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 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 19 | import com.android.internal.util.ArrayUtils; |
| 20 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 21 | import android.emoji.EmojiFactory; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 22 | import android.graphics.Canvas; |
| 23 | import android.graphics.Paint; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 24 | import android.graphics.Path; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 25 | import android.graphics.Rect; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 26 | import android.text.method.TextKeyListener; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 27 | import android.text.style.AlignmentSpan; |
| 28 | import android.text.style.LeadingMarginSpan; |
| 29 | import android.text.style.LineBackgroundSpan; |
| 30 | import android.text.style.ParagraphStyle; |
| 31 | import android.text.style.ReplacementSpan; |
| 32 | import android.text.style.TabStopSpan; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 33 | import android.view.KeyEvent; |
| 34 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 35 | import junit.framework.Assert; |
| 36 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 37 | /** |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 38 | * A base class that manages text layout in visual elements on |
| 39 | * the screen. |
| 40 | * <p>For text that will be edited, use a {@link DynamicLayout}, |
| 41 | * which will be updated as the text changes. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 42 | * For text that will not change, use a {@link StaticLayout}. |
| 43 | */ |
| 44 | public abstract class Layout { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 45 | private static final boolean DEBUG = false; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 46 | private static final ParagraphStyle[] NO_PARA_SPANS = |
| 47 | ArrayUtils.emptyArray(ParagraphStyle.class); |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 48 | |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 49 | /* package */ static final EmojiFactory EMOJI_FACTORY = |
| 50 | EmojiFactory.newAvailableInstance(); |
| 51 | /* package */ static final int MIN_EMOJI, MAX_EMOJI; |
| 52 | |
| 53 | static { |
| 54 | if (EMOJI_FACTORY != null) { |
| 55 | MIN_EMOJI = EMOJI_FACTORY.getMinimumAndroidPua(); |
| 56 | MAX_EMOJI = EMOJI_FACTORY.getMaximumAndroidPua(); |
| 57 | } else { |
| 58 | MIN_EMOJI = -1; |
| 59 | MAX_EMOJI = -1; |
| 60 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 61 | } |
Eric Fischer | c2d54f4 | 2009-03-27 15:52:38 -0700 | [diff] [blame] | 62 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 63 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 64 | * 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] | 65 | * specified text with one line per paragraph. |
| 66 | */ |
| 67 | public static float getDesiredWidth(CharSequence source, |
| 68 | TextPaint paint) { |
| 69 | return getDesiredWidth(source, 0, source.length(), paint); |
| 70 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 71 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 72 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 73 | * 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] | 74 | * specified text slice with one line per paragraph. |
| 75 | */ |
| 76 | public static float getDesiredWidth(CharSequence source, |
| 77 | int start, int end, |
| 78 | TextPaint paint) { |
| 79 | float need = 0; |
| 80 | TextPaint workPaint = new TextPaint(); |
| 81 | |
| 82 | int next; |
| 83 | for (int i = start; i <= end; i = next) { |
| 84 | next = TextUtils.indexOf(source, '\n', i, end); |
| 85 | |
| 86 | if (next < 0) |
| 87 | next = end; |
| 88 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 89 | // note, omits trailing paragraph char |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 90 | float w = measurePara(paint, workPaint, |
| 91 | source, i, next, true, null); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 92 | |
| 93 | if (w > need) |
| 94 | need = w; |
| 95 | |
| 96 | next++; |
| 97 | } |
| 98 | |
| 99 | return need; |
| 100 | } |
| 101 | |
| 102 | /** |
| 103 | * Subclasses of Layout use this constructor to set the display text, |
| 104 | * width, and other standard properties. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 105 | * @param text the text to render |
| 106 | * @param paint the default paint for the layout. Styles can override |
| 107 | * various attributes of the paint. |
| 108 | * @param width the wrapping width for the text. |
| 109 | * @param align whether to left, right, or center the text. Styles can |
| 110 | * override the alignment. |
| 111 | * @param spacingMult factor by which to scale the font size to get the |
| 112 | * default line spacing |
| 113 | * @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] | 114 | */ |
| 115 | protected Layout(CharSequence text, TextPaint paint, |
| 116 | int width, Alignment align, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 117 | float spacingMult, float spacingAdd) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 118 | if (width < 0) |
| 119 | throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| 120 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 121 | // Ensure paint doesn't have baselineShift set. |
| 122 | // While normally we don't modify the paint the user passed in, |
| 123 | // we were already doing this in Styled.drawUniformRun with both |
| 124 | // baselineShift and bgColor. We probably should reevaluate bgColor. |
| 125 | if (paint != null) { |
| 126 | paint.bgColor = 0; |
| 127 | paint.baselineShift = 0; |
| 128 | } |
| 129 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 130 | mText = text; |
| 131 | mPaint = paint; |
| 132 | mWorkPaint = new TextPaint(); |
| 133 | mWidth = width; |
| 134 | mAlignment = align; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 135 | mSpacingMult = spacingMult; |
| 136 | mSpacingAdd = spacingAdd; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 137 | mSpannedText = text instanceof Spanned; |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Replace constructor properties of this Layout with new ones. Be careful. |
| 142 | */ |
| 143 | /* package */ void replaceWith(CharSequence text, TextPaint paint, |
| 144 | int width, Alignment align, |
| 145 | float spacingmult, float spacingadd) { |
| 146 | if (width < 0) { |
| 147 | throw new IllegalArgumentException("Layout: " + width + " < 0"); |
| 148 | } |
| 149 | |
| 150 | mText = text; |
| 151 | mPaint = paint; |
| 152 | mWidth = width; |
| 153 | mAlignment = align; |
| 154 | mSpacingMult = spacingmult; |
| 155 | mSpacingAdd = spacingadd; |
| 156 | mSpannedText = text instanceof Spanned; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Draw this Layout on the specified Canvas. |
| 161 | */ |
| 162 | public void draw(Canvas c) { |
| 163 | draw(c, null, null, 0); |
| 164 | } |
| 165 | |
| 166 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 167 | * Draw this Layout on the specified canvas, with the highlight path drawn |
| 168 | * between the background and the text. |
| 169 | * |
| 170 | * @param c the canvas |
| 171 | * @param highlight the path of the highlight or cursor; can be null |
| 172 | * @param highlightPaint the paint for the highlight |
| 173 | * @param cursorOffsetVertical the amount to temporarily translate the |
| 174 | * canvas while rendering the highlight |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 175 | */ |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 176 | public void draw(Canvas c, Path highlight, Paint highlightPaint, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 177 | int cursorOffsetVertical) { |
| 178 | int dtop, dbottom; |
| 179 | |
| 180 | synchronized (sTempRect) { |
| 181 | if (!c.getClipBounds(sTempRect)) { |
| 182 | return; |
| 183 | } |
| 184 | |
| 185 | dtop = sTempRect.top; |
| 186 | dbottom = sTempRect.bottom; |
| 187 | } |
| 188 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 189 | |
| 190 | int top = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 191 | int bottom = getLineTop(getLineCount()); |
| 192 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 193 | if (dtop > top) { |
| 194 | top = dtop; |
| 195 | } |
| 196 | if (dbottom < bottom) { |
| 197 | bottom = dbottom; |
| 198 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 199 | |
| 200 | int first = getLineForVertical(top); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 201 | int last = getLineForVertical(bottom); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 202 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 203 | int previousLineBottom = getLineTop(first); |
| 204 | int previousLineEnd = getLineStart(first); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 205 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 206 | TextPaint paint = mPaint; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 207 | CharSequence buf = mText; |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 208 | int width = mWidth; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 209 | boolean spannedText = mSpannedText; |
| 210 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 211 | ParagraphStyle[] spans = NO_PARA_SPANS; |
| 212 | int spanend = 0; |
| 213 | int textLength = 0; |
| 214 | |
| 215 | // First, draw LineBackgroundSpans. |
| 216 | // LineBackgroundSpans know nothing about the alignment or direction of |
| 217 | // the layout or line. XXX: Should they? |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 218 | if (spannedText) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 219 | textLength = buf.length(); |
| 220 | for (int i = first; i <= last; i++) { |
| 221 | int start = previousLineEnd; |
| 222 | int end = getLineStart(i+1); |
| 223 | previousLineEnd = end; |
| 224 | |
| 225 | int ltop = previousLineBottom; |
| 226 | int lbottom = getLineTop(i+1); |
| 227 | previousLineBottom = lbottom; |
| 228 | int lbaseline = lbottom - getLineDescent(i); |
| 229 | |
| 230 | if (start >= spanend) { |
| 231 | Spanned sp = (Spanned) buf; |
| 232 | spanend = sp.nextSpanTransition(start, textLength, |
| 233 | LineBackgroundSpan.class); |
| 234 | spans = sp.getSpans(start, spanend, |
| 235 | LineBackgroundSpan.class); |
| 236 | } |
| 237 | |
| 238 | for (int n = 0; n < spans.length; n++) { |
| 239 | LineBackgroundSpan back = (LineBackgroundSpan) spans[n]; |
| 240 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 241 | back.drawBackground(c, paint, 0, width, |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 242 | ltop, lbaseline, lbottom, |
| 243 | buf, start, end, |
| 244 | i); |
| 245 | } |
| 246 | } |
| 247 | // reset to their original values |
| 248 | spanend = 0; |
| 249 | previousLineBottom = getLineTop(first); |
| 250 | previousLineEnd = getLineStart(first); |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 251 | spans = NO_PARA_SPANS; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 252 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 253 | |
| 254 | // There can be a highlight even without spans if we are drawing |
| 255 | // a non-spanned transformation of a spanned editing buffer. |
| 256 | if (highlight != null) { |
| 257 | if (cursorOffsetVertical != 0) { |
| 258 | c.translate(0, cursorOffsetVertical); |
| 259 | } |
| 260 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 261 | c.drawPath(highlight, highlightPaint); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 262 | |
| 263 | if (cursorOffsetVertical != 0) { |
| 264 | c.translate(0, -cursorOffsetVertical); |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | Alignment align = mAlignment; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 269 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 270 | TextLine tl = TextLine.obtain(); |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 271 | // Next draw the lines, one at a time. |
| 272 | // the baseline is the top of the following line minus the current |
| 273 | // line's descent. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 274 | for (int i = first; i <= last; i++) { |
| 275 | int start = previousLineEnd; |
| 276 | |
| 277 | previousLineEnd = getLineStart(i+1); |
| 278 | int end = getLineVisibleEnd(i, start, previousLineEnd); |
| 279 | |
| 280 | int ltop = previousLineBottom; |
| 281 | int lbottom = getLineTop(i+1); |
| 282 | previousLineBottom = lbottom; |
| 283 | int lbaseline = lbottom - getLineDescent(i); |
| 284 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 285 | boolean isFirstParaLine = false; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 286 | if (spannedText) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 287 | if (start == 0 || buf.charAt(start - 1) == '\n') { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 288 | isFirstParaLine = true; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 289 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 290 | // New batch of paragraph styles, compute the alignment. |
| 291 | // Last alignment style wins. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 292 | if (start >= spanend) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 293 | Spanned sp = (Spanned) buf; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 294 | spanend = sp.nextSpanTransition(start, textLength, |
| 295 | ParagraphStyle.class); |
| 296 | spans = sp.getSpans(start, spanend, ParagraphStyle.class); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 297 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 298 | align = mAlignment; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 299 | for (int n = spans.length-1; n >= 0; n--) { |
| 300 | if (spans[n] instanceof AlignmentSpan) { |
| 301 | align = ((AlignmentSpan) spans[n]).getAlignment(); |
| 302 | break; |
| 303 | } |
| 304 | } |
| 305 | } |
| 306 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 307 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 308 | int dir = getParagraphDirection(i); |
| 309 | int left = 0; |
| 310 | int right = mWidth; |
| 311 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 312 | // Draw all leading margin spans. Adjust left or right according |
| 313 | // to the paragraph direction of the line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 314 | if (spannedText) { |
| 315 | final int length = spans.length; |
| 316 | for (int n = 0; n < length; n++) { |
| 317 | if (spans[n] instanceof LeadingMarginSpan) { |
| 318 | LeadingMarginSpan margin = (LeadingMarginSpan) spans[n]; |
| 319 | |
| 320 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 321 | margin.drawLeadingMargin(c, paint, right, dir, ltop, |
| 322 | lbaseline, lbottom, buf, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 323 | start, end, isFirstParaLine, this); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 324 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 325 | right -= margin.getLeadingMargin(isFirstParaLine); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 326 | } else { |
| 327 | margin.drawLeadingMargin(c, paint, left, dir, ltop, |
| 328 | lbaseline, lbottom, buf, |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 329 | start, end, isFirstParaLine, this); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 330 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 331 | boolean useMargin = isFirstParaLine; |
Mark Wagner | 7b5676e | 2009-10-16 11:44:23 -0700 | [diff] [blame] | 332 | if (margin instanceof LeadingMarginSpan.LeadingMarginSpan2) { |
| 333 | int count = ((LeadingMarginSpan.LeadingMarginSpan2)margin).getLeadingMarginLineCount(); |
| 334 | useMargin = count > i; |
| 335 | } |
| 336 | left += margin.getLeadingMargin(useMargin); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 337 | } |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 342 | // Adjust the point at which to start rendering depending on the |
| 343 | // alignment of the paragraph. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 344 | int x; |
| 345 | if (align == Alignment.ALIGN_NORMAL) { |
| 346 | if (dir == DIR_LEFT_TO_RIGHT) { |
| 347 | x = left; |
| 348 | } else { |
| 349 | x = right; |
| 350 | } |
| 351 | } else { |
| 352 | int max = (int)getLineMax(i, spans, false); |
| 353 | if (align == Alignment.ALIGN_OPPOSITE) { |
| 354 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 355 | x = left + max; |
| 356 | } else { |
| 357 | x = right - max; |
| 358 | } |
| 359 | } else { |
| 360 | // Alignment.ALIGN_CENTER |
| 361 | max = max & ~1; |
| 362 | int half = (right - left - max) >> 1; |
| 363 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 364 | x = right - half; |
| 365 | } else { |
| 366 | x = left + half; |
| 367 | } |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | Directions directions = getLineDirections(i); |
| 372 | boolean hasTab = getLineContainsTab(i); |
| 373 | if (directions == DIRS_ALL_LEFT_TO_RIGHT && |
| 374 | !spannedText && !hasTab) { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 375 | if (DEBUG) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 376 | Assert.assertTrue(dir == DIR_LEFT_TO_RIGHT); |
| 377 | Assert.assertNotNull(c); |
| 378 | } |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 379 | // XXX: assumes there's nothing additional to be done |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 380 | c.drawText(buf, start, end, x, lbaseline, paint); |
| 381 | } else { |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 382 | tl.set(paint, buf, start, end, dir, directions, hasTab, spans); |
| 383 | tl.draw(c, x, ltop, lbaseline, lbottom); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 384 | } |
| 385 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 386 | TextLine.recycle(tl); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 387 | } |
| 388 | |
| 389 | /** |
| 390 | * Return the text that is displayed by this Layout. |
| 391 | */ |
| 392 | public final CharSequence getText() { |
| 393 | return mText; |
| 394 | } |
| 395 | |
| 396 | /** |
| 397 | * Return the base Paint properties for this layout. |
| 398 | * Do NOT change the paint, which may result in funny |
| 399 | * drawing for this layout. |
| 400 | */ |
| 401 | public final TextPaint getPaint() { |
| 402 | return mPaint; |
| 403 | } |
| 404 | |
| 405 | /** |
| 406 | * Return the width of this layout. |
| 407 | */ |
| 408 | public final int getWidth() { |
| 409 | return mWidth; |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * Return the width to which this Layout is ellipsizing, or |
| 414 | * {@link #getWidth} if it is not doing anything special. |
| 415 | */ |
| 416 | public int getEllipsizedWidth() { |
| 417 | return mWidth; |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * Increase the width of this layout to the specified width. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 422 | * 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] | 423 | * it does not cause the text to reflow to use the full new width. |
| 424 | */ |
| 425 | public final void increaseWidthTo(int wid) { |
| 426 | if (wid < mWidth) { |
| 427 | throw new RuntimeException("attempted to reduce Layout width"); |
| 428 | } |
| 429 | |
| 430 | mWidth = wid; |
| 431 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 432 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 433 | /** |
| 434 | * Return the total height of this layout. |
| 435 | */ |
| 436 | public int getHeight() { |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 437 | return getLineTop(getLineCount()); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | /** |
| 441 | * Return the base alignment of this layout. |
| 442 | */ |
| 443 | public final Alignment getAlignment() { |
| 444 | return mAlignment; |
| 445 | } |
| 446 | |
| 447 | /** |
| 448 | * Return what the text height is multiplied by to get the line height. |
| 449 | */ |
| 450 | public final float getSpacingMultiplier() { |
| 451 | return mSpacingMult; |
| 452 | } |
| 453 | |
| 454 | /** |
| 455 | * Return the number of units of leading that are added to each line. |
| 456 | */ |
| 457 | public final float getSpacingAdd() { |
| 458 | return mSpacingAdd; |
| 459 | } |
| 460 | |
| 461 | /** |
| 462 | * Return the number of lines of text in this layout. |
| 463 | */ |
| 464 | public abstract int getLineCount(); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 465 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 466 | /** |
| 467 | * Return the baseline for the specified line (0…getLineCount() - 1) |
| 468 | * If bounds is not null, return the top, left, right, bottom extents |
| 469 | * of the specified line in it. |
| 470 | * @param line which line to examine (0..getLineCount() - 1) |
| 471 | * @param bounds Optional. If not null, it returns the extent of the line |
| 472 | * @return the Y-coordinate of the baseline |
| 473 | */ |
| 474 | public int getLineBounds(int line, Rect bounds) { |
| 475 | if (bounds != null) { |
| 476 | bounds.left = 0; // ??? |
| 477 | bounds.top = getLineTop(line); |
| 478 | bounds.right = mWidth; // ??? |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 479 | bounds.bottom = getLineTop(line + 1); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 480 | } |
| 481 | return getLineBaseline(line); |
| 482 | } |
| 483 | |
| 484 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 485 | * Return the vertical position of the top of the specified line |
| 486 | * (0…getLineCount()). |
| 487 | * 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] | 488 | * bottom of the last line. |
| 489 | */ |
| 490 | public abstract int getLineTop(int line); |
| 491 | |
| 492 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 493 | * 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] | 494 | */ |
| 495 | public abstract int getLineDescent(int line); |
| 496 | |
| 497 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 498 | * Return the text offset of the beginning of the specified line ( |
| 499 | * 0…getLineCount()). If the specified line is equal to the line |
| 500 | * count, returns the length of the text. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 501 | */ |
| 502 | public abstract int getLineStart(int line); |
| 503 | |
| 504 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 505 | * Returns the primary directionality of the paragraph containing the |
| 506 | * specified line, either 1 for left-to-right lines, or -1 for right-to-left |
| 507 | * 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] | 508 | */ |
| 509 | public abstract int getParagraphDirection(int line); |
| 510 | |
| 511 | /** |
The Android Open Source Project | 1059253 | 2009-03-18 17:39:46 -0700 | [diff] [blame] | 512 | * Returns whether the specified line contains one or more |
| 513 | * characters that need to be handled specially, like tabs |
| 514 | * or emoji. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 515 | */ |
| 516 | public abstract boolean getLineContainsTab(int line); |
| 517 | |
| 518 | /** |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 519 | * Returns the directional run information for the specified line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 520 | * The array alternates counts of characters in left-to-right |
| 521 | * and right-to-left segments of the line. |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 522 | * |
| 523 | * <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] | 524 | */ |
| 525 | public abstract Directions getLineDirections(int line); |
| 526 | |
| 527 | /** |
| 528 | * Returns the (negative) number of extra pixels of ascent padding in the |
| 529 | * top line of the Layout. |
| 530 | */ |
| 531 | public abstract int getTopPadding(); |
| 532 | |
| 533 | /** |
| 534 | * Returns the number of extra pixels of descent padding in the |
| 535 | * bottom line of the Layout. |
| 536 | */ |
| 537 | public abstract int getBottomPadding(); |
| 538 | |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 539 | |
| 540 | /** |
| 541 | * Returns true if the character at offset and the preceding character |
| 542 | * are at different run levels (and thus there's a split caret). |
| 543 | * @param offset the offset |
| 544 | * @return true if at a level boundary |
| 545 | */ |
| 546 | private boolean isLevelBoundary(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 547 | int line = getLineForOffset(offset); |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 548 | Directions dirs = getLineDirections(line); |
| 549 | if (dirs == DIRS_ALL_LEFT_TO_RIGHT || dirs == DIRS_ALL_RIGHT_TO_LEFT) { |
| 550 | return false; |
| 551 | } |
| 552 | |
| 553 | int[] runs = dirs.mDirections; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 554 | int lineStart = getLineStart(line); |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 555 | int lineEnd = getLineEnd(line); |
| 556 | if (offset == lineStart || offset == lineEnd) { |
| 557 | int paraLevel = getParagraphDirection(line) == 1 ? 0 : 1; |
| 558 | int runIndex = offset == lineStart ? 0 : runs.length - 2; |
| 559 | return ((runs[runIndex + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK) != paraLevel; |
| 560 | } |
| 561 | |
| 562 | offset -= lineStart; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 563 | for (int i = 0; i < runs.length; i += 2) { |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 564 | if (offset == runs[i]) { |
| 565 | return true; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 566 | } |
| 567 | } |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 568 | return false; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | private boolean primaryIsTrailingPrevious(int offset) { |
| 572 | int line = getLineForOffset(offset); |
| 573 | int lineStart = getLineStart(line); |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 574 | int lineEnd = getLineEnd(line); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 575 | int[] runs = getLineDirections(line).mDirections; |
| 576 | |
| 577 | int levelAt = -1; |
| 578 | for (int i = 0; i < runs.length; i += 2) { |
| 579 | int start = lineStart + runs[i]; |
| 580 | int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| 581 | if (limit > lineEnd) { |
| 582 | limit = lineEnd; |
| 583 | } |
| 584 | if (offset >= start && offset < limit) { |
| 585 | if (offset > start) { |
| 586 | // Previous character is at same level, so don't use trailing. |
| 587 | return false; |
| 588 | } |
| 589 | levelAt = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK; |
| 590 | break; |
| 591 | } |
| 592 | } |
| 593 | if (levelAt == -1) { |
| 594 | // Offset was limit of line. |
| 595 | levelAt = getParagraphDirection(line) == 1 ? 0 : 1; |
| 596 | } |
| 597 | |
| 598 | // At level boundary, check previous level. |
| 599 | int levelBefore = -1; |
| 600 | if (offset == lineStart) { |
| 601 | levelBefore = getParagraphDirection(line) == 1 ? 0 : 1; |
| 602 | } else { |
| 603 | offset -= 1; |
| 604 | for (int i = 0; i < runs.length; i += 2) { |
| 605 | int start = lineStart + runs[i]; |
| 606 | int limit = start + (runs[i+1] & RUN_LENGTH_MASK); |
| 607 | if (limit > lineEnd) { |
| 608 | limit = lineEnd; |
| 609 | } |
| 610 | if (offset >= start && offset < limit) { |
| 611 | levelBefore = (runs[i+1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK; |
| 612 | break; |
| 613 | } |
| 614 | } |
| 615 | } |
| 616 | |
| 617 | return levelBefore < levelAt; |
| 618 | } |
| 619 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 620 | /** |
| 621 | * Get the primary horizontal position for the specified text offset. |
| 622 | * This is the location where a new character would be inserted in |
| 623 | * the paragraph's primary direction. |
| 624 | */ |
| 625 | public float getPrimaryHorizontal(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 626 | boolean trailing = primaryIsTrailingPrevious(offset); |
| 627 | return getHorizontal(offset, trailing); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 628 | } |
| 629 | |
| 630 | /** |
| 631 | * Get the secondary horizontal position for the specified text offset. |
| 632 | * This is the location where a new character would be inserted in |
| 633 | * the direction other than the paragraph's primary direction. |
| 634 | */ |
| 635 | public float getSecondaryHorizontal(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 636 | boolean trailing = primaryIsTrailingPrevious(offset); |
| 637 | return getHorizontal(offset, !trailing); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 638 | } |
| 639 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 640 | private float getHorizontal(int offset, boolean trailing) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 641 | int line = getLineForOffset(offset); |
| 642 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 643 | return getHorizontal(offset, trailing, line); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 644 | } |
| 645 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 646 | private float getHorizontal(int offset, boolean trailing, int line) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 647 | int start = getLineStart(line); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 648 | int end = getLineEnd(line); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 649 | int dir = getParagraphDirection(line); |
| 650 | boolean tab = getLineContainsTab(line); |
| 651 | Directions directions = getLineDirections(line); |
| 652 | |
| 653 | TabStopSpan[] tabs = null; |
| 654 | if (tab && mText instanceof Spanned) { |
| 655 | tabs = ((Spanned) mText).getSpans(start, end, TabStopSpan.class); |
| 656 | } |
| 657 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 658 | TextLine tl = TextLine.obtain(); |
| 659 | tl.set(mPaint, mText, start, end, dir, directions, tab, tabs); |
| 660 | float wid = tl.measure(offset - start, trailing, null); |
| 661 | TextLine.recycle(tl); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 662 | |
| 663 | Alignment align = getParagraphAlignment(line); |
| 664 | int left = getParagraphLeft(line); |
| 665 | int right = getParagraphRight(line); |
| 666 | |
| 667 | if (align == Alignment.ALIGN_NORMAL) { |
| 668 | if (dir == DIR_RIGHT_TO_LEFT) |
| 669 | return right + wid; |
| 670 | else |
| 671 | return left + wid; |
| 672 | } |
| 673 | |
| 674 | float max = getLineMax(line); |
| 675 | |
| 676 | if (align == Alignment.ALIGN_OPPOSITE) { |
| 677 | if (dir == DIR_RIGHT_TO_LEFT) |
| 678 | return left + max + wid; |
| 679 | else |
| 680 | return right - max + wid; |
| 681 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 682 | int imax = ((int) max) & ~1; |
| 683 | |
| 684 | if (dir == DIR_RIGHT_TO_LEFT) |
| 685 | return right - (((right - left) - imax) / 2) + wid; |
| 686 | else |
| 687 | return left + ((right - left) - imax) / 2 + wid; |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | /** |
| 692 | * Get the leftmost position that should be exposed for horizontal |
| 693 | * scrolling on the specified line. |
| 694 | */ |
| 695 | public float getLineLeft(int line) { |
| 696 | int dir = getParagraphDirection(line); |
| 697 | Alignment align = getParagraphAlignment(line); |
| 698 | |
| 699 | if (align == Alignment.ALIGN_NORMAL) { |
| 700 | if (dir == DIR_RIGHT_TO_LEFT) |
| 701 | return getParagraphRight(line) - getLineMax(line); |
| 702 | else |
| 703 | return 0; |
| 704 | } else if (align == Alignment.ALIGN_OPPOSITE) { |
| 705 | if (dir == DIR_RIGHT_TO_LEFT) |
| 706 | return 0; |
| 707 | else |
| 708 | return mWidth - getLineMax(line); |
| 709 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 710 | int left = getParagraphLeft(line); |
| 711 | int right = getParagraphRight(line); |
| 712 | int max = ((int) getLineMax(line)) & ~1; |
| 713 | |
| 714 | return left + ((right - left) - max) / 2; |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | /** |
| 719 | * Get the rightmost position that should be exposed for horizontal |
| 720 | * scrolling on the specified line. |
| 721 | */ |
| 722 | public float getLineRight(int line) { |
| 723 | int dir = getParagraphDirection(line); |
| 724 | Alignment align = getParagraphAlignment(line); |
| 725 | |
| 726 | if (align == Alignment.ALIGN_NORMAL) { |
| 727 | if (dir == DIR_RIGHT_TO_LEFT) |
| 728 | return mWidth; |
| 729 | else |
| 730 | return getParagraphLeft(line) + getLineMax(line); |
| 731 | } else if (align == Alignment.ALIGN_OPPOSITE) { |
| 732 | if (dir == DIR_RIGHT_TO_LEFT) |
| 733 | return getLineMax(line); |
| 734 | else |
| 735 | return mWidth; |
| 736 | } else { /* align == Alignment.ALIGN_CENTER */ |
| 737 | int left = getParagraphLeft(line); |
| 738 | int right = getParagraphRight(line); |
| 739 | int max = ((int) getLineMax(line)) & ~1; |
| 740 | |
| 741 | return right - ((right - left) - max) / 2; |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * Gets the horizontal extent of the specified line, excluding |
| 747 | * trailing whitespace. |
| 748 | */ |
| 749 | public float getLineMax(int line) { |
| 750 | return getLineMax(line, null, false); |
| 751 | } |
| 752 | |
| 753 | /** |
| 754 | * Gets the horizontal extent of the specified line, including |
| 755 | * trailing whitespace. |
| 756 | */ |
| 757 | public float getLineWidth(int line) { |
| 758 | return getLineMax(line, null, true); |
| 759 | } |
| 760 | |
| 761 | private float getLineMax(int line, Object[] tabs, boolean full) { |
| 762 | int start = getLineStart(line); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 763 | int end = full ? getLineEnd(line) : getLineVisibleEnd(line); |
| 764 | boolean hasTabs = getLineContainsTab(line); |
| 765 | Directions directions = getLineDirections(line); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 766 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 767 | TextLine tl = TextLine.obtain(); |
| 768 | tl.set(mPaint, mText, start, end, 1, directions, hasTabs, tabs); |
| 769 | float width = tl.metrics(null); |
| 770 | TextLine.recycle(tl); |
| 771 | return width; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 772 | } |
| 773 | |
| 774 | /** |
| 775 | * Get the line number corresponding to the specified vertical position. |
| 776 | * If you ask for a position above 0, you get 0; if you ask for a position |
| 777 | * below the bottom of the text, you get the last line. |
| 778 | */ |
| 779 | // FIXME: It may be faster to do a linear search for layouts without many lines. |
| 780 | public int getLineForVertical(int vertical) { |
| 781 | int high = getLineCount(), low = -1, guess; |
| 782 | |
| 783 | while (high - low > 1) { |
| 784 | guess = (high + low) / 2; |
| 785 | |
| 786 | if (getLineTop(guess) > vertical) |
| 787 | high = guess; |
| 788 | else |
| 789 | low = guess; |
| 790 | } |
| 791 | |
| 792 | if (low < 0) |
| 793 | return 0; |
| 794 | else |
| 795 | return low; |
| 796 | } |
| 797 | |
| 798 | /** |
| 799 | * Get the line number on which the specified text offset appears. |
| 800 | * If you ask for a position before 0, you get 0; if you ask for a position |
| 801 | * beyond the end of the text, you get the last line. |
| 802 | */ |
| 803 | public int getLineForOffset(int offset) { |
| 804 | int high = getLineCount(), low = -1, guess; |
| 805 | |
| 806 | while (high - low > 1) { |
| 807 | guess = (high + low) / 2; |
| 808 | |
| 809 | if (getLineStart(guess) > offset) |
| 810 | high = guess; |
| 811 | else |
| 812 | low = guess; |
| 813 | } |
| 814 | |
| 815 | if (low < 0) |
| 816 | return 0; |
| 817 | else |
| 818 | return low; |
| 819 | } |
| 820 | |
| 821 | /** |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 822 | * Get the character offset on the specified line whose position is |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 823 | * closest to the specified horizontal position. |
| 824 | */ |
| 825 | public int getOffsetForHorizontal(int line, float horiz) { |
| 826 | int max = getLineEnd(line) - 1; |
| 827 | int min = getLineStart(line); |
| 828 | Directions dirs = getLineDirections(line); |
| 829 | |
| 830 | if (line == getLineCount() - 1) |
| 831 | max++; |
| 832 | |
| 833 | int best = min; |
| 834 | float bestdist = Math.abs(getPrimaryHorizontal(best) - horiz); |
| 835 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 836 | for (int i = 0; i < dirs.mDirections.length; i += 2) { |
| 837 | int here = min + dirs.mDirections[i]; |
| 838 | int there = here + (dirs.mDirections[i+1] & RUN_LENGTH_MASK); |
| 839 | int swap = (dirs.mDirections[i+1] & RUN_RTL_FLAG) != 0 ? -1 : 1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 840 | |
| 841 | if (there > max) |
| 842 | there = max; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 843 | int high = there - 1 + 1, low = here + 1 - 1, guess; |
| 844 | |
| 845 | while (high - low > 1) { |
| 846 | guess = (high + low) / 2; |
| 847 | int adguess = getOffsetAtStartOf(guess); |
| 848 | |
| 849 | if (getPrimaryHorizontal(adguess) * swap >= horiz * swap) |
| 850 | high = guess; |
| 851 | else |
| 852 | low = guess; |
| 853 | } |
| 854 | |
| 855 | if (low < here + 1) |
| 856 | low = here + 1; |
| 857 | |
| 858 | if (low < there) { |
| 859 | low = getOffsetAtStartOf(low); |
| 860 | |
| 861 | float dist = Math.abs(getPrimaryHorizontal(low) - horiz); |
| 862 | |
| 863 | int aft = TextUtils.getOffsetAfter(mText, low); |
| 864 | if (aft < there) { |
| 865 | float other = Math.abs(getPrimaryHorizontal(aft) - horiz); |
| 866 | |
| 867 | if (other < dist) { |
| 868 | dist = other; |
| 869 | low = aft; |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | if (dist < bestdist) { |
| 874 | bestdist = dist; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 875 | best = low; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 876 | } |
| 877 | } |
| 878 | |
| 879 | float dist = Math.abs(getPrimaryHorizontal(here) - horiz); |
| 880 | |
| 881 | if (dist < bestdist) { |
| 882 | bestdist = dist; |
| 883 | best = here; |
| 884 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 885 | } |
| 886 | |
| 887 | float dist = Math.abs(getPrimaryHorizontal(max) - horiz); |
| 888 | |
| 889 | if (dist < bestdist) { |
| 890 | bestdist = dist; |
| 891 | best = max; |
| 892 | } |
| 893 | |
| 894 | return best; |
| 895 | } |
| 896 | |
| 897 | /** |
| 898 | * Return the text offset after the last character on the specified line. |
| 899 | */ |
| 900 | public final int getLineEnd(int line) { |
| 901 | return getLineStart(line + 1); |
| 902 | } |
| 903 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 904 | /** |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 905 | * Return the text offset after the last visible character (so whitespace |
| 906 | * is not counted) on the specified line. |
| 907 | */ |
| 908 | public int getLineVisibleEnd(int line) { |
| 909 | return getLineVisibleEnd(line, getLineStart(line), getLineStart(line+1)); |
| 910 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 911 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 912 | private int getLineVisibleEnd(int line, int start, int end) { |
Dave Bort | 76c0226 | 2009-04-13 17:17:21 -0700 | [diff] [blame] | 913 | if (DEBUG) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 914 | Assert.assertTrue(getLineStart(line) == start && getLineStart(line+1) == end); |
| 915 | } |
| 916 | |
| 917 | CharSequence text = mText; |
| 918 | char ch; |
| 919 | if (line == getLineCount() - 1) { |
| 920 | return end; |
| 921 | } |
| 922 | |
| 923 | for (; end > start; end--) { |
| 924 | ch = text.charAt(end - 1); |
| 925 | |
| 926 | if (ch == '\n') { |
| 927 | return end - 1; |
| 928 | } |
| 929 | |
| 930 | if (ch != ' ' && ch != '\t') { |
| 931 | break; |
| 932 | } |
| 933 | |
| 934 | } |
| 935 | |
| 936 | return end; |
| 937 | } |
| 938 | |
| 939 | /** |
| 940 | * Return the vertical position of the bottom of the specified line. |
| 941 | */ |
| 942 | public final int getLineBottom(int line) { |
| 943 | return getLineTop(line + 1); |
| 944 | } |
| 945 | |
| 946 | /** |
| 947 | * Return the vertical position of the baseline of the specified line. |
| 948 | */ |
| 949 | public final int getLineBaseline(int line) { |
| 950 | // getLineTop(line+1) == getLineTop(line) |
| 951 | return getLineTop(line+1) - getLineDescent(line); |
| 952 | } |
| 953 | |
| 954 | /** |
| 955 | * Get the ascent of the text on the specified line. |
| 956 | * The return value is negative to match the Paint.ascent() convention. |
| 957 | */ |
| 958 | public final int getLineAscent(int line) { |
| 959 | // getLineTop(line+1) - getLineDescent(line) == getLineBaseLine(line) |
| 960 | return getLineTop(line) - (getLineTop(line+1) - getLineDescent(line)); |
| 961 | } |
| 962 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 963 | public int getOffsetToLeftOf(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 964 | return getOffsetToLeftRightOf(offset, true); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 965 | } |
| 966 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 967 | public int getOffsetToRightOf(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 968 | return getOffsetToLeftRightOf(offset, false); |
| 969 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 970 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 971 | private int getOffsetToLeftRightOf(int caret, boolean toLeft) { |
| 972 | int line = getLineForOffset(caret); |
| 973 | int lineStart = getLineStart(line); |
| 974 | int lineEnd = getLineEnd(line); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 975 | int lineDir = getParagraphDirection(line); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 976 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 977 | boolean advance = toLeft == (lineDir == DIR_RIGHT_TO_LEFT); |
| 978 | if (caret == (advance ? lineEnd : lineStart)) { |
| 979 | // walking off line, so look at the line we're headed to |
| 980 | if (caret == lineStart) { |
| 981 | if (line > 0) { |
| 982 | --line; |
| 983 | } else { |
| 984 | return caret; // at very start, don't move |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 985 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 986 | } else { |
| 987 | if (line < getLineCount() - 1) { |
| 988 | ++line; |
| 989 | } else { |
| 990 | return caret; // at very end, don't move |
| 991 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 992 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 993 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 994 | lineStart = getLineStart(line); |
| 995 | lineEnd = getLineEnd(line); |
| 996 | int newDir = getParagraphDirection(line); |
| 997 | if (newDir != lineDir) { |
| 998 | // unusual case. we want to walk onto the line, but it runs |
| 999 | // in a different direction than this one, so we fake movement |
| 1000 | // in the opposite direction. |
| 1001 | toLeft = !toLeft; |
| 1002 | lineDir = newDir; |
| 1003 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1004 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1005 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 1006 | Directions directions = getLineDirections(line); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1007 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 1008 | TextLine tl = TextLine.obtain(); |
| 1009 | // XXX: we don't care about tabs |
| 1010 | tl.set(mPaint, mText, lineStart, lineEnd, lineDir, directions, false, null); |
| 1011 | caret = lineStart + tl.getOffsetToLeftRightOf(caret - lineStart, toLeft); |
| 1012 | tl = TextLine.recycle(tl); |
| 1013 | return caret; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1014 | } |
| 1015 | |
| 1016 | private int getOffsetAtStartOf(int offset) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1017 | // XXX this probably should skip local reorderings and |
| 1018 | // zero-width characters, look at callers |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1019 | if (offset == 0) |
| 1020 | return 0; |
| 1021 | |
| 1022 | CharSequence text = mText; |
| 1023 | char c = text.charAt(offset); |
| 1024 | |
| 1025 | if (c >= '\uDC00' && c <= '\uDFFF') { |
| 1026 | char c1 = text.charAt(offset - 1); |
| 1027 | |
| 1028 | if (c1 >= '\uD800' && c1 <= '\uDBFF') |
| 1029 | offset -= 1; |
| 1030 | } |
| 1031 | |
| 1032 | if (mSpannedText) { |
| 1033 | ReplacementSpan[] spans = ((Spanned) text).getSpans(offset, offset, |
| 1034 | ReplacementSpan.class); |
| 1035 | |
| 1036 | for (int i = 0; i < spans.length; i++) { |
| 1037 | int start = ((Spanned) text).getSpanStart(spans[i]); |
| 1038 | int end = ((Spanned) text).getSpanEnd(spans[i]); |
| 1039 | |
| 1040 | if (start < offset && end > offset) |
| 1041 | offset = start; |
| 1042 | } |
| 1043 | } |
| 1044 | |
| 1045 | return offset; |
| 1046 | } |
| 1047 | |
| 1048 | /** |
| 1049 | * Fills in the specified Path with a representation of a cursor |
| 1050 | * at the specified offset. This will often be a vertical line |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 1051 | * but can be multiple discontinuous lines in text with multiple |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1052 | * directionalities. |
| 1053 | */ |
| 1054 | public void getCursorPath(int point, Path dest, |
| 1055 | CharSequence editingBuffer) { |
| 1056 | dest.reset(); |
| 1057 | |
| 1058 | int line = getLineForOffset(point); |
| 1059 | int top = getLineTop(line); |
| 1060 | int bottom = getLineTop(line+1); |
| 1061 | |
| 1062 | float h1 = getPrimaryHorizontal(point) - 0.5f; |
Doug Felt | 4e0c5e5 | 2010-03-15 16:56:02 -0700 | [diff] [blame] | 1063 | float h2 = isLevelBoundary(point) ? |
| 1064 | getSecondaryHorizontal(point) - 0.5f : h1; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1065 | |
| 1066 | int caps = TextKeyListener.getMetaState(editingBuffer, |
| 1067 | KeyEvent.META_SHIFT_ON) | |
| 1068 | TextKeyListener.getMetaState(editingBuffer, |
| 1069 | TextKeyListener.META_SELECTING); |
| 1070 | int fn = TextKeyListener.getMetaState(editingBuffer, |
| 1071 | KeyEvent.META_ALT_ON); |
| 1072 | int dist = 0; |
| 1073 | |
| 1074 | if (caps != 0 || fn != 0) { |
| 1075 | dist = (bottom - top) >> 2; |
| 1076 | |
| 1077 | if (fn != 0) |
| 1078 | top += dist; |
| 1079 | if (caps != 0) |
| 1080 | bottom -= dist; |
| 1081 | } |
| 1082 | |
| 1083 | if (h1 < 0.5f) |
| 1084 | h1 = 0.5f; |
| 1085 | if (h2 < 0.5f) |
| 1086 | h2 = 0.5f; |
| 1087 | |
| 1088 | if (h1 == h2) { |
| 1089 | dest.moveTo(h1, top); |
| 1090 | dest.lineTo(h1, bottom); |
| 1091 | } else { |
| 1092 | dest.moveTo(h1, top); |
| 1093 | dest.lineTo(h1, (top + bottom) >> 1); |
| 1094 | |
| 1095 | dest.moveTo(h2, (top + bottom) >> 1); |
| 1096 | dest.lineTo(h2, bottom); |
| 1097 | } |
| 1098 | |
| 1099 | if (caps == 2) { |
| 1100 | dest.moveTo(h2, bottom); |
| 1101 | dest.lineTo(h2 - dist, bottom + dist); |
| 1102 | dest.lineTo(h2, bottom); |
| 1103 | dest.lineTo(h2 + dist, bottom + dist); |
| 1104 | } else if (caps == 1) { |
| 1105 | dest.moveTo(h2, bottom); |
| 1106 | dest.lineTo(h2 - dist, bottom + dist); |
| 1107 | |
| 1108 | dest.moveTo(h2 - dist, bottom + dist - 0.5f); |
| 1109 | dest.lineTo(h2 + dist, bottom + dist - 0.5f); |
| 1110 | |
| 1111 | dest.moveTo(h2 + dist, bottom + dist); |
| 1112 | dest.lineTo(h2, bottom); |
| 1113 | } |
| 1114 | |
| 1115 | if (fn == 2) { |
| 1116 | dest.moveTo(h1, top); |
| 1117 | dest.lineTo(h1 - dist, top - dist); |
| 1118 | dest.lineTo(h1, top); |
| 1119 | dest.lineTo(h1 + dist, top - dist); |
| 1120 | } else if (fn == 1) { |
| 1121 | dest.moveTo(h1, top); |
| 1122 | dest.lineTo(h1 - dist, top - dist); |
| 1123 | |
| 1124 | dest.moveTo(h1 - dist, top - dist + 0.5f); |
| 1125 | dest.lineTo(h1 + dist, top - dist + 0.5f); |
| 1126 | |
| 1127 | dest.moveTo(h1 + dist, top - dist); |
| 1128 | dest.lineTo(h1, top); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | private void addSelection(int line, int start, int end, |
| 1133 | int top, int bottom, Path dest) { |
| 1134 | int linestart = getLineStart(line); |
| 1135 | int lineend = getLineEnd(line); |
| 1136 | Directions dirs = getLineDirections(line); |
| 1137 | |
| 1138 | if (lineend > linestart && mText.charAt(lineend - 1) == '\n') |
| 1139 | lineend--; |
| 1140 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1141 | for (int i = 0; i < dirs.mDirections.length; i += 2) { |
| 1142 | int here = linestart + dirs.mDirections[i]; |
| 1143 | int there = here + (dirs.mDirections[i+1] & RUN_LENGTH_MASK); |
| 1144 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1145 | if (there > lineend) |
| 1146 | there = lineend; |
| 1147 | |
| 1148 | if (start <= there && end >= here) { |
| 1149 | int st = Math.max(start, here); |
| 1150 | int en = Math.min(end, there); |
| 1151 | |
| 1152 | if (st != en) { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1153 | float h1 = getHorizontal(st, false, line); |
| 1154 | float h2 = getHorizontal(en, true, line); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1155 | |
| 1156 | dest.addRect(h1, top, h2, bottom, Path.Direction.CW); |
| 1157 | } |
| 1158 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1159 | } |
| 1160 | } |
| 1161 | |
| 1162 | /** |
| 1163 | * Fills in the specified Path with a representation of a highlight |
| 1164 | * between the specified offsets. This will often be a rectangle |
| 1165 | * or a potentially discontinuous set of rectangles. If the start |
| 1166 | * and end are the same, the returned path is empty. |
| 1167 | */ |
| 1168 | public void getSelectionPath(int start, int end, Path dest) { |
| 1169 | dest.reset(); |
| 1170 | |
| 1171 | if (start == end) |
| 1172 | return; |
| 1173 | |
| 1174 | if (end < start) { |
| 1175 | int temp = end; |
| 1176 | end = start; |
| 1177 | start = temp; |
| 1178 | } |
| 1179 | |
| 1180 | int startline = getLineForOffset(start); |
| 1181 | int endline = getLineForOffset(end); |
| 1182 | |
| 1183 | int top = getLineTop(startline); |
| 1184 | int bottom = getLineBottom(endline); |
| 1185 | |
| 1186 | if (startline == endline) { |
| 1187 | addSelection(startline, start, end, top, bottom, dest); |
| 1188 | } else { |
| 1189 | final float width = mWidth; |
| 1190 | |
| 1191 | addSelection(startline, start, getLineEnd(startline), |
| 1192 | top, getLineBottom(startline), dest); |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1193 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1194 | if (getParagraphDirection(startline) == DIR_RIGHT_TO_LEFT) |
| 1195 | dest.addRect(getLineLeft(startline), top, |
| 1196 | 0, getLineBottom(startline), Path.Direction.CW); |
| 1197 | else |
| 1198 | dest.addRect(getLineRight(startline), top, |
| 1199 | width, getLineBottom(startline), Path.Direction.CW); |
| 1200 | |
| 1201 | for (int i = startline + 1; i < endline; i++) { |
| 1202 | top = getLineTop(i); |
| 1203 | bottom = getLineBottom(i); |
| 1204 | dest.addRect(0, top, width, bottom, Path.Direction.CW); |
| 1205 | } |
| 1206 | |
| 1207 | top = getLineTop(endline); |
| 1208 | bottom = getLineBottom(endline); |
| 1209 | |
| 1210 | addSelection(endline, getLineStart(endline), end, |
| 1211 | top, bottom, dest); |
| 1212 | |
| 1213 | if (getParagraphDirection(endline) == DIR_RIGHT_TO_LEFT) |
| 1214 | dest.addRect(width, top, getLineRight(endline), bottom, Path.Direction.CW); |
| 1215 | else |
| 1216 | dest.addRect(0, top, getLineLeft(endline), bottom, Path.Direction.CW); |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | /** |
| 1221 | * Get the alignment of the specified paragraph, taking into account |
| 1222 | * markup attached to it. |
| 1223 | */ |
| 1224 | public final Alignment getParagraphAlignment(int line) { |
| 1225 | Alignment align = mAlignment; |
| 1226 | |
| 1227 | if (mSpannedText) { |
| 1228 | Spanned sp = (Spanned) mText; |
| 1229 | AlignmentSpan[] spans = sp.getSpans(getLineStart(line), |
| 1230 | getLineEnd(line), |
| 1231 | AlignmentSpan.class); |
| 1232 | |
| 1233 | int spanLength = spans.length; |
| 1234 | if (spanLength > 0) { |
| 1235 | align = spans[spanLength-1].getAlignment(); |
| 1236 | } |
| 1237 | } |
| 1238 | |
| 1239 | return align; |
| 1240 | } |
| 1241 | |
| 1242 | /** |
| 1243 | * Get the left edge of the specified paragraph, inset by left margins. |
| 1244 | */ |
| 1245 | public final int getParagraphLeft(int line) { |
| 1246 | int dir = getParagraphDirection(line); |
| 1247 | |
| 1248 | int left = 0; |
| 1249 | |
| 1250 | boolean par = false; |
| 1251 | int off = getLineStart(line); |
| 1252 | if (off == 0 || mText.charAt(off - 1) == '\n') |
| 1253 | par = true; |
| 1254 | |
| 1255 | if (dir == DIR_LEFT_TO_RIGHT) { |
| 1256 | if (mSpannedText) { |
| 1257 | Spanned sp = (Spanned) mText; |
| 1258 | LeadingMarginSpan[] spans = sp.getSpans(getLineStart(line), |
| 1259 | getLineEnd(line), |
| 1260 | LeadingMarginSpan.class); |
| 1261 | |
| 1262 | for (int i = 0; i < spans.length; i++) { |
Mark Wagner | 7b5676e | 2009-10-16 11:44:23 -0700 | [diff] [blame] | 1263 | boolean margin = par; |
| 1264 | LeadingMarginSpan span = spans[i]; |
| 1265 | if (span instanceof LeadingMarginSpan.LeadingMarginSpan2) { |
| 1266 | int count = ((LeadingMarginSpan.LeadingMarginSpan2)span).getLeadingMarginLineCount(); |
| 1267 | margin = count >= line; |
| 1268 | } |
| 1269 | left += span.getLeadingMargin(margin); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1270 | } |
| 1271 | } |
| 1272 | } |
| 1273 | |
| 1274 | return left; |
| 1275 | } |
| 1276 | |
| 1277 | /** |
| 1278 | * Get the right edge of the specified paragraph, inset by right margins. |
| 1279 | */ |
| 1280 | public final int getParagraphRight(int line) { |
| 1281 | int dir = getParagraphDirection(line); |
| 1282 | |
| 1283 | int right = mWidth; |
| 1284 | |
| 1285 | boolean par = false; |
| 1286 | int off = getLineStart(line); |
| 1287 | if (off == 0 || mText.charAt(off - 1) == '\n') |
| 1288 | par = true; |
| 1289 | |
| 1290 | |
| 1291 | if (dir == DIR_RIGHT_TO_LEFT) { |
| 1292 | if (mSpannedText) { |
| 1293 | Spanned sp = (Spanned) mText; |
| 1294 | LeadingMarginSpan[] spans = sp.getSpans(getLineStart(line), |
| 1295 | getLineEnd(line), |
| 1296 | LeadingMarginSpan.class); |
| 1297 | |
| 1298 | for (int i = 0; i < spans.length; i++) { |
| 1299 | right -= spans[i].getLeadingMargin(par); |
| 1300 | } |
| 1301 | } |
| 1302 | } |
| 1303 | |
| 1304 | return right; |
| 1305 | } |
| 1306 | |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 1307 | /* package */ |
| 1308 | static float measurePara(TextPaint paint, TextPaint workPaint, |
| 1309 | CharSequence text, int start, int end, boolean hasTabs, |
| 1310 | Object[] tabs) { |
| 1311 | |
| 1312 | MeasuredText mt = MeasuredText.obtain(); |
| 1313 | TextLine tl = TextLine.obtain(); |
| 1314 | try { |
| 1315 | mt.setPara(text, start, end, DIR_REQUEST_LTR); |
| 1316 | Directions directions; |
| 1317 | if (mt.mEasy){ |
| 1318 | directions = DIRS_ALL_LEFT_TO_RIGHT; |
| 1319 | } else { |
| 1320 | directions = AndroidBidi.directions(mt.mDir, mt.mLevels, |
| 1321 | 0, mt.mChars, 0, mt.mLen); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1322 | } |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 1323 | tl.set(paint, text, start, end, 1, directions, hasTabs, tabs); |
| 1324 | return tl.metrics(null); |
| 1325 | } finally { |
| 1326 | TextLine.recycle(tl); |
| 1327 | MeasuredText.recycle(mt); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1328 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1329 | } |
| 1330 | |
Doug Felt | 71b8dd7 | 2010-02-16 17:27:09 -0800 | [diff] [blame] | 1331 | /** |
| 1332 | * Returns the position of the next tab stop after h on the line. |
| 1333 | * |
| 1334 | * @param text the text |
| 1335 | * @param start start of the line |
| 1336 | * @param end limit of the line |
| 1337 | * @param h the current horizontal offset |
| 1338 | * @param tabs the tabs, can be null. If it is null, any tabs in effect |
| 1339 | * on the line will be used. If there are no tabs, a default offset |
| 1340 | * will be used to compute the tab stop. |
| 1341 | * @return the offset of the next tab stop. |
| 1342 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1343 | /* package */ static float nextTab(CharSequence text, int start, int end, |
| 1344 | float h, Object[] tabs) { |
| 1345 | float nh = Float.MAX_VALUE; |
| 1346 | boolean alltabs = false; |
| 1347 | |
| 1348 | if (text instanceof Spanned) { |
| 1349 | if (tabs == null) { |
| 1350 | tabs = ((Spanned) text).getSpans(start, end, TabStopSpan.class); |
| 1351 | alltabs = true; |
| 1352 | } |
| 1353 | |
| 1354 | for (int i = 0; i < tabs.length; i++) { |
| 1355 | if (!alltabs) { |
| 1356 | if (!(tabs[i] instanceof TabStopSpan)) |
| 1357 | continue; |
| 1358 | } |
| 1359 | |
| 1360 | int where = ((TabStopSpan) tabs[i]).getTabStop(); |
| 1361 | |
| 1362 | if (where < nh && where > h) |
| 1363 | nh = where; |
| 1364 | } |
| 1365 | |
| 1366 | if (nh != Float.MAX_VALUE) |
| 1367 | return nh; |
| 1368 | } |
| 1369 | |
| 1370 | return ((int) ((h + TAB_INCREMENT) / TAB_INCREMENT)) * TAB_INCREMENT; |
| 1371 | } |
| 1372 | |
| 1373 | protected final boolean isSpanned() { |
| 1374 | return mSpannedText; |
| 1375 | } |
| 1376 | |
| 1377 | private void ellipsize(int start, int end, int line, |
| 1378 | char[] dest, int destoff) { |
| 1379 | int ellipsisCount = getEllipsisCount(line); |
| 1380 | |
| 1381 | if (ellipsisCount == 0) { |
| 1382 | return; |
| 1383 | } |
| 1384 | |
| 1385 | int ellipsisStart = getEllipsisStart(line); |
| 1386 | int linestart = getLineStart(line); |
| 1387 | |
| 1388 | for (int i = ellipsisStart; i < ellipsisStart + ellipsisCount; i++) { |
| 1389 | char c; |
| 1390 | |
| 1391 | if (i == ellipsisStart) { |
| 1392 | c = '\u2026'; // ellipsis |
| 1393 | } else { |
| 1394 | c = '\uFEFF'; // 0-width space |
| 1395 | } |
| 1396 | |
| 1397 | int a = i + linestart; |
| 1398 | |
| 1399 | if (a >= start && a < end) { |
| 1400 | dest[destoff + a - start] = c; |
| 1401 | } |
| 1402 | } |
| 1403 | } |
| 1404 | |
| 1405 | /** |
| 1406 | * Stores information about bidirectional (left-to-right or right-to-left) |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1407 | * text within the layout of a line. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1408 | */ |
| 1409 | public static class Directions { |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1410 | // Directions represents directional runs within a line of text. |
| 1411 | // Runs are pairs of ints listed in visual order, starting from the |
| 1412 | // leading margin. The first int of each pair is the offset from |
| 1413 | // the first character of the line to the start of the run. The |
| 1414 | // second int represents both the length and level of the run. |
| 1415 | // The length is in the lower bits, accessed by masking with |
| 1416 | // DIR_LENGTH_MASK. The level is in the higher bits, accessed |
| 1417 | // by shifting by DIR_LEVEL_SHIFT and masking by DIR_LEVEL_MASK. |
| 1418 | // To simply test for an RTL direction, test the bit using |
| 1419 | // DIR_RTL_FLAG, if set then the direction is rtl. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1420 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1421 | /* package */ int[] mDirections; |
| 1422 | /* package */ Directions(int[] dirs) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1423 | mDirections = dirs; |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | /** |
| 1428 | * Return the offset of the first character to be ellipsized away, |
| 1429 | * relative to the start of the line. (So 0 if the beginning of the |
| 1430 | * line is ellipsized, not getLineStart().) |
| 1431 | */ |
| 1432 | public abstract int getEllipsisStart(int line); |
Doug Felt | e8e45f2 | 2010-03-29 14:58:40 -0700 | [diff] [blame^] | 1433 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1434 | /** |
| 1435 | * Returns the number of characters to be ellipsized away, or 0 if |
| 1436 | * no ellipsis is to take place. |
| 1437 | */ |
| 1438 | public abstract int getEllipsisCount(int line); |
| 1439 | |
| 1440 | /* package */ static class Ellipsizer implements CharSequence, GetChars { |
| 1441 | /* package */ CharSequence mText; |
| 1442 | /* package */ Layout mLayout; |
| 1443 | /* package */ int mWidth; |
| 1444 | /* package */ TextUtils.TruncateAt mMethod; |
| 1445 | |
| 1446 | public Ellipsizer(CharSequence s) { |
| 1447 | mText = s; |
| 1448 | } |
| 1449 | |
| 1450 | public char charAt(int off) { |
| 1451 | char[] buf = TextUtils.obtain(1); |
| 1452 | getChars(off, off + 1, buf, 0); |
| 1453 | char ret = buf[0]; |
| 1454 | |
| 1455 | TextUtils.recycle(buf); |
| 1456 | return ret; |
| 1457 | } |
| 1458 | |
| 1459 | public void getChars(int start, int end, char[] dest, int destoff) { |
| 1460 | int line1 = mLayout.getLineForOffset(start); |
| 1461 | int line2 = mLayout.getLineForOffset(end); |
| 1462 | |
| 1463 | TextUtils.getChars(mText, start, end, dest, destoff); |
| 1464 | |
| 1465 | for (int i = line1; i <= line2; i++) { |
| 1466 | mLayout.ellipsize(start, end, i, dest, destoff); |
| 1467 | } |
| 1468 | } |
| 1469 | |
| 1470 | public int length() { |
| 1471 | return mText.length(); |
| 1472 | } |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1473 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1474 | public CharSequence subSequence(int start, int end) { |
| 1475 | char[] s = new char[end - start]; |
| 1476 | getChars(start, end, s, 0); |
| 1477 | return new String(s); |
| 1478 | } |
| 1479 | |
| 1480 | public String toString() { |
| 1481 | char[] s = new char[length()]; |
| 1482 | getChars(0, length(), s, 0); |
| 1483 | return new String(s); |
| 1484 | } |
| 1485 | |
| 1486 | } |
| 1487 | |
| 1488 | /* package */ static class SpannedEllipsizer |
| 1489 | extends Ellipsizer implements Spanned { |
| 1490 | private Spanned mSpanned; |
| 1491 | |
| 1492 | public SpannedEllipsizer(CharSequence display) { |
| 1493 | super(display); |
| 1494 | mSpanned = (Spanned) display; |
| 1495 | } |
| 1496 | |
| 1497 | public <T> T[] getSpans(int start, int end, Class<T> type) { |
| 1498 | return mSpanned.getSpans(start, end, type); |
| 1499 | } |
| 1500 | |
| 1501 | public int getSpanStart(Object tag) { |
| 1502 | return mSpanned.getSpanStart(tag); |
| 1503 | } |
| 1504 | |
| 1505 | public int getSpanEnd(Object tag) { |
| 1506 | return mSpanned.getSpanEnd(tag); |
| 1507 | } |
| 1508 | |
| 1509 | public int getSpanFlags(Object tag) { |
| 1510 | return mSpanned.getSpanFlags(tag); |
| 1511 | } |
| 1512 | |
| 1513 | public int nextSpanTransition(int start, int limit, Class type) { |
| 1514 | return mSpanned.nextSpanTransition(start, limit, type); |
| 1515 | } |
| 1516 | |
| 1517 | public CharSequence subSequence(int start, int end) { |
| 1518 | char[] s = new char[end - start]; |
| 1519 | getChars(start, end, s, 0); |
| 1520 | |
| 1521 | SpannableString ss = new SpannableString(new String(s)); |
| 1522 | TextUtils.copySpansFrom(mSpanned, start, end, Object.class, ss, 0); |
| 1523 | return ss; |
| 1524 | } |
| 1525 | } |
| 1526 | |
| 1527 | private CharSequence mText; |
| 1528 | private TextPaint mPaint; |
| 1529 | /* package */ TextPaint mWorkPaint; |
| 1530 | private int mWidth; |
| 1531 | private Alignment mAlignment = Alignment.ALIGN_NORMAL; |
| 1532 | private float mSpacingMult; |
| 1533 | private float mSpacingAdd; |
| 1534 | private static Rect sTempRect = new Rect(); |
| 1535 | private boolean mSpannedText; |
| 1536 | |
| 1537 | public static final int DIR_LEFT_TO_RIGHT = 1; |
| 1538 | public static final int DIR_RIGHT_TO_LEFT = -1; |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1539 | |
Doug Felt | 20178d6 | 2010-02-22 13:39:01 -0800 | [diff] [blame] | 1540 | /* package */ static final int DIR_REQUEST_LTR = 1; |
| 1541 | /* package */ static final int DIR_REQUEST_RTL = -1; |
| 1542 | /* package */ static final int DIR_REQUEST_DEFAULT_LTR = 2; |
| 1543 | /* package */ static final int DIR_REQUEST_DEFAULT_RTL = -2; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1544 | |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1545 | /* package */ static final int RUN_LENGTH_MASK = 0x03ffffff; |
| 1546 | /* package */ static final int RUN_LEVEL_SHIFT = 26; |
| 1547 | /* package */ static final int RUN_LEVEL_MASK = 0x3f; |
| 1548 | /* package */ static final int RUN_RTL_FLAG = 1 << RUN_LEVEL_SHIFT; |
| 1549 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1550 | public enum Alignment { |
| 1551 | ALIGN_NORMAL, |
| 1552 | ALIGN_OPPOSITE, |
| 1553 | ALIGN_CENTER, |
| 1554 | // XXX ALIGN_LEFT, |
| 1555 | // XXX ALIGN_RIGHT, |
| 1556 | } |
| 1557 | |
| 1558 | private static final int TAB_INCREMENT = 20; |
| 1559 | |
| 1560 | /* package */ static final Directions DIRS_ALL_LEFT_TO_RIGHT = |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1561 | new Directions(new int[] { 0, RUN_LENGTH_MASK }); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1562 | /* package */ static final Directions DIRS_ALL_RIGHT_TO_LEFT = |
Doug Felt | 9f7a444 | 2010-03-01 12:45:56 -0800 | [diff] [blame] | 1563 | new Directions(new int[] { 0, RUN_LENGTH_MASK | RUN_RTL_FLAG }); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1564 | } |
| 1565 | |