third_party/WebKit/Source/core/layout/line/LineLayoutState.h

   1 /*
   2  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
   3  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
   4  * Copyright (C) 2010 Google Inc. All rights reserved.
   5  * Copyright (C) 2014 Adobe Systems Incorporated. All rights reserved.
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public License
  18  * along with this library; see the file COPYING.LIB.  If not, write to
  19  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20  * Boston, MA 02110-1301, USA.
  21  *
  22  */
  23
  24 #ifndef LineLayoutState_h
  25 #define LineLayoutState_h
  26
  27 #include "core/layout/LayoutBlockFlow.h"
  28 #include "platform/geometry/LayoutRect.h"
  29 #include "wtf/Allocator.h"
  30
  31 namespace blink {
  32
  33 // Like LayoutState for layout(), LineLayoutState keeps track of global information
  34 // during an entire linebox tree layout pass (aka layoutInlineChildren).
  35 class LineLayoutState {
  36     STACK_ALLOCATED();
  37 public:
  38     LineLayoutState(bool fullLayout, LayoutUnit& paintInvalidationLogicalTop, LayoutUnit& paintInvalidationLogicalBottom, LayoutFlowThread* flowThread)
  39         : m_lastFloat(nullptr)
  40         , m_endLine(nullptr)
  41         , m_floatIndex(0)
  42         , m_endLineLogicalTop(0)
  43         , m_endLineMatched(false)
  44         , m_hasInlineChild(false)
  45         , m_isFullLayout(fullLayout)
  46         , m_paintInvalidationLogicalTop(paintInvalidationLogicalTop)
  47         , m_paintInvalidationLogicalBottom(paintInvalidationLogicalBottom)
  48         , m_adjustedLogicalLineTop(0)
  49         , m_usesPaintInvalidationBounds(false)
  50         , m_flowThread(flowThread)
  51     { }
  52
  53     void markForFullLayout() { m_isFullLayout = true; }
  54     bool isFullLayout() const { return m_isFullLayout; }
  55
  56     bool usesPaintInvalidationBounds() const { return m_usesPaintInvalidationBounds; }
  57
  58     void setPaintInvalidationRange(LayoutUnit logicalHeight)
  59     {
  60         m_usesPaintInvalidationBounds = true;
  61         m_paintInvalidationLogicalTop = m_paintInvalidationLogicalBottom = logicalHeight;
  62     }
  63
  64     void updatePaintInvalidationRangeFromBox(RootInlineBox* box, LayoutUnit paginationDelta = 0)
  65     {
  66         m_usesPaintInvalidationBounds = true;
  67         m_paintInvalidationLogicalTop = std::min(m_paintInvalidationLogicalTop, box->logicalTopVisualOverflow() + std::min<LayoutUnit>(paginationDelta, 0));
  68         m_paintInvalidationLogicalBottom = std::max(m_paintInvalidationLogicalBottom, box->logicalBottomVisualOverflow() + std::max<LayoutUnit>(paginationDelta, 0));
  69     }
  70
  71     bool endLineMatched() const { return m_endLineMatched; }
  72     void setEndLineMatched(bool endLineMatched) { m_endLineMatched = endLineMatched; }
  73
  74     bool hasInlineChild() const { return m_hasInlineChild; }
  75     void setHasInlineChild(bool hasInlineChild) { m_hasInlineChild = hasInlineChild; }
  76
  77
  78     LineInfo& lineInfo() { return m_lineInfo; }
  79     const LineInfo& lineInfo() const { return m_lineInfo; }
  80
  81     LayoutUnit endLineLogicalTop() const { return m_endLineLogicalTop; }
  82     void setEndLineLogicalTop(LayoutUnit logicalTop) { m_endLineLogicalTop = logicalTop; }
  83
  84     RootInlineBox* endLine() const { return m_endLine; }
  85     void setEndLine(RootInlineBox* line) { m_endLine = line; }
  86
  87     FloatingObject* lastFloat() const { return m_lastFloat; }
  88     void setLastFloat(FloatingObject* lastFloat) { m_lastFloat = lastFloat; }
  89
  90     Vector<LayoutBlockFlow::FloatWithRect>& floats() { return m_floats; }
  91
  92     unsigned floatIndex() const { return m_floatIndex; }
  93     void setFloatIndex(unsigned floatIndex) { m_floatIndex = floatIndex; }
  94
  95     LayoutUnit adjustedLogicalLineTop() const { return m_adjustedLogicalLineTop; }
  96     void setAdjustedLogicalLineTop(LayoutUnit value) { m_adjustedLogicalLineTop = value; }
  97
  98     LayoutFlowThread* flowThread() const { return m_flowThread; }
  99
 100 private:
 101     Vector<LayoutBlockFlow::FloatWithRect> m_floats;
 102     FloatingObject* m_lastFloat;
 103     RootInlineBox* m_endLine;
 104     LineInfo m_lineInfo;
 105     unsigned m_floatIndex;
 106     LayoutUnit m_endLineLogicalTop;
 107     bool m_endLineMatched;
 108     // Used as a performance optimization to avoid doing a full paint invalidation when our floats
 109     // change but we don't have any inline children.
 110     bool m_hasInlineChild;
 111
 112     bool m_isFullLayout;
 113
 114     // FIXME: Should this be a range object instead of two ints?
 115     LayoutUnit& m_paintInvalidationLogicalTop;
 116     LayoutUnit& m_paintInvalidationLogicalBottom;
 117
 118     LayoutUnit m_adjustedLogicalLineTop;
 119
 120     bool m_usesPaintInvalidationBounds;
 121
 122     LayoutFlowThread* m_flowThread;
 123 };
 124
 125 }
 126
 127 #endif // LineLayoutState_h