layouting improvements

app/src/main/kotlin/com/kroegerama/reswista/ui/AcMain.kt

@@ -2,8 +2,10 @@ package com.kroegerama.reswista.ui
 
 import androidx.activity.viewModels
 import androidx.navigation.fragment.NavHostFragment
+import androidx.navigation.navOptions
 import androidx.navigation.ui.setupWithNavController
 import com.kroegerama.kaiteki.baseui.ViewBindingActivity
+import com.kroegerama.kaiteki.onClick
 import com.kroegerama.reswista.R
 import com.kroegerama.reswista.controller.Persistence
 import com.kroegerama.reswista.databinding.AcMainBinding
@@ -27,5 +29,9 @@ class AcMain : ViewBindingActivity<AcMainBinding>(AcMainBinding::inflate) {
         val navController = (supportFragmentManager.findFragmentById(R.id.navHost) as NavHostFragment).navController
         setSupportActionBar(toolbar)
         toolbar.setupWithNavController(navController)
+
+        btnSwitchFrag.onClick {
+            navController.navigate(R.id.fragStart)//, null, navOptions { popUpTo(R.id.main_nav) { inclusive = true } })
+        }
     }
 }

app/src/main/kotlin/com/kroegerama/reswista/ui/FragStart.kt

@@ -5,8 +5,10 @@ import android.graphics.Color
 import androidx.fragment.app.activityViewModels
 import androidx.recyclerview.widget.ConcatAdapter
 import androidx.recyclerview.widget.RecyclerView
+import com.google.android.material.transition.MaterialFadeThrough
 import com.kroegerama.kaiteki.baseui.ViewBindingFragment
 import com.kroegerama.kaiteki.onClick
+import com.kroegerama.kaiteki.postponeUntilLayout
 import com.kroegerama.kaiteki.recyclerview.ViewBindingBaseViewHolder
 import com.kroegerama.reswista.R
 import com.kroegerama.reswista.StackDirection
@@ -28,7 +30,14 @@ class FragStart : ViewBindingFragment<FragStartBinding>(
 
     private val itemAdapter by lazy { ItemAdapter() }
 
+    override fun prepare() {
+        enterTransition = MaterialFadeThrough()
+        exitTransition = MaterialFadeThrough()
+    }
+
     override fun FragStartBinding.setupGUI() {
+        postponeUntilLayout(recycler)
+
         val config = SwiperConfig(
             showCount = 5,
             swipeDirections = SwipeDirection.LEFT or SwipeDirection.RIGHT or SwipeDirection.UP,
@@ -58,7 +67,7 @@ class FragStart : ViewBindingFragment<FragStartBinding>(
         val startColor = requireContext().getColor(R.color.primary)
         val endColor = requireContext().getColor(R.color.secondary)
         val evaluator = ArgbEvaluator()
-        val count = 10
+        val count = 3
 
         fun getColor(pos: Int): Int {
             val fraction = (pos - 1f) / count

app/src/main/res/layout/ac_main.xml

@@ -17,8 +17,15 @@
         android:id="@+id/navHost"
         android:name="androidx.navigation.fragment.NavHostFragment"
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
         app:defaultNavHost="true"
         app:navGraph="@navigation/main_nav" />
 
+    <com.google.android.material.button.MaterialButton
+        android:id="@+id/btnSwitchFrag"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal" />
+
 </LinearLayout>

buildSrc/src/main/kotlin/ProjectInfo.kt

@@ -1,5 +1,5 @@
 object P {
-    const val projectVersion = "0.9.2"
+    const val projectVersion = "0.9.3"
 
     const val projectGroupId = "com.kroegerama"
     const val libraryArtifactId = "recycler-swipe-stack"

library/src/main/kotlin/com/kroegerama/reswista/StackLayoutManager.kt

@@ -4,22 +4,26 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import com.kroegerama.kaiteki.scale
+import timber.log.Timber
 
 class StackLayoutManager(
     private val config: SwiperConfig = SwiperConfig()
 ) : RecyclerView.LayoutManager() {
 
     override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams =
-        RecyclerView.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT)
+        RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
 
     override fun onLayoutChildren(recycler: RecyclerView.Recycler, state: RecyclerView.State) {
         detachAndScrapAttachedViews(recycler)
         val showCount = config.showCount
 
+        val itemCount = state.itemCount
+
         if (itemCount > showCount) {
             for (pos in showCount downTo 0) {
                 val layout = recycler.getViewForPosition(pos)
                 addAndMeasureView(layout)
+                layout.translationZ = (-pos).toFloat()
 
                 when {
                     pos == showCount -> {
@@ -37,6 +41,7 @@ class StackLayoutManager(
             for (pos in itemCount - 1 downTo 0) {
                 val layout = recycler.getViewForPosition(pos)
                 addAndMeasureView(layout)
+                layout.translationZ = (-pos).toFloat()
 
                 when {
                     pos > 0 -> {
@@ -66,15 +71,23 @@ class StackLayoutManager(
     }
 
     private fun View.resetTransitions() {
-        clearAnimation()
         scale(1f)
         translationX = 0f
         translationY = 0f
-        animate().alpha(1f)
     }
 
     private fun View.scaleAndTranslateForPosition(pos: Int) {
-        clearAnimation()
+        scale(1f - pos * config.itemScale)
+        val itemTranslate = config.itemTranslate
+        when (config.stackDirection) {
+            StackDirection.Left -> translationX = -pos * measuredWidth * itemTranslate
+            StackDirection.Up -> translationY = -pos * measuredHeight * itemTranslate
+            StackDirection.Right -> translationX = pos * measuredWidth * itemTranslate
+            StackDirection.Down -> translationY = pos * measuredHeight * itemTranslate
+        }
+    }
+
+    private fun View.scaleAndTranslateForPositionAnimated(pos: Int) {
         animate().apply {
             val scale = 1f - pos * config.itemScale
             scaleX(scale)

library/src/main/kotlin/com/kroegerama/reswista/Utils.kt

@@ -8,7 +8,6 @@ fun RecyclerView.setupStack(
     listener: SwipeListener,
     block: (RecyclerView.() -> Unit)? = null
 ) {
-    itemAnimator = null
     layoutManager = StackLayoutManager(config)
     ItemTouchHelper(StackSwipeTouchHelperCallback(listener, config)).attachToRecyclerView(this)
     block?.invoke(this)