Custom fonts support added

Reviewed By: andreicoman11

Differential Revision: D2629077

fb-gh-sync-id: 8d647aff13f97d90c5047ad0ddbcae90215ca4ca

Examples/UIExplorer/TextExample.android.js

@@ -160,6 +160,22 @@ var TextExample = React.createClass({
             </View>
           </View>
         </UIExplorerBlock>
+        <UIExplorerBlock title="Custom Fonts">
+          <View style={{flexDirection: 'row', alignItems: 'flex-start'}}>
+            <View style={{flex: 1}}>
+              <Text style={{fontFamily: 'notoserif'}}>
+                NotoSerif Regular
+              </Text>
+              <Text style={{fontFamily: 'notoserif', fontStyle: 'italic', fontWeight: 'bold'}}>
+                NotoSerif Bold Italic
+              </Text>
+              <Text style={{fontFamily: 'notoserif', fontStyle: 'italic'}}>
+                NotoSerif Italic (Missing Font file)
+              </Text>
+            </View>
+          </View>
+        </UIExplorerBlock>
+
         <UIExplorerBlock title="Font Size">
           <Text style={{fontSize: 23}}>
             Size 23

ReactAndroid/src/main/java/com/facebook/react/views/text/CustomStyleSpan.java

@@ -14,40 +14,51 @@
 import java.util.HashMap;
 import java.util.Map;
 
+import android.content.res.AssetManager;
 import android.graphics.Paint;
 import android.graphics.Typeface;
 import android.text.TextPaint;
 import android.text.style.MetricAffectingSpan;
 
 public class CustomStyleSpan extends MetricAffectingSpan {
 
-  // Typeface caching is a bit weird: once a Typeface is created, it cannot be changed, so we need
-  // to cache each font family and each style that they have. Typeface does cache this already in
-  // Typeface.create(Typeface, style) post API 16, but for that you already need a Typeface.
-  // Therefore, here we cache one style for each font family, and let Typeface cache all styles for
-  // that font family. Of course this is not ideal, and especially after adding Typeface loading
-  // from assets, we will need to have our own caching mechanism for all Typeface creation types.
-  // TODO: t6866343 add better Typeface caching
-  private static final Map<String, Typeface> sTypefaceCache = new HashMap<String, Typeface>();
+  /**
+   * A {@link MetricAffectingSpan} that allows to change the style of the displayed font.
+   * CustomStyleSpan will try to load the fontFamily with the right style and weight from the
+   * assets. The custom fonts will have to be located in the res/assets folder of the application.
+   * The supported custom fonts extensions are .ttf and .otf. For each font family the bold,
+   * italic and bold_italic variants are supported. Given a "family" font family the files in the
+   * assets/fonts folder need to be family.ttf(.otf) family_bold.ttf(.otf) family_italic.ttf(.otf)
+   * and family_bold_italic.ttf(.otf). If the right font is not found in the assets folder
+   * CustomStyleSpan will fallback on the most appropriate default typeface depending on the style.
+   * Fonts are retrieved and cached using the {@link ReactFontManager}
+   */
+
+  private final AssetManager mAssetManager;
 
   private final int mStyle;
   private final int mWeight;
   private final @Nullable String mFontFamily;
 
-  public CustomStyleSpan(int fontStyle, int fontWeight, @Nullable String fontFamily) {
+  public CustomStyleSpan(
+      int fontStyle,
+      int fontWeight,
+      @Nullable String fontFamily,
+      AssetManager assetManager) {
     mStyle = fontStyle;
     mWeight = fontWeight;
     mFontFamily = fontFamily;
+    mAssetManager = assetManager;
   }
 
   @Override
   public void updateDrawState(TextPaint ds) {
-    apply(ds, mStyle, mWeight, mFontFamily);
+    apply(ds, mStyle, mWeight, mFontFamily, mAssetManager);
   }
 
   @Override
   public void updateMeasureState(TextPaint paint) {
-    apply(paint, mStyle, mWeight, mFontFamily);
+    apply(paint, mStyle, mWeight, mFontFamily, mAssetManager);
   }
 
   /**
@@ -61,7 +72,7 @@ public int getStyle() {
    * Returns {@link Typeface#NORMAL} or {@link Typeface#BOLD}.
    */
   public int getWeight() {
-    return (mWeight  == ReactTextShadowNode.UNSET ? 0 : mWeight);
+    return (mWeight == ReactTextShadowNode.UNSET ? 0 : mWeight);
   }
 
   /**
@@ -71,7 +82,12 @@ public int getWeight() {
     return mFontFamily;
   }
 
-  private static void apply(Paint paint, int style, int weight, @Nullable String family) {
+  private static void apply(
+      Paint paint,
+      int style,
+      int weight,
+      @Nullable String family,
+      AssetManager assetManager) {
     int oldStyle;
     Typeface typeface = paint.getTypeface();
     if (typeface == null) {
@@ -92,23 +108,14 @@ private static void apply(Paint paint, int style, int weight, @Nullable String f
     }
 
     if (family != null) {
-      typeface = getOrCreateTypeface(family, want);
+      typeface = ReactFontManager.getInstance().getTypeface(family, want, assetManager);
     }
 
     if (typeface != null) {
-      paint.setTypeface(Typeface.create(typeface, want));
+      paint.setTypeface(typeface);
     } else {
       paint.setTypeface(Typeface.defaultFromStyle(want));
     }
   }
 
-  private static Typeface getOrCreateTypeface(String family, int style) {
-    if (sTypefaceCache.get(family) != null) {
-      return sTypefaceCache.get(family);
-    }
-
-    Typeface typeface = Typeface.create(family, style);
-    sTypefaceCache.put(family, typeface);
-    return typeface;
-  }
 }

ReactAndroid/src/main/java/com/facebook/react/views/text/ReactFontManager.java

@@ -0,0 +1,116 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc. All rights reserved.
+ * <p/>
+ * This source code is licensed under the BSD-style license found in the LICENSE file in the root
+ * directory of this source tree. An additional grant of patent rights can be found in the PATENTS
+ * file in the same directory.
+ */
+
+package com.facebook.react.views.text;
+
+import javax.annotation.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import android.content.res.AssetManager;
+import android.graphics.Typeface;
+import android.util.SparseArray;
+
+/**
+ * Class responsible to load and cache Typeface objects. It will first try to load typefaces inside
+ * the assets/fonts folder and if it doesn't find the right Typeface in that folder will fall back
+ * on the best matching system Typeface The supported custom fonts extensions are .ttf and .otf. For
+ * each font family the bold, italic and bold_italic variants are supported. Given a "family" font
+ * family the files in the assets/fonts folder need to be family.ttf(.otf) family_bold.ttf(.otf)
+ * family_italic.ttf(.otf) and family_bold_italic.ttf(.otf)
+ */
+public class ReactFontManager {
+
+  private static final String[] EXTENSIONS = {
+      "",
+      "_bold",
+      "_italic",
+      "_bold_italic"};
+  private static final String[] FILE_EXTENSIONS = {".ttf", ".otf"};
+  private static final String FONTS_ASSET_PATH = "fonts/";
+
+  private static ReactFontManager sReactFontManagerInstance;
+
+  private Map<String, FontFamily> mFontCache;
+
+  private ReactFontManager() {
+    mFontCache = new HashMap<>();
+  }
+
+  public static ReactFontManager getInstance() {
+    if (sReactFontManagerInstance == null) {
+      sReactFontManagerInstance = new ReactFontManager();
+    }
+    return sReactFontManagerInstance;
+  }
+
+  public
+  @Nullable Typeface getTypeface(
+      String fontFamilyName,
+      int style,
+      AssetManager assetManager) {
+    FontFamily fontFamily = mFontCache.get(fontFamilyName);
+    if (fontFamily == null) {
+      fontFamily = new FontFamily();
+      mFontCache.put(fontFamilyName, fontFamily);
+    }
+
+    Typeface typeface = fontFamily.getTypeface(style);
+    if (typeface == null) {
+      typeface = createTypeface(fontFamilyName, style, assetManager);
+      if (typeface != null) {
+        fontFamily.setTypeface(style, typeface);
+      }
+    }
+
+    return typeface;
+  }
+
+  private static
+  @Nullable Typeface createTypeface(
+      String fontFamilyName,
+      int style,
+      AssetManager assetManager) {
+    String extension = EXTENSIONS[style];
+    for (String fileExtension : FILE_EXTENSIONS) {
+      String fileName = new StringBuilder()
+          .append(FONTS_ASSET_PATH)
+          .append(fontFamilyName)
+          .append(extension)
+          .append(fileExtension)
+          .toString();
+      try {
+        return Typeface.createFromAsset(assetManager, fileName);
+      } catch (RuntimeException e) {
+        // unfortunately Typeface.createFromAsset throws an exception instead of returning null
+        // if the typeface doesn't exist
+      }
+    }
+
+    return Typeface.create(fontFamilyName, style);
+  }
+
+  private static class FontFamily {
+
+    private SparseArray<Typeface> mTypefaceSparseArray;
+
+    private FontFamily() {
+      mTypefaceSparseArray = new SparseArray<>(4);
+    }
+
+    public Typeface getTypeface(int style) {
+      return mTypefaceSparseArray.get(style);
+    }
+
+    public void setTypeface(int style, Typeface typeface) {
+      mTypefaceSparseArray.put(style, typeface);
+    }
+
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextShadowNode.java

@@ -43,16 +43,16 @@
 
 /**
  * {@link ReactShadowNode} class for spannable text view.
- *
+ * <p/>
  * This node calculates {@link Spannable} based on subnodes of the same type and passes the
- * resulting object down to textview's shadowview and actual native {@link TextView} instance.
- * It is important to keep in mind that {@link Spannable} is calculated only on layout step, so if
- * there are any text properties that may/should affect the result of {@link Spannable} they should
- * be set in a corresponding {@link ReactTextShadowNode}. Resulting {@link Spannable} object is then
- * then passed as "computedDataFromMeasure" down to shadow and native view.
- *
- * TODO(7255858): Rename *CSSNode to *ShadowView (or sth similar) as it's no longer is used
- * solely for layouting
+ * resulting object down to textview's shadowview and actual native {@link TextView} instance. It is
+ * important to keep in mind that {@link Spannable} is calculated only on layout step, so if there
+ * are any text properties that may/should affect the result of {@link Spannable} they should be set
+ * in a corresponding {@link ReactTextShadowNode}. Resulting {@link Spannable} object is then then
+ * passed as "computedDataFromMeasure" down to shadow and native view.
+ * <p/>
+ * TODO(7255858): Rename *CSSNode to *ShadowView (or sth similar) as it's no longer is used solely
+ * for layouting
  */
 public class ReactTextShadowNode extends LayoutShadowNode {
 
@@ -100,7 +100,7 @@ private static final void buildSpannedFromTextCSSNode(
         buildSpannedFromTextCSSNode((ReactTextShadowNode) child, sb, ops);
       } else {
         throw new IllegalViewOperationException("Unexpected view type nested under text node: "
-            + child.getClass());
+                + child.getClass());
       }
       ((ReactTextShadowNode) child).markUpdateSeen();
     }
@@ -128,7 +128,8 @@ private static final void buildSpannedFromTextCSSNode(
                 new CustomStyleSpan(
                     textCSSNode.mFontStyle,
                     textCSSNode.mFontWeight,
-                    textCSSNode.mFontFamily)));
+                    textCSSNode.mFontFamily,
+                    textCSSNode.getThemedContext().getAssets())));
       }
       ops.add(new SetSpanOperation(start, end, new ReactTagSpan(textCSSNode.getReactTag())));
     }
@@ -197,7 +198,7 @@ public void measure(CSSNode node, float width, MeasureOutput measureOutput) {
                 0,
                 boring,
                 true);
-          } else  {
+          } else {
             // Is used for multiline, boring text and the width is known.
             layout = new StaticLayout(
                 text,