Actually form thread lines properly in the thread view. Closes #57

app/src/main/java/com/keylesspalace/tusky/adapter/ThreadAdapter.java

@@ -15,6 +15,7 @@
 
 package com.keylesspalace.tusky.adapter;
 
+import android.support.annotation.Nullable;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -129,6 +130,15 @@ public class ThreadAdapter extends RecyclerView.Adapter {
         }
     }
 
+    @Nullable
+    public StatusViewData getItem(int position) {
+        if (position != RecyclerView.NO_POSITION && position >= 0 && position < statuses.size()) {
+            return statuses.get(position);
+        } else {
+            return null;
+        }
+    }
+
     public void setMediaPreviewEnabled(boolean enabled) {
         mediaPreviewEnabled = enabled;
     }

app/src/main/java/com/keylesspalace/tusky/util/ViewDataUtils.java

@@ -28,6 +28,7 @@ public final class ViewDataUtils {
                 .setCreatedAt(visibleStatus.createdAt)
                 .setReblogsCount(visibleStatus.reblogsCount)
                 .setFavouritesCount(visibleStatus.favouritesCount)
+                .setInReplyToId(visibleStatus.inReplyToId)
                 .setFavourited(visibleStatus.favourited)
                 .setReblogged(visibleStatus.reblogged)
                 .setIsExpanded(false)

app/src/main/java/com/keylesspalace/tusky/view/ConversationLineItemDecoration.java

@@ -22,32 +22,62 @@ import android.support.v7.widget.RecyclerView;
 import android.view.View;
 
 import com.keylesspalace.tusky.R;
+import com.keylesspalace.tusky.adapter.ThreadAdapter;
+import com.keylesspalace.tusky.viewdata.StatusViewData;
 
 public class ConversationLineItemDecoration extends RecyclerView.ItemDecoration {
-    private final Context mContext;
-    private final Drawable mDivider;
+    private final Context context;
+    private final Drawable divider;
 
     public ConversationLineItemDecoration(Context context, Drawable divider) {
-        mContext = context;
-        mDivider = divider;
+        this.context = context;
+        this.divider = divider;
     }
 
     @Override
     public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {
-        int dividerLeft  = parent.getPaddingLeft() + mContext.getResources().getDimensionPixelSize(R.dimen.status_left_line_margin);
-        int dividerRight = dividerLeft + mDivider.getIntrinsicWidth();
+        int dividerLeft  = parent.getPaddingLeft()
+                + context.getResources().getDimensionPixelSize(R.dimen.status_left_line_margin);
+        int dividerRight = dividerLeft + divider.getIntrinsicWidth();
 
         int childCount   = parent.getChildCount();
-        int avatarMargin = mContext.getResources().getDimensionPixelSize(R.dimen.account_avatar_margin);
+        int avatarMargin = context.getResources()
+                .getDimensionPixelSize(R.dimen.account_avatar_margin);
 
         for (int i = 0; i < childCount; i++) {
             View child = parent.getChildAt(i);
 
-            int dividerTop    = child.getTop() + (i == 0 ? avatarMargin : 0);
-            int dividerBottom = (i == childCount - 1 ? child.getTop() + avatarMargin : child.getBottom());
+            int position = parent.getChildAdapterPosition(child);
+            ThreadAdapter adapter = (ThreadAdapter) parent.getAdapter();
+            StatusViewData current = adapter.getItem(position);
+            int dividerTop, dividerBottom;
+            if (current != null) {
+                StatusViewData above = adapter.getItem(position - 1);
+                if (above != null && above.getId().equals(current.getInReplyToId())) {
+                    dividerTop = child.getTop();
+                } else {
+                    dividerTop = child.getTop() + avatarMargin;
+                }
+                StatusViewData below = adapter.getItem(position + 1);
+                if (below != null && current.getId().equals(below.getInReplyToId())) {
+                    dividerBottom = child.getBottom();
+                } else {
+                    dividerBottom = child.getTop() + avatarMargin;
+                }
+            } else {
+                dividerTop = child.getTop();
+                if (i == 0) {
+                    dividerTop += avatarMargin;
+                }
+                if (i == childCount - 1) {
+                    dividerBottom = child.getTop() + avatarMargin;
+                } else {
+                    dividerBottom = child.getBottom();
+                }
+            }
 
-            mDivider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom);
-            mDivider.draw(c);
+            divider.setBounds(dividerLeft, dividerTop, dividerRight, dividerBottom);
+            divider.draw(c);
         }
     }
 }

app/src/main/java/com/keylesspalace/tusky/viewdata/StatusViewData.java

@@ -33,6 +33,8 @@ public final class StatusViewData {
     private final Date createdAt;
     private final String reblogsCount;
     private final String favouritesCount;
+    @Nullable
+    private final String inReplyToId;
     // I would rather have something else but it would be too much of a rewrite
     @Nullable
     private final Status.Mention[] mentions;
@@ -46,8 +48,9 @@ public final class StatusViewData {
                           String rebloggedAvatar, boolean sensitive, boolean isExpanded,
                           boolean isShowingSensitiveWarning, String userFullName, String nickname,
                           String avatar, Date createdAt, String reblogsCount,
-                          String favouritesCount, Status.Mention[] mentions, String senderId,
-                          boolean rebloggingEnabled, Status.Application application) {
+                          String favouritesCount, String inReplyToId, Status.Mention[] mentions,
+                          String senderId, boolean rebloggingEnabled,
+                          Status.Application application) {
         this.id = id;
         this.content = content;
         this.reblogged = reblogged;
@@ -66,6 +69,7 @@ public final class StatusViewData {
         this.createdAt = createdAt;
         this.reblogsCount = reblogsCount;
         this.favouritesCount = favouritesCount;
+        this.inReplyToId = inReplyToId;
         this.mentions = mentions;
         this.senderId = senderId;
         this.rebloggingEnabled = rebloggingEnabled;
@@ -147,6 +151,11 @@ public final class StatusViewData {
         return favouritesCount;
     }
 
+    @Nullable
+    public String getInReplyToId() {
+        return inReplyToId;
+    }
+
     public String getSenderId() {
         return senderId;
     }
@@ -183,6 +192,7 @@ public final class StatusViewData {
         private Date createdAt;
         private String reblogsCount;
         private String favouritesCount;
+        private String inReplyToId;
         private Status.Mention[] mentions;
         private String senderId;
         private boolean rebloggingEnabled;
@@ -210,6 +220,7 @@ public final class StatusViewData {
             createdAt = new Date(viewData.createdAt.getTime());
             reblogsCount = viewData.reblogsCount;
             favouritesCount = viewData.favouritesCount;
+            inReplyToId = viewData.inReplyToId;
             mentions = viewData.mentions == null ? null : viewData.mentions.clone();
             senderId = viewData.senderId;
             rebloggingEnabled = viewData.rebloggingEnabled;
@@ -306,6 +317,11 @@ public final class StatusViewData {
             return this;
         }
 
+        public Builder setInReplyToId(String inReplyToId) {
+            this.inReplyToId = inReplyToId;
+            return this;
+        }
+
         public Builder setMentions(Status.Mention[] mentions) {
             this.mentions = mentions;
             return this;
@@ -330,8 +346,8 @@ public final class StatusViewData {
             return new StatusViewData(id, content, reblogged, favourited, spoilerText, visibility,
                     attachments, rebloggedByUsername, rebloggedAvatar, isSensitive, isExpanded,
                     isShowingSensitiveContent, userFullName, nickname, avatar, createdAt,
-                    reblogsCount, favouritesCount, mentions, senderId, rebloggingEnabled,
-                    application);
+                    reblogsCount, favouritesCount, inReplyToId, mentions, senderId,
+                    rebloggingEnabled, application);
         }
     }
 }