xref: /frameworks/support/transition/src/main/java/androidx/transition/ViewOverlayImpl.java

/*
 * Copyright (C) 2016 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 androidx.transition;

import android.graphics.drawable.Drawable;

import androidx.annotation.NonNull;

interface ViewOverlayImpl {

    /**
     * Adds a Drawable to the overlay. The bounds of the drawable should be relative to
     * the host view. Any drawable added to the overlay should be removed when it is no longer
     * needed or no longer visible.
     *
     * @param drawable The Drawable to be added to the overlay. This drawable will be
     *                 drawn when the view redraws its overlay.
     * @see #remove(Drawable)
     */
    void add(@NonNull Drawable drawable);

    /**
     * Removes all content from the overlay.
     */
    void clear();

    /**
     * Removes the specified Drawable from the overlay.
     *
     * @param drawable The Drawable to be removed from the overlay.
     * @see #add(Drawable)
     */
    void remove(@NonNull Drawable drawable);

}