean alltabs = false; |
| 1747 | |
| 1748 | if (text instanceof Spanned) { |
| 1749 | if (tabs == null) { |
| 1750 | tabs = ((Spanned) text).getSpans(start, end, TabStopSpan.class); |
| 1751 | alltabs = true; |
| 1752 | } |
| 1753 | |
| 1754 | for (int i = 0; i < tabs.length; i++) { |
| 1755 | if (!alltabs) { |
| 1756 | if (!(tabs[i] instanceof TabStopSpan)) |
| 1757 | continue; |
| 1758 | } |
| 1759 | |
| 1760 | int where = ((TabStopSpan) tabs[i]).getTabStop(); |
| 1761 | |
| 1762 | if (where < nh && where > h) |
| 1763 | nh = where; |
| 1764 | } |
| 1765 | |
| 1766 | if (nh != Float.MAX_VALUE) |
| 1767 | return nh; |
| 1768 | } |
| 1769 | |
| 1770 | return ((int) ((h + TAB_INCREMENT) / TAB_INCREMENT)) * TAB_INCREMENT; |
| 1771 | } |
| 1772 | |
| 1773 | protected final boolean isSpanned() { |
| 1774 | return mSpannedText; |
| 1775 | } |
| 1776 | |
| 1777 | private void ellipsize(int start, int end, int line, |
| 1778 | char[] dest, int destoff) { |
| 1779 | int ellipsisCount = getEllipsisCount(line); |
| 1780 | |
| 1781 | if (ellipsisCount == 0) { |
| 1782 | return; |
| 1783 | } |
| 1784 | |
| 1785 | int ellipsisStart = getEllipsisStart(line); |
| 1786 | int linestart = getLineStart(line); |
| 1787 | |
| 1788 | for (int i = ellipsisStart; i < ellipsisStart + ellipsisCount; i++) { |
| 1789 | char c; |
| 1790 | |
| 1791 | if (i == ellipsisStart) { |
| 1792 | c = '\u2026'; // ellipsis |
| 1793 | } else { |
| 1794 | c = '\uFEFF'; // 0-width space |
| 1795 | } |
| 1796 | |
| 1797 | int a = i + linestart; |
| 1798 | |
| 1799 | if (a >= start && a < end) { |
| 1800 | dest[destoff + a - start] = c; |
| 1801 | } |
| 1802 | } |
| 1803 | } |
| 1804 | |
| 1805 | /** |
| 1806 | * Stores information about bidirectional (left-to-right or right-to-left) |
| 1807 | * text within the layout of a line. TODO: This work is not complete |
| 1808 | * or correct and will be fleshed out in a later revision. |
| 1809 | */ |
| 1810 | public static class Directions { |
| 1811 | private short[] mDirections; |
| 1812 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame^] | 1813 | // The values in mDirections are the offsets from the first character |
| 1814 | // in the line to the next flip in direction. Runs at even indices |
| 1815 | // are left-to-right, the others are right-to-left. So, for example, |
| 1816 | // a line that starts with a right-to-left run has 0 at mDirections[0], |
| 1817 | // since the 'first' (ltr) run is zero length. |
| 1818 | // |
| 1819 | // The code currently assumes that each run is adjacent to the previous |
| 1820 | // one, progressing in the base line direction. This isn't sufficient |
| 1821 | // to handle nested runs, for example numeric text in an rtl context |
| 1822 | // in an ltr paragraph. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1823 | /* package */ Directions(short[] dirs) { |
| 1824 | mDirections = dirs; |
| 1825 | } |
| 1826 | } |
| 1827 | |
| 1828 | /** |
| 1829 | * Return the offset of the first character to be ellipsized away, |
| 1830 | * relative to the start of the line. (So 0 if the beginning of the |
| 1831 | * line is ellipsized, not getLineStart().) |
| 1832 | */ |
| 1833 | public abstract int getEllipsisStart(int line); |
| 1834 | /** |
| 1835 | * Returns the number of characters to be ellipsized away, or 0 if |
| 1836 | * no ellipsis is to take place. |
| 1837 | */ |
| 1838 | public abstract int getEllipsisCount(int line); |
| 1839 | |
| 1840 | /* package */ static class Ellipsizer implements CharSequence, GetChars { |
| 1841 | /* package */ CharSequence mText; |
| 1842 | /* package */ Layout mLayout; |
| 1843 | /* package */ int mWidth; |
| 1844 | /* package */ TextUtils.TruncateAt mMethod; |
| 1845 | |
| 1846 | public Ellipsizer(CharSequence s) { |
| 1847 | mText = s; |
| 1848 | } |
| 1849 | |
| 1850 | public char charAt(int off) { |
| 1851 | char[] buf = TextUtils.obtain(1); |
| 1852 | getChars(off, off + 1, buf, 0); |
| 1853 | char ret = buf[0]; |
| 1854 | |
| 1855 | TextUtils.recycle(buf); |
| 1856 | return ret; |
| 1857 | } |
| 1858 | |
| 1859 | public void getChars(int start, int end, char[] dest, int destoff) { |
| 1860 | int line1 = mLayout.getLineForOffset(start); |
| 1861 | int line2 = mLayout.getLineForOffset(end); |
| 1862 | |
| 1863 | TextUtils.getChars(mText, start, end, dest, destoff); |
| 1864 | |
| 1865 | for (int i = line1; i <= line2; i++) { |
| 1866 | mLayout.ellipsize(start, end, i, dest, destoff); |
| 1867 | } |
| 1868 | } |
| 1869 | |
| 1870 | public int length() { |
| 1871 | return mText.length(); |
| 1872 | } |
| 1873 | |
| 1874 | public CharSequence subSequence(int start, int end) { |
| 1875 | char[] s = new char[end - start]; |
| 1876 | getChars(start, end, s, 0); |
| 1877 | return new String(s); |
| 1878 | } |
| 1879 | |
| 1880 | public String toString() { |
| 1881 | char[] s = new char[length()]; |
| 1882 | getChars(0, length(), s, 0); |
| 1883 | return new String(s); |
| 1884 | } |
| 1885 | |
| 1886 | } |
| 1887 | |
| 1888 | /* package */ static class SpannedEllipsizer |
| 1889 | extends Ellipsizer implements Spanned { |
| 1890 | private Spanned mSpanned; |
| 1891 | |
| 1892 | public SpannedEllipsizer(CharSequence display) { |
| 1893 | super(display); |
| 1894 | mSpanned = (Spanned) display; |
| 1895 | } |
| 1896 | |
| 1897 | public <T> T[] getSpans(int start, int end, Class<T> type) { |
| 1898 | return mSpanned.getSpans(start, end, type); |
| 1899 | } |
| 1900 | |
| 1901 | public int getSpanStart(Object tag) { |
| 1902 | return mSpanned.getSpanStart(tag); |
| 1903 | } |
| 1904 | |
| 1905 | public int getSpanEnd(Object tag) { |
| 1906 | return mSpanned.getSpanEnd(tag); |
| 1907 | } |
| 1908 | |
| 1909 | public int getSpanFlags(Object tag) { |
| 1910 | return mSpanned.getSpanFlags(tag); |
| 1911 | } |
| 1912 | |
| 1913 | public int nextSpanTransition(int start, int limit, Class type) { |
| 1914 | return mSpanned.nextSpanTransition(start, limit, type); |
| 1915 | } |
| 1916 | |
| 1917 | public CharSequence subSequence(int start, int end) { |
| 1918 | char[] s = new char[end - start]; |
| 1919 | getChars(start, end, s, 0); |
| 1920 | |
| 1921 | SpannableString ss = new SpannableString(new String(s)); |
| 1922 | TextUtils.copySpansFrom(mSpanned, start, end, Object.class, ss, 0); |
| 1923 | return ss; |
| 1924 | } |
| 1925 | } |
| 1926 | |
| 1927 | private CharSequence mText; |
| 1928 | private TextPaint mPaint; |
| 1929 | /* package */ TextPaint mWorkPaint; |
| 1930 | private int mWidth; |
| 1931 | private Alignment mAlignment = Alignment.ALIGN_NORMAL; |
| 1932 | private float mSpacingMult; |
| 1933 | private float mSpacingAdd; |
| 1934 | private static Rect sTempRect = new Rect(); |
| 1935 | private boolean mSpannedText; |
| 1936 | |
| 1937 | public static final int DIR_LEFT_TO_RIGHT = 1; |
| 1938 | public static final int DIR_RIGHT_TO_LEFT = -1; |
| 1939 | |
| 1940 | public enum Alignment { |
| 1941 | ALIGN_NORMAL, |
| 1942 | ALIGN_OPPOSITE, |
| 1943 | ALIGN_CENTER, |
| 1944 | // XXX ALIGN_LEFT, |
| 1945 | // XXX ALIGN_RIGHT, |
| 1946 | } |
| 1947 | |
| 1948 | private static final int TAB_INCREMENT = 20; |
| 1949 | |
| 1950 | /* package */ static final Directions DIRS_ALL_LEFT_TO_RIGHT = |
| 1951 | new Directions(new short[] { 32767 }); |
| 1952 | /* package */ static final Directions DIRS_ALL_RIGHT_TO_LEFT = |
| 1953 | new Directions(new short[] { 0, 32767 }); |
| 1954 | |
| 1955 | } |
| 1956 | |