list of classes

RSGroup

A RSGroup represents a collection of Roassal shapes. As soon as one assume a collection contains graphical elements, then it is convenient to be able to perform some operations (e.g., getting the encompassing rectangle of the elements, transforming a collection into a composite shape). RSGroup is a subclass of OrderedCollection. A RSGroup is not designed to contain other things than Roassal shapes.

Responsibility: handle a collection of graphical shapes in an intuitive and efficient way. A group is also responsible to retrieve shapes from a given model object.

Collaborators: RSGroup is a central class in Roassal. Shapes are held in instance of RSGroup.

Variables:

• shapeFromModelCache: a group of shapes must remember the model to speed up the retreival of shapes from a given object model.

Example:

shapes := (1 to: 20) collect: [ :value | 
	| g |
	g := RSGroup new.
	g add: (RSEllipse new size: 30 atRandom).
	g add: (RSLabel new text: value).
	g asShape ].

c := RSCanvas new.
c addAll: shapes.
RSFlowLayout on: shapes.
c @ RSCanvasController.

Layout may be applied on a group

shapes := (1 to: 20) collect: [ :value | 
	| g |
	g := RSGroup new.
	g add: (RSLabel new text: value).
	g add: (RSEllipse new size: 30 atRandom).
	RSVerticalLineLayout new center; gapSize: 0; on: g.
	g asShape ].

c := RSCanvas new.
c addAll: shapes.
RSFlowLayout on: shapes.
c @ RSCanvasController.

g := RSGroup new.
g add: (RSBox new model: 'hello').
g add: (RSEllipse new model: 'world').
g shapeFromModel: 'hello' "=> a RSBox(hello))"