зеркало из https://github.com/mozilla/gecko-dev.git
231 строка
9.4 KiB
C++
231 строка
9.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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#ifndef BasicTableLayoutStrategy_h__
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#define BasicTableLayoutStrategy_h__
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#include "nscore.h"
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#include "nsITableLayoutStrategy.h"
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#include "nsCoord.h"
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class nsVoidArray;
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class nsTableFrame;
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struct nsStylePosition;
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struct nsStyleTable;
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static const PRInt32 kUninitialized=-1;
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/* ---------- BasicTableLayoutStrategy ---------- */
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/** Implementation of Nav4 compatible HTML browser table layout.
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* The input to this class is the results from pass1 table layout.
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* The output from this class is to set the column widths in
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* mTableFrame.
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*/
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class BasicTableLayoutStrategy : public nsITableLayoutStrategy
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{
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public:
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/** Public constructor.
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* @paran aFrame the table frame for which this delegate will do layout
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*/
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BasicTableLayoutStrategy(nsTableFrame *aFrame,
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PRBool aIsNavQuirksMode = PR_TRUE);
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/** destructor */
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virtual ~BasicTableLayoutStrategy();
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/** call every time any table thing changes that might effect the width of any column
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* in the table (content, structure, or style)
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* @param aMaxElementSize [OUT] if not null, the max element size is computed and returned in this param
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*/
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virtual PRBool Initialize(nsIPresContext* aPresContext,
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nsSize* aMaxElementSize,
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nscoord aMaxSize);
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/** compute the max element size of the table.
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* assumes that Initialize has been called
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*/
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virtual void SetMaxElementSize(nsSize* aMaxElementSize);
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void SetMinAndMaxTableContentWidths();
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/** Called during resize reflow to determine the new column widths
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* @param aTableStyle - the resolved style for mTableFrame
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* @param aReflowState - the reflow state for mTableFrame
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* @param aMaxWidth - the computed max width for columns to fit into
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*/
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virtual PRBool BalanceColumnWidths(nsIPresContext* aPresContext,
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nsIStyleContext* aTableStyle,
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const nsHTMLReflowState& aReflowState,
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nscoord aMaxWidth);
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// these accessors are mostly for debugging purposes
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nscoord GetTableMinContentWidth() const;
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nscoord GetTableMaxContentWidth() const;
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nscoord GetCOLSAttribute() const;
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void Dump(PRInt32 aIndent);
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protected:
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/** assign widths for each column.
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* if the column has a fixed coord width, use it.
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* if the column includes col spanning cells,
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* then distribute the fixed space between cells proportionately.
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* Computes the minimum and maximum table widths.
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* Set column width information in each column frame and in the table frame.
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*
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* @param aMaxWidth - the computed width of the table or
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* UNCONSTRAINED_SIZE if an auto width table
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* @return PR_TRUE if all is well, PR_FALSE if there was an unrecoverable error
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*
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*/
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virtual PRBool AssignPreliminaryColumnWidths(nsIPresContext* aPresContext,
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nscoord aComputedWidth);
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/**
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* Calculate the adjusted widths (min, desired, fixed, or pct) for a cell
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* spanning multiple columns.
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* @param aWidthIndex - the width to calculate (see nsTableColFrame.h for enums)
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* @param aCellFrame - the frame of the cell with a colspan
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* @param aColIndex - the column index of the cell in the table
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* @param aColSpan - the colspan of the cell
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* @param aConsiderPct - if true, consider columns that have pct widths and are spanned by the cell
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*/
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void ComputeColspanWidths(PRInt32 aWidthIndex,
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nsTableCellFrame* aCellFrame,
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PRInt32 aColIndex,
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PRInt32 aColSpan,
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PRBool aConsiderPct);
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/**
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* main helper for above. For min width calculations, it can get called up to
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* 3 times, 1st to let constrained (fix or pct) cols reach their limit, 2nd
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* to let auto cols reach their limit and 3rd to spread any remainder among
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* auto cols. If there are no auto cols then only constrained cols are considered.
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* @param aCellWidth - the width of the cell
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* @param aLimitType - value indicating which type of width is being targeted
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* to reach a limit
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* @return - true if the computation completed, false otherwise
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*/
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PRBool ComputeColspanWidths(PRInt32 aWidthIndex,
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nsTableCellFrame* aCellFrame,
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nscoord aCellWidth,
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PRInt32 aColIndex,
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PRInt32 aColSpan,
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PRBool aConsiderPct,
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PRInt32 aLimitType);
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nscoord AssignPercentageColumnWidths(nscoord aBasis,
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PRBool aTableIsAutoWidth);
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void CalculateTotals(PRInt32& aCellSpacing,
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PRInt32* aTotalCounts,
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PRInt32* aTotalWidths,
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PRInt32* aTotalAvailWidths,
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PRInt32* aMinWidths,
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PRInt32& a0ProportionalCount);
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void AllocateFully(nscoord& aTotalAllocated,
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PRInt32* aAllocTypes,
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PRInt32 aWidthType,
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PRBool aMarkAllocated = PR_TRUE);
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void AllocateConstrained(PRInt32 aAvailWidth,
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PRInt32 aWidthType,
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PRBool aStartAtMin,
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PRInt32* aAllocTypes);
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void AllocateUnconstrained(PRInt32 aAllocAmount,
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PRInt32* aAllocTypes,
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PRBool aSkip0Proportional);
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/** return true if the colIndex is in the list of colIndexes */
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virtual PRBool IsColumnInList(const PRInt32 colIndex,
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PRInt32 *colIndexes,
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PRInt32 aNumFixedColumns);
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/** returns true if the column is specified to have its min width */
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virtual PRBool ColIsSpecifiedAsMinimumWidth(PRInt32 aColIndex);
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/** eturns a list and count of all columns that behave like they have width=auto
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* this includes columns with no width specified (the normal definition of "auto"),
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* columns explicitly set to auto width,
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* and columns whose fixed width comes from a span (meaning the real width is indeterminate.)
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*
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* @param aOutNumColumns -- out param, the number of columns matching aType
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* @param aOutColumnIndexes -- out param, the indexes of the columns matching aType
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*
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* @return aOutNumColumns set to the number of auto columns, may be 0
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* allocates and fills aOutColumnIndexes
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* caller must "delete [] aOutColumnIndexes" if it is not null
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*/
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void GetColumnsThatActLikeAutoWidth(PRInt32& aOutNumColumns,
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PRInt32*& aOutColumnIndexes);
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void ContinuingFrameCheck();
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// see nsTableFrame::ColumnsCanBeInvalidatedBy
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PRBool ColumnsCanBeInvalidatedBy(nsStyleCoord* aPrevStyleWidth,
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const nsTableCellFrame& aCellFrame) const;
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// see nsTableFrame::ColumnsCanBeInvalidatedBy
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PRBool ColumnsCanBeInvalidatedBy(const nsTableCellFrame& aCellFrame,
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PRBool aConsiderMinWidth = PR_FALSE) const;
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// see nsTableFrame::ColumnsCanBeInvalidatedBy
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PRBool ColumnsAreValidFor(const nsTableCellFrame& aCellFrame,
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nscoord aPrevCellMin,
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nscoord aPrevCellDes) const;
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PRBool RecomputeAdjMinIfNecessary();
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#ifdef DEBUG
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void SizeOf(nsISizeOfHandler* aSizer, PRUint32* aResult) const {
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*aResult = sizeof(*this);
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}
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#endif
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protected:
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nsTableFrame * mTableFrame;
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PRInt32 mCols;
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// cached data
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nscoord mMinTableContentWidth; // the smallest size for the table (excluding border and padding)
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nscoord mMaxTableContentWidth; // the "natural" size for the table, if unconstrained (excluding border and padding)
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nscoord mCellSpacingTotal; // all of the cellspacing for all of the cols
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float mMinToDesProportionRatio;
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PRPackedBool mIsNavQuirksMode;
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};
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// these accessors are mostly for debugging purposes
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inline nscoord BasicTableLayoutStrategy::GetTableMinContentWidth() const
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{ return mMinTableContentWidth; };
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inline nscoord BasicTableLayoutStrategy::GetTableMaxContentWidth() const
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{ return mMaxTableContentWidth; };
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inline nscoord BasicTableLayoutStrategy::GetCOLSAttribute() const
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{ return mCols; };
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#endif
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