From dea42ae4e5794a0d478e93f630ef1d71e04cf7f5 Mon Sep 17 00:00:00 2001
From: Michael Bogdanov <mikhael.bogdanov@gmail.com>
Date: Wed, 29 May 2024 14:31:14 +0200
Subject: [PATCH] Initial support of fling animation

---
 orion-viewer/build.gradle                     |  1 +
 .../viewer/selection/NewTouchProcessor.kt     | 59 ++++++++++++++++++-
 .../orion/viewer/view/OrionDrawScene.kt       |  3 +
 3 files changed, 61 insertions(+), 2 deletions(-)

diff --git a/orion-viewer/build.gradle b/orion-viewer/build.gradle
index 4cc0d80e9..fdb15973e 100644
--- a/orion-viewer/build.gradle
+++ b/orion-viewer/build.gradle
@@ -42,6 +42,7 @@ dependencies {
     implementation "androidx.multidex:multidex:2.0.1"
     implementation 'androidx.navigation:navigation-fragment-ktx:2.7.7'
     implementation 'androidx.navigation:navigation-ui-ktx:2.7.7'
+    implementation 'androidx.dynamicanimation:dynamicanimation:1.0.0'
 
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
     androidTestImplementation 'androidx.test:core:1.5.0'
diff --git a/orion-viewer/src/main/java/universe/constellation/orion/viewer/selection/NewTouchProcessor.kt b/orion-viewer/src/main/java/universe/constellation/orion/viewer/selection/NewTouchProcessor.kt
index a41f57324..2e4cd5503 100644
--- a/orion-viewer/src/main/java/universe/constellation/orion/viewer/selection/NewTouchProcessor.kt
+++ b/orion-viewer/src/main/java/universe/constellation/orion/viewer/selection/NewTouchProcessor.kt
@@ -1,10 +1,14 @@
 package universe.constellation.orion.viewer.selection
 
 import android.graphics.Point
-import androidx.core.view.GestureDetectorCompat
 import android.view.GestureDetector
 import android.view.MotionEvent
-import universe.constellation.orion.viewer.*
+import android.view.View
+import androidx.core.view.GestureDetectorCompat
+import androidx.dynamicanimation.animation.FlingAnimation
+import androidx.dynamicanimation.animation.FloatPropertyCompat
+import universe.constellation.orion.viewer.OrionViewerActivity
+import universe.constellation.orion.viewer.log
 import universe.constellation.orion.viewer.view.OrionDrawScene
 
 enum class State {
@@ -16,6 +20,29 @@ enum class State {
 
 open class NewTouchProcessor(val view: OrionDrawScene, val activity: OrionViewerActivity) : GestureDetector.SimpleOnGestureListener() {
 
+    val property = object : FloatPropertyCompat<View>("doScroll") {
+        var prevValue = 0f
+
+        override fun getValue(view2: View): Float {
+            return prevValue
+        }
+
+        override fun setValue(view2: View, value: Float) {
+            val delta = prevValue - value
+            view.pageLayoutManager?.doScroll(0f, 0f, 0f, -delta)
+            prevValue = value
+        }
+    }
+
+    private val flingAnim =
+        FlingAnimation(
+            view,
+            property
+        )
+            .setMinValue(-20000f)
+            .setFriction(0.5f)
+            .setMaxValue(20000f)
+
     private val detector = GestureDetectorCompat(activity, this)
 
     protected var state = State.UNDEFINED
@@ -27,6 +54,8 @@ open class NewTouchProcessor(val view: OrionDrawScene, val activity: OrionViewer
     private val start0 = Point()
     private val last0 = Point()
 
+    private var isFlingActiveOnDown = false
+
     init {
         detector.setIsLongpressEnabled(true)
         detector.setOnDoubleTapListener(this)
@@ -74,10 +103,28 @@ open class NewTouchProcessor(val view: OrionDrawScene, val activity: OrionViewer
     }
 
     override fun onDown(e: MotionEvent): Boolean {
+        isFlingActiveOnDown = flingAnim.isRunning
+        if (isFlingActiveOnDown) {
+            flingAnim.cancel()
+        }
+
         log("onDown")
         return true
     }
 
+    override fun onFling(
+        e1: MotionEvent?,
+        e2: MotionEvent,
+        velocityX: Float,
+        velocityY: Float
+    ): Boolean {
+        println("onFlingX $velocityY")
+        flingAnim.cancel()
+        flingAnim.setStartVelocity(velocityY)
+        flingAnim.start()
+        return true
+    }
+
     override fun onScroll(e1: MotionEvent?, e2: MotionEvent, distanceX: Float, distanceY: Float): Boolean {
         println("onScroll $enableTouchMove")
         if (!enableTouchMove) {
@@ -89,6 +136,10 @@ open class NewTouchProcessor(val view: OrionDrawScene, val activity: OrionViewer
     }
 
     override fun onSingleTapConfirmed(e: MotionEvent): Boolean {
+        if (isFlingActiveOnDown) {
+            return true
+        }
+
         log("onSingleTapConfirmed")
         resetNextState()
         doAction(e.x.toInt(), e.y.toInt(), false)
@@ -103,6 +154,10 @@ open class NewTouchProcessor(val view: OrionDrawScene, val activity: OrionViewer
     }
 
     override fun onLongPress(e: MotionEvent) {
+        if (isFlingActiveOnDown) {
+            return
+        }
+
         log("onLongPress $state $nextState")
         if (state != State.UNDEFINED) return
         doAction(e.x.toInt(), e.y.toInt(), true)
diff --git a/orion-viewer/src/main/java/universe/constellation/orion/viewer/view/OrionDrawScene.kt b/orion-viewer/src/main/java/universe/constellation/orion/viewer/view/OrionDrawScene.kt
index 20ddfd13d..f34cc45ce 100644
--- a/orion-viewer/src/main/java/universe/constellation/orion/viewer/view/OrionDrawScene.kt
+++ b/orion-viewer/src/main/java/universe/constellation/orion/viewer/view/OrionDrawScene.kt
@@ -26,6 +26,7 @@ import android.graphics.PointF
 import android.graphics.drawable.Drawable
 import android.util.AttributeSet
 import android.view.View
+import android.widget.Scroller
 import universe.constellation.orion.viewer.log
 import universe.constellation.orion.viewer.util.MoveUtil
 
@@ -62,6 +63,8 @@ class OrionDrawScene : View {
 
     lateinit var stuff: ColorStuff
 
+    val scroller = Scroller(context)
+
     constructor(context: Context) : super(context)
 
     constructor(context: Context, attrs: AttributeSet) : super(context, attrs)