/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * Web-compatible algorithms that determine column and table isizes,
 * used for CSS2's 'table-layout: auto'.
 */

#ifndef BasicTableLayoutStrategy_h_
#define BasicTableLayoutStrategy_h_

#include "nsITableLayoutStrategy.h"

class nsTableFrame;

class BasicTableLayoutStrategy : public nsITableLayoutStrategy {
 public:
  explicit BasicTableLayoutStrategy(nsTableFrame* aTableFrame);
  virtual ~BasicTableLayoutStrategy();

  // nsITableLayoutStrategy implementation
  virtual nscoord GetMinISize(gfxContext* aRenderingContext) override;
  virtual nscoord GetPrefISize(gfxContext* aRenderingContext,
                               bool aComputingSize) override;
  virtual void MarkIntrinsicISizesDirty() override;
  virtual void ComputeColumnISizes(const ReflowInput& aReflowInput) override;

 private:
  // NOTE: Using prefix "BTLS" to avoid overlapping names with
  // the values of mozilla::IntrinsicISizeType.
  enum class BtlsISizeType : uint8_t { MinISize, PrefISize, FinalISize };

  // Compute intrinsic isize member variables on the columns.
  void ComputeColumnIntrinsicISizes(gfxContext* aRenderingContext);

  // Distribute a colspanning cell's percent isize (if any) to its columns.
  void DistributePctISizeToColumns(float aSpanPrefPct, int32_t aFirstCol,
                                   int32_t aColCount);

  // Distribute an isize of some BltsISizeType type to a set of columns.
  //  aISize: The amount of isize to be distributed
  //  aFirstCol: The index (in the table) of the first column to be
  //             considered for receiving isize
  //  aColCount: The number of consecutive columns (starting with aFirstCol)
  //             to be considered for receiving isize
  //  aISizeType: The type of isize being distributed.  (BTLS_MIN_ISIZE and
  //              BTLS_PREF_ISIZE are intended to be used for dividing up
  //              colspan's min & pref isize.  BTLS_FINAL_ISIZE is intended
  //              to be used for distributing the table's final isize across
  //              all its columns)
  //  aSpanHasSpecifiedISize: Should be true iff:
  //                           - We're distributing a colspanning cell's
  //                             pref or min isize to its columns
  //                           - The colspanning cell has a specified isize.
  void DistributeISizeToColumns(nscoord aISize, int32_t aFirstCol,
                                int32_t aColCount, BtlsISizeType aISizeType,
                                bool aSpanHasSpecifiedISize);

  // Compute the min and pref isizes of the table from the isize
  // variables on the columns.
  void ComputeIntrinsicISizes(gfxContext* aRenderingContext);

  nsTableFrame* mTableFrame;
  nscoord mMinISize;
  nscoord mPrefISize;
  nscoord mPrefISizePctExpand;
  nscoord mLastCalcISize;
};

#endif /* !defined(BasicTableLayoutStrategy_h_) */