Collapse all Symbian^3 Product Developer Library

CLafEdwinCustomWrapBase Class Reference

class CLafEdwinCustomWrapBase : public CBase

LAF support for custom line breaking in Edwins.

This class is used by CEikEdwin to determine how to place line breaks.

The custom line breaking interface is defined by the MFormCustomWrap class.

Inherits from

CLafEdwinCustomWrapBase
- CBase

Public Member Functions
	~CLafEdwinCustomWrapBase()
IMPORT_C TBool	GetLineBreakInContext(const TDesC &, TInt, TInt, TBool, TInt &)
IMPORT_C TBool	IsHangingCharacter(TUint)
IMPORT_C TUint	LineBreakClass(TUint, TUint &, TUint &)
IMPORT_C TBool	LineBreakPossible(TUint, TUint, TBool)
IMPORT_C CLafEdwinCustomWrapBase *	NewL(const CCoeControl &)

Protected Member Functions
	CLafEdwinCustomWrapBase(const CCoeControl &)

Private Member Functions
IMPORT_C void	MFormCustomWrap_Reserved_1()
IMPORT_C void	MFormCustomWrap_Reserved_2()

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()

Protected Attributes
const CCoeControl &	iControl

Private Attributes
TInt	iSpare

Constructor & Destructor Documentation

CLafEdwinCustomWrapBase(const CCoeControl &)

IMPORT_C

CLafEdwinCustomWrapBase

(

const CCoeControl &

aControl

)

[protected]

Constructor.

Test

Parameters

const CCoeControl & aControl

The Edwin control

~CLafEdwinCustomWrapBase()

IMPORT_C

~CLafEdwinCustomWrapBase

(

)

Destructor.

Test

Member Functions Documentation

GetLineBreakInContext(const TDesC &, TInt, TInt, TBool, TInt &)

IMPORT_C TBool	GetLineBreakInContext	(	const TDesC &	aText,
			TInt	aMinBreakPos,
			TInt	aMaxBreakPos,
			TBool	aForwards,
			TInt &	aBreakPos
		)	const

Gets the position of the first or last possible line break position in a text string.

This implements MFormCustomWrap::GetLineBreakInContext().

Return the first (if aForwards is TRUE) or last (if aForwards is FALSE) linebreak in aText, This must be in the range aMinBreakPos...aMaxBreakPos, which is a run of characters in the class ESaLineBreakClass, usually employed for Thai, Lao and Khmer letters, because these scripts don't use word spaces and need dictionary-based line breaking. The break position is returned in aBreakPos, which must be > 0 and < aText.Length() - 1. Return TRUE if a break is found, FALSE otherwise. Test

Parameters

const TDesC & aText	A string containing characters of class MTmCustom::ESaLineBreakClass.
TInt aMinBreakPos	A position within aText at which to begin searching for a possible line break position.
TInt aMaxBreakPos	A position within aText at which to stop searching for a possible line break position.
TBool aForwards	If ETrue, the function gets the first possible line break position (searches forwards from aMinBreakPos); if EFalse, gets the last one (searches backwards from aMaxBreakPos).
TInt & aBreakPos	On return, the position of the first or last possible line break within aText. This must be greater than zero and less than aText.Length()1, and must also be in the range aMinBreakPos to aMaxBreakPos.

IsHangingCharacter(TUint)

IMPORT_C TBool

IsHangingCharacter

(

TUint

aChar

)

const

Tests whether a character can overhang the right margin.

Test

Parameters

TUint aChar

The Unicode character code of interest

LineBreakClass(TUint, TUint &, TUint &)

IMPORT_C TUint	LineBreakClass	(	TUint	aCode,
			TUint &	aRangeStart,
			TUint &	aRangeEnd
		)	const

Gets the line break class for a Unicode character.

This implements MFormCustomWrap::LineBreakClass().

Returns the line break class for a character. Return the range of characters including aCode that are known to share this range.

The custom wrapping interface returns the default implementation. The overriding implementation could return different value to perform custom line break. Test

Parameters

TUint aCode	The Unicode character code
TUint & aRangeStart	On return, contains the Unicode character code at the start of the range including aCode that shares the same line break class as aCode.
TUint & aRangeEnd	On return, contains the Unicode character code at the end of the range including aCode that shares the same line break class as aCode

LineBreakPossible(TUint, TUint, TBool)

IMPORT_C TBool	LineBreakPossible	(	TUint	aPrevClass,
			TUint	aNextClass,
			TBool	aHaveSpaces
		)	const

Tests whether a line break is possible between two characters.

This implements MFormCustomWrap::LineBreakPossible().

Return TRUE if a line break is possible between characters of the two specified classes. If aHaveSpaces is TRUE, one or more characters in ESpLineBreakClass was found between the characters in the two specified classes.

For the custom implementation here, returns true everytime, ie a line break is possible anywhere. This allows the edwin to break a line anywhere, thus eliminating the jagged white space at the right hand side of the edwin window. Test

Parameters

TUint aPrevClass	The line break class of the previous non-space character.
TUint aNextClass	The line break class of the next non-space character.
TBool aHaveSpaces	True if there are one or more space characters (with a line break class of MTmCustom::ESpLineBreakClass) between aPrevClass and aNextClass; false if not.