BasicTableLayoutStrategy.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

// vim:cindent:ts=4:et:sw=4:

/* 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 "mozilla/Attributes.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 nsLayoutUtils::IntrinsicISizeType

  enum BtlsISizeType { BTLS_MIN_ISIZE, BTLS_PREF_ISIZE, BTLS_FINAL_ISIZE };

  // 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_) */