Tweak sizes and padding of various keyboard elements.

app/src/main/java/org/thoughtcrime/securesms/keyboard/emoji/EmojiKeyboardPageFragment.kt

@@ -85,7 +85,7 @@ class EmojiKeyboardPageFragment : Fragment(R.layout.keyboard_pager_emoji_page_fr
     }
 
     viewModel.pages.observe(viewLifecycleOwner) { pages ->
-      emojiPageView.setList(pages)
+      emojiPageView.setList(pages) { (emojiPageView.layoutManager as? LinearLayoutManager)?.scrollToPositionWithOffset(1, 0) }
     }
 
     viewModel.selectedKey.observe(viewLifecycleOwner) { updateCategoryTab(it) }

app/src/main/java/org/thoughtcrime/securesms/keyboard/emoji/search/EmojiSearchFragment.kt

@@ -56,7 +56,7 @@ class EmojiSearchFragment : Fragment(R.layout.emoji_search_fragment), EmojiPageV
     searchBar.callbacks = SearchCallbacks()
 
     viewModel.emojiList.observe(viewLifecycleOwner) { results ->
-      emojiPageView.setList(results.emojiList)
+      emojiPageView.setList(results.emojiList, null)
 
       if (results.emojiList.isNotEmpty() || results.isRecents) {
         emojiPageView.visibility = View.VISIBLE

app/src/main/java/org/thoughtcrime/securesms/keyboard/sticker/StickerInsetSetter.kt

@@ -0,0 +1,25 @@
+package org.thoughtcrime.securesms.keyboard.sticker
+
+import android.graphics.Rect
+import android.view.View
+import androidx.appcompat.widget.AppCompatTextView
+import androidx.recyclerview.widget.RecyclerView
+import org.thoughtcrime.securesms.util.InsetItemDecoration
+import org.thoughtcrime.securesms.util.ViewUtil
+
+private val horizontalInset: Int = ViewUtil.dpToPx(8)
+private val verticalInset: Int = ViewUtil.dpToPx(8)
+
+/**
+ * Set insets for sticker items in a [RecyclerView]. For use in [InsetItemDecoration].
+ */
+class StickerInsetSetter : InsetItemDecoration.SetInset() {
+  override fun setInset(outRect: Rect, view: View, parent: RecyclerView) {
+    val isHeader = view.javaClass == AppCompatTextView::class.java
+
+    outRect.left = horizontalInset
+    outRect.right = horizontalInset
+    outRect.top = verticalInset
+    outRect.bottom = if (isHeader) 0 else verticalInset
+  }
+}

app/src/main/java/org/thoughtcrime/securesms/keyboard/sticker/StickerKeyboardPageFragment.kt

@@ -21,11 +21,14 @@ import org.thoughtcrime.securesms.stickers.StickerEventListener
 import org.thoughtcrime.securesms.stickers.StickerRolloverTouchListener
 import org.thoughtcrime.securesms.stickers.StickerRolloverTouchListener.RolloverStickerRetriever
 import org.thoughtcrime.securesms.util.DeviceProperties
+import org.thoughtcrime.securesms.util.InsetItemDecoration
 import org.thoughtcrime.securesms.util.MappingModel
+import org.thoughtcrime.securesms.util.MappingModelList
 import org.thoughtcrime.securesms.util.Throttler
 import org.whispersystems.libsignal.util.Pair
 import java.util.Optional
 import kotlin.math.abs
+import kotlin.math.max
 
 class StickerKeyboardPageFragment :
   LoggingFragment(R.layout.keyboard_pager_sticker_page_fragment),
@@ -48,6 +51,7 @@ class StickerKeyboardPageFragment :
   private val packIdSelectionOnScroll: UpdatePackSelectionOnScroll = UpdatePackSelectionOnScroll()
   private val observerThrottler: Throttler = Throttler(500)
   private val stickerThrottler: Throttler = Throttler(100)
+  private var firstLoad: Boolean = true
 
   override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
     super.onViewCreated(view, savedInstanceState)
@@ -72,6 +76,7 @@ class StickerKeyboardPageFragment :
     stickerList.adapter = stickerListAdapter
     stickerList.addOnItemTouchListener(listTouchListener)
     stickerList.addOnScrollListener(packIdSelectionOnScroll)
+    stickerList.addItemDecoration(InsetItemDecoration(StickerInsetSetter()))
 
     stickerPacksRecycler = view.findViewById(R.id.sticker_packs_recycler)
 
@@ -106,13 +111,22 @@ class StickerKeyboardPageFragment :
     viewModel = ViewModelProviders.of(requireActivity(), StickerKeyboardPageViewModel.Factory(requireContext()))
       .get(StickerKeyboardPageViewModel::class.java)
 
-    viewModel.stickers.observe(viewLifecycleOwner, stickerListAdapter::submitList)
+    viewModel.stickers.observe(viewLifecycleOwner, this::updateStickerList)
     viewModel.packs.observe(viewLifecycleOwner, stickerPacksAdapter::submitList)
     viewModel.getSelectedPack().observe(viewLifecycleOwner, this::updateCategoryTab)
 
     viewModel.refreshStickers()
   }
 
+  private fun updateStickerList(stickers: MappingModelList) {
+    if (firstLoad) {
+      stickerListAdapter.submitList(stickers) { layoutManager.scrollToPositionWithOffset(1, 0) }
+      firstLoad = false
+    } else {
+      stickerListAdapter.submitList(stickers)
+    }
+  }
+
   private fun onTabSelected(stickerPack: KeyboardStickerPackListAdapter.StickerPack) {
     scrollTo(stickerPack.packRecord.packId)
     viewModel.selectPack(stickerPack.packRecord.packId)
@@ -188,9 +202,8 @@ class StickerKeyboardPageFragment :
   }
 
   private fun calculateColumnCount(@Px screenWidth: Int): Int {
-    val modifier = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_padding).toFloat()
-    val divisor = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_divisor).toFloat()
-    return ((screenWidth - modifier) / divisor).toInt()
+    val divisor = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_width).toFloat() + resources.getDimensionPixelOffset(R.dimen.sticker_page_item_padding).toFloat()
+    return max(1, (screenWidth / divisor).toInt())
   }
 
   private inner class UpdatePackSelectionOnScroll : RecyclerView.OnScrollListener() {

app/src/main/java/org/thoughtcrime/securesms/keyboard/sticker/StickerSearchDialogFragment.kt

@@ -16,7 +16,9 @@ import org.thoughtcrime.securesms.keyboard.findListener
 import org.thoughtcrime.securesms.mms.GlideApp
 import org.thoughtcrime.securesms.stickers.StickerEventListener
 import org.thoughtcrime.securesms.util.DeviceProperties
+import org.thoughtcrime.securesms.util.InsetItemDecoration
 import org.thoughtcrime.securesms.util.ViewUtil
+import kotlin.math.max
 
 /**
  * Search dialog for finding stickers.
@@ -50,6 +52,7 @@ class StickerSearchDialogFragment : DialogFragment(), KeyboardStickerListAdapter
 
     list.layoutManager = layoutManager
     list.adapter = adapter
+    list.addItemDecoration(InsetItemDecoration(StickerInsetSetter()))
 
     val viewModel: StickerSearchViewModel = ViewModelProviders.of(this, StickerSearchViewModel.Factory(requireContext())).get(StickerSearchViewModel::class.java)
 
@@ -80,9 +83,8 @@ class StickerSearchDialogFragment : DialogFragment(), KeyboardStickerListAdapter
   }
 
   private fun calculateColumnCount(@Px screenWidth: Int): Int {
-    val modifier = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_padding).toFloat()
-    val divisor = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_divisor).toFloat()
-    return ((screenWidth - modifier) / divisor).toInt()
+    val divisor = resources.getDimensionPixelOffset(R.dimen.sticker_page_item_width).toFloat() + resources.getDimensionPixelOffset(R.dimen.sticker_page_item_padding).toFloat()
+    return max(1, (screenWidth / divisor).toInt())
   }
 
   override fun onStickerClicked(sticker: KeyboardStickerListAdapter.Sticker) {