1 /*
2  * Copyright 2023 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.compose.animation.scene.transformation
18 
19 import androidx.compose.ui.geometry.Offset
20 import androidx.compose.ui.unit.Dp
21 import androidx.compose.ui.unit.dp
22 import com.android.compose.animation.scene.Element
23 import com.android.compose.animation.scene.ElementMatcher
24 import com.android.compose.animation.scene.OverscrollScope
25 import com.android.compose.animation.scene.SceneKey
26 import com.android.compose.animation.scene.SceneTransitionLayoutImpl
27 import com.android.compose.animation.scene.TransitionState
28 
29 internal class Translate(
30     override val matcher: ElementMatcher,
31     private val x: Dp = 0.dp,
32     private val y: Dp = 0.dp,
33 ) : PropertyTransformation<Offset> {
transformnull34     override fun transform(
35         layoutImpl: SceneTransitionLayoutImpl,
36         scene: SceneKey,
37         element: Element,
38         sceneState: Element.SceneState,
39         transition: TransitionState.Transition,
40         value: Offset,
41     ): Offset {
42         return with(layoutImpl.density) {
43             Offset(
44                 value.x + x.toPx(),
45                 value.y + y.toPx(),
46             )
47         }
48     }
49 }
50 
51 internal class OverscrollTranslate(
52     override val matcher: ElementMatcher,
<lambda>null53     val x: OverscrollScope.() -> Float = { 0f },
<lambda>null54     val y: OverscrollScope.() -> Float = { 0f },
55 ) : PropertyTransformation<Offset> {
transformnull56     override fun transform(
57         layoutImpl: SceneTransitionLayoutImpl,
58         scene: SceneKey,
59         element: Element,
60         sceneState: Element.SceneState,
61         transition: TransitionState.Transition,
62         value: Offset,
63     ): Offset {
64         // As this object is created by OverscrollBuilderImpl and we retrieve the current
65         // OverscrollSpec only when the transition implements HasOverscrollProperties, we can assume
66         // that this method was invoked after performing this check.
67         val overscrollProperties = transition as TransitionState.HasOverscrollProperties
68 
69         return Offset(
70             x = value.x + overscrollProperties.overscrollScope.x(),
71             y = value.y + overscrollProperties.overscrollScope.y(),
72         )
73     }
74 }
75