The Tor Browser: layout/tables/BasicTableLayoutStrategy.h@925c144e1f1f

     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/. */

     7 /*

     8  * Web-compatible algorithms that determine column and table widths,

     9  * used for CSS2's 'table-layout: auto'.

    10  */

    12 #ifndef BasicTableLayoutStrategy_h_

    13 #define BasicTableLayoutStrategy_h_

    15 #include "mozilla/Attributes.h"

    16 #include "nsITableLayoutStrategy.h"

    18 class nsTableFrame;

    20 class BasicTableLayoutStrategy : public nsITableLayoutStrategy

    21 {

    22 public:

    23     BasicTableLayoutStrategy(nsTableFrame *aTableFrame);

    24     virtual ~BasicTableLayoutStrategy();

    26     // nsITableLayoutStrategy implementation

    27     virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;

    28     virtual nscoord GetPrefWidth(nsRenderingContext* aRenderingContext,

    29                                  bool aComputingSize) MOZ_OVERRIDE;

    30     virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;

    31     virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState) MOZ_OVERRIDE;

    33 private:

    34     // NOTE: Using prefix "BTLS" to avoid overlapping names with

    35     // the values of nsLayoutUtils::IntrinsicWidthType

    36     enum BtlsWidthType { BTLS_MIN_WIDTH,

    37                          BTLS_PREF_WIDTH,

    38                          BTLS_FINAL_WIDTH };

    40     // Compute intrinsic width member variables on the columns.

    41     void ComputeColumnIntrinsicWidths(nsRenderingContext* aRenderingContext);

    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);

    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);

    70     // Compute the min and pref widths of the table from the width

    71     // variables on the columns.

    72     void ComputeIntrinsicWidths(nsRenderingContext* aRenderingContext);

    74     nsTableFrame *mTableFrame;

    75     nscoord mMinWidth;

    76     nscoord mPrefWidth;

    77     nscoord mPrefWidthPctExpand;

    78     nscoord mLastCalcWidth;

    79 };

    81 #endif /* !defined(BasicTableLayoutStrategy_h_) */

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