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Autodocs
 Libraries:
 datatypes.library
  --background--
  --rexxhost--
  AddDTObject
  DisposeDTObject
  DoAsyncLayout
  DoDTMethodA
  DrawDTObjectA
  GetDTAttrsA
  GetDTMethods
  GetDTString
  GetDTTriggerMethods
  NewDTObjectA
  ObtainDTDrawInfoA
  ObtainDataTypeA
  PrintDTObjectA
  RefreshDTObjectA
  ReleaseDTDrawInfo
  ReleaseDataType
  RemoveDTObject
  SetDTAttrsA
Include
GuruMeditation
Docs » Autodocs » datatypes.library » --background--

PURPOSE

	The datatypes.library provides transparent data handling
abilities to applications. Application developers can register
their data format with datatypes.library and provide a class
library for handling their data within other applications.
OVERVIEW
* Object Oriented
datatypes.library implementation is object oriented, using the
boopsi functions of Intuition. Each data class is implemented
as a shared system library.
* Embedded Objects
datatypes.library provides the ability to embed different object
types within an application. For example, an application can
embed an picture object or even an AmigaGuide document browser
within their application's window. Objects can also be embedded
within other objects.
* Gadget-like
Embedded objects are actually boopsi gadgets. That means that
input handling is done on Intuition's task. Time intensive
operations, such as layout when the window size changes, are
off-loaded to a sub-process. Printing, clipboard operations,
file read/write are also off-loaded to a separate process on an
as-needed basis.
* Trigger Methods
Sometimes it is necessary for an application to provide
additional controls for navigating through an object. For
example, with an AmigaGuide object it is necessary to have
controls for "Contents", "Index", "Browse >", "Browse <". Each
class implements a method that returns the trigger methods, and
the appropriate labels, that a class supports.
* Format Conversion
As long as the objects are sub-classes of the same class, data
from one format can be written out as another format. For
example, it is possible to read in an ILBM file and write out a
JPEG file, since both data types are sub-classes of PICTURE.
* Future Compatible
Each class implements a method that returns the supported
methods within a class. This way an application can ask an
object if it is capable of any particular method, such as
DTM_WRITE for example.
* Data Type Detection
datatypes.library provides the ability to examine a file or
the clipboard to determine what type of data it contains.

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