src/third_party/WebKit/Source/core/rendering/RenderNamedFlowFragment.cpp

   1 /*
   2  * Copyright (C) 2013 Adobe Systems Incorporated. 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  *
   8  * 1. Redistributions of source code must retain the above
   9  *    copyright notice, this list of conditions and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above
  12  *    copyright notice, this list of conditions and the following
  13  *    disclaimer in the documentation and/or other materials
  14  *    provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER "AS IS" AND ANY
  17  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
  20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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  22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  23  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  25  * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  26  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #include "config.h"
  31 #include "core/rendering/RenderNamedFlowFragment.h"
  32
  33 #include "core/rendering/FlowThreadController.h"
  34 #include "core/rendering/RenderBoxRegionInfo.h"
  35 #include "core/rendering/RenderFlowThread.h"
  36 #include "core/rendering/RenderNamedFlowThread.h"
  37 #include "core/rendering/RenderView.h"
  38
  39 using namespace std;
  40
  41 namespace WebCore {
  42
  43 RenderNamedFlowFragment::RenderNamedFlowFragment()
  44     : RenderRegion(0, 0)
  45 {
  46 }
  47
  48 RenderNamedFlowFragment::~RenderNamedFlowFragment()
  49 {
  50 }
  51
  52 RenderNamedFlowFragment* RenderNamedFlowFragment::createAnonymous(Document* document)
  53 {
  54     RenderNamedFlowFragment* region = new RenderNamedFlowFragment();
  55     region->setDocumentForAnonymous(document);
  56     return region;
  57 }
  58
  59 void RenderNamedFlowFragment::setStyleForNamedFlowFragment(const RenderStyle* parentStyle)
  60 {
  61     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK);
  62
  63     newStyle->setFlowThread(parentStyle->flowThread());
  64     newStyle->setRegionThread(parentStyle->regionThread());
  65     newStyle->setRegionFragment(parentStyle->regionFragment());
  66     newStyle->setShapeInside(parentStyle->shapeInside());
  67     newStyle->setOverflowX(parentStyle->overflowX());
  68     newStyle->setOverflowY(parentStyle->overflowY());
  69
  70     setStyle(newStyle.release());
  71 }
  72
  73 void RenderNamedFlowFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
  74 {
  75     RenderRegion::styleDidChange(diff, oldStyle);
  76
  77     if (parent() && parent()->needsLayout())
  78         setNeedsLayout();
  79 }
  80
  81 // FIXME: flex items as regions with flex-basis: 0 inside a flex container
  82 // with flex-direction: column should not be treated as auto-height regions
  83 bool RenderNamedFlowFragment::shouldHaveAutoLogicalHeight() const
  84 {
  85     ASSERT(parent());
  86
  87     RenderStyle* styleToUse = parent()->style();
  88     bool hasSpecifiedEndpointsForHeight = styleToUse->logicalTop().isSpecified() && styleToUse->logicalBottom().isSpecified();
  89     bool hasAnchoredEndpointsForHeight = isOutOfFlowPositioned() && hasSpecifiedEndpointsForHeight;
  90     bool hasAutoHeightStyle = styleToUse->logicalHeight().isAuto()
  91         || styleToUse->logicalHeight().isFitContent()
  92         || styleToUse->logicalHeight().isMaxContent()
  93         || styleToUse->logicalHeight().isMinContent();
  94     return hasAutoHeightStyle && !hasAnchoredEndpointsForHeight;
  95 }
  96
  97 LayoutUnit RenderNamedFlowFragment::maxPageLogicalHeight() const
  98 {
  99     ASSERT(m_flowThread);
 100     ASSERT(hasAutoLogicalHeight() && !m_flowThread->inConstrainedLayoutPhase());
 101     ASSERT(isAnonymous());
 102     ASSERT(parent());
 103
 104     RenderStyle* styleToUse = parent()->style();
 105     return styleToUse->logicalMaxHeight().isUndefined() ? RenderFlowThread::maxLogicalHeight() : toRenderBlock(parent())->computeReplacedLogicalHeightUsing(styleToUse->logicalMaxHeight());
 106 }
 107
 108 }