Android: Only show divider in settings for headers

4 files changed, 123 insertions, 10 deletions

diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatItem.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatItem.kt
index 55b13a5be5..a02cfa5ae3 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatItem.kt
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatItem.kt
@@ -22,8 +22,8 @@ class CheatItem {
     }
 
     companion object {
-        const val TYPE_CHEAT = 0
-        const val TYPE_HEADER = 1
+        const val TYPE_HEADER = 0
+        const val TYPE_CHEAT = 1
         const val TYPE_ACTION = 2
     }
 }
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatListFragment.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatListFragment.kt
index 093c8c3fbe..c5b7697de2 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatListFragment.kt
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/cheats/ui/CheatListFragment.kt
@@ -13,11 +13,11 @@ import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModelProvider
 import androidx.recyclerview.widget.LinearLayoutManager
 import com.google.android.material.color.MaterialColors
-import com.google.android.material.divider.MaterialDividerItemDecoration
 import com.google.android.material.elevation.ElevationOverlayProvider
 import org.dolphinemu.dolphinemu.R
 import org.dolphinemu.dolphinemu.databinding.FragmentCheatListBinding
 import org.dolphinemu.dolphinemu.features.cheats.model.CheatsViewModel
+import org.dolphinemu.dolphinemu.features.settings.ui.SettingsDividerItemDecoration
 
 class CheatListFragment : Fragment() {
     private var _binding: FragmentCheatListBinding? = null
@@ -39,8 +39,7 @@ class CheatListFragment : Fragment() {
         binding.cheatList.adapter = CheatsAdapter(activity, viewModel)
         binding.cheatList.layoutManager = LinearLayoutManager(activity)
 
-        val divider = MaterialDividerItemDecoration(requireActivity(), LinearLayoutManager.VERTICAL)
-        divider.isLastItemDecorated = false
+        val divider = SettingsDividerItemDecoration(requireActivity())
         binding.cheatList.addItemDecoration(divider)
 
         @ColorInt val color =
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsDividerItemDecoration.kt b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsDividerItemDecoration.kt
new file mode 100644
index 0000000000..571fc00a15
--- /dev/null
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsDividerItemDecoration.kt
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * Partially based on: MaterialDividerItemDecoration
+ *
+ * Copyright (C) 2021 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 org.dolphinemu.dolphinemu.features.settings.ui
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Rect
+import android.graphics.drawable.Drawable
+import android.graphics.drawable.ShapeDrawable
+import android.view.View
+import androidx.annotation.Px
+import androidx.core.content.ContextCompat
+import androidx.core.graphics.drawable.DrawableCompat
+import androidx.recyclerview.widget.RecyclerView
+import androidx.recyclerview.widget.RecyclerView.ItemDecoration
+import org.dolphinemu.dolphinemu.R
+import org.dolphinemu.dolphinemu.features.settings.model.view.SettingsItem
+import kotlin.math.max
+import kotlin.math.roundToInt
+
+class SettingsDividerItemDecoration(context: Context) : ItemDecoration() {
+    private var dividerDrawable: Drawable
+
+    @Px
+    private var dividerThickness: Int
+
+    private val tempRect = Rect()
+
+    init {
+        val attrs = context.obtainStyledAttributes(intArrayOf(R.attr.colorSurfaceVariant))
+        val dividerColor =
+            attrs.getColor(0, ContextCompat.getColor(context, R.color.dolphin_surfaceVariant))
+        attrs.recycle()
+        val shape = ShapeDrawable()
+        dividerThickness = max(context.resources.displayMetrics.density.roundToInt(), 1)
+
+        dividerDrawable = DrawableCompat.wrap(shape)
+        DrawableCompat.setTint(dividerDrawable, dividerColor)
+    }
+
+    private fun isNextViewAHeader(view: View, parent: RecyclerView): Boolean {
+        val index = parent.indexOfChild(view)
+        if (index == parent.childCount - 1) {
+            return false
+        }
+
+        val nextChild = parent.getChildAt(index + 1)
+        val viewHolder = parent.getChildViewHolder(nextChild)
+        // CheatsItem.TYPE_HEADER == SettingsItem.TYPE_HEADER
+        return viewHolder.itemViewType == SettingsItem.TYPE_HEADER
+    }
+
+    override fun onDraw(
+        canvas: Canvas, parent: RecyclerView, state: RecyclerView.State
+    ) {
+        if (parent.layoutManager == null) {
+            return
+        }
+
+        canvas.save()
+        val left: Int
+        val right: Int
+        if (parent.clipToPadding) {
+            left = parent.paddingLeft
+            right = parent.width - parent.paddingRight
+            canvas.clipRect(
+                left, parent.paddingTop, right, parent.height - parent.paddingBottom
+            )
+        } else {
+            left = 0
+            right = parent.width
+        }
+
+        val dividerCount = parent.childCount - 1
+        for (i in 0 until dividerCount) {
+            val child = parent.getChildAt(i)
+
+            if (!isNextViewAHeader(child, parent)) {
+                continue
+            }
+
+            parent.getDecoratedBoundsWithMargins(child, tempRect)
+            // Take into consideration any translationY added to the view.
+            val bottom = tempRect.bottom + child.translationY.roundToInt()
+            val top = bottom - dividerDrawable.intrinsicHeight - dividerThickness
+            dividerDrawable.setBounds(left, top, right, bottom)
+            dividerDrawable.draw(canvas)
+        }
+        canvas.restore()
+    }
+
+    override fun getItemOffsets(
+        outRect: Rect, view: View, parent: RecyclerView, state: RecyclerView.State
+    ) {
+        if (!isNextViewAHeader(view, parent)) {
+            return
+        }
+        outRect.bottom = dividerDrawable.intrinsicHeight + dividerThickness
+    }
+}
diff --git a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragment.java b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragment.java
index 00699e3a0c..81c7321339 100644
--- a/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragment.java
+++ b/Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/ui/SettingsFragment.java
@@ -17,8 +17,6 @@ import androidx.fragment.app.Fragment;
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
-import com.google.android.material.divider.MaterialDividerItemDecoration;
-
 import org.dolphinemu.dolphinemu.R;
 import org.dolphinemu.dolphinemu.databinding.FragmentSettingsBinding;
 import org.dolphinemu.dolphinemu.features.settings.model.Settings;
@@ -146,9 +144,7 @@ public final class SettingsFragment extends Fragment implements SettingsFragment
     recyclerView.setAdapter(mAdapter);
     recyclerView.setLayoutManager(manager);
 
-    MaterialDividerItemDecoration divider =
-            new MaterialDividerItemDecoration(requireActivity(), LinearLayoutManager.VERTICAL);
-    divider.setLastItemDecorated(false);
+    SettingsDividerItemDecoration divider = new SettingsDividerItemDecoration(requireActivity());
     recyclerView.addItemDecoration(divider);
 
     setInsets();