blob: 28d5cc5daa85afbf694fc9ca36127ffc269468df (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
-- File: SelectMgr_Filter.cdl
-- Created: Wed Mar 5 13:51:25 1997
-- Author: Robert COUBLANC
-- <rob@robox.paris1.matra-dtv.fr>
---Copyright: Matra Datavision 1997
deferred class Filter from SelectMgr inherits TShared from MMgt
---Purpose: The root class to define filter objects for selection.
-- Advance handling of objects requires the services of
-- filters. These only allow dynamic detection and
-- selection of objects which correspond to the criteria defined in each.
-- Eight standard filters inheriting SelectMgr_Filter are
-- defined in Open CASCADE.
-- You can create your own filters by defining new filter
-- classes inheriting this framework. You use these
-- filters by loading them into an AIS interactive context.
uses
EntityOwner from SelectMgr,
ShapeEnum from TopAbs
is
IsOk(me; anObj : EntityOwner from SelectMgr)
returns Boolean from Standard
is deferred;
---Purpose: Indicates that the selected Interactive Object
-- passes the filter. The owner, anObj, can be either
-- direct or user. A direct owner is the corresponding
-- construction element, whereas a user is the
-- compound shape of which the entity forms a part.
-- When an object is detected by the mouse - in AIS,
-- this is done through a context selector - its owner
-- is passed to the filter as an argument.
-- If the object returns Standard_True, it is kept; if
-- not, it is rejected.
-- If you are creating a filter class inheriting this
-- framework, and the daughter class is to be used in
-- an AIS local context, you will need to implement the
-- virtual function ActsOn.
ActsOn(me; aStandardMode : ShapeEnum from TopAbs)
returns Boolean from Standard is virtual;
---Purpose: Returns true in an AIS local context, if this filter
-- operates on a type of subshape defined in a filter
-- class inheriting this framework.
-- This function completes IsOk in an AIS local context.
end Filter;
|
