block date animated scroll on date click for better fast clicks

Author: Razeeman

core/src/main/java/com/example/util/simpletimetracker/core/delegates/dateSelector/viewData/DateSelectorScrollViewData.kt

@@ -0,0 +1,6 @@
+package com.example.util.simpletimetracker.core.delegates.dateSelector.viewData
+
+data class DateSelectorScrollViewData(
+    val position: Int,
+    val animate: Boolean,
+)

core/src/main/java/com/example/util/simpletimetracker/core/delegates/dateSelector/viewDelegate/DateSelectorViewDelegate.kt

@@ -89,11 +89,12 @@ object DateSelectorViewDelegate {
         viewModel: DateSelectorViewModelDelegate,
         binding: DateSelectorLayoutBinding,
     ) = with(fragment) {
-        viewModel.dateScrollPosition.observe { position ->
+        viewModel.dateScrollPosition.observe { data ->
             doScrollToPosition(
                 viewHolder = viewHolder,
                 binding = binding,
-                shift = position,
+                shift = data.position,
+                animate = data.animate,
             )
         }
         viewModel.updateDatesViewData.observe {
@@ -164,22 +165,32 @@ object DateSelectorViewDelegate {
         viewHolder: ViewHolder,
         binding: DateSelectorLayoutBinding,
         shift: Int,
+        animate: Boolean,
     ) = with(binding) {
         val actualPosition = viewHolder.adapter.value.toPosition(shift)
-
-        // To long to scroll with animation if scroll distance is long,
-        // in this case scrollToPosition closer, and than smoothScroll with animation.
-        rvDatesContainer.scrollToPosition(actualPosition)
-
-        rvDatesContainer.post {
-            rvDatesContainer.horizontalSmoothScrollWithOffset(
-                snapPreference = LinearSmoothScroller.SNAP_TO_END,
-                position = actualPosition,
-                calculateOffset = { recyclerView, view ->
-                    // center of the recycler.
-                    -recyclerView.width / 2 + view.width / 2
-                },
-            )
+        val layoutManager = rvDatesContainer.layoutManager as? LinearLayoutManager ?: return@with
+
+        if (animate) {
+            // To long to scroll with animation if scroll distance is long,
+            // in this case scrollToPosition closer, and than smoothScroll with animation.
+            rvDatesContainer.scrollToPosition(actualPosition)
+
+            rvDatesContainer.post {
+                rvDatesContainer.horizontalSmoothScrollWithOffset(
+                    snapPreference = LinearSmoothScroller.SNAP_TO_END,
+                    position = actualPosition,
+                    calculateOffset = { recyclerView, view ->
+                        // center of the recycler.
+                        -recyclerView.width / 2 + view.width / 2
+                    },
+                )
+            }
+        } else {
+            rvDatesContainer.post {
+                val view = rvDatesContainer.children.firstOrNull() ?: return@post
+                val offset = rvDatesContainer.width / 2 - view.width / 2
+                layoutManager.scrollToPositionWithOffset(actualPosition, offset)
+            }
         }
     }
 

core/src/main/java/com/example/util/simpletimetracker/core/delegates/dateSelector/viewModelDelegate/DateSelectorViewModelDelegate.kt

@@ -5,6 +5,7 @@ import androidx.lifecycle.MutableLiveData
 import com.example.util.simpletimetracker.core.base.SingleLiveEvent
 import com.example.util.simpletimetracker.core.base.ViewModelDelegate
 import com.example.util.simpletimetracker.core.delegates.dateSelector.mapper.DateSelectorMapper
+import com.example.util.simpletimetracker.core.delegates.dateSelector.viewData.DateSelectorScrollViewData
 import com.example.util.simpletimetracker.core.extension.set
 import com.example.util.simpletimetracker.domain.prefs.interactor.PrefsInteractor
 import com.example.util.simpletimetracker.feature_base_adapter.InfiniteRecyclerAdapter
@@ -15,11 +16,13 @@ class DateSelectorViewModelDelegate @Inject constructor(
     private val prefsInteractor: PrefsInteractor,
 ) : ViewModelDelegate() {
 
-    val dateScrollPosition: LiveData<Int> = SingleLiveEvent<Int>()
+    val dateScrollPosition: LiveData<DateSelectorScrollViewData> =
+        SingleLiveEvent<DateSelectorScrollViewData>()
     val updateDatesViewData: LiveData<Unit> = SingleLiveEvent<Unit>()
     val borderShadowsVisibility: LiveData<Boolean> = MutableLiveData()
 
     private var parent: Parent? = null
+    private var animateScroll: Boolean = true
 
     fun attach(parent: Parent) {
         this.parent = parent
@@ -38,6 +41,7 @@ class DateSelectorViewModelDelegate @Inject constructor(
         if (parent?.currentPosition == item.position) {
             throttle { parent?.onDateClick() }.invoke()
         } else {
+            animateScroll = false
             parent?.updatePosition(item.position)
         }
     }
@@ -59,7 +63,9 @@ class DateSelectorViewModelDelegate @Inject constructor(
     fun updatePosition(shift: Int) {
         dataProvider.currentSelectedPosition = shift
         updateDatesViewData.set(Unit)
-        dateScrollPosition.set(shift)
+        val scrollData = DateSelectorScrollViewData(position = shift, animate = animateScroll)
+        animateScroll = true
+        dateScrollPosition.set(scrollData)
     }
 
     private suspend fun setupDatesSelector() {