From fb2d072ef47f806238968a9bc73fc7972d1c6bbc Mon Sep 17 00:00:00 2001
From: Damyan Ivanov <dam+mobileledger@ktnx.net>
Date: Tue, 2 Mar 2021 23:12:27 +0200
Subject: [PATCH] add divider before fallback templates

---
 .../ui/templates/TemplateViewHolder.java      |  86 +++++++++------
 .../TemplatesRecyclerViewAdapter.java         | 103 +++++++++++++++---
 .../layout/template_list_template_item.xml    |   2 +-
 .../res/layout/templates_fallback_divider.xml |  52 +++++++++
 app/src/main/res/values-bg/strings.xml        |   1 +
 app/src/main/res/values/strings.xml           |   1 +
 6 files changed, 195 insertions(+), 50 deletions(-)
 create mode 100644 app/src/main/res/layout/templates_fallback_divider.xml

diff --git a/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplateViewHolder.java b/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplateViewHolder.java
index c8c197f4..aeb1dc13 100644
--- a/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplateViewHolder.java
+++ b/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplateViewHolder.java
@@ -17,46 +17,68 @@
 
 package net.ktnx.mobileledger.ui.templates;
 
+import android.view.View;
+
 import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
 import androidx.recyclerview.widget.RecyclerView;
 
 import net.ktnx.mobileledger.R;
 import net.ktnx.mobileledger.databinding.TemplateListTemplateItemBinding;
+import net.ktnx.mobileledger.databinding.TemplatesFallbackDividerBinding;
 import net.ktnx.mobileledger.db.TemplateHeader;
 
-class TemplateViewHolder extends RecyclerView.ViewHolder {
-    final TemplateListTemplateItemBinding b;
-    public TemplateViewHolder(@NonNull TemplateListTemplateItemBinding binding) {
-        super(binding.getRoot());
-        b = binding;
+abstract class BaseTemplateViewHolder extends RecyclerView.ViewHolder {
+    public BaseTemplateViewHolder(@NonNull View itemView) {
+        super(itemView);
+    }
+    abstract void bindToItem(TemplatesRecyclerViewAdapter.BaseTemplateItem item);
+    static class TemplateDividerViewHolder extends BaseTemplateViewHolder {
+        public TemplateDividerViewHolder(@NonNull TemplatesFallbackDividerBinding binding) {
+            super(binding.getRoot());
+        }
+        @Override
+        void bindToItem(TemplatesRecyclerViewAdapter.BaseTemplateItem item) {
+            // nothing
+        }
     }
-    public void bindToItem(TemplateHeader item) {
-        b.templateName.setText(item.getName());
-        b.templateName.setOnClickListener(
-                v -> ((TemplatesActivity) v.getContext()).onEditTemplate(item.getId()));
-        b.templateName.setOnLongClickListener((v) -> {
-            TemplatesActivity activity = (TemplatesActivity) v.getContext();
-            AlertDialog.Builder builder = new AlertDialog.Builder(activity);
-            final String templateName = item.getName();
-            builder.setTitle(templateName);
-            builder.setItems(R.array.templates_ctx_menu, (dialog, which) -> {
-                if (which == 0) { // edit
-                    activity.onEditTemplate(item.getId());
-                }
-                else if (which == 1) { // duplicate
-                    activity.onDuplicateTemplate(item.getId());
-                }
-                else if (which == 2) { // delete
-                    activity.onDeleteTemplate(item.getId());
-                }
-                else {
-                    throw new RuntimeException(String.format("Unknown menu item id (%d)", which));
-                }
-                dialog.dismiss();
+
+    static class TemplateViewHolder extends BaseTemplateViewHolder {
+        final TemplateListTemplateItemBinding b;
+        public TemplateViewHolder(@NonNull TemplateListTemplateItemBinding binding) {
+            super(binding.getRoot());
+            b = binding;
+        }
+        @Override
+        public void bindToItem(TemplatesRecyclerViewAdapter.BaseTemplateItem baseItem) {
+            TemplateHeader item = ((TemplatesRecyclerViewAdapter.TemplateItem) baseItem).template;
+            b.templateName.setText(item.getName());
+            b.templateName.setOnClickListener(
+                    v -> ((TemplatesActivity) v.getContext()).onEditTemplate(item.getId()));
+            b.templateName.setOnLongClickListener((v) -> {
+                TemplatesActivity activity = (TemplatesActivity) v.getContext();
+                AlertDialog.Builder builder = new AlertDialog.Builder(activity);
+                final String templateName = item.getName();
+                builder.setTitle(templateName);
+                builder.setItems(R.array.templates_ctx_menu, (dialog, which) -> {
+                    if (which == 0) { // edit
+                        activity.onEditTemplate(item.getId());
+                    }
+                    else if (which == 1) { // duplicate
+                        activity.onDuplicateTemplate(item.getId());
+                    }
+                    else if (which == 2) { // delete
+                        activity.onDeleteTemplate(item.getId());
+                    }
+                    else {
+                        throw new RuntimeException(
+                                String.format("Unknown menu item id (%d)", which));
+                    }
+                    dialog.dismiss();
+                });
+                builder.show();
+                return true;
             });
-            builder.show();
-            return true;
-        });
+        }
     }
-}
+}
\ No newline at end of file
diff --git a/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplatesRecyclerViewAdapter.java b/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplatesRecyclerViewAdapter.java
index 6c1632ea..320adc57 100644
--- a/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplatesRecyclerViewAdapter.java
+++ b/app/src/main/java/net/ktnx/mobileledger/ui/templates/TemplatesRecyclerViewAdapter.java
@@ -26,49 +26,118 @@ import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.RecyclerView;
 
 import net.ktnx.mobileledger.databinding.TemplateListTemplateItemBinding;
+import net.ktnx.mobileledger.databinding.TemplatesFallbackDividerBinding;
 import net.ktnx.mobileledger.db.TemplateHeader;
 
 import org.jetbrains.annotations.NotNull;
 
+import java.util.ArrayList;
 import java.util.List;
 
-public class TemplatesRecyclerViewAdapter extends RecyclerView.Adapter<TemplateViewHolder> {
-    private final AsyncListDiffer<TemplateHeader> listDiffer;
+public class TemplatesRecyclerViewAdapter extends RecyclerView.Adapter<BaseTemplateViewHolder> {
+    private static final int ITEM_TYPE_TEMPLATE = 1;
+    private static final int ITEM_TYPE_DIVIDER = 2;
+    private final AsyncListDiffer<BaseTemplateItem> listDiffer;
+
     public TemplatesRecyclerViewAdapter() {
-        listDiffer = new AsyncListDiffer<>(this, new DiffUtil.ItemCallback<TemplateHeader>() {
+        listDiffer = new AsyncListDiffer<>(this, new DiffUtil.ItemCallback<BaseTemplateItem>() {
             @Override
-            public boolean areItemsTheSame(@NotNull TemplateHeader oldItem,
-                                           @NotNull TemplateHeader newItem) {
-                return oldItem.getId()
-                              .equals(newItem.getId());
+            public boolean areItemsTheSame(
+                    @NotNull TemplatesRecyclerViewAdapter.BaseTemplateItem oldItem,
+                    @NotNull TemplatesRecyclerViewAdapter.BaseTemplateItem newItem) {
+                return oldItem.getId() == newItem.getId();
             }
             @Override
-            public boolean areContentsTheSame(@NotNull TemplateHeader oldItem,
-                                              @NotNull TemplateHeader newItem) {
+            public boolean areContentsTheSame(
+                    @NotNull TemplatesRecyclerViewAdapter.BaseTemplateItem oldItem,
+                    @NotNull TemplatesRecyclerViewAdapter.BaseTemplateItem newItem) {
                 return oldItem.equals(newItem);
             }
         });
     }
     @NonNull
     @Override
-    public TemplateViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        TemplateListTemplateItemBinding b =
-                TemplateListTemplateItemBinding.inflate(LayoutInflater.from(parent.getContext()),
-                        parent, false);
-
-        return new TemplateViewHolder(b);
+    public BaseTemplateViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
+        switch (viewType) {
+            case ITEM_TYPE_TEMPLATE:
+                TemplateListTemplateItemBinding b =
+                        TemplateListTemplateItemBinding.inflate(inflater, parent, false);
+                return new BaseTemplateViewHolder.TemplateViewHolder(b);
+            case ITEM_TYPE_DIVIDER:
+                return new BaseTemplateViewHolder.TemplateDividerViewHolder(
+                        TemplatesFallbackDividerBinding.inflate(inflater, parent, false));
+            default:
+                throw new RuntimeException("Can't handle " + viewType);
+        }
     }
     @Override
-    public void onBindViewHolder(@NonNull TemplateViewHolder holder, int position) {
+    public void onBindViewHolder(@NonNull BaseTemplateViewHolder holder, int position) {
         holder.bindToItem(listDiffer.getCurrentList()
                                     .get(position));
     }
     @Override
+    public int getItemViewType(int position) {
+        BaseTemplateItem item = getItem(position);
+        if (item instanceof TemplateItem)
+            return ITEM_TYPE_TEMPLATE;
+        if (item instanceof TemplateDivider)
+            return ITEM_TYPE_DIVIDER;
+
+        throw new RuntimeException("Can't handle " + item);
+    }
+    @Override
     public int getItemCount() {
         return listDiffer.getCurrentList()
                          .size();
     }
     public void setTemplates(List<TemplateHeader> newList) {
-        listDiffer.submitList(newList);
+        List<BaseTemplateItem> itemList = new ArrayList<>();
+
+        boolean reachedFallbackItems = false;
+
+        for (TemplateHeader item : newList) {
+            if (!reachedFallbackItems && item.isFallback()) {
+                itemList.add(new TemplateDivider());
+                reachedFallbackItems = true;
+            }
+            itemList.add(new TemplateItem(item));
+        }
+
+        listDiffer.submitList(itemList);
+    }
+    public BaseTemplateItem getItem(int position) {
+        return listDiffer.getCurrentList()
+                         .get(position);
+    }
+
+    static abstract class BaseTemplateItem {
+        abstract long getId();
+
+        abstract boolean equals(BaseTemplateItem other);
+    }
+
+    static class TemplateItem extends BaseTemplateItem {
+        final TemplateHeader template;
+        TemplateItem(TemplateHeader template) {this.template = template;}
+        @Override
+        long getId() {
+            return template.getId();
+        }
+        @Override
+        boolean equals(BaseTemplateItem other) {
+            return template.equals(((TemplateItem) other).template);
+        }
+    }
+
+    static class TemplateDivider extends BaseTemplateItem {
+        @Override
+        long getId() {
+            return -1;
+        }
+        @Override
+        boolean equals(BaseTemplateItem other) {
+            return true;
+        }
     }
 }
diff --git a/app/src/main/res/layout/template_list_template_item.xml b/app/src/main/res/layout/template_list_template_item.xml
index fb5e2431..0c9c21bd 100644
--- a/app/src/main/res/layout/template_list_template_item.xml
+++ b/app/src/main/res/layout/template_list_template_item.xml
@@ -24,7 +24,7 @@
         android:id="@+id/template_name"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:layout_marginStart="@dimen/text_margin"
+        android:layout_marginHorizontal="@dimen/text_margin"
         android:gravity="center_vertical"
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintStart_toStartOf="parent"
diff --git a/app/src/main/res/layout/templates_fallback_divider.xml b/app/src/main/res/layout/templates_fallback_divider.xml
new file mode 100644
index 00000000..acff1962
--- /dev/null
+++ b/app/src/main/res/layout/templates_fallback_divider.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright © 2021 Damyan Ivanov.
+  ~ This file is part of MoLe.
+  ~ MoLe is free software: you can distribute it and/or modify it
+  ~ under the term of the GNU General Public License as published by
+  ~ the Free Software Foundation, either version 3 of the License, or
+  ~ (at your opinion), any later version.
+  ~
+  ~ MoLe is distributed in the hope that it will be useful,
+  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
+  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+  ~ GNU General Public License terms for details.
+  ~
+  ~ You should have received a copy of the GNU General Public License
+  ~ along with MoLe. If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    >
+    <TextView
+        android:id="@+id/top_text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text=" "
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        />
+    <TextView
+        android:id="@+id/label"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="@dimen/text_margin"
+        android:gravity="end"
+        android:text="@string/fallback_templates_divider"
+        android:textStyle="italic"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/divider"
+        />
+    <View
+        android:id="@+id/divider"
+        android:layout_width="0dp"
+        android:layout_height="1dp"
+        android:layout_marginHorizontal="@dimen/text_margin"
+        android:background="?colorPrimary"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/top_text"
+        />
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values-bg/strings.xml b/app/src/main/res/values-bg/strings.xml
index 03806e8a..1c8b51b3 100644
--- a/app/src/main/res/values-bg/strings.xml
+++ b/app/src/main/res/values-bg/strings.xml
@@ -225,4 +225,5 @@
     <string name="template_is_fallback_label">Резервен макет</string>
     <string name="template_is_fallback_yes">Макетът ще се предлага за избор само ако няма друг макет, който да пасва и да не е маркиран като резервен</string>
     <string name="template_is_fallback_no">Макетът не е резервен</string>
+    <string name="fallback_templates_divider">Резервни макети</string>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5713de10..2c478181 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -235,4 +235,5 @@
     <string name="template_is_fallback_label">Fallback template</string>
     <string name="template_is_fallback_yes">Template will be offered for selection only when no templates match that aren\'t marked as fallback templates</string>
     <string name="template_is_fallback_no">Template is a primary, high priority one, not a catch-all</string>
+    <string name="fallback_templates_divider">Fallback templates</string>
 </resources>
-- 
2.39.2