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 #include "config.h" 27 #include "core/rendering/RenderRegionSet.h" 28 29 #include "core/rendering/RenderFlowThread.h" 30 31 namespace WebCore { 32 33 RenderRegionSet::RenderRegionSet(Element* element, RenderFlowThread* flowThread) 34 : RenderRegion(element, flowThread) 35 { 36 } 37 38 void RenderRegionSet::installFlowThread() 39 { 40 // We don't have to do anything, since we were able to connect the flow thread 41 // in the constructor. 42 } 43 44 void RenderRegionSet::expandToEncompassFlowThreadContentsIfNeeded() 45 { 46 // Whenever the last region is a set, it always expands its region rect to consume all 47 // of the flow thread content. This is because it is always capable of generating an 48 // infinite number of boxes in order to hold all of the remaining content. 49 LayoutRect rect(flowThreadPortionRect()); 50 51 // Get the offset within the flow thread in its block progression direction. Then get the 52 // flow thread's remaining logical height including its overflow and expand our rect 53 // to encompass that remaining height and overflow. The idea is that we will generate 54 // additional columns and pages to hold that overflow, since people do write bad 55 // content like <body style="height:0px"> in multi-column layouts. 56 bool isHorizontal = flowThread()->isHorizontalWritingMode(); 57 LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x(); 58 LayoutRect layoutRect = flowThread()->layoutOverflowRect(); 59 LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : layoutRect.maxX()) - logicalTopOffset; 60 setFlowThreadPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect.width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height())); 61 } 62 63 } 64
