The Tor Browser: layout/tables/nsTableRowGroupFrame.h@44a2da4a2ab2 (annotated)

layout/tables/nsTableRowGroupFrame.h@44a2da4a2ab2 (annotated)

layout/tables/nsTableRowGroupFrame.h

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 /* -*- 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 nsTableRowGroupFrame_h__
 #define nsTableRowGroupFrame_h__
 #include "mozilla/Attributes.h"
 #include "nscore.h"
 #include "nsContainerFrame.h"
 #include "nsIAtom.h"
 #include "nsILineIterator.h"
 #include "nsTablePainter.h"
 #include "nsTArray.h"
 class nsTableFrame;
 class nsTableRowFrame;
 class nsTableCellFrame;
 struct nsRowGroupReflowState {
   const nsHTMLReflowState& reflowState;  // Our reflow state
   nsTableFrame* tableFrame;
   // The available size (computed from the parent)
   nsSize availSize;
   // Running y-offset
   nscoord y;
   nsRowGroupReflowState(const nsHTMLReflowState& aReflowState,
                         nsTableFrame*            aTableFrame)
       :reflowState(aReflowState), tableFrame(aTableFrame)
   {
     availSize.width  = reflowState.AvailableWidth();
     availSize.height = reflowState.AvailableHeight();
     y = 0;
   }
   ~nsRowGroupReflowState() {}
 };
 #define MIN_ROWS_NEEDING_CURSOR 20
 /**
  * nsTableRowGroupFrame is the frame that maps row groups
  * (HTML tags THEAD, TFOOT, and TBODY). This class cannot be reused
  * outside of an nsTableFrame.  It assumes that its parent is an nsTableFrame, and
  * its children are nsTableRowFrames.
  *
  * @see nsTableFrame
  * @see nsTableRowFrame
  */
 class nsTableRowGroupFrame
   : public nsContainerFrame
   , public nsILineIterator
 {
 public:
   NS_DECL_QUERYFRAME_TARGET(nsTableRowGroupFrame)
   NS_DECL_QUERYFRAME
   NS_DECL_FRAMEARENA_HELPERS
   /** instantiate a new instance of nsTableRowFrame.
     * @param aPresShell the pres shell for this frame
     *
     * @return           the frame that was created
     */
   friend nsIFrame* NS_NewTableRowGroupFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
   virtual ~nsTableRowGroupFrame();
   virtual void DestroyFrom(nsIFrame* aDestructRoot) MOZ_OVERRIDE;
   /** @see nsIFrame::DidSetStyleContext */
   virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext) MOZ_OVERRIDE;
   virtual nsresult AppendFrames(ChildListID     aListID,
                                 nsFrameList&    aFrameList) MOZ_OVERRIDE;
   virtual nsresult InsertFrames(ChildListID     aListID,
                                 nsIFrame*       aPrevFrame,
                                 nsFrameList&    aFrameList) MOZ_OVERRIDE;
   virtual nsresult RemoveFrame(ChildListID     aListID,
                                nsIFrame*       aOldFrame) MOZ_OVERRIDE;
   virtual nsMargin GetUsedMargin() const MOZ_OVERRIDE;
   virtual nsMargin GetUsedBorder() const MOZ_OVERRIDE;
   virtual nsMargin GetUsedPadding() const MOZ_OVERRIDE;
   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                                 const nsRect&           aDirtyRect,
                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE;
    /** calls Reflow for all of its child rows.
     * Rows are all set to the same width and stacked vertically.
     * <P> rows are not split unless absolutely necessary.
     *
     * @param aDesiredSize width set to width of rows, height set to
     *                     sum of height of rows that fit in aMaxSize.height.
     *
     * @see nsIFrame::Reflow
     */
   virtual nsresult Reflow(nsPresContext*           aPresContext,
                           nsHTMLReflowMetrics&     aDesiredSize,
                           const nsHTMLReflowState& aReflowState,
                           nsReflowStatus&          aStatus) MOZ_OVERRIDE;
   virtual bool UpdateOverflow() MOZ_OVERRIDE;
   /**
    * Get the "type" of the frame
    *
    * @see nsGkAtoms::tableRowGroupFrame
    */
   virtual nsIAtom* GetType() const MOZ_OVERRIDE;
   nsTableRowFrame* GetFirstRow();
 #ifdef DEBUG_FRAME_DUMP
   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE;
 #endif
   /** return the number of child rows (not necessarily == number of child frames) */
   int32_t GetRowCount();
   /** return the table-relative row index of the first row in this rowgroup.
     * if there are no rows, -1 is returned.
     */
   int32_t GetStartRowIndex();
   /** Adjust the row indices of all rows  whose index is >= aRowIndex.
     * @param aRowIndex   - start adjusting with this index
     * @param aAdjustment - shift the row index by this amount
     */
   void AdjustRowIndices(int32_t   aRowIndex,
                         int32_t   anAdjustment);
   /**
    * Used for header and footer row group frames that are repeated when
    * splitting a table frame.
    *
    * Performs any table specific initialization
    *
    * @param aHeaderFooterFrame the original header or footer row group frame
    * that was repeated
    */
   nsresult  InitRepeatedFrame(nsPresContext*        aPresContext,
                               nsTableRowGroupFrame* aHeaderFooterFrame);
   /**
    * Get the total height of all the row rects
    */
   nscoord GetHeightBasis(const nsHTMLReflowState& aReflowState);
   nsMargin* GetBCBorderWidth(nsMargin& aBorder);
   /**
    * Gets inner border widths before collapsing with cell borders
    * Caller must get top border from previous row group or from table
    * GetContinuousBCBorderWidth will not overwrite aBorder.top
    * see nsTablePainter about continuous borders
    */
   void GetContinuousBCBorderWidth(nsMargin& aBorder);
   /**
    * Sets full border widths before collapsing with cell borders
    * @param aForSide - side to set; only right, left, and bottom valid
    */
   void SetContinuousBCBorderWidth(uint8_t     aForSide,
                                   BCPixelSize aPixelValue);
   /**
     * Adjust to the effect of visibibility:collapse on the row group and
     * its children
     * @return              additional shift upward that should be applied to
     *                      subsequent rowgroups due to rows and this rowgroup
     *                      being collapsed
     * @param aYTotalOffset the total amount that the rowgroup is shifted up
     * @param aWidth        new width of the rowgroup
     */
   nscoord CollapseRowGroupIfNecessary(nscoord aYTotalOffset,
                                       nscoord aWidth);
 // nsILineIterator methods
 public:
   virtual void DisposeLineIterator() MOZ_OVERRIDE { }
   // The table row is the equivalent to a line in block layout.
   // The nsILineIterator assumes that a line resides in a block, this role is
   // fullfilled by the row group. Rows in table are counted relative to the
   // table. The row index of row corresponds to the cellmap coordinates. The
   // line index with respect to a row group can be computed by substracting the
   // row index of the first row in the row group.
   /** Get the number of rows in a row group
     * @return the number of lines in a row group
     */
   virtual int32_t GetNumLines() MOZ_OVERRIDE;
   /** @see nsILineIterator.h GetDirection
     * @return true if the table is rtl
     */
   virtual bool GetDirection() MOZ_OVERRIDE;
   /** Return structural information about a line.
     * @param aLineNumber       - the index of the row relative to the row group
     *                            If the line-number is invalid then
     *                            aFirstFrameOnLine will be nullptr and
     *                            aNumFramesOnLine will be zero.
     * @param aFirstFrameOnLine - the first cell frame that originates in row
     *                            with a rowindex that matches a line number
     * @param aNumFramesOnLine  - return the numbers of cells originating in
     *                            this row
     * @param aLineBounds       - rect of the row
     * @param aLineFlags        - unused set to 0
     */
   NS_IMETHOD GetLine(int32_t aLineNumber,
                      nsIFrame** aFirstFrameOnLine,
                      int32_t* aNumFramesOnLine,
                      nsRect& aLineBounds,
                      uint32_t* aLineFlags) MOZ_OVERRIDE;
   /** Given a frame that's a child of the rowgroup, find which line its on.
     * @param aFrame       - frame, should be a row
     * @param aStartLine   - minimal index to return
     * @return               row index relative to the row group if this a row
     *                       frame and the index is at least aStartLine.
     *                       -1 if the frame cannot be found.
     */
   virtual int32_t FindLineContaining(nsIFrame* aFrame, int32_t aStartLine = 0) MOZ_OVERRIDE;
   /** Find the orginating cell frame on a row that is the nearest to the
     * coordinate X.
     * @param aLineNumber          - the index of the row relative to the row group
     * @param aX                   - X coordinate in twips relative to the
     *                               origin of the row group
     * @param aFrameFound          - pointer to the cellframe
     * @param aXIsBeforeFirstFrame - the point is before the first originating
     *                               cellframe
     * @param aXIsAfterLastFrame   - the point is after the last originating
     *                               cellframe
     */
   NS_IMETHOD FindFrameAt(int32_t aLineNumber,
                          nscoord aX,
                          nsIFrame** aFrameFound,
                          bool* aXIsBeforeFirstFrame,
                          bool* aXIsAfterLastFrame) MOZ_OVERRIDE;
    /** Check whether visual and logical order of cell frames within a line are
      * identical. As the layout will reorder them this is always the case
      * @param aLine        - the index of the row relative to the table
      * @param aIsReordered - returns false
      * @param aFirstVisual - if the table is rtl first originating cell frame
      * @param aLastVisual  - if the table is rtl last originating cell frame
      */
   NS_IMETHOD CheckLineOrder(int32_t                  aLine,
                             bool                     *aIsReordered,
                             nsIFrame                 **aFirstVisual,
                             nsIFrame                 **aLastVisual) MOZ_OVERRIDE;
   /** Find the next originating cell frame that originates in the row.
     * @param aFrame      - cell frame to start with, will return the next cell
     *                      originating in a row
     * @param aLineNumber - the index of the row relative to the table
     */
   NS_IMETHOD GetNextSiblingOnLine(nsIFrame*& aFrame, int32_t aLineNumber) MOZ_OVERRIDE;
   // row cursor methods to speed up searching for the row(s)
   // containing a point. The basic idea is that we set the cursor
   // property if the rows' y and yMosts are non-decreasing (considering only
   // rows with nonempty overflowAreas --- empty overflowAreas never participate
   // in event handling or painting), and the rowgroup has sufficient number of
   // rows. The cursor property points to a "recently used" row. If we get a
   // series of requests that work on rows "near" the cursor, then we can find
   // those nearby rows quickly by starting our search at the cursor.
   // This code is based on the line cursor code in nsBlockFrame. It's more general
   // though, and could be extracted and used elsewhere.
   struct FrameCursorData {
     nsTArray<nsIFrame*> mFrames;
     uint32_t            mCursorIndex;
     nscoord             mOverflowAbove;
     nscoord             mOverflowBelow;
     FrameCursorData()
       : mFrames(MIN_ROWS_NEEDING_CURSOR), mCursorIndex(0), mOverflowAbove(0),
         mOverflowBelow(0) {}
     bool AppendFrame(nsIFrame* aFrame);
     void FinishBuildingCursor() {
       mFrames.Compact();
     }
   };
   // Clear out row cursor because we're disturbing the rows (e.g., Reflow)
   void ClearRowCursor();
   /**
    * Get the first row that might contain y-coord 'aY', or nullptr if you must search
    * all rows.
    * The actual row returned might not contain 'aY', but if not, it is guaranteed
    * to be before any row which does contain 'aY'.
    * aOverflowAbove is the maximum over all rows of -row.GetOverflowRect().y.
    * To find all rows that intersect the vertical interval aY/aYMost, call
    * GetFirstRowContaining(aY, &overflowAbove), and then iterate through all
    * rows until reaching a row where row->GetRect().y - overflowAbove >= aYMost.
    * That row and all subsequent rows cannot intersect the interval.
    */
   nsIFrame* GetFirstRowContaining(nscoord aY, nscoord* aOverflowAbove);
   /**
    * Set up the row cursor. After this, call AppendFrame for every
    * child frame in sibling order. Ensure that the child frame y and YMost values
    * form non-decreasing sequences (should always be true for table rows);
    * if this is violated, call ClearRowCursor(). If we return nullptr, then we
    * decided not to use a cursor or we already have one set up.
    */
   FrameCursorData* SetupRowCursor();
   virtual nsILineIterator* GetLineIterator() MOZ_OVERRIDE { return this; }
   virtual bool IsFrameOfType(uint32_t aFlags) const MOZ_OVERRIDE
   {
     return nsContainerFrame::IsFrameOfType(aFlags & ~(nsIFrame::eTablePart));
   }
   virtual void InvalidateFrame(uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
   virtual void InvalidateFrameWithRect(const nsRect& aRect, uint32_t aDisplayItemKey = 0) MOZ_OVERRIDE;
   virtual void InvalidateFrameForRemoval() MOZ_OVERRIDE { InvalidateFrameSubtree(); }
 protected:
   nsTableRowGroupFrame(nsStyleContext* aContext);
   void InitChildReflowState(nsPresContext&     aPresContext,
                             bool               aBorderCollapse,
                             nsHTMLReflowState& aReflowState);
   virtual int GetLogicalSkipSides(const nsHTMLReflowState* aReflowState = nullptr) const MOZ_OVERRIDE;
   void PlaceChild(nsPresContext*         aPresContext,
                   nsRowGroupReflowState& aReflowState,
                   nsIFrame*              aKidFrame,
                   nsHTMLReflowMetrics&   aDesiredSize,
                   const nsRect&          aOriginalKidRect,
                   const nsRect&          aOriginalKidVisualOverflow);
   void CalculateRowHeights(nsPresContext*           aPresContext,
                            nsHTMLReflowMetrics&     aDesiredSize,
                            const nsHTMLReflowState& aReflowState);
   void DidResizeRows(nsHTMLReflowMetrics& aDesiredSize);
   void SlideChild(nsRowGroupReflowState& aReflowState,
                   nsIFrame*              aKidFrame);
   /**
    * Reflow the frames we've already created
    *
    * @param   aPresContext presentation context to use
    * @param   aReflowState current inline state
    * @return  true if we successfully reflowed all the mapped children and false
    *            otherwise, e.g. we pushed children to the next in flow
    */
   nsresult ReflowChildren(nsPresContext*         aPresContext,
                           nsHTMLReflowMetrics&   aDesiredSize,
                           nsRowGroupReflowState& aReflowState,
                           nsReflowStatus&        aStatus,
                           bool*                aPageBreakBeforeEnd = nullptr);
   nsresult SplitRowGroup(nsPresContext*           aPresContext,
                          nsHTMLReflowMetrics&     aDesiredSize,
                          const nsHTMLReflowState& aReflowState,
                          nsTableFrame*            aTableFrame,
                          nsReflowStatus&          aStatus,
                          bool                     aRowForcedPageBreak);
   void SplitSpanningCells(nsPresContext&           aPresContext,
                           const nsHTMLReflowState& aReflowState,
                           nsTableFrame&            aTableFrame,
                           nsTableRowFrame&         aFirstRow,
                           nsTableRowFrame&         aLastRow,
                           bool                     aFirstRowIsTopOfPage,
                           nscoord                  aSpanningRowBottom,
                           nsTableRowFrame*&        aContRowFrame,
                           nsTableRowFrame*&        aFirstTruncatedRow,
                           nscoord&                 aDesiredHeight);
   void CreateContinuingRowFrame(nsPresContext& aPresContext,
                                 nsIFrame&      aRowFrame,
                                 nsIFrame**     aContRowFrame);
   bool IsSimpleRowFrame(nsTableFrame* aTableFrame,
                           nsIFrame*     aFrame);
   void GetNextRowSibling(nsIFrame** aRowFrame);
   void UndoContinuedRow(nsPresContext*   aPresContext,
                         nsTableRowFrame* aRow);
 private:
   // border widths in pixels in the collapsing border model
   BCPixelSize mRightContBorderWidth;
   BCPixelSize mBottomContBorderWidth;
   BCPixelSize mLeftContBorderWidth;
 public:
   bool IsRepeatable() const;
   void   SetRepeatable(bool aRepeatable);
   bool HasStyleHeight() const;
   void   SetHasStyleHeight(bool aValue);
   bool HasInternalBreakBefore() const;
   bool HasInternalBreakAfter() const;
 };
 inline bool nsTableRowGroupFrame::IsRepeatable() const
 {
   return (mState & NS_ROWGROUP_REPEATABLE) == NS_ROWGROUP_REPEATABLE;
 }
 inline void nsTableRowGroupFrame::SetRepeatable(bool aRepeatable)
 {
   if (aRepeatable) {
     mState |= NS_ROWGROUP_REPEATABLE;
   } else {
     mState &= ~NS_ROWGROUP_REPEATABLE;
   }
 }
 inline bool nsTableRowGroupFrame::HasStyleHeight() const
 {
   return (mState & NS_ROWGROUP_HAS_STYLE_HEIGHT) == NS_ROWGROUP_HAS_STYLE_HEIGHT;
 }
 inline void nsTableRowGroupFrame::SetHasStyleHeight(bool aValue)
 {
   if (aValue) {
     mState |= NS_ROWGROUP_HAS_STYLE_HEIGHT;
   } else {
     mState &= ~NS_ROWGROUP_HAS_STYLE_HEIGHT;
   }
 }
 inline void
 nsTableRowGroupFrame::GetContinuousBCBorderWidth(nsMargin& aBorder)
 {
   int32_t aPixelsToTwips = nsPresContext::AppUnitsPerCSSPixel();
   aBorder.right = BC_BORDER_LEFT_HALF_COORD(aPixelsToTwips,
                                             mRightContBorderWidth);
   aBorder.bottom = BC_BORDER_TOP_HALF_COORD(aPixelsToTwips,
                                             mBottomContBorderWidth);
   aBorder.left = BC_BORDER_RIGHT_HALF_COORD(aPixelsToTwips,
                                             mLeftContBorderWidth);
   return;
 }
 #endif

The Tor Browser / annotate

layout/tables/nsTableRowGroupFrame.h@44a2da4a2ab2 (annotated)

layout/tables/nsTableRowGroupFrame.h