Source/core/rendering/RenderRegionSet.cpp - chromium/blink - Git at Google

 /*
  * 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.
  */

 #include "config.h"
 #include "core/rendering/RenderRegionSet.h"

 #include "core/rendering/RenderFlowThread.h"

 namespace WebCore {

 RenderRegionSet::RenderRegionSet(Element* element, RenderFlowThread* flowThread)
     : RenderRegion(element, flowThread)
 {
 }

 void RenderRegionSet::installFlowThread()
 {
     // We don't have to do anything, since we were able to connect the flow thread
     // in the constructor.
 }

 void RenderRegionSet::expandToEncompassFlowThreadContentsIfNeeded()
 {
     // Whenever the last region is a set, it always expands its region rect to consume all
     // of the flow thread content. This is because it is always capable of generating an
     // infinite number of boxes in order to hold all of the remaining content.
     LayoutRect rect(flowThreadPortionRect());

     // Get the offset within the flow thread in its block progression direction. Then get the
     // flow thread's remaining logical height including its overflow and expand our rect
     // to encompass that remaining height and overflow. The idea is that we will generate
     // additional columns and pages to hold that overflow, since people do write bad
     // content like <body style="height:0px"> in multi-column layouts.
     bool isHorizontal = flowThread()->isHorizontalWritingMode();
     LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x();
     LayoutRect layoutRect = flowThread()->layoutOverflowRect();
     LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : layoutRect.maxX()) - logicalTopOffset;
     setFlowThreadPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect.width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height()));
 }

 }
	/*
	* 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.
	*/

	#include "config.h"
	#include "core/rendering/RenderRegionSet.h"

	#include "core/rendering/RenderFlowThread.h"

	namespace WebCore {

	RenderRegionSet::RenderRegionSet(Element* element, RenderFlowThread* flowThread)
	: RenderRegion(element, flowThread)
	{
	}

	void RenderRegionSet::installFlowThread()
	{
	// We don't have to do anything, since we were able to connect the flow thread
	// in the constructor.
	}

	void RenderRegionSet::expandToEncompassFlowThreadContentsIfNeeded()
	{
	// Whenever the last region is a set, it always expands its region rect to consume all
	// of the flow thread content. This is because it is always capable of generating an
	// infinite number of boxes in order to hold all of the remaining content.
	LayoutRect rect(flowThreadPortionRect());

	// Get the offset within the flow thread in its block progression direction. Then get the
	// flow thread's remaining logical height including its overflow and expand our rect
	// to encompass that remaining height and overflow. The idea is that we will generate
	// additional columns and pages to hold that overflow, since people do write bad
	// content like <body style="height:0px"> in multi-column layouts.
	bool isHorizontal = flowThread()->isHorizontalWritingMode();
	LayoutUnit logicalTopOffset = isHorizontal ? rect.y() : rect.x();
	LayoutRect layoutRect = flowThread()->layoutOverflowRect();
	LayoutUnit logicalHeightWithOverflow = (isHorizontal ? layoutRect.maxY() : layoutRect.maxX()) - logicalTopOffset;
	setFlowThreadPortionRect(LayoutRect(rect.x(), rect.y(), isHorizontal ? rect.width() : logicalHeightWithOverflow, isHorizontal ? logicalHeightWithOverflow : rect.height()));
	}

	}