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Commit 139a2cb6 authored by Mike Schneider's avatar Mike Schneider
Browse files

[MotionValue] implementation #MotionMechanics 

The [MotionValue] implementation, transforming an input value to an (animated) output value, acording to the [MotionSpec].

Background on design and motivation in go/motionvalue-design

Flag: NONE Initial commits for new library, currently unused.
Test: atest mechanics_tests
Bug: 379248269
Change-Id: I959517ff863c060b655c40950b95f7ae0cea2e3d
parent fd9fc8e7

mechanics/src/com/android/mechanics/MotionValue.kt

0 → 100644
+807 −0

File added.

Preview size limit exceeded, changes collapsed.

mechanics/src/com/android/mechanics/spring/SpringParameters.kt

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ import kotlin.math.pow 
 * @see SpringParameters function to create this value.

 */

@JvmInline

value class SpringParameters(private val packedValue: Long) {

value class SpringParameters(val packedValue: Long) {

    val stiffness: Float

        get() = unpackFloat1(packedValue)

mechanics/src/com/android/mechanics/spring/SpringState.kt

+5 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ import kotlin.math.sqrt 
 * @see SpringState function to create this value.

 */

@JvmInline

value class SpringState(private val packedValue: Long) {

value class SpringState(val packedValue: Long) {

    val displacement: Float

        get() = unpackFloat1(packedValue)
@@ -51,6 +51,10 @@ value class SpringState(private val packedValue: Long) { 
        return currentEnergy <= maxStableEnergy

    }



    fun addDisplacement(displacementDelta: Float): SpringState {

        return SpringState(displacement + displacementDelta, velocity)

    }



    override fun toString(): String {

        return "MechanicsSpringState(displacement=$displacement, velocity=$velocity)"

    }

mechanics/tests/Android.bp

+3 −1
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ package { 
android_test {

    name: "mechanics_tests",

    manifest: "AndroidManifest.xml",

    defaults: ["MotionTestDefaults"],

    test_suites: ["device-tests"],



    srcs: [
@@ -37,8 +38,9 @@ android_test { 
        // ":mechanics_tests" dependencies

        "androidx.compose.animation_animation-core",

        "platform-test-annotations",

        "PlatformMotionTesting",

        "PlatformMotionTestingCompose",

        "androidx.compose.ui_ui-test-junit4",

        "androidx.compose.ui_ui-test-manifest",

        "androidx.test.runner",

        "androidx.test.ext.junit",

        "kotlin-test",

mechanics/tests/AndroidManifest.xml

+0 −4
Original line number Diff line number Diff line
@@ -17,10 +17,6 @@ 
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.android.mechanics.tests">



    <application>

        <uses-library android:name="android.test.runner" />

    </application>



    <instrumentation

        android:name="androidx.test.runner.AndroidJUnitRunner"

        android:label="Tests for Motion Mechanics"