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 * License.
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 * The Original Code is mozilla.org code.
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#ifndef nsPresContext_h___
#define nsPresContext_h___

#include "nsIPresContext.h"
#include "nsIDeviceContext.h"
#include "nsVoidArray.h"
#include "nsFont.h"
#include "nsCRT.h"
#include "nsCOMPtr.h"
#include "nsIPref.h"
#include "nsICharsetConverterManager.h"
#include "nsILanguageAtomService.h"
#include "nsIURL.h"
#include "nsIObserver.h"
#ifdef IBMBIDI
#include "nsBidiUtils.h"
#endif

#include "nsHashtable.h"
#include "nsIContent.h"
#include "nsITheme.h"
#include "nsWeakReference.h"

// Base class for concrete presentation context classes
class nsPresContext : public nsIPresContext, public nsIObserver {
public:
  NS_DECL_AND_IMPL_ZEROING_OPERATOR_NEW

  // nsISupports methods
  NS_DECL_ISUPPORTS

  // nsIPresContext methods
  NS_IMETHOD Init(nsIDeviceContext* aDeviceContext);
  NS_IMETHOD SetShell(nsIPresShell* aShell);
  virtual void SetCompatibilityMode(nsCompatibility aMode);
  virtual void SetImageAnimationMode(PRUint16 aMode);
  virtual void ClearStyleDataAndReflow();

  virtual nsresult GetXBLBindingURL(nsIContent* aContent, nsIURI** aResult);
  NS_IMETHOD GetMetricsFor(const nsFont& aFont, nsIFontMetrics** aResult);
  NS_IMETHOD AllocateFromShell(size_t aSize, void** aResult);
  NS_IMETHOD FreeToShell(size_t aSize, void* aFreeChunk);
  virtual const nsFont* GetDefaultFont(PRUint8 aFontID) const;
  NS_IMETHOD GetCachedIntPref(PRUint32 aPrefType, PRInt32& aValue);

  virtual nsresult LoadImage(imgIRequest* aImage,
                             nsIFrame* aTargetFrame,
                             imgIRequest **aRequest);

  virtual void StopImagesFor(nsIFrame* aTargetFrame);
  virtual void SetContainer(nsISupports* aContainer);
  virtual already_AddRefed<nsISupports>  GetContainer();
  virtual void GetPageDim(nsRect* aActualRect, nsRect* aAdjRect) = 0;
  virtual void SetPageDim(nsRect* aRect) = 0;
  NS_IMETHOD GetTwipsToPixelsForFonts(float* aResult) const;
  NS_IMETHOD GetScaledPixelsToTwips(float* aScale) const;
  NS_IMETHOD GetLanguageSpecificTransformType(
              nsLanguageSpecificTransformType* aType);

#ifdef MOZ_REFLOW_PERF
  NS_IMETHOD CountReflows(const char * aName, PRUint32 aType, nsIFrame * aFrame);
  NS_IMETHOD PaintCount(const char * aName, nsIRenderingContext* aRenderingContext, nsIFrame * aFrame, PRUint32 aColor);
#endif

  // nsIObserver method
  NS_IMETHOD Observe(nsISupports* aSubject, 
                     const char* aTopic,
                     const PRUnichar* aData);

#ifdef IBMBIDI
  NS_IMETHOD GetBidiEnabled(PRBool* aBidiEnabled) const;
  NS_IMETHOD SetBidiEnabled(PRBool aBidiEnabled) const;
  NS_IMETHOD GetBidiUtils(nsBidiPresUtils** aBidiUtils);
  NS_IMETHOD SetBidi(PRUint32 aSource, PRBool aForceReflow = PR_FALSE);
  NS_IMETHOD GetBidi(PRUint32* aDest) const;
#endif // IBMBIDI

  NS_IMETHOD GetTheme(nsITheme** aResult);
  NS_IMETHOD ThemeChanged();
  NS_IMETHOD SysColorChanged();

protected:
  nsPresContext();
  virtual ~nsPresContext();

  nsCOMPtr<nsIPref>     mPrefs;
  nsCOMPtr<nsILanguageAtomService> mLangService;
  nsLanguageSpecificTransformType mLanguageSpecificTransformType;
  nsWeakPtr             mContainer;

  nsFont                mDefaultVariableFont;
  nsFont                mDefaultFixedFont;
  nsFont                mDefaultSerifFont;
  nsFont                mDefaultSansSerifFont;
  nsFont                mDefaultMonospaceFont;
  nsFont                mDefaultCursiveFont;
  nsFont                mDefaultFantasyFont;
  nscoord               mMinimumFontSize;

  nsSupportsHashtable   mImageLoaders;

#ifdef IBMBIDI
  nsBidiPresUtils*      mBidiUtils;
  PRUint32              mBidi;
  nsCAutoString         mCharset;                 // the charset we are using
#endif // IBMBIDI

#ifdef DEBUG
  PRBool                mInitialized;
#endif

  PRUint16      mImageAnimationModePref;

  nsCOMPtr<nsITheme> mTheme;

protected:
  void   GetUserPreferences();
  void   GetFontPreferences();
  void   GetDocumentColorPreferences();
  void   UpdateCharSet(const char* aCharSet);
  void SetImgAnimations(nsIContent *aParent, PRUint16 aMode);

private:
  static int PR_CALLBACK PrefChangedCallback(const char*, void*);
  void   PreferenceChanged(const char* aPrefName);

  // these are private, use the list in nsFont.h if you want a public list
  enum {
    eDefaultFont_Variable,
    eDefaultFont_Fixed,
    eDefaultFont_Serif,
    eDefaultFont_SansSerif,
    eDefaultFont_Monospace,
    eDefaultFont_Cursive,
    eDefaultFont_Fantasy,
    eDefaultFont_COUNT
  };
};

#endif /* nsPresContext_h___ */
