/* * Copyright (C) 2012 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef RenderMultiColumnSet_h #define RenderMultiColumnSet_h #include "RenderRegionSet.h" namespace WebCore { // RenderMultiColumnSet represents a set of columns that all have the same width and height. By combining runs of same-size columns into a single // object, we significantly reduce the number of unique RenderObjects required to represent columns. // // A simple multi-column block will have exactly one RenderMultiColumnSet child. A simple paginated multi-column block will have three // RenderMultiColumnSet children: one for the content at the bottom of the first page (whose columns will have a shorter height), one // for the 2nd to n-1 pages, and then one last column set that will hold the shorter columns on the final page (that may have to be balanced // as well). // // Column spans result in the creation of new column sets as well, since a spanning region has to be placed in between the column sets that // come before and after the span. class RenderMultiColumnSet : public RenderRegionSet { public: RenderMultiColumnSet(Node*, RenderFlowThread*); private: virtual const char* renderName() const; }; } // namespace WebCore #endif // RenderMultiColumnSet_h