nsStyleContext Class Reference

An nsStyleContext represents the computed style data for an element. More...

#include <nsStyleContext.h>

Collaboration diagram for nsStyleContext:

List of all members.

Classes
struct	AllocationHeader
Public Member Functions
	nsStyleContext (nsStyleContext *aParent, nsIAtom *aPseudoTag, nsCSSPseudoElements::Type aPseudoType, nsRuleNode *aRuleNode, nsPresContext *aPresContext)
	~nsStyleContext ()
void *	operator new (size_t sz, nsPresContext *aPresContext) throw ()
void	Destroy ()
nsrefcnt	AddRef ()
nsrefcnt	Release ()
nsPresContext *	PresContext () const
nsStyleContext *	GetParent () const
nsIAtom *	GetPseudo () const
nsCSSPseudoElements::Type	GetPseudoType () const
already_AddRefed< nsStyleContext >	FindChildWithRules (const nsIAtom *aPseudoTag, nsRuleNode *aRules, nsRuleNode *aRulesIfVisited, PRBool aRelevantLinkVisited)
PRBool	HasTextDecorations () const
PRBool	HasPseudoElementData () const
PRBool	RelevantLinkVisited () const
PRBool	IsLinkContext () const
PRBool	IsStyleIfVisited () const
void	SetIsStyleIfVisited ()
nsStyleContext *	GetStyleIfVisited () const
void	SetStyleIfVisited (already_AddRefed< nsStyleContext > aStyleIfVisited)
void	SetStyle (nsStyleStructID aSID, void *aStruct)
void	SetStyleFont (nsStyleFont *aStruct)
void	SetStyleColor (nsStyleColor *aStruct)
void	SetStyleList (nsStyleList *aStruct)
void	SetStyleText (nsStyleText *aStruct)
void	SetStyleVisibility (nsStyleVisibility *aStruct)
void	SetStyleQuotes (nsStyleQuotes *aStruct)
void	SetStyleUserInterface (nsStyleUserInterface *aStruct)
void	SetStyleTableBorder (nsStyleTableBorder *aStruct)
void	SetStyleSVG (nsStyleSVG *aStruct)
nsRuleNode *	GetRuleNode ()
void	AddStyleBit (const PRUint32 &aBit)
void	Mark ()
const void *	GetStyleData (nsStyleStructID aSID)
const nsStyleFont *	GetStyleFont ()
const nsStyleColor *	GetStyleColor ()
const nsStyleBackground *	GetStyleBackground ()
const nsStyleList *	GetStyleList ()
const nsStylePosition *	GetStylePosition ()
const nsStyleText *	GetStyleText ()
const nsStyleTextReset *	GetStyleTextReset ()
const nsStyleDisplay *	GetStyleDisplay ()
const nsStyleVisibility *	GetStyleVisibility ()
const nsStyleContent *	GetStyleContent ()
const nsStyleQuotes *	GetStyleQuotes ()
const nsStyleUserInterface *	GetStyleUserInterface ()
const nsStyleUIReset *	GetStyleUIReset ()
const nsStyleTable *	GetStyleTable ()
const nsStyleTableBorder *	GetStyleTableBorder ()
const nsStyleMargin *	GetStyleMargin ()
const nsStylePadding *	GetStylePadding ()
const nsStyleBorder *	GetStyleBorder ()
const nsStyleOutline *	GetStyleOutline ()
const nsStyleXUL *	GetStyleXUL ()
const nsStyleSVG *	GetStyleSVG ()
const nsStyleSVGReset *	GetStyleSVGReset ()
const nsStyleColumn *	GetStyleColumn ()
const nsStyleFont *	PeekStyleFont ()
const nsStyleColor *	PeekStyleColor ()
const nsStyleBackground *	PeekStyleBackground ()
const nsStyleList *	PeekStyleList ()
const nsStylePosition *	PeekStylePosition ()
const nsStyleText *	PeekStyleText ()
const nsStyleTextReset *	PeekStyleTextReset ()
const nsStyleDisplay *	PeekStyleDisplay ()
const nsStyleVisibility *	PeekStyleVisibility ()
const nsStyleContent *	PeekStyleContent ()
const nsStyleQuotes *	PeekStyleQuotes ()
const nsStyleUserInterface *	PeekStyleUserInterface ()
const nsStyleUIReset *	PeekStyleUIReset ()
const nsStyleTable *	PeekStyleTable ()
const nsStyleTableBorder *	PeekStyleTableBorder ()
const nsStyleMargin *	PeekStyleMargin ()
const nsStylePadding *	PeekStylePadding ()
const nsStyleBorder *	PeekStyleBorder ()
const nsStyleOutline *	PeekStyleOutline ()
const nsStyleXUL *	PeekStyleXUL ()
const nsStyleSVG *	PeekStyleSVG ()
const nsStyleSVGReset *	PeekStyleSVGReset ()
const nsStyleColumn *	PeekStyleColumn ()
void *	GetUniqueStyleData (const nsStyleStructID &aSID)
nsChangeHint	CalcStyleDifference (nsStyleContext *aOther)
nscolor	GetVisitedDependentColor (nsCSSProperty aProperty)
	Get a color that depends on link-visitedness using this and this->GetStyleIfVisited().
void *	Alloc (size_t aSize)
	Allocate a chunk of memory that is scoped to the lifetime of this style context, i.e., memory that will automatically be freed when this style context is destroyed.
Static Public Member Functions
static nscolor	CombineVisitedColors (nscolor *aColors, PRBool aLinkIsVisited)
	aColors should be a two element array of nscolor in which the first color is the unvisited color and the second is the visited color.
Protected Member Functions
void	AddChild (nsStyleContext *aChild)
void	RemoveChild (nsStyleContext *aChild)
void	ApplyStyleFixups (nsPresContext *aPresContext)
void	FreeAllocations (nsPresContext *aPresContext)
const void *	GetCachedStyleData (nsStyleStructID aSID)
const nsStyleFont *	DoGetStyleFont (PRBool aComputeData)
const nsStyleColor *	DoGetStyleColor (PRBool aComputeData)
const nsStyleBackground *	DoGetStyleBackground (PRBool aComputeData)
const nsStyleList *	DoGetStyleList (PRBool aComputeData)
const nsStylePosition *	DoGetStylePosition (PRBool aComputeData)
const nsStyleText *	DoGetStyleText (PRBool aComputeData)
const nsStyleTextReset *	DoGetStyleTextReset (PRBool aComputeData)
const nsStyleDisplay *	DoGetStyleDisplay (PRBool aComputeData)
const nsStyleVisibility *	DoGetStyleVisibility (PRBool aComputeData)
const nsStyleContent *	DoGetStyleContent (PRBool aComputeData)
const nsStyleQuotes *	DoGetStyleQuotes (PRBool aComputeData)
const nsStyleUserInterface *	DoGetStyleUserInterface (PRBool aComputeData)
const nsStyleUIReset *	DoGetStyleUIReset (PRBool aComputeData)
const nsStyleTable *	DoGetStyleTable (PRBool aComputeData)
const nsStyleTableBorder *	DoGetStyleTableBorder (PRBool aComputeData)
const nsStyleMargin *	DoGetStyleMargin (PRBool aComputeData)
const nsStylePadding *	DoGetStylePadding (PRBool aComputeData)
const nsStyleBorder *	DoGetStyleBorder (PRBool aComputeData)
const nsStyleOutline *	DoGetStyleOutline (PRBool aComputeData)
const nsStyleXUL *	DoGetStyleXUL (PRBool aComputeData)
const nsStyleSVG *	DoGetStyleSVG (PRBool aComputeData)
const nsStyleSVGReset *	DoGetStyleSVGReset (PRBool aComputeData)
const nsStyleColumn *	DoGetStyleColumn (PRBool aComputeData)
Protected Attributes
nsStyleContext *const	mParent
nsStyleContext *	mChild
nsStyleContext *	mEmptyChild
nsStyleContext *	mPrevSibling
nsStyleContext *	mNextSibling
nsRefPtr< nsStyleContext >	mStyleIfVisited
nsCOMPtr< nsIAtom >	mPseudoTag
nsRuleNode *const	mRuleNode
AllocationHeader *	mAllocations
nsResetStyleData *	mCachedResetData
nsInheritedStyleData	mCachedInheritedData
PRUint32	mBits
PRUint32	mRefCnt

---

Detailed Description

An nsStyleContext represents the computed style data for an element.

The computed style data are stored in a set of structs (see nsStyleStruct.h) that are cached either on the style context or in the rule tree (see nsRuleNode.h for a description of this caching and how the cached structs are shared).

Since the data in |nsIStyleRule|s and |nsRuleNode|s are immutable (with a few exceptions, like system color changes), the data in an nsStyleContext are also immutable (with the additional exception of GetUniqueStyleData). When style data change, nsFrameManager::ReResolveStyleContext creates a new style context.

Style contexts are reference counted. References are generally held by: 1. the |nsIFrame|s that are using the style context and 2. any *child* style contexts (this might be the reverse of expectation, but it makes sense in this case) Style contexts participate in the mark phase of rule node garbage collection.

---

Constructor & Destructor Documentation

nsStyleContext::nsStyleContext	(	nsStyleContext *	aParent,
		nsIAtom *	aPseudoTag,
		nsCSSPseudoElements::Type	aPseudoType,
		nsRuleNode *	aRuleNode,
		nsPresContext *	aPresContext
	)

nsStyleContext::~nsStyleContext

(

)

---

Member Function Documentation

void nsStyleContext::AddChild

(

nsStyleContext *

aChild

)

[protected]

nsrefcnt nsStyleContext::AddRef

(

void

)

[inline]

void nsStyleContext::AddStyleBit

(

const PRUint32 &

aBit

)

[inline]

void* nsStyleContext::Alloc

(

size_t

aSize

)

Allocate a chunk of memory that is scoped to the lifetime of this style context, i.e., memory that will automatically be freed when this style context is destroyed.

This is intended for allocations that are stored on this style context or its style structs. (Use on style structs is fine since any style context to which this context's style structs are shared will be a descendant of this style context and thus keep it alive.)

This currently allocates the memory out of the pres shell arena.

It would be relatively straightforward to write a Free method for the underlying implementation, but we don't need it (or the overhead of making a doubly-linked list or other structure to support it).

WARNING: Memory allocated using this method cannot be stored in the rule tree, since rule nodes may outlive the style context.

void nsStyleContext::ApplyStyleFixups

(

nsPresContext *

aPresContext

)

[protected]

nsChangeHint nsStyleContext::CalcStyleDifference

(

nsStyleContext *

aOther

)

static nscolor nsStyleContext::CombineVisitedColors	(	nscolor *	aColors,
		PRBool	aLinkIsVisited
	)			[static]

aColors should be a two element array of nscolor in which the first color is the unvisited color and the second is the visited color.

Combine the R, G, and B components of whichever of aColors should be used based on aLinkIsVisited with the A component of aColors[0].

void nsStyleContext::Destroy

(

)

const nsStyleBackground* nsStyleContext::DoGetStyleBackground

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleBorder* nsStyleContext::DoGetStyleBorder

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleColor* nsStyleContext::DoGetStyleColor

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleColumn* nsStyleContext::DoGetStyleColumn

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleContent* nsStyleContext::DoGetStyleContent

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleDisplay* nsStyleContext::DoGetStyleDisplay

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleFont* nsStyleContext::DoGetStyleFont

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleList* nsStyleContext::DoGetStyleList

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleMargin* nsStyleContext::DoGetStyleMargin

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleOutline* nsStyleContext::DoGetStyleOutline

(

PRBool

aComputeData

)

[inline, protected]

const nsStylePadding* nsStyleContext::DoGetStylePadding

(

PRBool

aComputeData

)

[inline, protected]

const nsStylePosition* nsStyleContext::DoGetStylePosition

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleQuotes* nsStyleContext::DoGetStyleQuotes

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleSVG* nsStyleContext::DoGetStyleSVG

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleSVGReset* nsStyleContext::DoGetStyleSVGReset

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleTable* nsStyleContext::DoGetStyleTable

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleTableBorder* nsStyleContext::DoGetStyleTableBorder

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleText* nsStyleContext::DoGetStyleText

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleTextReset* nsStyleContext::DoGetStyleTextReset

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleUIReset* nsStyleContext::DoGetStyleUIReset

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleUserInterface* nsStyleContext::DoGetStyleUserInterface

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleVisibility* nsStyleContext::DoGetStyleVisibility

(

PRBool

aComputeData

)

[inline, protected]

const nsStyleXUL* nsStyleContext::DoGetStyleXUL

(

PRBool

aComputeData

)

[inline, protected]

already_AddRefed<nsStyleContext> nsStyleContext::FindChildWithRules	(	const nsIAtom *	aPseudoTag,
		nsRuleNode *	aRules,
		nsRuleNode *	aRulesIfVisited,
		PRBool	aRelevantLinkVisited
	)

void nsStyleContext::FreeAllocations

(

nsPresContext *

aPresContext

)

[protected]

const void* nsStyleContext::GetCachedStyleData

(

nsStyleStructID

aSID

)

[inline, protected]

nsStyleContext* nsStyleContext::GetParent

(

)

const [inline]

nsIAtom* nsStyleContext::GetPseudo

(

)

const [inline]

nsCSSPseudoElements::Type nsStyleContext::GetPseudoType

(

)

const [inline]

nsRuleNode* nsStyleContext::GetRuleNode

(

)

[inline]

const nsStyleBackground* nsStyleContext::GetStyleBackground

(

)

[inline]

const nsStyleBorder* nsStyleContext::GetStyleBorder

(

)

[inline]

const nsStyleColor* nsStyleContext::GetStyleColor

(

)

[inline]

const nsStyleColumn* nsStyleContext::GetStyleColumn

(

)

[inline]

const nsStyleContent* nsStyleContext::GetStyleContent

(

)

[inline]

const void* nsStyleContext::GetStyleData

(

nsStyleStructID

aSID

)

const nsStyleDisplay* nsStyleContext::GetStyleDisplay

(

)

[inline]

const nsStyleFont* nsStyleContext::GetStyleFont

(

)

[inline]

nsStyleContext* nsStyleContext::GetStyleIfVisited

(

)

const [inline]

const nsStyleList* nsStyleContext::GetStyleList

(

)

[inline]

const nsStyleMargin* nsStyleContext::GetStyleMargin

(

)

[inline]

const nsStyleOutline* nsStyleContext::GetStyleOutline

(

)

[inline]

const nsStylePadding* nsStyleContext::GetStylePadding

(

)

[inline]

const nsStylePosition* nsStyleContext::GetStylePosition

(

)

[inline]

const nsStyleQuotes* nsStyleContext::GetStyleQuotes

(

)

[inline]

const nsStyleSVG* nsStyleContext::GetStyleSVG

(

)

[inline]

const nsStyleSVGReset* nsStyleContext::GetStyleSVGReset

(

)

[inline]

const nsStyleTable* nsStyleContext::GetStyleTable

(

)

[inline]

const nsStyleTableBorder* nsStyleContext::GetStyleTableBorder

(

)

[inline]

const nsStyleText* nsStyleContext::GetStyleText

(

)

[inline]

const nsStyleTextReset* nsStyleContext::GetStyleTextReset

(

)

[inline]

const nsStyleUIReset* nsStyleContext::GetStyleUIReset

(

)

[inline]

const nsStyleUserInterface* nsStyleContext::GetStyleUserInterface

(

)

[inline]

const nsStyleVisibility* nsStyleContext::GetStyleVisibility

(

)

[inline]

const nsStyleXUL* nsStyleContext::GetStyleXUL

(

)

[inline]

void* nsStyleContext::GetUniqueStyleData

(

const nsStyleStructID &

aSID

)

nscolor nsStyleContext::GetVisitedDependentColor

(

nsCSSProperty

aProperty

)

Get a color that depends on link-visitedness using this and this->GetStyleIfVisited().

aProperty must be a color-valued property that nsStyleAnimation knows how to extract. It must also be a property that we know to do change handling for in nsStyleContext::CalcDifference.

Note that if aProperty is eCSSProperty_border_*_color, this function handles -moz-use-text-color.

PRBool nsStyleContext::HasPseudoElementData

(

)

const [inline]

PRBool nsStyleContext::HasTextDecorations

(

)

const [inline]

PRBool nsStyleContext::IsLinkContext

(

)

const [inline]

PRBool nsStyleContext::IsStyleIfVisited

(

)

const [inline]

void nsStyleContext::Mark

(

)

void* nsStyleContext::operator new	(	size_t	sz,
		nsPresContext *	aPresContext
	)			throw ()

const nsStyleBackground* nsStyleContext::PeekStyleBackground

(

)

[inline]

const nsStyleBorder* nsStyleContext::PeekStyleBorder

(

)

[inline]

const nsStyleColor* nsStyleContext::PeekStyleColor

(

)

[inline]

const nsStyleColumn* nsStyleContext::PeekStyleColumn

(

)

[inline]

const nsStyleContent* nsStyleContext::PeekStyleContent

(

)

[inline]

const nsStyleDisplay* nsStyleContext::PeekStyleDisplay

(

)

[inline]

const nsStyleFont* nsStyleContext::PeekStyleFont

(

)

[inline]

const nsStyleList* nsStyleContext::PeekStyleList

(

)

[inline]

const nsStyleMargin* nsStyleContext::PeekStyleMargin

(

)

[inline]

const nsStyleOutline* nsStyleContext::PeekStyleOutline

(

)

[inline]

const nsStylePadding* nsStyleContext::PeekStylePadding

(

)

[inline]

const nsStylePosition* nsStyleContext::PeekStylePosition

(

)

[inline]

const nsStyleQuotes* nsStyleContext::PeekStyleQuotes

(

)

[inline]

const nsStyleSVG* nsStyleContext::PeekStyleSVG

(

)

[inline]

const nsStyleSVGReset* nsStyleContext::PeekStyleSVGReset

(

)

[inline]

const nsStyleTable* nsStyleContext::PeekStyleTable

(

)

[inline]

const nsStyleTableBorder* nsStyleContext::PeekStyleTableBorder

(

)

[inline]

const nsStyleText* nsStyleContext::PeekStyleText

(

)

[inline]

const nsStyleTextReset* nsStyleContext::PeekStyleTextReset

(

)

[inline]

const nsStyleUIReset* nsStyleContext::PeekStyleUIReset

(

)

[inline]

const nsStyleUserInterface* nsStyleContext::PeekStyleUserInterface

(

)

[inline]

const nsStyleVisibility* nsStyleContext::PeekStyleVisibility

(

)

[inline]

const nsStyleXUL* nsStyleContext::PeekStyleXUL

(

)

[inline]

nsPresContext* nsStyleContext::PresContext

(

)

const [inline]

nsrefcnt nsStyleContext::Release

(

void

)

[inline]

PRBool nsStyleContext::RelevantLinkVisited

(

)

const [inline]

void nsStyleContext::RemoveChild

(

nsStyleContext *

aChild

)

[protected]

void nsStyleContext::SetIsStyleIfVisited

(

)

[inline]

void nsStyleContext::SetStyle	(	nsStyleStructID	aSID,
		void *	aStruct
	)

void nsStyleContext::SetStyleColor

(

nsStyleColor *

aStruct

)

[inline]

void nsStyleContext::SetStyleFont

(

nsStyleFont *

aStruct

)

[inline]

void nsStyleContext::SetStyleIfVisited

(

already_AddRefed< nsStyleContext >

aStyleIfVisited

)

[inline]

void nsStyleContext::SetStyleList

(

nsStyleList *

aStruct

)

[inline]

void nsStyleContext::SetStyleQuotes

(

nsStyleQuotes *

aStruct

)

[inline]

void nsStyleContext::SetStyleSVG

(

nsStyleSVG *

aStruct

)

[inline]

void nsStyleContext::SetStyleTableBorder

(

nsStyleTableBorder *

aStruct

)

[inline]

void nsStyleContext::SetStyleText

(

nsStyleText *

aStruct

)

[inline]

void nsStyleContext::SetStyleUserInterface

(

nsStyleUserInterface *

aStruct

)

[inline]

void nsStyleContext::SetStyleVisibility

(

nsStyleVisibility *

aStruct

)

[inline]

---

Member Data Documentation

AllocationHeader* nsStyleContext::mAllocations [protected]

PRUint32 nsStyleContext::mBits [protected]

nsInheritedStyleData nsStyleContext::mCachedInheritedData [protected]

nsResetStyleData* nsStyleContext::mCachedResetData [protected]

nsStyleContext* nsStyleContext::mChild [protected]

nsStyleContext* nsStyleContext::mEmptyChild [protected]

nsStyleContext* nsStyleContext::mNextSibling [protected]

nsStyleContext* const nsStyleContext::mParent [protected]

nsStyleContext* nsStyleContext::mPrevSibling [protected]

nsCOMPtr<nsIAtom> nsStyleContext::mPseudoTag [protected]

PRUint32 nsStyleContext::mRefCnt [protected]

nsRuleNode* const nsStyleContext::mRuleNode [protected]

nsRefPtr<nsStyleContext> nsStyleContext::mStyleIfVisited [protected]

---

The documentation for this class was generated from the following files:

• nsStyleContext.h
• nsStyleStructList.h