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ColorUtils Class Reference

class ColorUtils

Provides static functions for manipulating colours.

TDisplayMode

Public Member Functions
IMPORT_C TRgb	ColorAdjust ( TRgb , TInt )
IMPORT_C void	CreateGradientBitmapL ( CFbsBitmap &, const RWsSession &, TInt , TBitmapOrientation , TRgb , TRgb )
IMPORT_C CColorList *	CreateSystemColorListL ( RFs &)
IMPORT_C CColorList *	CreateSystemColorListL ( RFs &, const CColorList &)
IMPORT_C void	GetRgbDerivedBorderColors ( TGulBorder::TColors &, TRgb , TDisplayMode )
IMPORT_C TRgb	RgbDarkerColor ( TRgb , TDisplayMode )
IMPORT_C TRgb	RgbLighterColor ( TRgb , TDisplayMode )
IMPORT_C TRgb	RgbMidDarkerColor ( TRgb , TDisplayMode )
IMPORT_C void	UpdateSystemColorListL ( RFs &, CColorList &)

Public Member Enumerations
enum	TBitmapOrientation { EBitmapOrientationVertical , EBitmapOrientationHorizontal }

Member Functions Documentation

ColorAdjust(TRgb, TInt)

IMPORT_C TRgb	ColorAdjust	(	TRgb	aColor,
			TInt	aPercentage
		)	[static]

Brightens or darkens a 24-bit colour by a percentage.

If the percentage given is less than 100%, a darker colour will be returned. The algorithm brightens or darkens each of the R, G and B channels equally.

Parameters

TRgb aColor	Input colour.
TInt aPercentage	Percentage by which to adjust the input colour.

CreateGradientBitmapL(CFbsBitmap &, const RWsSession &, TInt, TBitmapOrientation, TRgb, TRgb)

IMPORT_C void	CreateGradientBitmapL	(	CFbsBitmap &	aBitmap,
			const RWsSession &	aWs,
			TInt	aBreadth,
			TBitmapOrientation	aOrientation,
			TRgb	aStartColor,
			TRgb	aEndColor
		)	[static]

Creates a CFbsBitmap containing a colour gradient.

To create a gradient, the end colour aEndColor must be different to the start colour aStartingColor.

Parameters

CFbsBitmap & aBitmap	Bitmap which on return contains the colour gradient.
const RWsSession & aWs	Handle to a window server session.
TInt aBreadth	The width or the height of the bitmap, depending on the orientation.
TBitmapOrientation aOrientation	The bitmap's orientation (vertical or horizontal).
TRgb aStartColor	The start color.
TRgb aEndColor	The end color.

CreateSystemColorListL(RFs &)

IMPORT_C CColorList *

CreateSystemColorListL

(

RFs &

aFs

)

[static]

Parameters

RFs & aFs

CreateSystemColorListL(RFs &, const CColorList &)

IMPORT_C CColorList *	CreateSystemColorListL	(	RFs &	aFs,
			const CColorList &	aColorList
		)	[static]

Parameters

RFs & aFs
const CColorList & aColorList

GetRgbDerivedBorderColors(TGulBorder::TColors &, TRgb, TDisplayMode)

IMPORT_C void	GetRgbDerivedBorderColors	(	TGulBorder::TColors &	aBorderColors,
			TRgb	aBackgroundColor,
			TDisplayMode	aMode
		)	[static]

Gets the colours to use for a control's border.

Lighter and darker tones in the border are derived from the specified TRgb background colour using an algorithm operating on the RGB value of this color or a lookup table, depending on the display mode aMode. It sets the values of the aBorderColors members iBack, iLight, iMidlight, iMid, and iDark.

Parameters

TGulBorder::TColors & aBorderColors	On return, the derived border colours.
TRgb aBackgroundColor	The control's background colour.
TDisplayMode aMode	The display mode.

RgbDarkerColor(TRgb, TDisplayMode)

IMPORT_C TRgb	RgbDarkerColor	(	TRgb	aRgb,
			TDisplayMode	aMode
		)	[static]

Creates a darker color.

Parameters

TRgb aRgb	The RGB color.
TDisplayMode aMode	The display mode, which indicates the screen output of the colour e.g. 256 colour display mode (8 bpp).

RgbLighterColor(TRgb, TDisplayMode)

IMPORT_C TRgb	RgbLighterColor	(	TRgb	aRgb,
			TDisplayMode	aMode
		)	[static]

Creates a lighter colour.

Parameters

TRgb aRgb	The Rgb colour.
TDisplayMode aMode	The display mode, which indicates the screen output of the colour e.g. 256 colour display mode (8 bpp).

RgbMidDarkerColor(TRgb, TDisplayMode)

IMPORT_C TRgb	RgbMidDarkerColor	(	TRgb	aRgb,
			TDisplayMode	aMode
		)	[static]

Creates a medium dark version of the colour.

This function darkens the colour 50% less than RgbDarkerColor() .

Parameters

TRgb aRgb	The Rgb color.
TDisplayMode aMode	The display mode, which indicates the screen output of the colour e.g. 256 colour display mode (8 bpp).

UpdateSystemColorListL(RFs &, CColorList &)

IMPORT_C void	UpdateSystemColorListL	(	RFs &	aFs,
			CColorList &	aColorList
		)	[static]

Parameters

RFs & aFs
CColorList & aColorList

Member Enumerations Documentation

Enum TBitmapOrientation

The orientation of a bitmap.

Enumerators

EBitmapOrientationVertical	The bitmap is vertical.
EBitmapOrientationHorizontal	The bitmap is horizontal.