gecko/layout/generic/nsBulletFrame.h

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 * License.
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 * The Original Code is Mozilla Communicator client code.
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/* rendering object for list-item bullets */

#ifndef nsBulletFrame_h___
#define nsBulletFrame_h___

#include "nsFrame.h"
#include "nsStyleContext.h"

#include "imgIRequest.h"
#include "imgIDecoderObserver.h"
#include "nsStubImageDecoderObserver.h"

#define BULLET_FRAME_IMAGE_LOADING NS_FRAME_STATE_BIT(63)
#define BULLET_FRAME_HAS_FONT_INFLATION NS_FRAME_STATE_BIT(62)

class nsBulletFrame;

class nsBulletListener : public nsStubImageDecoderObserver
{
public:
  nsBulletListener();
  virtual ~nsBulletListener();

  NS_DECL_ISUPPORTS
  // imgIDecoderObserver (override nsStubImageDecoderObserver)
  NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest, bool aCurrentFrame,
                             const nsIntRect *aRect);
  NS_IMETHOD OnStopDecode(imgIRequest *aRequest, nsresult status,
                          const PRUnichar *statusArg);
  NS_IMETHOD OnImageIsAnimated(imgIRequest *aRequest);

  // imgIContainerObserver (override nsStubImageDecoderObserver)
  NS_IMETHOD FrameChanged(imgIRequest *aRequest,
                          imgIContainer *aContainer,
                          const nsIntRect *dirtyRect);

  void SetFrame(nsBulletFrame *frame) { mFrame = frame; }

private:
  nsBulletFrame *mFrame;
};

/**
 * A simple class that manages the layout and rendering of html bullets.
 * This class also supports the CSS list-style properties.
 */
class nsBulletFrame : public nsFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  nsBulletFrame(nsStyleContext* aContext)
    : nsFrame(aContext)
  {
  }
  virtual ~nsBulletFrame();

  // nsIFrame
  virtual void DestroyFrom(nsIFrame* aDestructRoot);
  NS_IMETHOD BuildDisplayList(nsDisplayListBuilder*   aBuilder,
                              const nsRect&           aDirtyRect,
                              const nsDisplayListSet& aLists);
  virtual nsIAtom* GetType() const;
  virtual void DidSetStyleContext(nsStyleContext* aOldStyleContext);
#ifdef NS_DEBUG
  NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif

  // nsIHTMLReflow
  NS_IMETHOD Reflow(nsPresContext* aPresContext,
                    nsHTMLReflowMetrics& aMetrics,
                    const nsHTMLReflowState& aReflowState,
                    nsReflowStatus& aStatus);
  virtual nscoord GetMinWidth(nsRenderingContext *aRenderingContext);
  virtual nscoord GetPrefWidth(nsRenderingContext *aRenderingContext);

  // nsBulletFrame
  PRInt32 SetListItemOrdinal(PRInt32 aNextOrdinal, bool* aChanged);


  NS_IMETHOD OnStartContainer(imgIRequest *aRequest, imgIContainer *aImage);
  NS_IMETHOD OnDataAvailable(imgIRequest *aRequest,
                             bool aCurrentFrame,
                             const nsIntRect *aRect);
  NS_IMETHOD OnStopDecode(imgIRequest *aRequest,
                          nsresult aStatus,
                          const PRUnichar *aStatusArg);
  NS_IMETHOD OnImageIsAnimated(imgIRequest *aRequest);
  NS_IMETHOD FrameChanged(imgIRequest *aRequest,
                          imgIContainer *aContainer,
                          const nsIntRect *aDirtyRect);

  /* get list item text, without '.' */
  static bool AppendCounterText(PRInt32 aListStyleType,
                                  PRInt32 aOrdinal,
                                  nsString& aResult);

  /* get list item text, with '.' */
  bool GetListItemText(const nsStyleList& aStyleList,
                         nsString& aResult);
                         
  void PaintBullet(nsRenderingContext& aRenderingContext, nsPoint aPt,
                   const nsRect& aDirtyRect);
  
  virtual bool IsEmpty();
  virtual bool IsSelfEmpty();
  virtual nscoord GetBaseline() const;

  float GetFontSizeInflation() const;
  bool HasFontSizeInflation() const {
    return (GetStateBits() & BULLET_FRAME_HAS_FONT_INFLATION) != 0;
  }
  void SetFontSizeInflation(float aInflation);

protected:
  void GetDesiredSize(nsPresContext* aPresContext,
                      nsRenderingContext *aRenderingContext,
                      nsHTMLReflowMetrics& aMetrics,
                      float aFontSizeInflation);

  void GetLoadGroup(nsPresContext *aPresContext, nsILoadGroup **aLoadGroup);

  nsMargin mPadding;
  nsCOMPtr<imgIRequest> mImageRequest;
  nsRefPtr<nsBulletListener> mListener;

  nsSize mIntrinsicSize;
  nsSize mComputedSize;
  PRInt32 mOrdinal;
  bool mTextIsRTL;

private:

  // This is a boolean flag indicating whether or not the current image request
  // has been registered with the refresh driver.
  bool mRequestRegistered;
};

#endif /* nsBulletFrame_h___ */