Fix grid not aligning correctly to keyline

docs/changelog.md

@@ -2,6 +2,14 @@
 
 ## Version 1.3.0
 
+### 1.3.0-alpha02
+
+2024-03-23
+
+#### Bug fixes
+
+- Fixed grids not aligning to the keyline for the last row in some cases. ([#203](https://github.com/rubensousa/DpadRecyclerView/issues/203))
+
 ### 1.3.0-alpha01
 
 2024-03-17

dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/DpadRecyclerViewTest.kt

@@ -196,19 +196,19 @@ abstract class DpadRecyclerViewTest {
         return bounds
     }
 
-    protected fun assertChildBounds(
-        childIndex: Int,
-        bounds: ViewBounds,
-        fromStart: Boolean = true
-    ) {
+    protected fun getChildrenBounds(position: Int): ViewBounds {
+        var bounds: ViewBounds? = null
         onRecyclerView("Assert child bounds") { recyclerView ->
-            val layoutManager = recyclerView.layoutManager!!
-            val view = getChildAt(layoutManager, childIndex, fromStart)
-            assertThat(view.left).isEqualTo(bounds.left)
-            assertThat(view.top).isEqualTo(bounds.top)
-            assertThat(view.right).isEqualTo(bounds.right)
-            assertThat(view.bottom).isEqualTo(bounds.bottom)
+            val viewHolder = recyclerView.findViewHolderForLayoutPosition(position)!!
+            val view = viewHolder.itemView
+            bounds = ViewBounds(
+                left = view.left,
+                top = view.top,
+                right = view.right,
+                bottom = view.bottom
+            )
         }
+        return requireNotNull(bounds) { "View at $position not found" }
     }
 
     protected fun assertChildDecorations(

dpadrecyclerview/src/androidTest/kotlin/com/rubensousa/dpadrecyclerview/test/tests/alignment/GridAlignmentTest.kt

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2022 Rúben Sousa
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.rubensousa.dpadrecyclerview.test.tests.alignment
+
+import androidx.recyclerview.widget.RecyclerView
+import com.google.common.truth.Truth.assertThat
+import com.rubensousa.dpadrecyclerview.ChildAlignment
+import com.rubensousa.dpadrecyclerview.ParentAlignment
+import com.rubensousa.dpadrecyclerview.ParentAlignment.Edge
+import com.rubensousa.dpadrecyclerview.test.TestAdapterConfiguration
+import com.rubensousa.dpadrecyclerview.test.TestLayoutConfiguration
+import com.rubensousa.dpadrecyclerview.test.helpers.getItemViewBounds
+import com.rubensousa.dpadrecyclerview.test.helpers.getRecyclerViewBounds
+import com.rubensousa.dpadrecyclerview.test.helpers.waitForIdleScrollState
+import com.rubensousa.dpadrecyclerview.test.tests.DpadRecyclerViewTest
+import com.rubensousa.dpadrecyclerview.testing.KeyEvents
+import com.rubensousa.dpadrecyclerview.testing.R
+import com.rubensousa.dpadrecyclerview.testing.rules.DisableIdleTimeoutRule
+import org.junit.Rule
+import org.junit.Test
+
+class GridAlignmentTest : DpadRecyclerViewTest() {
+
+    @get:Rule
+    val idleTimeoutRule = DisableIdleTimeoutRule()
+
+    override fun getDefaultAdapterConfiguration(): TestAdapterConfiguration {
+        return super.getDefaultAdapterConfiguration().copy(
+            numberOfItems = 50,
+            itemLayoutId = R.layout.dpadrecyclerview_test_item_grid
+        )
+    }
+
+    override fun getDefaultLayoutConfiguration(): TestLayoutConfiguration {
+        return TestLayoutConfiguration(
+            spans = 5,
+            orientation = RecyclerView.VERTICAL,
+            parentAlignment = ParentAlignment(
+                edge = Edge.NONE,
+                offset = 0,
+                fraction = 0.5f
+            ),
+            childAlignment = ChildAlignment(
+                offset = 0,
+                fraction = 0.5f
+            )
+        )
+    }
+
+    @Test
+    fun testItemInFirstColumnAndLastRowIsAlignedToTheCenter() {
+        launchFragment()
+
+        // given
+        val recyclerViewBounds = getRecyclerViewBounds()
+        val itemViewBounds = getItemViewBounds(position = 0)
+
+        // when
+        repeat(10) {
+            KeyEvents.pressDown()
+            waitForIdleScrollState()
+        }
+
+        // then
+        val bounds = getChildrenBounds(position = 45)
+        assertThat(bounds.top)
+            .isEqualTo(recyclerViewBounds.height() / 2 - itemViewBounds.height() / 2)
+    }
+
+}

dpadrecyclerview/src/main/java/com/rubensousa/dpadrecyclerview/layoutmanager/alignment/LayoutAlignment.kt

@@ -316,6 +316,7 @@ internal class LayoutAlignment(
     }
 
     private fun getAnchor(view: View): Int {
+        updateChildAlignments(view)
         return if (isVertical) {
             getVerticalAnchor(view)
         } else {

gradle.properties

@@ -22,4 +22,4 @@ kotlin.code.style=official
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
 android.enableR8.fullMode=true
-LIBRARY_VERSION=1.3.0-alpha01
+LIBRARY_VERSION=1.3.0-alpha02

mkdocs.yml

@@ -24,7 +24,7 @@ theme:
 
 extra:
   dpadrecyclerview:
-    version: '1.3.0-alpha01'
+    version: '1.3.0-alpha02'
   social:
     - icon: 'fontawesome/brands/github'
       link: 'https://github.com/rubensousa/DpadRecyclerView'