SlotComp(3U)						    InterViews Reference Manual 					      SlotComp(3U)

NAME

       SlotComp, SlotView, HSlotComp, HSlotView, VSlotComp, VSlotView, SlotGraphic, PSSlot - abstract base class and subclasses for slot connector
       subject and view; and structured graphic and PostScript external representation classes for slots

SYNOPSIS

       #include <Unidraw/Components/slot.h>

DESCRIPTION

       SlotComp is a Connector subclass that supports connectivity with one degree of freedom.	It serves as an abstract base class from which	to
       derive  HSlotComp  and VSlotComp, which support horizontal and vertical orientations.  The slot component classes use SlotGraphics to store
       their graphical attributes.  SlotView is an abstract subclass of ConnectorView for displaying slots. HSlotView and VSlotView are  SlotViews
       that  display slots with the corresponding orientations.  Finally, PSSlot is a PostScriptView that externalizes the slot subject's informa-
       tion in PostScript form.

SLOTCOMP PUBLIC OPERATIONS

       virtual void Interpret(Command*)
       virtual void Uninterpret(Command*)
	      SlotComp (un)interprets a subset of commands that connectors can generally interpret, namely MoveCmd, BrushCmd, AlignCmd,  Mobility-
	      Cmd, DeleteCmd, and CutCmd.

       virtual Mobility GetMobility()
       virtual void SetMobility(Mobility)
	      SlotComp redefines these functions to return and assign its _mobility protected member.  Slots have fixed mobility initially.

       Slot* GetSlot()
	      Return the Slot graphic that defines the line's attributes.  GetSlot is simply a more specific form of the GetGraphic operation.

SLOTCOMP PROTECTED OPERATIONS

       SlotComp(SlotGraphic* = nil)
	      The  constructor	takes  an optional SlotGraphic that defines the slot's graphical attributes. It is protected to prevent instantia-
	      tion, since SlotComp is an abstract class.

       void SetOrientation(SlotGraphic*, Orientation)
	      Define the orientation of the SlotComp's SlotGraphic.  Only SlotComp can specify this SlotGraphic attribute; HSlotComp and VSlotComp
	      subclasses set it to reflect their respective orientations.

SLOTVIEW PUBLIC OPERATIONS

       virtual void Interpret(Command*)
	      SlotView interprets AlignToGridCmd to align its starting point to the grid.

       virtual Manipulator* CreateManipulator(
	  Viewer*, Event&, Transformer*, Tool*
       )

       virtual void InterpretManipulator(Manipulator*)
	      SlotViews  respond  only	to  manipulation by GraphicCompTools, MoveTools, and ConnectTools. SlotView inherits its MoveTool response
	      from ConnectorView.  GraphicCompTool will let the user sweep out a crosshaired rectangle that reflects the slot's size and  orienta-
	      tion.   Creation	will  be influenced by gravity, if any. SlotView creates a ConnectManip in response to the ConnectTool, which will
	      exhibit a gravational attraction to potential target connectors.	SlotView will produce a ConnectCmd to connect the slot to its tar-
	      get. A slot connected in this way will receive floating mobility.

       SlotComp* GetSlotComp()
	      Return the subject.

SLOTVIEW PROTECTED OPERATIONS

       SlotView(SlotComp* = nil)
	      Create an SlotView, optionally supplying the subject.  The constructor is protected to prevent instantiation.

       SlotGraphic* GetSlot()
	      Return the SlotGraphic that defines the slot's attributes.  GetSlot is simply a more specific form of the GetGraphic operation.

       virtual SlotComp* NewSubject(SlotGraphic*)
	      A  helper  function  that creates a SlotComp subject with the given slot graphic. This function produces the proper subject when the
	      GraphicCompTool's manipulator is interpreted.  HSlotView and VSlotView redefine this operation to return the corresponding  SlotComp
	      subclasses, thus eliminating the need to reimplement InterpretManipulator.

       Manipulator* CreateGraphicCompManip(
	   Viewer*, Event&, Transformer*, Tool*
       )

       Manipulator* CreateConnectManip(
	   Viewer*, Event&, Transformer*, Tool*
       )

       Command* InterpretGraphicCompManip(Manipulator*)
       Command* InterpretConnectManip(Manipulator*)
	      Helper  functions used by CreateManipulator and InterpretManipulator to create and interpret the manipulators associated with Graph-
	      icCompTool and ConnectTool.

SLOTGRAPHIC PUBLIC OPERATIONS

       SlotGraphic(Coord, Coord, Coord, Graphic* = nil)
	      Create a SlotGraphic, specifying the starting point, length, and optionally a graphic from which	to  obtain  its  default  graphics
	      attributes.

       void GetOriginal(Coord&, Coord&, Coord&)
	      Return the SlotGraphic's original geometry parameters as specified in the constructor.

PSSLOT PUBLIC OPERATIONS

       PSSlot(SlotComp* = nil)
	      Construct a PostScript external representation of the given subject, if any.

SEE ALSO

       BrushCmd(3U),  ConnectTool(3U),	Connector(3U), ConnectorView3U), Event(3I), Graphic(3U), GraphicCompTool(3U), Grid(3U), MoveTool(3U), Pat-
       ternCmd(3U), PostScriptView(3U), Transformer(3I), Viewer(3U), align(3U), edit(3U), globals(3U), manips(3U), transforms(3U)

Unidraw 							  23 January 1991						      SlotComp(3U)