TextLine.java revision f902d7bc49797ec277b4576c921dfffa15d741dd
1e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt/* 2e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Copyright (C) 2010 The Android Open Source Project 3e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 4e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Licensed under the Apache License, Version 2.0 (the "License"); 5e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * you may not use this file except in compliance with the License. 6e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * You may obtain a copy of the License at 7e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 8e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * http://www.apache.org/licenses/LICENSE-2.0 9e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 10e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Unless required by applicable law or agreed to in writing, software 11e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * distributed under the License is distributed on an "AS IS" BASIS, 12e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * See the License for the specific language governing permissions and 14e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * limitations under the License. 15e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 16e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 17e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltpackage android.text; 18e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 19e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport com.android.internal.util.ArrayUtils; 20e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 21e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Bitmap; 22e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Canvas; 23e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Paint; 24e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.graphics.Paint.FontMetricsInt; 25cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunneimport android.graphics.RectF; 26e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.Layout.Directions; 27c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Feltimport android.text.Layout.TabStops; 28e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.CharacterStyle; 29e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.MetricAffectingSpan; 30e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.text.style.ReplacementSpan; 31e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltimport android.util.Log; 32e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 33e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt/** 34e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Represents a line of styled text, for measuring in visual order and 35e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * for rendering. 36e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 37e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>Get a new instance using obtain(), and when finished with it, return it 38e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * to the pool using recycle(). 39e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 40e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>Call set to prepare the instance for use, then either draw, measure, 41e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * metrics, or caretToLeftRightOf. 42e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 43e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @hide 44e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 45e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Feltclass TextLine { 46e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private TextPaint mPaint; 47e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private CharSequence mText; 48e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mStart; 49e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mLen; 50e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private int mDir; 51e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private Directions mDirections; 52e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private boolean mHasTabs; 53c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt private TabStops mTabs; 54e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private char[] mChars; 55e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private boolean mCharsValid; 56e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private Spanned mSpanned; 57345cb03315a0813ec57e44f97fc3fa4af6b3c309Gilles Debunne private final TextPaint mWorkPaint = new TextPaint(); 58e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 59e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private static TextLine[] cached = new TextLine[3]; 60e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 61e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 62e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns a new TextLine from the shared pool. 63e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 64e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return an uninitialized TextLine 65e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 66e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt static TextLine obtain() { 67e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextLine tl; 68e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt synchronized (cached) { 69e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int i = cached.length; --i >= 0;) { 70e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cached[i] != null) { 71e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl = cached[i]; 72e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt cached[i] = null; 73e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return tl; 74e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 75e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 76e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 77e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl = new TextLine(); 78673e42fafd4088970ec95e1f13c61dc83132c74eChet Haase Log.v("TLINE", "new: " + tl); 79e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return tl; 80e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 81e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 82e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 83e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Puts a TextLine back into the shared pool. Do not use this TextLine once 84e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * it has been returned. 85e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param tl the textLine 86e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return null, as a convenience from clearing references to the provided 87e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * TextLine 88e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 89e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt static TextLine recycle(TextLine tl) { 90e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mText = null; 91e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mPaint = null; 92e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt tl.mDirections = null; 93f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne synchronized(cached) { 94f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne for (int i = 0; i < cached.length; ++i) { 95f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne if (cached[i] == null) { 96f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne cached[i] = tl; 97f902d7bc49797ec277b4576c921dfffa15d741ddGilles Debunne break; 98e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 99e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 100e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 101e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return null; 102e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 103e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 104e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 105e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Initializes a TextLine and prepares it for use. 106e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 107e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param paint the base paint for the line 108e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param text the text, can be Styled 109e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the line relative to the text 110e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the line relative to the text 111e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param dir the paragraph direction of this line 112e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param directions the directions information of this line 113e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param hasTabs true if the line might contain tabs or emoji 114c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt * @param tabStops the tabStops. Can be null. 115e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 116e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt void set(TextPaint paint, CharSequence text, int start, int limit, int dir, 117c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt Directions directions, boolean hasTabs, TabStops tabStops) { 118e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mPaint = paint; 119e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mText = text; 120e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mStart = start; 121e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mLen = limit - start; 122e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mDir = dir; 123e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mDirections = directions; 124e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mHasTabs = hasTabs; 125e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mSpanned = null; 126e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 127e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean hasReplacement = false; 128e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (text instanceof Spanned) { 129e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mSpanned = (Spanned) text; 130e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt hasReplacement = mSpanned.getSpans(start, limit, 131e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ReplacementSpan.class).length > 0; 132e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 133e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 134e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mCharsValid = hasReplacement || hasTabs || 135e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt directions != Layout.DIRS_ALL_LEFT_TO_RIGHT; 136e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 137e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 138e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mChars == null || mChars.length < mLen) { 139e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt mChars = new char[ArrayUtils.idealCharArraySize(mLen)]; 140e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 141e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextUtils.getChars(text, start, limit, mChars, 0); 1420c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (hasReplacement) { 1430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Handle these all at once so we don't have to do it as we go. 1440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Replace the first character of each replacement run with the 1450c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // object-replacement character and the remainder with zero width 1460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // non-break space aka BOM. Cursor movement code skips these 1470c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // zero-width characters. 1480c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt char[] chars = mChars; 1490c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int i = start, inext; i < limit; i = inext) { 1500c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt inext = mSpanned.nextSpanTransition(i, limit, 1510c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ReplacementSpan.class); 1520c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mSpanned.getSpans(i, inext, ReplacementSpan.class) 1530c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt .length > 0) { // transition into a span 1540c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt chars[i - start] = '\ufffc'; 1550c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = i - start + 1, e = inext - start; j < e; ++j) { 1560c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt chars[j] = '\ufeff'; // used as ZWNBS, marks positions to skip 1570c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1580c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1590c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 1600c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 161e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 162c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt mTabs = tabStops; 163e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 164e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 165e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 166e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Renders the TextLine. 167e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 168e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas to render on 169e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the leading margin position 170e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 171e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 172e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 173e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 174e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt void draw(Canvas c, float x, int top, int y, int bottom) { 175e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (!mHasTabs) { 176e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { 177e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt drawRun(c, 0, 0, mLen, false, x, top, y, bottom, false); 178e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return; 179e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 180e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { 181e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt drawRun(c, 0, 0, mLen, true, x, top, y, bottom, false); 182e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return; 183e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 184e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 185e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 186e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float h = 0; 187e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 188e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt RectF emojiRect = null; 189e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 190e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lastRunIndex = runs.length - 2; 191e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int i = 0; i < runs.length; i += 2) { 192e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runStart = runs[i]; 193e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); 194e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > mLen) { 195e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = mLen; 196e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 197e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; 198e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 199e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int segstart = runStart; 200e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt char[] chars = mChars; 201e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { 202e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int codept = 0; 203e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Bitmap bm = null; 204e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 205e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mHasTabs && j < runLimit) { 206e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = mChars[j]; 207e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { 208e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = Character.codePointAt(mChars, j); 209e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { 210e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); 211e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (codept > 0xffff) { 212e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ++j; 213e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 214e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 215e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 216e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 217e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 218e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (j == runLimit || codept == '\t' || bm != null) { 219e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += drawRun(c, i, segstart, j, runIsRtl, x+h, top, y, bottom, 220e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt i != lastRunIndex || j != mLen); 221e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 222e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept == '\t') { 223e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h = mDir * nextTab(h * mDir); 224e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (bm != null) { 225e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bmAscent = ascent(j); 226e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bitmapHeight = bm.getHeight(); 227e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float scale = -bmAscent / bitmapHeight; 228e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float width = bm.getWidth() * scale; 229e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 230e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (emojiRect == null) { 231e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt emojiRect = new RectF(); 232e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 233e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt emojiRect.set(x + h, y + bmAscent, 234e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt x + h + width, y); 235e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt c.drawBitmap(bm, null, emojiRect, mPaint); 236e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += width; 237e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt j++; 238e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 239e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt segstart = j + 1; 240e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 241e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 242e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 243e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 244e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 245e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 246e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns metrics information for the entire line. 247e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 248e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives font metrics information, can be null 249e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the line 250e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 251e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float metrics(FontMetricsInt fmi) { 252e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return measure(mLen, false, fmi); 253e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 254e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 255e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 256e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns information about a position on the line. 257e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 258e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the line-relative character offset, between 0 and the 259e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * line length, inclusive 260e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param trailing true to measure the trailing edge of the character 261e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * before offset, false to measure the leading edge of the character 262e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * at offset. 263e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information about the requested 264e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * character, can be null. 265e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed offset from the leading margin to the requested 266e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * character edge. 267e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 268e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float measure(int offset, boolean trailing, FontMetricsInt fmi) { 269e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int target = trailing ? offset - 1 : offset; 270e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (target < 0) { 271e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return 0; 272e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 273e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 274e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float h = 0; 275e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 276e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (!mHasTabs) { 277e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_LEFT_TO_RIGHT) { 2780c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return measureRun(0, 0, offset, mLen, false, fmi); 279e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 280e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mDirections == Layout.DIRS_ALL_RIGHT_TO_LEFT) { 2810b9d2ca6b6fc4574898cfff6acdee821d4723a96Doug Felt return measureRun(0, 0, offset, mLen, true, fmi); 282e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 283e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 284e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 285e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt char[] chars = mChars; 286e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 287e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int i = 0; i < runs.length; i += 2) { 288e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runStart = runs[i]; 289e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runLimit = runStart + (runs[i+1] & Layout.RUN_LENGTH_MASK); 290e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > mLen) { 291e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = mLen; 292e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 293e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runs[i+1] & Layout.RUN_RTL_FLAG) != 0; 294e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 295e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int segstart = runStart; 296e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = mHasTabs ? runStart : runLimit; j <= runLimit; j++) { 297e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int codept = 0; 298e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Bitmap bm = null; 299e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 300e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mHasTabs && j < runLimit) { 301e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = chars[j]; 302e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= 0xd800 && codept < 0xdc00 && j + 1 < runLimit) { 303e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt codept = Character.codePointAt(chars, j); 304e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept >= Layout.MIN_EMOJI && codept <= Layout.MAX_EMOJI) { 305e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt bm = Layout.EMOJI_FACTORY.getBitmapFromAndroidPua(codept); 306e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (codept > 0xffff) { 307e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ++j; 308e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 309e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 310e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 311e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 312e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 313e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (j == runLimit || codept == '\t' || bm != null) { 314e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean inSegment = target >= segstart && target < j; 315e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 316e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = (mDir == Layout.DIR_RIGHT_TO_LEFT) == runIsRtl; 317e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (inSegment && advance) { 318e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h += measureRun(i, segstart, offset, j, runIsRtl, fmi); 319e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 320e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 321e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float w = measureRun(i, segstart, j, j, runIsRtl, fmi); 322e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += advance ? w : -w; 323e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 324e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (inSegment) { 325e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h += measureRun(i, segstart, offset, j, runIsRtl, null); 326e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 327e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 328e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (codept == '\t') { 329e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (offset == j) { 330e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 331e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 332e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h = mDir * nextTab(h * mDir); 333e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (target == j) { 334e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 335e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 336e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 337e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 338e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (bm != null) { 339e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float bmAscent = ascent(j); 340e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float wid = bm.getWidth() * -bmAscent / bm.getHeight(); 341e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt h += mDir * wid; 342e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt j++; 343e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 344e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 345e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt segstart = j + 1; 346e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 347e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 348e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 349e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 350e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return h; 351e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 352e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 353e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 354e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Draws a unidirectional (but possibly multi-styled) run of text. 355e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 356e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas to draw on 357e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the index of this directional run 358e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start 359e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the line-relative limit 360e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 361e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the position of the run that is closest to the leading margin 362e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 363e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 364e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 365e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width value is required. 366e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run, based on the paragraph direction. 367e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Only valid if needWidth is true. 368e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 369e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private float drawRun(Canvas c, int runIndex, int start, 370e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int limit, boolean runIsRtl, float x, int top, int y, int bottom, 371e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean needWidth) { 372e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 373e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if ((mDir == Layout.DIR_LEFT_TO_RIGHT) == runIsRtl) { 374e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float w = -measureRun(runIndex, start, limit, limit, runIsRtl, null); 375e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt handleRun(runIndex, start, limit, limit, runIsRtl, c, x + w, top, 3760c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, null, false); 377e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return w; 378e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 379e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 380e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return handleRun(runIndex, start, limit, limit, runIsRtl, c, x, top, 3810c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, null, needWidth); 382e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 383e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 384e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 385e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Measures a unidirectional (but possibly multi-styled) run of text. 386e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 387e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the run index 388e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start of the run 389e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the offset to measure to, between start and limit inclusive 390e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the line-relative limit of the run 391e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 392e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information about the requested 393e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * run, can be null. 394e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width from the start of the run to the leading edge 395e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * of the character at offset, based on the run (not paragraph) direction 396e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 397e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private float measureRun(int runIndex, int start, 398e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int offset, int limit, boolean runIsRtl, FontMetricsInt fmi) { 399e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return handleRun(runIndex, start, offset, limit, runIsRtl, null, 4000c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 0, 0, 0, 0, fmi, true); 401e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 402e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 403e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 404e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Walk the cursor through this line, skipping conjuncts and 405e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * zero-width characters. 406e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 407e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * <p>This function cannot properly walk the cursor off the ends of the line 408e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * since it does not know about any shaping on the previous/following line 409e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * that might affect the cursor position. Callers must either avoid these 410e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * situations or handle the result specially. 411e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 412e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param cursor the starting position of the cursor, between 0 and the 413e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * length of the line, inclusive 414e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param toLeft true if the caret is moving to the left. 415e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the new offset. If it is less than 0 or greater than the length 416e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * of the line, the previous/following line should be examined to get the 417e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * actual offset. 418e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 419e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int getOffsetToLeftRightOf(int cursor, boolean toLeft) { 420e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 1) The caret marks the leading edge of a character. The character 421e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // logically before it might be on a different level, and the active caret 422e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // position is on the character at the lower level. If that character 423e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // was the previous character, the caret is on its trailing edge. 424e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 2) Take this character/edge and move it in the indicated direction. 425e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // This gives you a new character and a new edge. 426e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 3) This position is between two visually adjacent characters. One of 427e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // these might be at a lower level. The active position is on the 428e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // character at the lower level. 429e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // 4) If the active position is on the trailing edge of the character, 430e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the new caret position is the following logical character, else it 431e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // is the character. 432e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 433e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lineStart = 0; 434e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int lineEnd = mLen; 435e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean paraIsRtl = mDir == -1; 436e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int[] runs = mDirections.mDirections; 437e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 438e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runIndex, runLevel = 0, runStart = lineStart, runLimit = lineEnd, newCaret = -1; 439e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean trailing = false; 440e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 441e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor == lineStart) { 442e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = -2; 443e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else if (cursor == lineEnd) { 444e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = runs.length; 445e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 446e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // First, get information about the run containing the character with 447e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the active caret. 448e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (runIndex = 0; runIndex < runs.length; runIndex += 2) { 449e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runStart = lineStart + runs[runIndex]; 450e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor >= runStart) { 451e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = runStart + (runs[runIndex+1] & Layout.RUN_LENGTH_MASK); 452e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runLimit > lineEnd) { 453e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = lineEnd; 454e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 455e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor < runLimit) { 456e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = (runs[runIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & 457e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Layout.RUN_LEVEL_MASK; 458e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor == runStart) { 459e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The caret is on a run boundary, see if we should 460e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // use the position on the trailing edge of the previous 461e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // logical character instead. 462e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int prevRunIndex, prevRunLevel, prevRunStart, prevRunLimit; 463e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int pos = cursor - 1; 464e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (prevRunIndex = 0; prevRunIndex < runs.length; prevRunIndex += 2) { 465e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunStart = lineStart + runs[prevRunIndex]; 466e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (pos >= prevRunStart) { 467e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLimit = prevRunStart + 468e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt (runs[prevRunIndex+1] & Layout.RUN_LENGTH_MASK); 469e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (prevRunLimit > lineEnd) { 470e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLimit = lineEnd; 471e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 472e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (pos < prevRunLimit) { 473e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt prevRunLevel = (runs[prevRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) 474e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt & Layout.RUN_LEVEL_MASK; 475e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (prevRunLevel < runLevel) { 476e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Start from logically previous character. 477e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = prevRunIndex; 478e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = prevRunLevel; 479e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runStart = prevRunStart; 480e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLimit = prevRunLimit; 481e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt trailing = true; 482e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 483e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 484e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 485e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 486e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 487e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 488e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 489e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 490e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 491e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 492e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 493e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // caret might be == lineEnd. This is generally a space or paragraph 494e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // separator and has an associated run, but might be the end of 495e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // text, in which case it doesn't. If that happens, we ran off the 496e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // end of the run list, and runIndex == runs.length. In this case, 497e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // we are at a run boundary so we skip the below test. 498e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runIndex != runs.length) { 499e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean runIsRtl = (runLevel & 0x1) != 0; 500e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = toLeft == runIsRtl; 501e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (cursor != (advance ? runLimit : runStart) || advance != trailing) { 502e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Moving within or into the run, so we can move logically. 5030c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = getOffsetBeforeAfter(runIndex, runStart, runLimit, 5040c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt runIsRtl, cursor, advance); 505e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // If the new position is internal to the run, we're at the strong 506e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // position already so we're finished. 507e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret != (advance ? runLimit : runStart)) { 508e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return newCaret; 509e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 510e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 511e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 512e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 513e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 514e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // If newCaret is -1, we're starting at a run boundary and crossing 515e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // into another run. Otherwise we've arrived at a run boundary, and 516e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // need to figure out which character to attach to. Note we might 517e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // need to run this twice, if we cross a run boundary and end up at 518e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // another run boundary. 519e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt while (true) { 520e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean advance = toLeft == paraIsRtl; 521e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunIndex = runIndex + (advance ? 2 : -2); 522e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunIndex >= 0 && otherRunIndex < runs.length) { 523e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunStart = lineStart + runs[otherRunIndex]; 524e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunLimit = otherRunStart + 525e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt (runs[otherRunIndex+1] & Layout.RUN_LENGTH_MASK); 526e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunLimit > lineEnd) { 527e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt otherRunLimit = lineEnd; 528e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 529e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int otherRunLevel = (runs[otherRunIndex+1] >>> Layout.RUN_LEVEL_SHIFT) & 530e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Layout.RUN_LEVEL_MASK; 531e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt boolean otherRunIsRtl = (otherRunLevel & 1) != 0; 532e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 533e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt advance = toLeft == otherRunIsRtl; 534e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == -1) { 5350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = getOffsetBeforeAfter(otherRunIndex, otherRunStart, 5360c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt otherRunLimit, otherRunIsRtl, 537e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt advance ? otherRunStart : otherRunLimit, advance); 538e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == (advance ? otherRunLimit : otherRunStart)) { 539e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Crossed and ended up at a new boundary, 540e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // repeat a second and final time. 541e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runIndex = otherRunIndex; 542e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt runLevel = otherRunLevel; 543e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 544e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 545e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 546e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 547e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 548e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The new caret is at a boundary. 549e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (otherRunLevel < runLevel) { 550e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // The strong character is in the other run. 551e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt newCaret = advance ? otherRunStart : otherRunLimit; 552e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 553e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 554e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 555e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 556e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret == -1) { 557e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // We're walking off the end of the line. The paragraph 558e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // level is always equal to or lower than any internal level, so 559e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the boundaries get the strong caret. 5600c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt newCaret = advance ? mLen + 1 : -1; 561e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 562e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 563e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 564e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Else we've arrived at the end of the line. That's a strong position. 565e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // We might have arrived here by crossing over a run with no internal 566e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // breaks and dropping out of the above loop before advancing one final 567e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // time, so reset the caret. 568e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Note, we use '<=' below to handle a situation where the only run 569e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // on the line is a counter-directional run. If we're not advancing, 570e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // we can end up at the 'lineEnd' position but the caret we want is at 571e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // the lineStart. 572e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (newCaret <= lineEnd) { 573e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt newCaret = advance ? lineEnd : lineStart; 574e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 575e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt break; 576e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 577e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 578e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return newCaret; 579e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 580e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 581e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 582e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the next valid offset within this directional run, skipping 583e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * conjuncts and zero-width characters. This should not be called to walk 584cc3ec6cdb2b892eb29513e72d8b205acbe997b25Gilles Debunne * off the end of the line, since the returned values might not be valid 5850c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * on neighboring lines. If the returned offset is less than zero or 5860c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * greater than the line length, the offset should be recomputed on the 5870c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * preceding or following line, respectively. 588e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 589e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the run index 5900c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runStart the start of the run 5910c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runLimit the limit of the run 5920c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param runIsRtl true if the run is right-to-left 593e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param offset the offset 594e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param after true if the new offset should logically follow the provided 595e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * offset 596e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the new offset 597e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 5980c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private int getOffsetBeforeAfter(int runIndex, int runStart, int runLimit, 5990c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt boolean runIsRtl, int offset, boolean after) { 600e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 6010c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (runIndex < 0 || offset == (after ? mLen : 0)) { 6020c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // Walking off end of line. Since we don't know 6030c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // what cursor positions are available on other lines, we can't 6040c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // return accurate values. These are a guess. 605e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (after) { 6060c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return TextUtils.getOffsetAfter(mText, offset + mStart) - mStart; 6070c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6080c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return TextUtils.getOffsetBefore(mText, offset + mStart) - mStart; 6090c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6110c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt TextPaint wp = mWorkPaint; 6120c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt wp.set(mPaint); 6130c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6140c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int spanStart = runStart; 6150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int spanLimit; 6160c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mSpanned == null) { 6170c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanLimit = runLimit; 6180c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6190c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int target = after ? offset + 1 : offset; 6200c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int limit = mStart + runLimit; 6210c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt while (true) { 6220c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanLimit = mSpanned.nextSpanTransition(mStart + spanStart, limit, 6230c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan.class) - mStart; 6240c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (spanLimit >= target) { 6250c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt break; 626e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 6270c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt spanStart = spanLimit; 6280c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6290c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6300c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + spanStart, 6310c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + spanLimit, MetricAffectingSpan.class); 6320c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6330c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (spans.length > 0) { 6340c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ReplacementSpan replacement = null; 6350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = 0; j < spans.length; j++) { 6360c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt MetricAffectingSpan span = spans[j]; 6370c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (span instanceof ReplacementSpan) { 6380c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt replacement = (ReplacementSpan)span; 6390c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6400c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateMeasureState(wp); 6410c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6420c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 6430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 6440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (replacement != null) { 6450c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // If we have a replacement span, we're moving either to 6460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // the start or end of this span. 6470c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return after ? spanLimit : spanStart; 648e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 649e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 650e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 651e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 6520c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; 6530c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int cursorOpt = after ? Paint.CURSOR_AFTER : Paint.CURSOR_BEFORE; 6540c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mCharsValid) { 6550c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return wp.getTextRunCursor(mChars, spanStart, spanLimit - spanStart, 6560c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt flags, offset, cursorOpt); 6570c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 6580c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt return wp.getTextRunCursor(mText, mStart + spanStart, 659345cb03315a0813ec57e44f97fc3fa4af6b3c309Gilles Debunne mStart + spanLimit, flags, mStart + offset, cursorOpt) - mStart; 660e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 661e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 662e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 663e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 6640bb000931bb841e75903d655552d1626ae158707Gilles Debunne * @param wp 6650bb000931bb841e75903d655552d1626ae158707Gilles Debunne */ 6660bb000931bb841e75903d655552d1626ae158707Gilles Debunne private static void expandMetricsFromPaint(FontMetricsInt fmi, TextPaint wp) { 6670bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousTop = fmi.top; 6680bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousAscent = fmi.ascent; 6690bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousDescent = fmi.descent; 6700bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousBottom = fmi.bottom; 6710bb000931bb841e75903d655552d1626ae158707Gilles Debunne final int previousLeading = fmi.leading; 6720bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6730bb000931bb841e75903d655552d1626ae158707Gilles Debunne wp.getFontMetricsInt(fmi); 6740bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6750bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.top = Math.min(fmi.top, previousTop); 6760bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.ascent = Math.min(fmi.ascent, previousAscent); 6770bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.descent = Math.max(fmi.descent, previousDescent); 6780bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.bottom = Math.max(fmi.bottom, previousBottom); 6790bb000931bb841e75903d655552d1626ae158707Gilles Debunne fmi.leading = Math.max(fmi.leading, previousLeading); 6800bb000931bb841e75903d655552d1626ae158707Gilles Debunne } 6810bb000931bb841e75903d655552d1626ae158707Gilles Debunne 6820bb000931bb841e75903d655552d1626ae158707Gilles Debunne /** 683e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for measuring and rendering text. The text must 684e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * not include a tab or emoji. 685e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 686e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the working paint 687e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the text 6880c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param end the end of the text 689e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 690e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null if rendering is not needed 691e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the edge of the run closest to the leading margin 692e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 693e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 694e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 695e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 696e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width of the run is needed 697e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 698e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 699e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 7000c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private float handleText(TextPaint wp, int start, int end, 7010c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextStart, int contextEnd, boolean runIsRtl, 7020c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt Canvas c, float x, int top, int y, int bottom, 703e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt FontMetricsInt fmi, boolean needWidth) { 704e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 705e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ret = 0; 706e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7070c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int runLen = end - start; 7080c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextLen = contextEnd - contextStart; 709e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (needWidth || (c != null && (wp.bgColor != 0 || runIsRtl))) { 7100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int flags = runIsRtl ? Paint.DIRECTION_RTL : Paint.DIRECTION_LTR; 711e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 7120c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = wp.getTextRunAdvances(mChars, start, runLen, 7130c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt contextStart, contextLen, flags, null, 0); 714e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 7150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int delta = mStart; 7160c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = wp.getTextRunAdvances(mText, delta + start, 7170c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt delta + end, delta + contextStart, delta + contextEnd, 7180c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt flags, null, 0); 719e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 720e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 721e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 722e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (fmi != null) { 7230bb000931bb841e75903d655552d1626ae158707Gilles Debunne expandMetricsFromPaint(fmi, wp); 724e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 725e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 726e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (c != null) { 727e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (runIsRtl) { 728e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt x -= ret; 729e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 730e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 731e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (wp.bgColor != 0) { 732e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int color = wp.getColor(); 733e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt Paint.Style s = wp.getStyle(); 734e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setColor(wp.bgColor); 735e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setStyle(Paint.Style.FILL); 736e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 737e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt c.drawRect(x, top, x + ret, bottom, wp); 738e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 739e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setStyle(s); 740e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.setColor(color); 741e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 742e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7430c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt drawTextRun(c, wp, start, end, contextStart, contextEnd, runIsRtl, 7440c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, y + wp.baselineShift); 745e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 746e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 747e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return runIsRtl ? -ret : ret; 748e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 749e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 750e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 751e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for measuring and rendering a replacement. 752e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 753e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param replacement the replacement 754e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the work paint 755e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the run index 756e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the start of the run 757e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the run 758e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 759e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null if not rendering 760e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the edge of the replacement closest to the leading margin 761e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 762e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 763e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 764e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 765e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width of the replacement is needed 766e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 767e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 768e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 769e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private float handleReplacement(ReplacementSpan replacement, TextPaint wp, 770e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int runIndex, int start, int limit, boolean runIsRtl, Canvas c, 771e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float x, int top, int y, int bottom, FontMetricsInt fmi, 7720c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt boolean needWidth) { 773e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 774e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ret = 0; 775e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7760c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int textStart = mStart + start; 7770c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int textLimit = mStart + limit; 778e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7790c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (needWidth || (c != null && runIsRtl)) { 7800c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt ret = replacement.getSize(wp, mText, textStart, textLimit, fmi); 7810c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } 782e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 7830c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (c != null) { 7840c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (runIsRtl) { 7850c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x -= ret; 786e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 7870c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt replacement.draw(c, mText, textStart, textLimit, 7880c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, top, y, bottom, wp); 789e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 790e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 791e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return runIsRtl ? -ret : ret; 792e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 793e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 794e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 795e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Utility function for handling a unidirectional run. The run must not 796e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * contain tabs or emoji but can contain styles. 797e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 798e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIndex the run index 799e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param start the line-relative start of the run 8000c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param measureLimit the offset to measure to, between start and limit inclusive 801e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param limit the limit of the run 802e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 803e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas, can be null 804e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the end of the run closest to the leading margin 805e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param top the top of the line 806e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline 807e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param bottom the bottom of the line 808e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param fmi receives metrics information, can be null 809e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param needWidth true if the width is required 810e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the signed width of the run based on the run direction; only 811e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * valid if needWidth is true 812e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 8130c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private float handleRun(int runIndex, int start, int measureLimit, 814e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt int limit, boolean runIsRtl, Canvas c, float x, int top, int y, 8150c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int bottom, FontMetricsInt fmi, boolean needWidth) { 816e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 817e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // Shaping needs to take into account context up to metric boundaries, 818e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt // but rendering needs to take into account character style boundaries. 8190c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // So we iterate through metric runs to get metric bounds, 8200c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // then within each metric run iterate through character style runs 8210c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // for the run bounds. 822e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ox = x; 8230c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int i = start, inext; i < measureLimit; i = inext) { 824e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextPaint wp = mWorkPaint; 825e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.set(mPaint); 826e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8270c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int mlimit; 828e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mSpanned == null) { 829e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt inext = limit; 8300c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit = measureLimit; 831e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 832e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt inext = mSpanned.nextSpanTransition(mStart + i, mStart + limit, 833e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan.class) - mStart; 834e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8350c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit = inext < measureLimit ? inext : measureLimit; 836e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(mStart + i, 8370c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + mlimit, MetricAffectingSpan.class); 838e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 839e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (spans.length > 0) { 840e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt ReplacementSpan replacement = null; 841e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (int j = 0; j < spans.length; j++) { 842e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan span = spans[j]; 843e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (span instanceof ReplacementSpan) { 844e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt replacement = (ReplacementSpan)span; 845e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 8460c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // We might have a replacement that uses the draw 8470c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt // state, otherwise measure state would suffice. 8480c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateDrawState(wp); 849e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 850e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 851e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 852e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (replacement != null) { 853e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt x += handleReplacement(replacement, wp, runIndex, i, 8540c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mlimit, runIsRtl, c, x, top, y, bottom, fmi, 8550c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt needWidth || mlimit < measureLimit); 856e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt continue; 857e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 858e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 859e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 860e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8610c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt if (mSpanned == null || c == null) { 8620c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x += handleText(wp, i, mlimit, i, inext, runIsRtl, c, x, top, 8630c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt y, bottom, fmi, needWidth || mlimit < measureLimit); 8640c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt } else { 8650c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int j = i, jnext; j < mlimit; j = jnext) { 8660c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt jnext = mSpanned.nextSpanTransition(mStart + j, 8670c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + mlimit, CharacterStyle.class) - mStart; 868e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8690c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt CharacterStyle[] spans = mSpanned.getSpans(mStart + j, 8700c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt mStart + jnext, CharacterStyle.class); 871e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 8720c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt wp.set(mPaint); 8730c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt for (int k = 0; k < spans.length; k++) { 8740c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt CharacterStyle span = spans[k]; 8750c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt span.updateDrawState(wp); 876e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 8770c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt 8780c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x += handleText(wp, j, jnext, i, inext, runIsRtl, c, x, 8790c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt top, y, bottom, fmi, needWidth || jnext < measureLimit); 880e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 881e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 882e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 883e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 884e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return x - ox; 885e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 886e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 887e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 888e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Render a text run with the set-up paint. 889e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 890e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param c the canvas 891e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param wp the paint used to render the text 8920c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param start the start of the run 8930c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param end the end of the run 8940c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param contextStart the start of context for the run 8950c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt * @param contextEnd the end of the context for the run 896e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param runIsRtl true if the run is right-to-left 897e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param x the x position of the left edge of the run 898e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param y the baseline of the run 899e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 9000c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt private void drawTextRun(Canvas c, TextPaint wp, int start, int end, 9010c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextStart, int contextEnd, boolean runIsRtl, float x, int y) { 902e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 903f47d7405bbcb25d7cdf89ebb059f41520fe9ab87Doug Felt int flags = runIsRtl ? Canvas.DIRECTION_RTL : Canvas.DIRECTION_LTR; 904e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mCharsValid) { 9050c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int count = end - start; 9060c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int contextCount = contextEnd - contextStart; 9070c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt c.drawTextRun(mChars, start, count, contextStart, contextCount, 9080c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt x, y, flags, wp); 909e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } else { 9100c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt int delta = mStart; 9110c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt c.drawTextRun(mText, delta + start, delta + end, 9120c702b88c5d0d4380930b920f5be6e66dd95a0d8Doug Felt delta + contextStart, delta + contextEnd, x, y, flags, wp); 913e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 914e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 915e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 916e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 917e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the ascent of the text at start. This is used for scaling 918e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * emoji. 919e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 920e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param pos the line-relative position 921e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the ascent of the text at start 922e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 923e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float ascent(int pos) { 924e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (mSpanned == null) { 925e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return mPaint.ascent(); 926e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 927e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 928e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt pos += mStart; 929e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan[] spans = mSpanned.getSpans(pos, pos + 1, 930e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt MetricAffectingSpan.class); 931e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt if (spans.length == 0) { 932e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return mPaint.ascent(); 933e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 934e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 935e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt TextPaint wp = mWorkPaint; 936e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt wp.set(mPaint); 937e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt for (MetricAffectingSpan span : spans) { 938e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt span.updateMeasureState(wp); 939e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 940e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt return wp.ascent(); 941e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 942e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 943e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt /** 944e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * Returns the next tab position. 945e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * 946e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @param h the (unsigned) offset from the leading margin 947e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt * @return the (unsigned) tab position after this offset 948e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt */ 949e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt float nextTab(float h) { 950c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt if (mTabs != null) { 951c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt return mTabs.nextTab(h); 952e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 953c982f60e982c1d2df9f115ed9a5c3ef3643d0892Doug Felt return TabStops.nextDefaultStop(h, TAB_INCREMENT); 954e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt } 955e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt 956e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt private static final int TAB_INCREMENT = 20; 957e8e45f2c05cb3b6d23f30c8f96d8e0b3699cea7aDoug Felt} 958