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| 1 /* | |
| 2 * Copyright (C) 2013 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Neither the name of Google Inc. nor the names of its | |
| 11 * contributors may be used to endorse or promote products derived from | |
| 12 * this software without specific prior written permission. | |
| 13 * | |
| 14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 17 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 18 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 19 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 20 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 25 */ | |
| 26 | |
| 27 #ifndef WhitespaceChildList_h | |
| 28 #define WhitespaceChildList_h | |
| 29 | |
| 30 #include "core/dom/Text.h" | |
| 31 #include "core/rendering/style/RenderStyleConstants.h" | |
| 32 | |
| 33 namespace WebCore { | |
| 34 | |
| 35 class Text; | |
| 36 | |
| 37 // Tracks a limited number of whitespace text children during style recalc | |
| 38 // to postpone their style recalc as part of optimization to avoid creating | |
| 39 // unnecessary whitespace text renderers. If we hit the limit, it recalcs | |
| 40 // the whitespace text's style and clears the list. | |
| 41 class WhitespaceChildList { | |
| 42 public: | |
| 43 WhitespaceChildList(StyleRecalcChange change) | |
| 44 : m_change(change) | |
| 45 { } | |
| 46 | |
| 47 void append(Text* textChild) | |
| 48 { | |
| 49 ASSERT(textChild->containsOnlyWhitespace()); | |
| 50 if (m_list.size() == maxWhitespaceChildrenToDefer) { | |
| 51 recalcStyle(); | |
| 52 m_list.clear(); | |
| 53 } | |
| 54 m_list.append(textChild); | |
| 55 } | |
| 56 | |
| 57 void recalcStyle() const | |
| 58 { | |
| 59 for (unsigned i = 0; i < m_list.size(); ++i) | |
| 60 m_list[i]->recalcTextStyle(m_change); | |
| 61 } | |
| 62 private: | |
| 63 StyleRecalcChange m_change; | |
| 64 | |
| 65 static const unsigned maxWhitespaceChildrenToDefer = 10; | |
| 66 Vector<Text*, maxWhitespaceChildrenToDefer> m_list; | |
| 67 }; | |
| 68 | |
| 69 } // namespace WebCore | |
| 70 | |
| 71 #endif // WhitespaceChildList_h | |
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Chromium Code Reviews
Issue 58373002:
Whitespace only text nodes need to be reattached when their siblings are reattached (Closed)
Base URL: svn://svn.chromium.org/blink/trunk