layout/tables/BasicTableLayoutStrategy.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 // vim:cindent:ts=4:et:sw=4:
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /*
   8  * Web-compatible algorithms that determine column and table widths,
   9  * used for CSS2's 'table-layout: auto'.
  10  */
  11
  12 #ifndef BasicTableLayoutStrategy_h_
  13 #define BasicTableLayoutStrategy_h_
  14
  15 #include "mozilla/Attributes.h"
  16 #include "nsITableLayoutStrategy.h"
  17
  18 class nsTableFrame;
  19
  20 class BasicTableLayoutStrategy : public nsITableLayoutStrategy
  21 {
  22 public:
  23     explicit BasicTableLayoutStrategy(nsTableFrame *aTableFrame);
  24     virtual ~BasicTableLayoutStrategy();
  25
  26     // nsITableLayoutStrategy implementation
  27     virtual nscoord GetMinISize(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;
  28     virtual nscoord GetPrefISize(nsRenderingContext* aRenderingContext,
  29                                  bool aComputingSize) MOZ_OVERRIDE;
  30     virtual void MarkIntrinsicISizesDirty() MOZ_OVERRIDE;
  31     virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState) MOZ_OVERRIDE;
  32
  33 private:
  34     // NOTE: Using prefix "BTLS" to avoid overlapping names with
  35     // the values of nsLayoutUtils::IntrinsicISizeType
  36     enum BtlsWidthType { BTLS_MIN_WIDTH,
  37                          BTLS_PREF_WIDTH,
  38                          BTLS_FINAL_WIDTH };
  39
  40     // Compute intrinsic width member variables on the columns.
  41     void ComputeColumnIntrinsicISizes(nsRenderingContext* aRenderingContext);
  42
  43     // Distribute a colspanning cell's percent width (if any) to its columns.
  44     void DistributePctWidthToColumns(float aSpanPrefPct,
  45                                      int32_t aFirstCol,
  46                                      int32_t aColCount);
  47
  48     // Distribute a width of some BltsWidthType type to a set of columns.
  49     //  aWidth: The amount of width to be distributed
  50     //  aFirstCol: The index (in the table) of the first column to be
  51     //             considered for receiving width
  52     //  aColCount: The number of consecutive columns (starting with aFirstCol)
  53     //             to be considered for receiving width
  54     //  aWidthType: The type of width being distributed.  (BTLS_MIN_WIDTH and
  55     //              BTLS_PREF_WIDTH are intended to be used for dividing up
  56     //              colspan's min & pref width.  BTLS_FINAL_WIDTH is intended
  57     //              to be used for distributing the table's final width across
  58     //              all its columns)
  59     //  aSpanHasSpecifiedWidth: Should be true iff:
  60     //                           - We're distributing a colspanning cell's
  61     //                             pref or min width to its columns
  62     //                           - The colspanning cell has a specified width.
  63     void DistributeWidthToColumns(nscoord aWidth,
  64                                   int32_t aFirstCol,
  65                                   int32_t aColCount,
  66                                   BtlsWidthType aWidthType,
  67                                   bool aSpanHasSpecifiedWidth);
  68
  69
  70     // Compute the min and pref widths of the table from the width
  71     // variables on the columns.
  72     void ComputeIntrinsicISizes(nsRenderingContext* aRenderingContext);
  73
  74     nsTableFrame *mTableFrame;
  75     nscoord mMinWidth;
  76     nscoord mPrefWidth;
  77     nscoord mPrefWidthPctExpand;
  78     nscoord mLastCalcWidth;
  79 };
  80
  81 #endif /* !defined(BasicTableLayoutStrategy_h_) */