third_party/WebKit/Source/core/layout/TableLayoutAlgorithmAuto.h

   1 /*
   2  * Copyright (C) 2002 Lars Knoll (knoll@kde.org)
   3  *           (C) 2002 Dirk Mueller (mueller@kde.org)
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Library General Public License
  16  * along with this library; see the file COPYING.LIB.  If not, write to
  17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  18  * Boston, MA 02110-1301, USA.
  19  */
  20
  21 #ifndef TableLayoutAlgorithmAuto_h
  22 #define TableLayoutAlgorithmAuto_h
  23
  24 #include "core/layout/TableLayoutAlgorithm.h"
  25 #include "platform/LayoutUnit.h"
  26 #include "platform/Length.h"
  27 #include "wtf/Vector.h"
  28
  29 namespace blink {
  30
  31 class LayoutTable;
  32 class LayoutTableCell;
  33
  34 enum CellsToProcess {
  35     AllCells,
  36     NonEmptyCells,
  37     EmptyCells
  38 };
  39
  40 enum DistributionMode {
  41     ExtraWidth,
  42     InitialWidth,
  43     LeftoverWidth
  44 };
  45
  46 enum DistributionDirection {
  47     StartToEnd,
  48     EndToStart
  49 };
  50
  51 class TableLayoutAlgorithmAuto final : public TableLayoutAlgorithm {
  52 public:
  53     TableLayoutAlgorithmAuto(LayoutTable*);
  54     ~TableLayoutAlgorithmAuto() override;
  55
  56     void computeIntrinsicLogicalWidths(LayoutUnit& minWidth, LayoutUnit& maxWidth) override;
  57     void applyPreferredLogicalWidthQuirks(LayoutUnit& minWidth, LayoutUnit& maxWidth) const override;
  58     void layout() override;
  59     void willChangeTableLayout() override { }
  60
  61 private:
  62     void fullRecalc();
  63     void recalcColumn(unsigned effCol);
  64
  65     int calcEffectiveLogicalWidth();
  66     void shrinkColumnWidth(const LengthType&, int& available);
  67     template<typename Total, LengthType, CellsToProcess, DistributionMode, DistributionDirection> void distributeWidthToColumns(int& available, Total);
  68
  69     void insertSpanCell(LayoutTableCell*);
  70
  71     struct Layout {
  72         Layout()
  73             : minLogicalWidth(0)
  74             , maxLogicalWidth(0)
  75             , effectiveMinLogicalWidth(0)
  76             , effectiveMaxLogicalWidth(0)
  77             , computedLogicalWidth(0)
  78             , emptyCellsOnly(true)
  79             , columnHasNoCells(true)
  80         {
  81         }
  82
  83         Length logicalWidth;
  84         Length effectiveLogicalWidth;
  85         int minLogicalWidth;
  86         int maxLogicalWidth;
  87         int effectiveMinLogicalWidth;
  88         int effectiveMaxLogicalWidth;
  89         int computedLogicalWidth;
  90         bool emptyCellsOnly;
  91         bool columnHasNoCells;
  92         int clampedEffectiveMaxLogicalWidth() { return std::max<int>(1, effectiveMaxLogicalWidth); }
  93     };
  94
  95     Vector<Layout, 4> m_layoutStruct;
  96     Vector<LayoutTableCell*, 4> m_spanCells;
  97     bool m_hasPercent : 1;
  98     mutable bool m_effectiveLogicalWidthDirty : 1;
  99 };
 100
 101 } // namespace blink
 102
 103 #endif // TableLayoutAlgorithmAuto