gecko-dev/layout/generic/nsInlineFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The Original Code is Mozilla Communicator client code.
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#ifndef nsInlineFrame_h___
#define nsInlineFrame_h___

#include "nsHTMLContainerFrame.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsLineLayout.h"
#include "nsLayoutAtoms.h"

class nsAnonymousBlockFrame;

#define NS_INLINE_FRAME_CID \
 { 0xa6cf90e0, 0x15b3, 0x11d2,{0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32}}

#define nsInlineFrameSuper nsHTMLContainerFrame

#define NS_INLINE_FRAME_CONTAINS_PERCENT_AWARE_CHILD 0x00100000

// NS_INLINE_FRAME_HARD_TEXT_OFFSETS is used for access keys, where what
// would normally be 1 text frame is split into 3 sets of an inline parent 
// and text child (the pre access key text, the underlined key text, and
// the post access key text). The offsets of the 3 text frame children
// are set in nsCSSFrameConstructor

#define NS_INLINE_FRAME_HARD_TEXT_OFFSETS            0x00200000

/**
 * Inline frame class.
 *
 * This class manages a list of child frames that are inline frames. Working with
 * nsLineLayout, the class will reflow and place inline frames on a line.
 */
class nsInlineFrame : public nsInlineFrameSuper
{
public:
  friend nsresult NS_NewInlineFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);

  // nsISupports overrides
  NS_IMETHOD QueryInterface(const nsIID& aIID, void** aInstancePtr);

  // nsIFrame overrides
  NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aFrameList);
  NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aPrevFrame,
                          nsIFrame* aFrameList);
  NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
                         nsIPresShell& aPresShell,
                         nsIAtom* aListName,
                         nsIFrame* aOldFrame);
  NS_IMETHOD ReplaceFrame(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aOldFrame,
                          nsIFrame* aNewFrame);
  NS_IMETHOD Paint(nsIPresContext*      aPresContext,
                   nsIRenderingContext& aRenderingContext,
                   const nsRect&        aDirtyRect,
                   nsFramePaintLayer    aWhichLayer,
                   PRUint32             aFlags = 0);
  NS_IMETHOD ReflowDirtyChild(nsIPresShell* aPresShell, nsIFrame* aChild);

#ifdef ACCESSIBILITY
  NS_IMETHODIMP GetAccessible(nsIAccessible** aAccessible);
#endif

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
  virtual nsIAtom* GetType() const;

  virtual PRBool IsEmpty();

  // nsIHTMLReflow overrides
  NS_IMETHOD Reflow(nsIPresContext* aPresContext,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus);

  NS_IMETHOD CanContinueTextRun(PRBool& aContinueTextRun) const;

  // Take all of the frames away from this frame. The caller is
  // presumed to keep them alive.
  void StealAllFrames() {
    mFrames.SetFrames(nsnull);
  }

protected:
  // Additional reflow state used during our reflow methods
  struct InlineReflowState {
    nsIFrame* mPrevFrame;
    nsInlineFrame* mNextInFlow;
    PRPackedBool mSetParentPointer;  // when reflowing child frame first set its
                                     // parent frame pointer

    InlineReflowState()  {
      mPrevFrame = nsnull;
      mNextInFlow = nsnull;
      mSetParentPointer = PR_FALSE;
    };
  };

  nsInlineFrame();

  virtual PRIntn GetSkipSides() const;

  nsresult ReflowFrames(nsIPresContext* aPresContext,
                        const nsHTMLReflowState& aReflowState,
                        InlineReflowState& rs,
                        nsHTMLReflowMetrics& aMetrics,
                        nsReflowStatus& aStatus);

  nsresult ReflowInlineFrame(nsIPresContext* aPresContext,
                             const nsHTMLReflowState& aReflowState,
                             InlineReflowState& rs,
                             nsIFrame* aFrame,
                             nsReflowStatus& aStatus);

  virtual nsIFrame* PullOneFrame(nsIPresContext* aPresContext,
                                 InlineReflowState& rs,
                                 PRBool* aIsComplete);

  virtual void PushFrames(nsIPresContext* aPresContext,
                          nsIFrame* aFromChild,
                          nsIFrame* aPrevSibling);

};

//----------------------------------------------------------------------

/**
 * Variation on inline-frame used to manage lines for line layout in
 * special situations (:first-line style in particular).
 */
class nsFirstLineFrame : public nsInlineFrame {
public:
  friend nsresult NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsIFrame** aNewFrame);

#ifdef DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
  virtual nsIAtom* GetType() const;
  NS_IMETHOD Reflow(nsIPresContext* aPresContext,
                    nsHTMLReflowMetrics& aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus);

  // Take frames starting at aFrame until the end of the frame-list
  // away from this frame. The caller is presumed to keep them alive.
  void StealFramesFrom(nsIFrame* aFrame);

protected:
  nsFirstLineFrame();

  virtual nsIFrame* PullOneFrame(nsIPresContext* aPresContext,
                                 InlineReflowState& rs,
                                 PRBool* aIsComplete);
};

//----------------------------------------------------------------------

// Derived class created for relatively positioned inline-level elements
// that acts as a containing block for child absolutely positioned
// elements

class nsPositionedInlineFrame : public nsInlineFrame
{
public:
  nsPositionedInlineFrame() { }          // useful for debugging

  virtual ~nsPositionedInlineFrame() { } // useful for debugging

  NS_IMETHOD Destroy(nsIPresContext* aPresContext);

  NS_IMETHOD SetInitialChildList(nsIPresContext* aPresContext,
                                 nsIAtom*        aListName,
                                 nsIFrame*       aChildList);
  NS_IMETHOD AppendFrames(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aFrameList);
  NS_IMETHOD InsertFrames(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aPrevFrame,
                          nsIFrame* aFrameList);
  NS_IMETHOD RemoveFrame(nsIPresContext* aPresContext,
                         nsIPresShell& aPresShell,
                         nsIAtom* aListName,
                         nsIFrame* aOldFrame);
  NS_IMETHOD ReplaceFrame(nsIPresContext* aPresContext,
                          nsIPresShell& aPresShell,
                          nsIAtom* aListName,
                          nsIFrame* aOldFrame,
                          nsIFrame* aNewFrame);

  NS_IMETHOD GetAdditionalChildListName(PRInt32   aIndex,
                                        nsIAtom** aListName) const;

  NS_IMETHOD FirstChild(nsIPresContext* aPresContext,
                        nsIAtom*        aListName,
                        nsIFrame**      aFirstChild) const;

  NS_IMETHOD Reflow(nsIPresContext*          aPresContext,
                    nsHTMLReflowMetrics&     aDesiredSize,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus&          aStatus);
  
  virtual nsIAtom* GetType() const;

protected:
  nsAbsoluteContainingBlock mAbsoluteContainer;
};

#endif /* nsInlineFrame_h___ */