src/com/android/deskclock/widget/toast/SnackbarSlidingBehavior.kt

/*
 * 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.deskclock.widget.toast

import android.content.Context
import android.util.AttributeSet
import android.view.View
import androidx.annotation.Keep
import androidx.coordinatorlayout.widget.CoordinatorLayout

import com.google.android.material.snackbar.Snackbar

import kotlin.math.min

/**
 * Custom [CoordinatorLayout.Behavior] that slides with the [Snackbar].
 */
@Keep
class SnackbarSlidingBehavior(
    context: Context?,
    attrs: AttributeSet?
) : CoordinatorLayout.Behavior<View?>() {
    override fun layoutDependsOn(
        parent: CoordinatorLayout,
        child: View,
        dependency: View
    ): Boolean {
        return dependency is Snackbar.SnackbarLayout
    }

    override fun onDependentViewChanged(
        parent: CoordinatorLayout,
        child: View,
        dependency: View
    ): Boolean {
        updateTranslationY(parent, child)
        return false
    }

    override fun onDependentViewRemoved(parent: CoordinatorLayout, child: View, dependency: View) {
        updateTranslationY(parent, child)
    }

    override fun onLayoutChild(
        parent: CoordinatorLayout,
        child: View,
        layoutDirection: Int
    ): Boolean {
        updateTranslationY(parent, child)
        return false
    }

    private fun updateTranslationY(parent: CoordinatorLayout, child: View) {
        var translationY = 0f
        for (dependency in parent.getDependencies(child)) {
            translationY = min(translationY, dependency.y - child.bottom)
        }
        child.translationY = translationY
    }
}