michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: // vim:cindent:ts=4:et:sw=4:
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * Web-compatible algorithms that determine column and table widths,
michael@0:  * used for CSS2's 'table-layout: auto'.
michael@0:  */
michael@0: 
michael@0: #ifndef BasicTableLayoutStrategy_h_
michael@0: #define BasicTableLayoutStrategy_h_
michael@0: 
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "nsITableLayoutStrategy.h"
michael@0: 
michael@0: class nsTableFrame;
michael@0: 
michael@0: class BasicTableLayoutStrategy : public nsITableLayoutStrategy
michael@0: {
michael@0: public:
michael@0:     BasicTableLayoutStrategy(nsTableFrame *aTableFrame);
michael@0:     virtual ~BasicTableLayoutStrategy();
michael@0: 
michael@0:     // nsITableLayoutStrategy implementation
michael@0:     virtual nscoord GetMinWidth(nsRenderingContext* aRenderingContext) MOZ_OVERRIDE;
michael@0:     virtual nscoord GetPrefWidth(nsRenderingContext* aRenderingContext,
michael@0:                                  bool aComputingSize) MOZ_OVERRIDE;
michael@0:     virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
michael@0:     virtual void ComputeColumnWidths(const nsHTMLReflowState& aReflowState) MOZ_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     // NOTE: Using prefix "BTLS" to avoid overlapping names with 
michael@0:     // the values of nsLayoutUtils::IntrinsicWidthType
michael@0:     enum BtlsWidthType { BTLS_MIN_WIDTH, 
michael@0:                          BTLS_PREF_WIDTH, 
michael@0:                          BTLS_FINAL_WIDTH };
michael@0: 
michael@0:     // Compute intrinsic width member variables on the columns.
michael@0:     void ComputeColumnIntrinsicWidths(nsRenderingContext* aRenderingContext);
michael@0: 
michael@0:     // Distribute a colspanning cell's percent width (if any) to its columns.
michael@0:     void DistributePctWidthToColumns(float aSpanPrefPct,
michael@0:                                      int32_t aFirstCol,
michael@0:                                      int32_t aColCount);
michael@0: 
michael@0:     // Distribute a width of some BltsWidthType type to a set of columns.
michael@0:     //  aWidth: The amount of width to be distributed
michael@0:     //  aFirstCol: The index (in the table) of the first column to be
michael@0:     //             considered for receiving width
michael@0:     //  aColCount: The number of consecutive columns (starting with aFirstCol)
michael@0:     //             to be considered for receiving width
michael@0:     //  aWidthType: The type of width being distributed.  (BTLS_MIN_WIDTH and
michael@0:     //              BTLS_PREF_WIDTH are intended to be used for dividing up
michael@0:     //              colspan's min & pref width.  BTLS_FINAL_WIDTH is intended
michael@0:     //              to be used for distributing the table's final width across
michael@0:     //              all its columns)
michael@0:     //  aSpanHasSpecifiedWidth: Should be true iff:
michael@0:     //                           - We're distributing a colspanning cell's
michael@0:     //                             pref or min width to its columns
michael@0:     //                           - The colspanning cell has a specified width.
michael@0:     void DistributeWidthToColumns(nscoord aWidth, 
michael@0:                                   int32_t aFirstCol, 
michael@0:                                   int32_t aColCount,
michael@0:                                   BtlsWidthType aWidthType,
michael@0:                                   bool aSpanHasSpecifiedWidth);
michael@0:  
michael@0: 
michael@0:     // Compute the min and pref widths of the table from the width
michael@0:     // variables on the columns.
michael@0:     void ComputeIntrinsicWidths(nsRenderingContext* aRenderingContext);
michael@0: 
michael@0:     nsTableFrame *mTableFrame;
michael@0:     nscoord mMinWidth;
michael@0:     nscoord mPrefWidth;
michael@0:     nscoord mPrefWidthPctExpand;
michael@0:     nscoord mLastCalcWidth;
michael@0: };
michael@0: 
michael@0: #endif /* !defined(BasicTableLayoutStrategy_h_) */