gecko/layout/tables/nsTableColGroupFrame.h
2012-05-21 12:12:37 +01:00

245 lines
8.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef nsTableColGroupFrame_h__
#define nsTableColGroupFrame_h__
#include "nscore.h"
#include "nsContainerFrame.h"
#include "nsTableColFrame.h"
#include "nsTablePainter.h"
class nsTableColFrame;
enum nsTableColGroupType {
eColGroupContent = 0, // there is real col group content associated
eColGroupAnonymousCol = 1, // the result of a col
eColGroupAnonymousCell = 2 // the result of a cell alone
};
/**
* nsTableColGroupFrame
* data structure to maintain information about a single table cell's frame
*
* @author sclark
*/
class nsTableColGroupFrame : public nsContainerFrame
{
public:
NS_DECL_FRAMEARENA_HELPERS
// default constructor supplied by the compiler
/** instantiate a new instance of nsTableRowFrame.
* @param aPresShell the pres shell for this frame
*
* @return the frame that was created
*/
friend nsIFrame* NS_NewTableColGroupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
/** Initialize the colgroup frame with a set of children.
* @see nsIFrame::SetInitialChildList
*/
NS_IMETHOD SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList);
/**
* ColGroups never paint anything, nor receive events.
*/
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists) { return NS_OK; }
/** A colgroup can be caused by three things:
* 1) An element with table-column-group display
* 2) An element with a table-column display without a
* table-column-group parent
* 3) Cells that are not in a column (and hence get an anonymous
* column and colgroup).
* @return colgroup type
*/
nsTableColGroupType GetColType() const;
/** Set the colgroup type based on the creation cause
* @param aType - the reason why this colgroup is needed
*/
void SetColType(nsTableColGroupType aType);
/** Real in this context are colgroups that come from an element
* with table-column-group display or wrap around columns that
* come from an element with table-column display. Colgroups
* that are the result of wrapping cells in an anonymous
* column and colgroup are not considered real here.
* @param aTableFrame - the table parent of the colgroups
* @return the last real colgroup
*/
static nsTableColGroupFrame* GetLastRealColGroup(nsTableFrame* aTableFrame);
/** @see nsIFrame::DidSetStyleContext */
virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
/** @see nsIFrame::AppendFrames, InsertFrames, RemoveFrame
*/
NS_IMETHOD AppendFrames(ChildListID aListID,
nsFrameList& aFrameList);
NS_IMETHOD InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList);
NS_IMETHOD RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame);
/** remove the column aChild from the column group, if requested renumber
* the subsequent columns in this column group and all following column
* groups. see also ResetColIndices for this
* @param aChild - the column frame that needs to be removed
* @param aResetSubsequentColIndices - if true the columns that follow
* after aChild will be reenumerated
*/
void RemoveChild(nsTableColFrame& aChild,
bool aResetSubsequentColIndices);
/** reflow of a column group is a trivial matter of reflowing
* the col group's children (columns), and setting this frame
* to 0-size. Since tables are row-centric, column group frames
* don't play directly in the rendering game. They do however
* maintain important state that effects table and cell layout.
*/
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
/**
* Get the "type" of the frame
*
* @see nsGkAtoms::tableColGroupFrame
*/
virtual nsIAtom* GetType() const;
/** Add column frames to the table storages: colframe cache and cellmap
* this doesn't change the mFrames of the colgroup frame.
* @param aFirstColIndex - the index at which aFirstFrame should be inserted
* into the colframe cache.
* @param aResetSubsequentColIndices - the indices of the col frames
* after the insertion might need
* an update
* @param aCols - an iterator that can be used to iterate over the col
* frames to be added. Once this is done, the frames on the
* sbling chain of its .get() at that point will still need
* their col indices updated.
* @result - if there is no table frame or the table frame is not
* the first in flow it will return an error
*/
nsresult AddColsToTable(PRInt32 aFirstColIndex,
bool aResetSubsequentColIndices,
const nsFrameList::Slice& aCols);
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
void Dump(PRInt32 aIndent);
#endif
/** returns the number of columns represented by this group.
* if there are col children, count them (taking into account the span of each)
* else, check my own span attribute.
*/
virtual PRInt32 GetColCount() const;
/** first column on the child list */
nsTableColFrame * GetFirstColumn();
/** next sibling to aChildFrame that is a column frame, first column frame
* in the column group if aChildFrame is null
*/
nsTableColFrame * GetNextColumn(nsIFrame *aChildFrame);
/** @return - the position of the first column in this colgroup in the table
* colframe cache.
*/
PRInt32 GetStartColumnIndex();
/** set the position of the first column in this colgroup in the table
* colframe cache.
*/
void SetStartColumnIndex(PRInt32 aIndex);
/** helper method to get the span attribute for this colgroup */
PRInt32 GetSpan();
/** provide access to the mFrames list
*/
nsFrameList& GetWritableChildList();
/** set the column index for all frames starting at aStartColFrame, it
* will also reset the column indices in all subsequent colgroups
* @param aFirstColGroup - start the reset operation inside this colgroup
* @param aFirstColIndex - first column that is reset should get this index
* @param aStartColFrame - if specified the reset starts with this column
* inside the colgroup; if not specified, the reset
* starts with the first column
*/
static void ResetColIndices(nsIFrame* aFirstColGroup,
PRInt32 aFirstColIndex,
nsIFrame* aStartColFrame = nsnull);
/**
* Gets inner border widths before collapsing with cell borders
* Caller must get left border from previous column
* GetContinuousBCBorderWidth will not overwrite aBorder.left
* see nsTablePainter about continuous borders
*/
void GetContinuousBCBorderWidth(nsMargin& aBorder);
/**
* Set full border widths before collapsing with cell borders
* @param aForSide - side to set; only accepts top and bottom
*/
void SetContinuousBCBorderWidth(PRUint8 aForSide,
BCPixelSize aPixelValue);
protected:
nsTableColGroupFrame(nsStyleContext* aContext);
void InsertColsReflow(PRInt32 aColIndex,
const nsFrameList::Slice& aCols);
/** implement abstract method on nsContainerFrame */
virtual PRIntn GetSkipSides() const;
// data members
PRInt32 mColCount;
// the starting column index this col group represents. Must be >= 0.
PRInt32 mStartColIndex;
// border width in pixels
BCPixelSize mTopContBorderWidth;
BCPixelSize mBottomContBorderWidth;
};
inline nsTableColGroupFrame::nsTableColGroupFrame(nsStyleContext *aContext)
: nsContainerFrame(aContext), mColCount(0), mStartColIndex(0)
{
SetColType(eColGroupContent);
}
inline PRInt32 nsTableColGroupFrame::GetStartColumnIndex()
{
return mStartColIndex;
}
inline void nsTableColGroupFrame::SetStartColumnIndex (PRInt32 aIndex)
{
mStartColIndex = aIndex;
}
inline PRInt32 nsTableColGroupFrame::GetColCount() const
{
return mColCount;
}
inline nsFrameList& nsTableColGroupFrame::GetWritableChildList()
{
return mFrames;
}
#endif