Show emoji-only messages larger

Closes #6531
// FREEBIE

res/layout/conversation_item_received.xml

@@ -75,7 +75,8 @@
                     android:textAppearance="?android:attr/textAppearanceSmall"
                     android:textColor="?conversation_item_received_text_primary_color"
                     android:textColorLink="?conversation_item_received_text_primary_color"
-                    android:textSize="@dimen/conversation_item_body_text_size" />
+                    android:textSize="@dimen/conversation_item_body_text_size"
+                    app:scaleEmojis="true" />
 
             <LinearLayout android:layout_width="wrap_content"
                           android:layout_height="wrap_content"

res/layout/conversation_item_sent.xml

@@ -65,7 +65,8 @@
                     android:textColor="?conversation_item_sent_text_primary_color"
                     android:textColorLink="?conversation_item_sent_text_primary_color"
                     android:textSize="@dimen/conversation_item_body_text_size"
-                    tools:text="Mango pickle lorem ipsum" />
+                    app:scaleEmojis="true"
+                    tools:text="Mango pickle lorem ipsum"/>
 
             <LinearLayout android:layout_width="wrap_content"
                           android:layout_height="wrap_content"

res/values/attrs.xml

@@ -194,5 +194,9 @@
         <attr name="documentForegroundTintColor" format="color" />
         <attr name="documentBackgroundTintColor" format="color" />
     </declare-styleable>
+    
+    <declare-styleable name="EmojiTextView">
+        <attr name="scaleEmojis" format="boolean" />
+    </declare-styleable>
 
 </resources>

src/org/thoughtcrime/securesms/components/emoji/EmojiProvider.java

@@ -26,7 +26,6 @@ import org.thoughtcrime.securesms.components.emoji.parsing.EmojiTree;
 import org.thoughtcrime.securesms.util.FutureTaskListener;
 import org.thoughtcrime.securesms.util.Util;
 
-import java.util.List;
 import java.util.concurrent.ExecutionException;
 
 class EmojiProvider {
@@ -71,10 +70,19 @@ class EmojiProvider {
     }
   }
 
-  @Nullable Spannable emojify(@Nullable CharSequence text, @NonNull TextView tv) {
+  @Nullable EmojiParser.CandidateList getCandidates(@Nullable CharSequence text) {
     if (text == null) return null;
+    return new EmojiParser(emojiTree).findCandidates(text);
+  }
 
-    List<EmojiParser.Candidate> matches = new EmojiParser(emojiTree).findCandidates(text);
+  @Nullable Spannable emojify(@Nullable CharSequence text, @NonNull TextView tv) {
+    return emojify(getCandidates(text), text, tv);
+  }
+
+  @Nullable Spannable emojify(@Nullable EmojiParser.CandidateList matches,
+                              @Nullable CharSequence text,
+                              @NonNull TextView tv) {
+    if (matches == null || text == null) return null;
     SpannableStringBuilder      builder = new SpannableStringBuilder(text);
 
     for (EmojiParser.Candidate candidate : matches) {

src/org/thoughtcrime/securesms/components/emoji/EmojiTextView.java

@@ -1,6 +1,7 @@
 package org.thoughtcrime.securesms.components.emoji;
 
 import android.content.Context;
+import android.content.res.TypedArray;
 import android.graphics.Paint.FontMetricsInt;
 import android.graphics.drawable.Drawable;
 import android.support.annotation.NonNull;
@@ -9,12 +10,18 @@ import android.support.v7.widget.AppCompatTextView;
 import android.text.TextUtils;
 import android.text.TextUtils.TruncateAt;
 import android.util.AttributeSet;
+import android.util.TypedValue;
 
+import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.components.emoji.EmojiProvider.EmojiDrawable;
+import org.thoughtcrime.securesms.components.emoji.parsing.EmojiParser;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
 import org.thoughtcrime.securesms.util.ViewUtil;
 
 public class EmojiTextView extends AppCompatTextView {
+  private final boolean scaleEmojis;
+  private final float   originalFontSize;
+
   private CharSequence source;
   private boolean      needsEllipsizing;
 
@@ -28,15 +35,38 @@ public class EmojiTextView extends AppCompatTextView {
 
   public EmojiTextView(Context context, AttributeSet attrs, int defStyleAttr) {
     super(context, attrs, defStyleAttr);
+
+    TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.EmojiTextView, 0, 0);
+    scaleEmojis = a.getBoolean(R.styleable.EmojiTextView_scaleEmojis, false);
+    a.recycle();
+
+    a = context.obtainStyledAttributes(attrs, new int[]{android.R.attr.textSize});
+    originalFontSize = a.getDimensionPixelSize(0, 0);
+    a.recycle();
   }
 
   @Override public void setText(@Nullable CharSequence text, BufferType type) {
+    EmojiProvider provider = EmojiProvider.getInstance(getContext());
+    EmojiParser.CandidateList candidates = provider.getCandidates(text);
+
+    if (scaleEmojis && candidates != null && candidates.allEmojis) {
+      int emojis = candidates.size();
+      float scale = 1.0f;
+      if (emojis <= 8) scale += 0.25f;
+      if (emojis <= 6) scale += 0.25f;
+      if (emojis <= 4) scale += 0.25f;
+      if (emojis <= 2) scale += 0.25f;
+      setTextSize(TypedValue.COMPLEX_UNIT_PX, getTextSize() * scale);
+    } else if (scaleEmojis) {
+      setTextSize(TypedValue.COMPLEX_UNIT_PX, originalFontSize);
+    }
+
     if (useSystemEmoji()) {
       super.setText(text, type);
       return;
     }
 
-    source = EmojiProvider.getInstance(getContext()).emojify(text, this);
+    source = EmojiProvider.getInstance(getContext()).emojify(candidates, text, this);
     setTextEllipsized(source);
   }
 

src/org/thoughtcrime/securesms/components/emoji/parsing/EmojiParser.java

@@ -24,6 +24,7 @@ package org.thoughtcrime.securesms.components.emoji.parsing;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 
@@ -38,10 +39,12 @@ public class EmojiParser {
     this.emojiTree = emojiTree;
   }
 
-  public @NonNull List<Candidate> findCandidates(@Nullable CharSequence text) {
+  public @NonNull CandidateList findCandidates(@Nullable CharSequence text) {
     List<Candidate> results = new LinkedList<>();
 
-    if (text == null) return results;
+    if (text == null) return new CandidateList(results, false);
+
+    boolean allEmojis = text.length() > 0;
 
     for (int i = 0; i < text.length(); i++) {
       int emojiEnd = getEmojiEndPos(text, i);
@@ -58,10 +61,12 @@ public class EmojiParser {
         results.add(new Candidate(i, emojiEnd, drawInfo));
 
         i = emojiEnd - 1;
+      } else {
+        allEmojis = false;
       }
     }
 
-    return results;
+    return new CandidateList(results, allEmojis);
   }
 
   private int getEmojiEndPos(CharSequence text, int startPos) {
@@ -105,4 +110,23 @@ public class EmojiParser {
     }
   }
 
+  public class CandidateList implements Iterable<Candidate> {
+    public final List<EmojiParser.Candidate> list;
+    public final boolean                     allEmojis;
+
+    public CandidateList(List<EmojiParser.Candidate> candidates, boolean allEmojis) {
+      this.list = candidates;
+      this.allEmojis = allEmojis;
+    }
+
+    public int size() {
+      return list.size();
+    }
+
+    @Override
+    public Iterator<Candidate> iterator() {
+      return list.iterator();
+    }
+  }
+
 }