packages/SystemUI/src/com/android/systemui/shade/NotifPanelEvents.kt

/*
 * Copyright (C) 2022 The Android Open Source Project
 *
 * 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 com.android.systemui.shade

/** Provides certain notification panel events.  */
interface NotifPanelEvents {

    /** Registers callbacks to be invoked when notification panel events occur.  */
    fun registerListener(listener: Listener)

    /** Unregisters callbacks previously registered via [registerListener]  */
    fun unregisterListener(listener: Listener)

    /** Callbacks for certain notification panel events. */
    interface Listener {

        /** Invoked when the notification panel starts or stops collapsing. */
        fun onPanelCollapsingChanged(isCollapsing: Boolean)

        /**
         * Invoked when the notification panel starts or stops launching an [android.app.Activity].
         */
        fun onLaunchingActivityChanged(isLaunchingActivity: Boolean)
    }
}