tools.aqua.bgw.observable.ValueObserver.kt Maven / Gradle / Ivy

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A framework for board game applications.

There is a newer version: 0.5

/*
 *    Copyright 2021 The BoardGameWork Authors
 *    SPDX-License-Identifier: Apache-2.0
 *
 *    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.
 */

package tools.aqua.bgw.observable

/**
 * Observer interface for observable properties with values.
 */
@FunctionalInterface
fun interface ValueObserver {
	/**
	 * Can be implemented to react on changes to the observed property.
	 *
	 * @param oldValue Old value of property.
	 * @param newValue New value of property.
	 */
	fun update(oldValue: T, newValue: T)
}