GraphicComp(3U)

NAME
GraphicComp, GraphicComps - base classes for graphical component subjects

SYNOPSIS
#include <Unidraw/Components/grcomp.h>

DESCRIPTION
GraphicComp is an abstract base class for components that store graphical information in a Graphic object. GraphicComp is derived from Component and adds operations for manipulating its graphical attributes. GraphicComps is a non-abstract subclass of GraphicComp for composite graphical component subjects.

GRAPHICCOMP PUBLIC OPERATIONS

virtual ~GraphicComp()
    The destructor deletes the GraphicComp's graphic, if any.

virtual void Interpret(Command*)

virtual void Uninterpret(Command*)
    GraphicComp objects can (un)interpret the following commands:

    AlignCmd aligns the GraphicComp's graphic with respect to the graphic in the GraphicComp returned by AlignCmd::GetReference. The alignment's sense is defined by the alignments that the AlignCmd specifies: The first Alignment parameter returned by AlignCmd::GetAlignment specifies the alignment with respect to the reference graphic, while the second Alignment parameter specifies the alignment with respect to this's graphic.

    BrushCmd sets the graphic's brush to the BrushCmd's value.

    ColorCmd sets the graphic's foreground and background colors.

    FontCmd sets the graphic's font.

    MobilityCmd sets the GraphicComp's mobility to the MobilityCmd's value.

    MoveCmd translates the GraphicComp's graphic by the amounts in the MoveCmd.

    PatternCmd sets the graphic's pattern.

    RotateCmd rotates the GraphicComp's graphic by the amount in the RotateCmd.

    ScaleCmd scales the GraphicComp's graphic by the amounts in the ScaleCmd.

virtual Graphic* GetGraphic()
    Return the GraphicComp's graphic. GraphicComp subclass normally redefine this operation to return the graphic that defines their appearance.

virtual Component* GetParent()
    GraphicComp redefines GetParent to return its parent. However, GraphicComp does not store a pointer to the parent explicitly; instead, it obtains its graphic's parent and obtains the GraphicComp associated with the parent graphic. The graphic stores the GraphicComp that contains it in its tag (see SetGraphic below).

GraphicComp* GetComp(Iterator)

void SetComp(GraphicComp*, Iterator&)
    These operations do nothing by default. Subclasses that contain children should redefine them as follows: GetComp should return the GraphicComp to which an iterator points. SetComp should initialize the iterator to point to a particular GraphicComp in the list of children; it should initialize the iterator to point to a nil instance if the given GraphicComp is not a child.

void Append(GraphicComp*)

void Prepend(GraphicComp*)

void InsertAfter(Iterator, GraphicComp*)

void InsertBefore(Iterator, GraphicComp*)

void Remove(GraphicComp*)

void Remove(Iterator&)
    Unimplemented operations that composite subclasses should redefine for modifying the their (conceptual) list of children. Note that subclasses needn't necessarily store their children in a list data structure, but a list maps closely to the semantics of these operations.

    Append and Prepend add a GraphicComp to the end and the beginning of the list, respectively. InsertAfter and InsertBefore insert a GraphicComp after and before the GraphicComp pointed to by the iterator, respectively. The Remove operations remove a view from the list without deleting it. You can remove a view instance by referring to it explicitly or by specifying an iterator. If an iterator is supplied, the Remove operation should advance it to point to the following view as a side effect.

virtual void Bequeath()
    Modify the GraphicComp's graphic state by calling Bequeath on its Graphic. Graphic::Bequeath propagates this's graphic state to its immediate children, nullifying its own graphics state; see Graphic(3U) for a more complete description.

virtual Mobility GetMobility()

virtual void SetMobility(Mobility)
    Get and set the GraphicComp's mobility. GetMobility returns Undef by default, and SetMobility does nothing.

GRAPHICCOMP PROTECTED OPERATIONS

GraphicComp(Graphic* = nil)
    The Graphic instance that defines the GraphicComp's graphical attributes can be specified in the constructor, which is protected to guard against instantiation.

virtual void SetGraphic(Graphic*)

virtual GraphicComp* GetGraphicComp(Graphic*)
    SetGraphic sets the GraphicComp's graphic to the given one, and store this in the graphic using Graphic::SetTag. This makes it possible to obtain the GraphicComp that owns the graphic from the graphic itself. GetGraphicComp returns the GraphicComp associated with the given graphic.

void Skip(istream&)

void Mark(ostream&)
    Convenience functions that simply call their Catalog counterparts.

int ReadBgFilled(istream&)

PSBrush* ReadBrush(istream&)

PSColor* ReadColor(istream&)

PSFont* ReadFont(istream&)

PSPattern* ReadPattern(istream&)

PSTransformer* ReadTransformer(istream&)

char* ReadString(istream&)

Bitmap* ReadBitmap(istream&)

Raster* ReadGraymap(istream&)

Raster* ReadRaster(istream&)

void ReadVertices(istream&, Coord*&, Coord*&, int&)

void WriteBgFilled(boolean, ostream&)

void WriteBrush(PSBrush*, ostream&)

void WriteColor(PSColor*, ostream&)

void WriteFont(PSFont*, ostream&)

void WritePattern(PSPattern*, ostream&)

void WriteTransformer(PSTransformer*, ostream&)

void WriteString(const char*, ostream&)

void WriteBitmap(Bitmap*, ostream&)

void WriteGraymap(Raster*, ostream&)

void WriteRaster(Raster*, ostream&)

void WriteVertices(const Coord*, const Coord*, int, ostream&)
    Convenience functions for reading and writing common GraphicComp information. These operations are most often used in the Read and Write calls of GraphicComp subclasses. The Write... operations send a stream of bytes characterizing their first parameter to the ostream. The Read... operations reconstruct the object(s) from the bytes that the istream supplies.

GRAPHICCOMPS PUBLIC OPERATIONS

GraphicComps()

GraphicComps(Graphic*)

virtual ~GraphicComps()
    The parameterless constructor sets the GraphicComps' graphic to a new Picture instance, while the other lets you specify the graphic explicitly. The destructor deletes its children.

virtual void Interpret(Command*)

virtual void Uninterpret(Command*)
    GraphicComps can (un)interpret the following commands in addition to those that GraphicComp objects (un)interpret:

    BackCmd and FrontCmd change the position of the GraphicComps' children that are in the command's clipboard object. If the command has no clipboard, it will create one and fill it with the subjects of GraphicViews that are selected currently in the command's editor. Interpreting a BackCmd will move the children on the clipboard so that they appear behind the others, preserving their relative order; the opposite occurs when interpreting a FrontCmd.

    CutCmd removes the components in the CutCmd's clipboard from the GraphicComps and places them in the catalog's global clipboard. Interpret will create a clipboard containing the subjects of selected GraphicViews if the CutCmd has no clipboard initially.

    DeleteCmd removes the components in the DeleteCmd's clipboard from the GraphicComps and destroys them when the DeleteCmd is destroyed if it has not been uninterpreted. Interpret will create a clipboard containing the subjects of selected GraphicViews if the DeleteCmd has no clipboard initially.

    DupCmd duplicates the components in the DupCmd's clipboard, appending them to the list of children. Interpret will create a clipboard containing the subject of selected GraphicViews if the DupCmd has no clipboard initially.

    GroupCmd removes the components in the GroupCmd's clipboard from the GraphicComps and inserts them into the destination GraphicComp returned by GroupCmd::GetGroup. The destination is inserted at the position formerly occupied by the last component in the clipboard. If the GroupCmd has no clipboard initially, interpret will create a clipboard containing the subjects of selected GraphicViews. If GroupCmd does not define a destination, Interpret will create a GraphicComps instance and set the GroupCmd's destination explicitly. Interpret does nothing if the clipboard contains less than two components.

    UngroupCmd extracts the children from components in the UngroupCmd's clipboard and inserts them in order immediately after their parents. The parents are then removed from the GraphicComps. The parents are destroyed along with the UngroupCmd if it has not been Uninterpreted.

    PasteCmd appends copies of the components in the PasteCmd's clipboard to the GraphicComps. If the PasteCmd has no clipboard initially, it will use the global clipboard from the catalog.

GRAPHICCOMPS PROTECTED OPERATIONS

GraphicComp* Comp(UList*)

UList* Elem(Iterator)
    Convenience functions for extracting a GraphicComp from a UList element and a UList from an iterator.

void SelectViewsOf(GraphicComp*, Editor*)
    A convenience function for selecting all the views of the given GraphicComp that appear in the given editor. SelectViewsOf clears the original contents of the selection.

void SelectClipboard(Clipboard*, Editor)
    A convenience function for selecting all the views of all the components in the given Clipboard that appear in the given editor. SelectViewsOf clears the original contents of the selection.

void StorePosition(GraphicComp*, Command*)
    Store the given child's position into the given Command with Command::Store.

void RestorePosition(GraphicComp*, Command*)
    Insert the given GraphicComp into this based on position information stored in the given command. The position information must have been stored with StorePosition.

void Group(Clipboard*, GraphicComp* destination, Command*)

void Ungroup(GraphicComp* parent, Clipboard*, Command*)
    Helper functions used in the interpretation of GroupCmd and UngroupCmd, respectively. Group inserts the components in the clipboard into destination and inserts destination into this, storing undo information in the command. Ungroup removes all children from parent, puts them on the clipboard, and then removes parent from this. Ungroup also stores undo information in the command.

SEE ALSO
BrushCmd(3U), Catalog(3U), Clipboard(3U), ColorCmd(3U), Component(3U), Editor(3U), FontCmd(3U), Iterator(3U), PatternCmd(3U), Picture(3U), Selection(3U), UList(3U), align(3U), edit(3U), globals(3U), struct(3U), transforms(3U)