Android: Fix handling of line height with inline images

Summary:
This PR was split from a commit originally in facebook#8619. /cc dmmiller

When an inline image was larger than the specified line height,
the image would be clipped. This changes the behavior so
that the line height is changed to make room for the inline
image. This is consistent with the behavior of RN for iOS.

Here's how the change works.

ReactTextView now receives its line height from the layout thread
rather than directly from JavaScript.

The reason is that the layout thread may pick a different line height.
In the case that the tallest inline image is larger than the line
height supplied by JavaScript, we want to use that image's height as
the line height rather than the supplied line height.

Also fixed a bug where the image, which is supposed to be baseline
aligned, would be positioned at the wrong y location. To fix this,
we use `y` (the baseline) in the `draw` method rather than trying
to calculate the baseline from `bottom`. For more information
see https://code.google.com/p/andro
Closes facebook#8907

Differential Revision: D3592781

Pulled By: dmmiller

fbshipit-source-id: cba6cd86eb4e3abef6a0d7a81f802bdb0958492e

Author: Adam Comella

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

@@ -190,12 +190,17 @@ protected static Spannable fromTextCSSNode(ReactTextShadowNode textCSSNode) {
     }
 
     textCSSNode.mContainsImages = false;
+    textCSSNode.mHeightOfTallestInlineImage = Float.NaN;
 
     // While setting the Spans on the final text, we also check whether any of them are images
     for (int i = ops.size() - 1; i >= 0; i--) {
       SetSpanOperation op = ops.get(i);
       if (op.what instanceof TextInlineImageSpan) {
+        int height = ((TextInlineImageSpan)op.what).getHeight();
         textCSSNode.mContainsImages = true;
+        if (Float.isNaN(textCSSNode.mHeightOfTallestInlineImage) || height > textCSSNode.mHeightOfTallestInlineImage) {
+          textCSSNode.mHeightOfTallestInlineImage = height;
+        }
       }
       op.execute(sb);
     }
@@ -226,6 +231,14 @@ public void measure(
           // technically, width should never be negative, but there is currently a bug in
           boolean unconstrainedWidth = widthMode == CSSMeasureMode.UNDEFINED || width < 0;
 
+          float effectiveLineHeight = reactCSSNode.getEffectiveLineHeight();
+          float lineSpacingExtra = 0;
+          float lineSpacingMultiplier = 1;
+          if (!Float.isNaN(effectiveLineHeight)) {
+            lineSpacingExtra = effectiveLineHeight;
+            lineSpacingMultiplier = 0;
+          }
+
           if (boring == null &&
               (unconstrainedWidth ||
                   (!CSSConstants.isUndefined(desiredWidth) && desiredWidth <= width))) {
@@ -236,8 +249,8 @@ public void measure(
                 textPaint,
                 (int) Math.ceil(desiredWidth),
                 Layout.Alignment.ALIGN_NORMAL,
-                1,
-                0,
+                lineSpacingMultiplier,
+                lineSpacingExtra,
                 true);
           } else if (boring != null && (unconstrainedWidth || boring.width <= width)) {
             // Is used for single-line, boring text when the width is either unknown or bigger
@@ -247,8 +260,8 @@ public void measure(
                 textPaint,
                 boring.width,
                 Layout.Alignment.ALIGN_NORMAL,
-                1,
-                0,
+                lineSpacingMultiplier,
+                lineSpacingExtra,
                 boring,
                 true);
           } else {
@@ -258,8 +271,8 @@ public void measure(
                 textPaint,
                 (int) width,
                 Layout.Alignment.ALIGN_NORMAL,
-                1,
-                0,
+                lineSpacingMultiplier,
+                lineSpacingExtra,
                 true);
           }
 
@@ -269,13 +282,6 @@ public void measure(
               reactCSSNode.mNumberOfLines < layout.getLineCount()) {
             measureOutput.height = layout.getLineBottom(reactCSSNode.mNumberOfLines - 1);
           }
-          if (reactCSSNode.mLineHeight != UNSET) {
-            int lines = reactCSSNode.mNumberOfLines != UNSET
-                ? Math.min(reactCSSNode.mNumberOfLines, layout.getLineCount())
-                : layout.getLineCount();
-            float lineHeight = PixelUtil.toPixelFromSP(reactCSSNode.mLineHeight);
-            measureOutput.height = lineHeight * lines;
-          }
         }
       };
 
@@ -293,7 +299,7 @@ private static int parseNumericFontWeight(String fontWeightString) {
         100 * (fontWeightString.charAt(0) - '0') : -1;
   }
 
-  private int mLineHeight = UNSET;
+  private float mLineHeight = Float.NaN;
   private boolean mIsColorSet = false;
   private int mColor;
   private boolean mIsBackgroundColorSet = false;
@@ -340,6 +346,7 @@ private static int parseNumericFontWeight(String fontWeightString) {
   private final boolean mIsVirtual;
 
   protected boolean mContainsImages = false;
+  private float mHeightOfTallestInlineImage = Float.NaN;
 
   public ReactTextShadowNode(boolean isVirtual) {
     mIsVirtual = isVirtual;
@@ -348,6 +355,15 @@ public ReactTextShadowNode(boolean isVirtual) {
     }
   }
 
+  // Returns a line height which takes into account the requested line height
+  // and the height of the inline images.
+  public float getEffectiveLineHeight() {
+    boolean useInlineViewHeight = !Float.isNaN(mLineHeight) &&
+        !Float.isNaN(mHeightOfTallestInlineImage) &&
+        mHeightOfTallestInlineImage > mLineHeight;
+    return useInlineViewHeight ? mHeightOfTallestInlineImage : mLineHeight;
+  }
+
   @Override
   public void onBeforeLayout() {
     if (mIsVirtual) {
@@ -380,7 +396,7 @@ public void setNumberOfLines(int numberOfLines) {
 
   @ReactProp(name = ViewProps.LINE_HEIGHT, defaultInt = UNSET)
   public void setLineHeight(int lineHeight) {
-    mLineHeight = lineHeight;
+    mLineHeight = lineHeight == UNSET ? Float.NaN : PixelUtil.toPixelFromSP(lineHeight);
     markUpdated();
   }
 
@@ -530,7 +546,7 @@ public void onCollectExtraUpdates(UIViewOperationQueue uiViewOperationQueue) {
     super.onCollectExtraUpdates(uiViewOperationQueue);
     if (mPreparedSpannableText != null) {
       ReactTextUpdate reactTextUpdate =
-          new ReactTextUpdate(mPreparedSpannableText, UNSET, mContainsImages, getPadding());
+          new ReactTextUpdate(mPreparedSpannableText, UNSET, mContainsImages, getPadding(), getEffectiveLineHeight());
       uiViewOperationQueue.enqueueUpdateExtraData(getReactTag(), reactTextUpdate);
     }
   }

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

@@ -27,19 +27,22 @@ public class ReactTextUpdate {
   private final float mPaddingTop;
   private final float mPaddingRight;
   private final float mPaddingBottom;
+  private final float mLineHeight;
 
   public ReactTextUpdate(
     Spannable text,
     int jsEventCounter,
     boolean containsImages,
-    Spacing padding) {
+    Spacing padding,
+    float lineHeight) {
     mText = text;
     mJsEventCounter = jsEventCounter;
     mContainsImages = containsImages;
     mPaddingLeft = padding.get(Spacing.LEFT);
     mPaddingTop = padding.get(Spacing.TOP);
     mPaddingRight = padding.get(Spacing.RIGHT);
     mPaddingBottom = padding.get(Spacing.BOTTOM);
+    mLineHeight = lineHeight;
   }
 
   public Spannable getText() {
@@ -69,4 +72,8 @@ public float getPaddingRight() {
   public float getPaddingBottom() {
     return mPaddingBottom;
   }
+
+  public float getLineHeight() {
+    return mLineHeight;
+  }
 }

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

@@ -17,6 +17,7 @@
 import android.view.ViewGroup;
 import android.widget.TextView;
 
+import com.facebook.csslayout.FloatUtil;
 import com.facebook.react.uimanager.ReactCompoundView;
 
 public class ReactTextView extends TextView implements ReactCompoundView {
@@ -28,6 +29,7 @@ public class ReactTextView extends TextView implements ReactCompoundView {
   private int mDefaultGravityHorizontal;
   private int mDefaultGravityVertical;
   private boolean mTextIsSelectable;
+  private float mLineHeight = Float.NaN;
 
   public ReactTextView(Context context) {
     super(context);
@@ -50,6 +52,16 @@ public void setText(ReactTextUpdate update) {
       (int) Math.ceil(update.getPaddingTop()),
       (int) Math.ceil(update.getPaddingRight()),
       (int) Math.ceil(update.getPaddingBottom()));
+
+    float nextLineHeight = update.getLineHeight();
+    if (!FloatUtil.floatsEqual(mLineHeight, nextLineHeight)) {
+      mLineHeight = nextLineHeight;
+      if (Float.isNaN(mLineHeight)) { // NaN will be used if property gets reset
+        setLineSpacing(0, 1);
+      } else {
+        setLineSpacing(mLineHeight, 0);
+      }
+    }
   }
 
   @Override

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

@@ -103,15 +103,6 @@ public void setTextAlignVertical(ReactTextView view, @Nullable String textAlignV
     }
   }
 
-  @ReactProp(name = ViewProps.LINE_HEIGHT, defaultFloat = Float.NaN)
-  public void setLineHeight(ReactTextView view, float lineHeight) {
-    if (Float.isNaN(lineHeight)) { // NaN will be used if property gets reset
-      view.setLineSpacing(0, 1);
-    } else {
-      view.setLineSpacing(PixelUtil.toPixelFromSP(lineHeight), 0);
-    }
-  }
-
   @ReactProp(name = "selectable")
   public void setSelectable(ReactTextView view, boolean isSelectable) {
     view.setTextIsSelectable(isSelectable);

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

@@ -67,4 +67,14 @@ public static void possiblyUpdateInlineImageSpans(Spannable spannable, TextView
     * Set the textview that will contain this span.
     */
    public abstract void setTextView(TextView textView);
+
+   /**
+    * Get the width of the span.
+    */
+   public abstract int getWidth();
+
+   /**
+    * Get the height of the span.
+    */
+   public abstract int getHeight();
  }

ReactAndroid/src/main/java/com/facebook/react/views/text/frescosupport/FrescoBasedReactTextInlineImageSpan.java

@@ -146,13 +146,21 @@ public void draw(
 
     canvas.save();
 
-    int transY = bottom - mDrawable.getBounds().bottom;
-
     // Align to baseline by default
-    transY -= paint.getFontMetricsInt().descent;
+    int transY = y - mDrawable.getBounds().bottom;
 
     canvas.translate(x, transY);
     mDrawable.draw(canvas);
     canvas.restore();
   }
+
+  @Override
+  public int getWidth() {
+    return mWidth;
+  }
+
+  @Override
+  public int getHeight() {
+    return mHeight;
+  }
 }

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputShadowNode.java

@@ -119,7 +119,7 @@ public void onCollectExtraUpdates(UIViewOperationQueue uiViewOperationQueue) {
     if (mJsEventCount != UNSET) {
       Spannable preparedSpannableText = fromTextCSSNode(this);
       ReactTextUpdate reactTextUpdate =
-          new ReactTextUpdate(preparedSpannableText, mJsEventCount, mContainsImages, getPadding());
+          new ReactTextUpdate(preparedSpannableText, mJsEventCount, mContainsImages, getPadding(), getEffectiveLineHeight());
       uiViewOperationQueue.enqueueUpdateExtraData(getReactTag(), reactTextUpdate);
     }
   }