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1 | -- Created on: 1997-03-05 |
2 | -- Created by: Robert COUBLANC |
3 | -- Copyright (c) 1997-1999 Matra Datavision |
4 | -- Copyright (c) 1999-2012 OPEN CASCADE SAS |
5 | -- |
6 | -- The content of this file is subject to the Open CASCADE Technology Public |
7 | -- License Version 6.5 (the "License"). You may not use the content of this file |
8 | -- except in compliance with the License. Please obtain a copy of the License |
9 | -- at http://www.opencascade.org and read it completely before using this file. |
10 | -- |
11 | -- The Initial Developer of the Original Code is Open CASCADE S.A.S., having its |
12 | -- main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. |
13 | -- |
14 | -- The Original Code and all software distributed under the License is |
15 | -- distributed on an "AS IS" basis, without warranty of any kind, and the |
16 | -- Initial Developer hereby disclaims all such warranties, including without |
17 | -- limitation, any warranties of merchantability, fitness for a particular |
18 | -- purpose or non-infringement. Please see the License for the specific terms |
19 | -- and conditions governing the rights and limitations under the License. |
20 | |
7fd59977 |
21 | |
22 | |
23 | deferred class Filter from SelectMgr inherits TShared from MMgt |
24 | |
25 | ---Purpose: The root class to define filter objects for selection. |
26 | -- Advance handling of objects requires the services of |
27 | -- filters. These only allow dynamic detection and |
28 | -- selection of objects which correspond to the criteria defined in each. |
29 | -- Eight standard filters inheriting SelectMgr_Filter are |
30 | -- defined in Open CASCADE. |
31 | -- You can create your own filters by defining new filter |
32 | -- classes inheriting this framework. You use these |
33 | -- filters by loading them into an AIS interactive context. |
34 | |
35 | uses |
36 | EntityOwner from SelectMgr, |
37 | ShapeEnum from TopAbs |
38 | is |
39 | IsOk(me; anObj : EntityOwner from SelectMgr) |
40 | returns Boolean from Standard |
41 | is deferred; |
42 | ---Purpose: Indicates that the selected Interactive Object |
43 | -- passes the filter. The owner, anObj, can be either |
44 | -- direct or user. A direct owner is the corresponding |
45 | -- construction element, whereas a user is the |
46 | -- compound shape of which the entity forms a part. |
47 | -- When an object is detected by the mouse - in AIS, |
48 | -- this is done through a context selector - its owner |
49 | -- is passed to the filter as an argument. |
50 | -- If the object returns Standard_True, it is kept; if |
51 | -- not, it is rejected. |
52 | -- If you are creating a filter class inheriting this |
53 | -- framework, and the daughter class is to be used in |
54 | -- an AIS local context, you will need to implement the |
55 | -- virtual function ActsOn. |
56 | |
57 | ActsOn(me; aStandardMode : ShapeEnum from TopAbs) |
58 | returns Boolean from Standard is virtual; |
59 | ---Purpose: Returns true in an AIS local context, if this filter |
60 | -- operates on a type of subshape defined in a filter |
61 | -- class inheriting this framework. |
62 | -- This function completes IsOk in an AIS local context. |
63 | |
64 | |
65 | end Filter; |