/*
 * Copyright (C) 2020 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.wm.shell.pip;

import android.graphics.Rect;

import com.android.wm.shell.shared.annotations.ExternalThread;

import java.util.function.Consumer;

/**
 * Interface to engage picture in picture feature.
 */
@ExternalThread
public interface Pip {
    /**
     * Expand PIP, it's possible that specific request to activate the window via Alt-tab.
     */
    default void expandPip() {
    }

    /**
     * Called when SysUI state changed.
     *
     * @param isSysUiStateValid Is SysUI state valid or not.
     * @param flag Current SysUI state.
     */
    default void onSystemUiStateChanged(boolean isSysUiStateValid, long flag) {
    }

    /**
     * Set the callback when {@link PipTaskOrganizer#isInPip()} state is changed.
     *
     * @param callback The callback accepts the result of {@link PipTaskOrganizer#isInPip()}
     *                 when it's changed.
     */
    default void setOnIsInPipStateChangedListener(Consumer<Boolean> callback) {}

    /**
     * Called when showing Pip menu.
     */
    default void showPictureInPictureMenu() {}

    /**
     * Called by NavigationBar and TaskbarDelegate in order to listen in for PiP bounds change. This
     * is mostly used for times where the PiP bounds could conflict with SystemUI elements, such as
     * a stashed PiP and the Back-from-Edge gesture.
     */
    default void addPipExclusionBoundsChangeListener(Consumer<Rect> listener) { }

    /**
     * Remove a callback added previously. This is used when NavigationBar is removed from the
     * view hierarchy or destroyed.
     */
    default void removePipExclusionBoundsChangeListener(Consumer<Rect> listener) { }

    /**
     * @return {@link PipTransitionController} instance.
     */
    default PipTransitionController getPipTransitionController() {
        return null;
    }
}