Add FloatProperties, which contains helpful properties for animating Rects.

/*

 * 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.systemui.util.animation

import android.graphics.Rect

import android.graphics.RectF

import androidx.dynamicanimation.animation.FloatPropertyCompat

/**

 * Helpful extra properties to use with the [PhysicsAnimator]. These allow you to animate objects

 * such as [Rect] and [RectF].

 *

 * There are additional, more basic properties available in [DynamicAnimation].

 */

class FloatProperties {

    companion object {

        /**

         * Represents the x-coordinate of a [Rect]. Typically used to animate moving a Rect

         * horizontally.

         *

         * This property's getter returns [Rect.left], and its setter uses [Rect.offsetTo], which

         * sets [Rect.left] to the new value and offsets [Rect.right] so that the width of the Rect

         * does not change.

         */

        @JvmField

        val RECT_X = object : FloatPropertyCompat<Rect>("RectX") {

            override fun setValue(rect: Rect?, value: Float) {

                rect?.offsetTo(value.toInt(), rect.top)

            }

            override fun getValue(rect: Rect?): Float {

                return rect?.left?.toFloat() ?: -Float.MAX_VALUE

            }

        }

        /**

         * Represents the y-coordinate of a [Rect]. Typically used to animate moving a Rect

         * vertically.

         *

         * This property's getter returns [Rect.top], and its setter uses [Rect.offsetTo], which

         * sets [Rect.top] to the new value and offsets [Rect.bottom] so that the height of the Rect

         * does not change.

         */

        @JvmField

        val RECT_Y = object : FloatPropertyCompat<Rect>("RectY") {

            override fun setValue(rect: Rect?, value: Float) {

                rect?.offsetTo(rect.left, value.toInt())

            }

            override fun getValue(rect: Rect?): Float {

                return rect?.top?.toFloat() ?: -Float.MAX_VALUE

            }

        }

        /**

         * Represents the x-coordinate of a [RectF]. Typically used to animate moving a RectF

         * horizontally.

         *

         * This property's getter returns [RectF.left], and its setter uses [RectF.offsetTo], which

         * sets [RectF.left] to the new value and offsets [RectF.right] so that the width of the

         * RectF does not change.

         */

        @JvmField

        val RECTF_X = object : FloatPropertyCompat<RectF>("RectFX") {

            override fun setValue(rect: RectF?, value: Float) {

                rect?.offsetTo(value, rect.top)

            }

            override fun getValue(rect: RectF?): Float {

                return rect?.left ?: -Float.MAX_VALUE

            }

        }

        /**

         * Represents the y-coordinate of a [RectF]. Typically used to animate moving a RectF

         * vertically.

         *

         * This property's getter returns [RectF.top], and its setter uses [RectF.offsetTo], which

         * sets [RectF.top] to the new value and offsets [RectF.bottom] so that the height of the

         * RectF does not change.

         */

        @JvmField

        val RECTF_Y = object : FloatPropertyCompat<RectF>("RectFY") {

            override fun setValue(rect: RectF?, value: Float) {

                rect?.offsetTo(rect.left, value)

            }

            override fun getValue(rect: RectF?): Float {

                return rect?.top ?: -Float.MAX_VALUE

            }

        }

    }

}

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