Taxonomy Categories:
Member Functions:
Interface Category:
API.
Inherits From:
None.
Inherited By:
TCanvasGraphicDequeReadIterator
Purpose:
Base class for all canvas graphic read iterators. Permits iteration over graphics in an underlying canvas representation with read-only access.
Instantiation:
Allocate on the heap or the stack.
Deriving Classes:
Abstract base class; must be derived.
Should be derived in parallel with classed derived from MCanvasRepresentation.
Concurrency:
Not multithread safe.
Resource Use:
No special requirements.
virtual ~ TCanvasGraphicReadIterator ()
Interface Category:
API.
Purpose:
Destructor.
Calling Context:
Called to destroy an object.
Parameters:
Return Value:
None.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
None.
virtual const MCanvasGraphic * First ()
Interface Category:
API.
Purpose:
Provides read-only access to the first canvas graphic in the underlying canvas representation during iteration.
Calling Context:
Called to iterate over graphics in a canvas representation.
Parameters:
Return Value:
const MCanvasGraphic * -A const pointer to a canvas graphic.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
Pure virtual function; must be overridden.
virtual const MCanvasGraphic * Last ()
Interface Category:
API.
Purpose:
Provides read-only access to the last canvas graphic in the underlying canvas representation during iteration.
Calling Context:
Called to iterate over graphics in a canvas representation.
Parameters:
Return Value:
const MCanvasGraphic * -A const pointer to a canvas graphic.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
Pure virtual function; must be overridden.
virtual const MCanvasGraphic * Next ()
Interface Category:
API.
Purpose:
Provides read-only access to the next canvas graphic in the underlying canvas representation during iteration.
Calling Context:
Called to iterate over graphics in a canvas representation.
Parameters:
Return Value:
const MCanvasGraphic * -A const pointer to a canvas graphic.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
Pure virtual function; must be overridden.
virtual const MCanvasGraphic * Previous ()
Interface Category:
API.
Purpose:
Provides read-only access to the previous canvas graphic in the underlying canvas representation during iteration.
Calling Context:
Called to iterate over graphics in a canvas representation.
Parameters:
Return Value:
const MCanvasGraphic * -A const pointer to a canvas graphic.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
Pure virtual function; must be overridden.
TCanvasGraphicReadIterator ()
Interface Category:
API.
Purpose:
Default constructor.
Calling Context:
Called by constructors of derived classes.
Parameters:
Return Value:
None.
Exceptions:
Throws no exceptions, passes all exceptions through.
Concurrency:
Not multithread safe.
Other Considerations:
None.
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