TCustomIcon

type TCustomIcon = class(TRasterImage)

protected

  FCurrent: Integer;

FCurrent - local variable to hold current sequence number

  FRequestedSize: TSize;

FRequestedSize - local variable to hold requested size of Icon

  procedure MaskHandleNeeded; override;

MaskHandleNeeded - method to signal that a handle is required for the Mask

  procedure PaletteNeeded; override;

PaletteNeeded - method to signal that a Palette is required

  function CanShareImage(); override;

CanShareImage - returns True if specified class of image can be shared

  procedure CheckRequestedSize;

CheckRequestedSize - method to ensure correct size requested

  function GetIndex();

GetIndex - returns the Index value of the Icon with specified format and size (.icn files can contain several versions of image)

  function GetBitmapHandle; override;

GetBitmapHandle - returns a Birmap Handle for the Image

protected

  class function GetDefaultSize; virtual;

GetDefaultSize - returns default size for Icon

protected

  function GetMasked; override;

GetMasked - returns True if the Image is Masked

  function GetMaskHandle; override;

GetMaskHandle - returns a bitmap handle for the Mask

  function GetPalette; override;

GetPalette - returns a Handle for the Palette

  function GetPixelFormat; override;

GetPixelFormat - returns the pixel format for the Image

  function GetRawImagePtr; override;

GetRawImagePtr - returns a pointer to the Raw Image

  function GetRawImageDescriptionPtr; override;

GetRawImageDescriptionPtr - returns a pointer to a raw image description

  function GetTransparent; override;

GetTransparent - returns True if the graphic is transparent

protected

  class function GetTypeID; virtual;

GetTypeID - returns Identifier for type of Icon

  class function GetSharedImageClass; override;

GetSharedImageClass - returns the class of Shared Raster Image

protected

  procedure HandleNeeded; override;

HandleNeeded - method to signal that a handle is required

  function InternalReleaseBitmapHandle; override;

InternalReleaseBitmapHandle - releases Bitmap Handle and returns its value

  function InternalReleaseMaskHandle; override;

InternalReleaseMaskHandle - releases Mask Handle and returns its value

  function InternalReleasePalette; override;

InternalReleasePalette - releases Palette Handle and returns its value

  procedure ReadData(); override;

ReadData - reads data for the Graphic from a stream

  procedure ReadStream(); override;

ReadStream - loads imagedata into rawimage, this method shouldn't call changed()

  procedure SetMasked(); override;

SetMasked - specifies if the image is to be masked

  procedure SetPixelFormat(); override;

SetPixelFormat - specifies the format for Pixels in this Image

  procedure SetTransparent(); override;

  procedure UnshareImage(); override;

UnshareImage - stops an image from being shared: if CopyContent is True, the Image gets copied

  procedure UpdateCurrentView;

UpdateCurrentView - updates the current appearance of the Icon

  procedure SetHandle(); override;

  function UpdateHandle(); virtual;

  function UpdateHandles(); override;

UpdateHandles - called when handles are created from rawimage (true when handle changed)

  procedure WriteStream(); override;

WriteStream - specifies which stream to be used for writing

public

  constructor Create; override;

Create - constructor for TGraphic: calls inherited Create

  procedure Add();

Add - an Icon formatted as AFormat, with specified Height and Width

  procedure Assign(); override;

Assign checks if Source is correct data type, then copies image data

  procedure AssignImage(); virtual;

AssignImage - copies information from the source image to the current one

  procedure Clear; override;

Clear the Icon and release its resources

  procedure Delete();

Delete the indexed Icon

  procedure Remove();

Remove the Icon specified by AFormat, AHeight and AWidth

  procedure GetDescription();

GetDescription - find the description for the Icon

  procedure SetSize(); override;

SetSize - write the size (width, height) of the Icon

public

  class function GetFileExtensions; override;

GetFileExtensions returns valid file extensions, in this case 'ico'

public

  function LazarusResourceTypeValid(); override;

Check that the Resource specified for reading or writing is a valid type - result True if it is

  procedure LoadFromResourceName(); override;

  procedure LoadFromResourceID(); override;

  procedure LoadFromResourceHandle();

  function BitmapHandleAllocated; override;

BitmapHandleAllocated - returns True if a handle has been allocated for the Bitmap

  function MaskHandleAllocated; override;

MaskHandleAllocated - returns True if a handle has been allocated for the Mask

  function PaletteAllocated; override;

PaletteAllocated - returns True if a Palette has been allocated

  procedure SetHandles(); override;

SetHandles - allows the user to specify handles

  function GetBestIndexForSize();

GetBestIndexForSize - returns the best estimate of the index value for size

  property Current: Integer; [rw]

Current - the sequence number of the current Icon

  property Count: Integer; [r]

Count - the number of references to this Icon

end;

TCustomIcon

TCustomIcon - base class for TIcon

TRasterImage

TRasterImage - base class for a number of graphic controls, including TCustomBitmap and TCustomIcon, which use a raster of dots to display graphic information

TGraphic

TGraphic - Base class for dealing with Graphic images

TPersistent

TObject