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1: /*
2: * *************************************************************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *************************************************************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12: * You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
17: * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18: *
19: * *************************************************************************************************************************************************************
20: *
21: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.role.ui;
27:
28: /***************************************************************************************************************************************************************
29: *
30: * The role of an object that can be visible or not.
31: *
32: * @stereotype Role
33: * @author Fabrizio Giudici
34: * @since 3.2-ALPHA-7
35: *
36: **************************************************************************************************************************************************************/
37: @FunctionalInterface
38: public interface Visible
39: {
40: public static final Class<Visible> _Visible_ = Visible.class;
41:
42: /***********************************************************************************************************************************************************
43: * A role that is always visible.
44: **********************************************************************************************************************************************************/
45: public static final Visible VISIBLE = () -> true;
46:
47: /***********************************************************************************************************************************************************
48: * A role that is always invisible.
49: **********************************************************************************************************************************************************/
50: public static final Visible INVISIBLE = () -> false;
51:
52: /***********************************************************************************************************************************************************
53: * Returns the current visibility status.
54: *
55: * @return {@code true} if the object is visible
56: **********************************************************************************************************************************************************/
57: @SuppressWarnings("UnusedReturnValue")
58: public boolean isVisible();
59: }