1 files changed, 49 insertions, 0 deletions
diff --git a/src/com/android/customization/picker/common/ui/view/ItemSpacing.kt b/src/com/android/customization/picker/common/ui/view/ItemSpacing.kt
new file mode 100644
index 00000000..ca689aa2
--- /dev/null
+++ b/src/com/android/customization/picker/common/ui/view/ItemSpacing.kt
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * 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.android.customization.picker.common.ui.view
+
+import android.graphics.Rect
+import androidx.core.view.ViewCompat
+import androidx.recyclerview.widget.RecyclerView
+
+/** Item spacing used by the RecyclerView. */
+class ItemSpacing(
+    private val itemSpacingDp: Int,
+) : RecyclerView.ItemDecoration() {
+    override fun getItemOffsets(outRect: Rect, itemPosition: Int, parent: RecyclerView) {
+        val addSpacingToStart = itemPosition > 0
+        val addSpacingToEnd = itemPosition < (parent.adapter?.itemCount ?: 0) - 1
+        val isRtl = parent.layoutManager?.layoutDirection == ViewCompat.LAYOUT_DIRECTION_RTL
+        val density = parent.context.resources.displayMetrics.density
+        val halfItemSpacingPx = itemSpacingDp.toPx(density) / 2
+        if (!isRtl) {
+            outRect.left = if (addSpacingToStart) halfItemSpacingPx else 0
+            outRect.right = if (addSpacingToEnd) halfItemSpacingPx else 0
+        } else {
+            outRect.left = if (addSpacingToEnd) halfItemSpacingPx else 0
+            outRect.right = if (addSpacingToStart) halfItemSpacingPx else 0
+        }
+    }
+
+    private fun Int.toPx(density: Float): Int {
+        return (this * density).toInt()
+    }
+
+    companion object {
+        const val TAB_ITEM_SPACING_DP = 12
+        const val ITEM_SPACING_DP = 8
+    }
+}