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Roles are a powerful way for designing complex behaviours while keeping good practices such as Single Responsibility, Dependency Inversion and Interface Segregation.

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/*
 * *********************************************************************************************************************
 *
 * TheseFoolishThings: Miscellaneous utilities
 * http://tidalwave.it/projects/thesefoolishthings
 *
 * Copyright (C) 2009 - 2023 by Tidalwave s.a.s. (http://tidalwave.it)
 *
 * *********************************************************************************************************************
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 CONDITIONS OF ANY KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations under the License.
 *
 * *********************************************************************************************************************
 *
 * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
 * git clone https://github.com/tidalwave-it/thesefoolishthings-src
 *
 * *********************************************************************************************************************
 */
package it.tidalwave.role.ui;

/***********************************************************************************************************************
 *
 * The role of an object that can be visible or not.
 *
 * @stereotype  Role
 * @author      Fabrizio Giudici
 * @since       3.2-ALPHA-7
 *
 **********************************************************************************************************************/
@FunctionalInterface
public interface Visible
  {
    public static final Class _Visible_ = Visible.class;

    /*******************************************************************************************************************
     *
     * A role that is always visible.
     *
     ******************************************************************************************************************/
    public static final Visible VISIBLE = () -> true;

    /*******************************************************************************************************************
     *
     * A role that is always invisible.
     *
     ******************************************************************************************************************/
    public static final Visible INVISIBLE = () -> false;

    /*******************************************************************************************************************
     *
     * Returns the current visibility status.
     *
     * @return            {@code true} if the object is visible
     *
     ******************************************************************************************************************/
    @SuppressWarnings("UnusedReturnValue")
    public boolean isVisible();
  }