pjs/layout/generic/nsContainerFrame.h

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/* base class #1 for rendering objects that have child lists */

#ifndef nsContainerFrame_h___
#define nsContainerFrame_h___

#include "nsSplittableFrame.h"
#include "nsFrameList.h"
#include "nsLayoutUtils.h"

// Option flags for ReflowChild() and FinishReflowChild()
// member functions
#define NS_FRAME_NO_MOVE_VIEW         0x0001
#define NS_FRAME_NO_MOVE_FRAME        (0x0002 | NS_FRAME_NO_MOVE_VIEW)
#define NS_FRAME_NO_SIZE_VIEW         0x0004
#define NS_FRAME_NO_VISIBILITY        0x0008

/**
 * Implementation of a container frame.
 */
class nsContainerFrame : public nsSplittableFrame
{
public:
  // nsIFrame overrides
  NS_IMETHOD Init(nsIContent* aContent,
                  nsIFrame*   aParent,
                  nsIFrame*   aPrevInFlow);
  NS_IMETHOD SetInitialChildList(nsIAtom*  aListName,
                                 nsIFrame* aChildList);
  NS_IMETHOD AppendFrames(nsIAtom*  aListName,
                          nsIFrame* aFrameList);
  NS_IMETHOD InsertFrames(nsIAtom*  aListName,
                          nsIFrame* aPrevFrame,
                          nsIFrame* aFrameList);
  NS_IMETHOD RemoveFrame(nsIAtom*  aListName,
                         nsIFrame* aOldFrame);

  virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
  virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
  virtual void Destroy();
  virtual void ChildIsDirty(nsIFrame* aChild);

  virtual PRBool IsLeaf() const;
  virtual PRBool PeekOffsetNoAmount(PRBool aForward, PRInt32* aOffset);
  virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
  
#ifdef DEBUG
  NS_IMETHOD List(FILE* out, PRInt32 aIndent) const;
#endif  

  // nsContainerFrame methods
  virtual void DeleteNextInFlowChild(nsPresContext* aPresContext,
                                     nsIFrame*       aNextInFlow);

  static PRInt32 LengthOf(nsIFrame* aFrameList) {
    nsFrameList tmp(aFrameList);
    return tmp.GetLength();
  }

  // Positions the frame's view based on the frame's origin
  static void PositionFrameView(nsIFrame* aKidFrame);

  // Set the view's size and position after its frame has been reflowed.
  //
  // Flags:
  // NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
  //    don't want to automatically sync the frame and view
  // NS_FRAME_NO_SIZE_VIEW - don't size the view
  static void SyncFrameViewAfterReflow(nsPresContext* aPresContext,
                                       nsIFrame*       aFrame,
                                       nsIView*        aView,
                                       const nsRect*   aCombinedArea,
                                       PRUint32        aFlags = 0);
  
  // Sets the view's attributes from the frame style.
  // - opacity
  // - visibility
  // - content transparency
  // - clip
  // Call this when one of these styles changes or when the view has just
  // been created.
  // @param aStyleContext can be null, in which case the frame's style context is used
  static void SyncFrameViewProperties(nsPresContext*  aPresContext,
                                      nsIFrame*        aFrame,
                                      nsStyleContext*  aStyleContext,
                                      nsIView*         aView,
                                      PRUint32         aFlags = 0);

  // Returns PR_TRUE if the frame requires a view
  static PRBool FrameNeedsView(nsIFrame* aFrame);
  
  // Used by both nsInlineFrame and nsFirstLetterFrame.
  void DoInlineIntrinsicWidth(nsIRenderingContext *aRenderingContext,
                              InlineIntrinsicWidthData *aData,
                              nsLayoutUtils::IntrinsicWidthType aType);

  /**
   * This is the CSS block concept of computing 'auto' widths, which most
   * classes derived from nsContainerFrame want.
   */
  virtual nsSize ComputeAutoSize(nsIRenderingContext *aRenderingContext,
                                 nsSize aCBSize, nscoord aAvailableWidth,
                                 nsSize aMargin, nsSize aBorder,
                                 nsSize aPadding, PRBool aShrinkWrap);

  /**
   * Invokes the WillReflow() function, positions the frame and its view (if
   * requested), and then calls Reflow(). If the reflow succeeds and the child
   * frame is complete, deletes any next-in-flows using DeleteNextInFlowChild()
   *
   * Flags:
   * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
   *    don't want to automatically sync the frame and view
   * NS_FRAME_NO_MOVE_VIEW - don't move the frame. aX and aY are ignored in this
   *    case. Also implies NS_FRAME_NO_MOVE_VIEW
   */
  nsresult ReflowChild(nsIFrame*                aKidFrame,
                       nsPresContext*          aPresContext,
                       nsHTMLReflowMetrics&     aDesiredSize,
                       const nsHTMLReflowState& aReflowState,
                       nscoord                  aX,
                       nscoord                  aY,
                       PRUint32                 aFlags,
                       nsReflowStatus&          aStatus);

  /**
   * The second half of frame reflow. Does the following:
   * - sets the frame's bounds
   * - sizes and positions (if requested) the frame's view. If the frame's final
   *   position differs from the current position and the frame itself does not
   *   have a view, then any child frames with views are positioned so they stay
   *   in sync
   * - sets the view's visibility, opacity, content transparency, and clip
   * - invoked the DidReflow() function
   *
   * Flags:
   * NS_FRAME_NO_MOVE_FRAME - don't move the frame. aX and aY are ignored in this
   *    case. Also implies NS_FRAME_NO_MOVE_VIEW
   * NS_FRAME_NO_MOVE_VIEW - don't position the frame's view. Set this if you
   *    don't want to automatically sync the frame and view
   * NS_FRAME_NO_SIZE_VIEW - don't size the frame's view
   */
  static nsresult FinishReflowChild(nsIFrame*                 aKidFrame,
                                    nsPresContext*           aPresContext,
                                    const nsHTMLReflowState*  aReflowState,
                                    nsHTMLReflowMetrics&      aDesiredSize,
                                    nscoord                   aX,
                                    nscoord                   aY,
                                    PRUint32                  aFlags);

  
  static void PositionChildViews(nsIFrame* aFrame);
  
  /**
   * Builds display lists for the children. The background
   * of each child is placed in the Content() list (suitable for inline
   * children and other elements that behave like inlines,
   * but not for in-flow block children of blocks).  DOES NOT
   * paint the background/borders/outline of this frame. This should
   * probably be avoided and eventually removed. It's currently here
   * to emulate what nsContainerFrame::Paint did.
   */
  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);

protected:
  nsContainerFrame(nsStyleContext* aContext) : nsSplittableFrame(aContext) {}
  ~nsContainerFrame();

  /**
   * Builds a display list for non-block children that behave like
   * inlines. This puts the background of each child into the
   * Content() list (suitable for inline children but not for
   * in-flow block children of blocks).
   * @param aForcePseudoStack forces each child into a pseudo-stacking-context
   * so its background and all other display items (except for positioned
   * display items) go into the Content() list.
   */
  nsresult BuildDisplayListForNonBlockChildren(nsDisplayListBuilder*   aBuilder,
                                               const nsRect&           aDirtyRect,
                                               const nsDisplayListSet& aLists,
                                               PRUint32                aFlags = 0);

  /**
   * Get the frames on the overflow list
   */
  nsIFrame* GetOverflowFrames(nsPresContext* aPresContext,
                              PRBool          aRemoveProperty) const;

  /**
   * Set the overflow list
   */
  nsresult SetOverflowFrames(nsPresContext* aPresContext,
                             nsIFrame*       aOverflowFrames);

  /**
   * Moves any frames on both the prev-in-flow's overflow list and the
   * receiver's overflow to the receiver's child list.
   *
   * Resets the overlist pointers to nsnull, and updates the receiver's child
   * count and content mapping.
   *
   * @return PR_TRUE if any frames were moved and PR_FALSE otherwise
   */
  PRBool MoveOverflowToChildList(nsPresContext* aPresContext);

  /**
   * Push aFromChild and its next siblings to the next-in-flow. Change
   * the geometric parent of each frame that's pushed. If there is no
   * next-in-flow the frames are placed on the overflow list (and the
   * geometric parent is left unchanged).
   *
   * Updates the next-in-flow's child count. Does <b>not</b> update the
   * pusher's child count.
   *
   * @param   aFromChild the first child frame to push. It is disconnected from
   *            aPrevSibling
   * @param   aPrevSibling aFromChild's previous sibling. Must not be null.
   *            It's an error to push a parent's first child frame
   */
  void PushChildren(nsPresContext* aPresContext,
                    nsIFrame*       aFromChild,
                    nsIFrame*       aPrevSibling);

  /**
   * A helper for frames corresponding to generated content, which is used to
   * remove the generated content from the tree when the :before or :after
   * frame is destroyed.
   */
  static void CleanupGeneratedContentIn(nsIContent* aRealContent,
                                        nsIFrame* aRoot);

  nsFrameList mFrames;
};

#endif /* nsContainerFrame_h___ */