TDockHeaderImages type

TDockHeaderImages = Array[TDockHeaderImageKind] of TCustomBitmap = class(TRasterImage)
private
 FPixelFormat: TPixelFormat;
 FPixelFormatNeedsUpdate: Boolean;
 FMaskHandle: HBITMAP;
 function GetHandleType: TBitmapHandleType;
 function GetMonochrome: Boolean;
 procedure SetBitmapHandle(const AValue: HBITMAP);
 procedure SetHandleType(AValue: TBitmapHandleType);
 procedure SetMonochrome(AValue: Boolean);
 procedure UpdatePixelFormat;
protected
 procedure MaskHandleNeeded; override;
 procedure PaletteNeeded; override;
 function CanShareImage(AClass: TSharedRasterImageClass): Boolean
 ; override;
 procedure Changed(Sender: TObject); override;
 function CreateDefaultBitmapHandle(const ADesc: TRawImageDescription)
: HBITMAP; override;
 procedure FreeMaskHandle;
 function GetBitmapHandle: HBITMAP; override;
 function GetMaskHandle: HBITMAP; override;
 function GetPalette: HPALETTE; override;
 function GetPixelFormat: TPixelFormat; override;
 function GetRawImagePtr: PRawImage; override;
 function GetRawImageDescriptionPtr: PRawImageDescription; override;
 class function GetSharedImageClass: TSharedRasterImageClass; override;
 procedure HandleNeeded; override;
 function InternalReleaseBitmapHandle: HBITMAP; override;
 function InternalReleaseMaskHandle: HBITMAP; override;
 function InternalReleasePalette: HPALETTE; override;
 procedure RawimageNeeded(ADescOnly: Boolean);
 procedure SetHandle(AValue: TLCLHandle); override;
 procedure SetPixelFormat(AValue: TPixelFormat); override;
 procedure UnshareImage(CopyContent: Boolean); override;
 function UpdateHandles(ABitmap: HBITMAP; AMask: HBITMAP): Boolean
 ; override;
public
 constructor Create; override;
 destructor Destroy; override;
 procedure Assign(Source: TPersistent); override;
 procedure Clear; override;
 procedure FreeImage; override;
 function LazarusResourceTypeValid(const ResourceType: string): Boolean
 ; override;
 function BitmapHandleAllocated: Boolean; override;
 function MaskHandleAllocated: Boolean; override;
 function PaletteAllocated: Boolean; override;
 function ReleaseHandle: HBITMAP;
 procedure SetHandles(ABitmap: HBITMAP; AMask: HBITMAP); override;
 procedure SetSize(AWidth: Integer; AHeight: Integer); override;
 property Handle: HBITMAP;
 property HandleType: TBitmapHandleType;
 property Monochrome: Boolean;
end