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| 1 /* | |
| 2 * Copyright (C) 2012 Apple 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 | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 | |
| 27 #ifndef RenderRegionSet_h | |
| 28 #define RenderRegionSet_h | |
| 29 | |
| 30 #include "core/rendering/RenderBoxRegionInfo.h" | |
| 31 #include "core/rendering/RenderRegion.h" | |
| 32 | |
| 33 namespace WebCore { | |
| 34 | |
| 35 class RenderFlowThread; | |
| 36 | |
| 37 // RenderRegionSet represents a set of regions that all have the same width and
height. It is a "composite region box" that | |
| 38 // can be used to represent a single run of contiguous regions. | |
| 39 // | |
| 40 // By combining runs of same-size columns or pages into a single object, we sign
ificantly reduce the number of unique RenderObjects | |
| 41 // required to represent those objects. | |
| 42 // | |
| 43 // This class is abstract and is only intended for use by renderers that generat
e anonymous runs of identical regions, i.e., | |
| 44 // columns and printing. RenderMultiColumnSet and RenderPageSet represent runs o
f columns and pages respectively. | |
| 45 // | |
| 46 // FIXME: For now we derive from RenderRegion, but this may change at some point
. | |
| 47 | |
| 48 class RenderRegionSet : public RenderRegion { | |
| 49 public: | |
| 50 RenderRegionSet(Element*, RenderFlowThread*); | |
| 51 | |
| 52 protected: | |
| 53 virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; } | |
| 54 | |
| 55 private: | |
| 56 virtual void installFlowThread() OVERRIDE FINAL; | |
| 57 | |
| 58 virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE FINAL; | |
| 59 | |
| 60 virtual const char* renderName() const = 0; | |
| 61 | |
| 62 virtual bool isRenderRegionSet() const OVERRIDE FINAL { return true; } | |
| 63 }; | |
| 64 | |
| 65 } // namespace WebCore | |
| 66 | |
| 67 #endif // RenderRegionSet_h | |
| 68 | |
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Chromium Code Reviews
Issue 143323014:
*** DO NOT LAND *** Attempt to understand Regions complexity
Base URL: svn://svn.chromium.org/blink/trunk