7fd59977 |
1 | -- File: AIS_TypeFilter.cdl |
2 | -- Created: Thu Mar 6 16:56:36 1997 |
3 | -- Author: Robert COUBLANC |
4 | -- <rob@robox.paris1.matra-dtv.fr> |
5 | ---Copyright: Matra Datavision 1997 |
6 | |
7 | |
8 | class TypeFilter from AIS inherits Filter from SelectMgr |
9 | |
10 | ---Purpose: Selects Interactive Objects through their types. The |
11 | -- filter questions each Interactive Object in local context |
12 | -- to determine whether it has an non-null owner, and if |
13 | -- so, whether it is of the desired type. If the object |
14 | -- returns true in each case, it is kept. If not, it is rejected. |
15 | -- By default, the interactive object has a None type |
16 | -- and a signature of 0. A filter for type specifies a |
17 | -- choice of type out of a range at any level enumerated |
18 | -- for type or kind. The choice could be for kind of |
19 | -- interactive object, of dimension, of unit, or type of axis, |
20 | -- plane or attribute. |
21 | -- If you want to give a particular type and signature to |
22 | -- your Interactive Object, you must redefine two virtual |
23 | -- methods: Type and Signature. |
24 | -- This filter is used in both Neutral Point and open local contexts. |
25 | -- In the Collector viewer, you can only locate |
26 | -- Interactive Objects which answer positively to the |
27 | -- positioned filters when a local context is open. |
28 | -- Warning |
29 | -- When you close a local context, all temporary |
30 | -- interactive objects are deleted, all selection modes |
31 | -- concerning the context are cancelled, and all content |
32 | -- filters are emptied. |
33 | |
34 | uses |
35 | KindOfInteractive from AIS, |
36 | EntityOwner from SelectMgr |
37 | |
38 | is |
39 | Create(aGivenKind : KindOfInteractive from AIS) |
40 | returns mutable TypeFilter from AIS; |
41 | ---Purpose: Initializes filter for type, aGivenKind. |
42 | IsOk (me;anobj : EntityOwner from SelectMgr) |
43 | returns Boolean from Standard is redefined virtual; |
44 | ---Purpose: Returns False if the transient is not an Interactive |
45 | -- Object, or if the type of the Interactive Object is not |
46 | -- the same as that stored in the filter. |
47 | |
48 | fields |
49 | myKind : KindOfInteractive from AIS is protected; |
50 | |
51 | end TypeFilter; |