However, it's possible for us to get an extra layout before we've received our setText * call. If this happens before the initial setText call, then getText() will have its default * value which isn't a Spanned and we need to bail out. That's fine because we'll get a * setText followed by a layout later. * *
The cause for the extra early layout is that an ancestor gets transitioned from a * layout-only node to a non layout-only node. */ return; } ReactContext reactContext = getReactContext(); UIManagerModule uiManager = Assertions.assertNotNull(reactContext.getNativeModule(UIManagerModule.class)); Spanned text = (Spanned) getText(); Layout layout = getLayout(); if (layout == null) { // Text layout is calculated during pre-draw phase, so in some cases it can be empty during // layout phase, which usually happens before drawing. // The text layout is created by private {@link assumeLayout} method, which we can try to // invoke directly through reflection or indirectly through some methods that compute it // (e.g. {@link getExtendedPaddingTop}). // It is safer, however, to just early return here, as next measure/layout passes are way more // likely to have the text layout computed. return; } TextInlineViewPlaceholderSpan[] placeholders = text.getSpans(0, text.length(), TextInlineViewPlaceholderSpan.class); int textViewWidth = textViewRight - textViewLeft; int textViewHeight = textViewBottom - textViewTop; for (TextInlineViewPlaceholderSpan placeholder : placeholders) { View child = uiManager.resolveView(placeholder.getReactTag()); int start = text.getSpanStart(placeholder); int line = layout.getLineForOffset(start); boolean isLineTruncated = layout.getEllipsisCount(line) > 0; if ( // This truncation check works well on recent versions of Android (tested on 5.1.1 and // 6.0.1) but not on Android 4.4.4. The reason is that getEllipsisCount is buggy on // Android 4.4.4. Specifically, it incorrectly returns 0 if an inline view is the first // thing to be truncated. (isLineTruncated && start >= layout.getLineStart(line) + layout.getEllipsisStart(line)) || // This truncation check works well on Android 4.4.4 but not on others (e.g. 6.0.1). // On Android 4.4.4, getLineEnd returns the first truncated character whereas on 6.0.1, // it appears to return the position after the last character on the line even if that // character is truncated. line >= mNumberOfLines || start >= layout.getLineEnd(line)) { // On some versions of Android (e.g. 4.4.4, 5.1.1), getPrimaryHorizontal can infinite // loop when called on a character that appears after the ellipsis. Avoid this bug by // special casing the character truncation case. child.setVisibility(View.GONE); } else { int width = placeholder.getWidth(); int height = placeholder.getHeight(); // Calculate if the direction of the placeholder character is Right-To-Left. boolean isRtlChar = layout.isRtlCharAt(start); boolean isRtlParagraph = layout.getParagraphDirection(line) == Layout.DIR_RIGHT_TO_LEFT; int placeholderHorizontalPosition; // There's a bug on Samsung devices where calling getPrimaryHorizontal on // the last offset in the layout will result in an endless loop. Work around // this bug by avoiding getPrimaryHorizontal in that case. if (start == text.length() - 1) { boolean endsWithNewLine = text.length() > 0 && text.charAt(layout.getLineEnd(line) - 1) == '\n'; float lineWidth = endsWithNewLine ? layout.getLineMax(line) : layout.getLineWidth(line); placeholderHorizontalPosition = isRtlParagraph // Equivalent to `layout.getLineLeft(line)` but `getLineLeft` returns incorrect // values when the paragraph is RTL and `setSingleLine(true)`. ? textViewWidth - (int) lineWidth : (int) layout.getLineRight(line) - width; } else { // The direction of the paragraph may not be exactly the direction the string is heading // in at the // position of the placeholder. So, if the direction of the character is the same as the // paragraph // use primary, secondary otherwise. boolean characterAndParagraphDirectionMatch = isRtlParagraph == isRtlChar; placeholderHorizontalPosition = characterAndParagraphDirectionMatch ? (int) layout.getPrimaryHorizontal(start) : (int) layout.getSecondaryHorizontal(start); if (isRtlParagraph) { // Adjust `placeholderHorizontalPosition` to work around an Android bug. // The bug is when the paragraph is RTL and `setSingleLine(true)`, some layout // methods such as `getPrimaryHorizontal`, `getSecondaryHorizontal`, and // `getLineRight` return incorrect values. Their return values seem to be off // by the same number of pixels so subtracting these values cancels out the error. // // The result is equivalent to bugless versions of // `getPrimaryHorizontal`/`getSecondaryHorizontal`. placeholderHorizontalPosition = textViewWidth - ((int) layout.getLineRight(line) - placeholderHorizontalPosition); } if (isRtlChar) { placeholderHorizontalPosition -= width; } } int leftRelativeToTextView = isRtlChar ? placeholderHorizontalPosition + getTotalPaddingRight() : placeholderHorizontalPosition + getTotalPaddingLeft(); int left = textViewLeft + leftRelativeToTextView; // Vertically align the inline view to the baseline of the line of text. int topRelativeToTextView = getTotalPaddingTop() + layout.getLineBaseline(line) - height; int top = textViewTop + topRelativeToTextView; boolean isFullyClipped = textViewWidth <= leftRelativeToTextView || textViewHeight <= topRelativeToTextView; int layoutVisibility = isFullyClipped ? View.GONE : View.VISIBLE; int layoutLeft = left; int layoutTop = top; int layoutRight = left + width; int layoutBottom = top + height; child.setVisibility(layoutVisibility); child.layout(layoutLeft, layoutTop, layoutRight, layoutBottom); } } } @Override protected void onDraw(Canvas canvas) { try (SystraceSection s = new SystraceSection("ReactTextView.onDraw")) { Spannable spanned = getSpanned(); if (mAdjustsFontSizeToFit && spanned != null && mShouldAdjustSpannableFontSize) { mShouldAdjustSpannableFontSize = false; TextLayoutManager.adjustSpannableFontToFit( spanned, getWidth(), YogaMeasureMode.EXACTLY, getHeight(), YogaMeasureMode.EXACTLY, mMinimumFontSize, mNumberOfLines, getIncludeFontPadding(), getBreakStrategy(), getHyphenationFrequency(), // always passing ALIGN_NORMAL here should be fine, since this method doesn't depend on // how exactly lines are aligned, just their width Layout.Alignment.ALIGN_NORMAL, (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) ? -1 : getJustificationMode(), getPaint()); setText(spanned); } if (mOverflow != Overflow.VISIBLE) { BackgroundStyleApplicator.clipToPaddingBox(this, canvas); } super.onDraw(canvas); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { try (SystraceSection s = new SystraceSection("ReactTextView.onMeasure")) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); } } public void setText(ReactTextUpdate update) { try (SystraceSection s = new SystraceSection("ReactTextView.setText(ReactTextUpdate)")) { mContainsImages = update.containsImages(); // Android's TextView crashes when it tries to relayout if LayoutParams are // null; explicitly set the LayoutParams to prevent this crash. See: // https://github.com/facebook/react-native/pull/7011 if (getLayoutParams() == null) { setLayoutParams(EMPTY_LAYOUT_PARAMS); } Spannable spannable = update.getText(); if (mLinkifyMaskType > 0) { Linkify.addLinks(spannable, mLinkifyMaskType); setMovementMethod(LinkMovementMethod.getInstance()); } setText(spannable); float paddingLeft = update.getPaddingLeft(); float paddingTop = update.getPaddingTop(); float paddingRight = update.getPaddingRight(); float paddingBottom = update.getPaddingBottom(); // In Fabric padding is set by the update of Layout Metrics and not as part of the "setText" // operation // TODO T56559197: remove this condition when we migrate 100% to Fabric if (paddingLeft != ReactConstants.UNSET && paddingTop != ReactConstants.UNSET && paddingRight != ReactConstants.UNSET && paddingBottom != ReactConstants.UNSET) { setPadding( (int) Math.floor(paddingLeft), (int) Math.floor(paddingTop), (int) Math.floor(paddingRight), (int) Math.floor(paddingBottom)); } int nextTextAlign = update.getTextAlign(); if (nextTextAlign != getGravityHorizontal()) { setGravityHorizontal(nextTextAlign); } if (getBreakStrategy() != update.getTextBreakStrategy()) { setBreakStrategy(update.getTextBreakStrategy()); } if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { if (getJustificationMode() != update.getJustificationMode()) { setJustificationMode(update.getJustificationMode()); } } // Ensure onLayout is called so the inline views can be repositioned. requestLayout(); } } @Override public int reactTagForTouch(float touchX, float touchY) { CharSequence text = getText(); int target = getId(); int x = (int) touchX; int y = (int) touchY; Layout layout = getLayout(); if (layout == null) { // If the layout is null, the view hasn't been properly laid out yet. Therefore, we can't find // the exact text tag that has been touched, and the correct tag to return is the default one. return target; } int line = layout.getLineForVertical(y); int lineStartX = (int) layout.getLineLeft(line); int lineEndX = (int) layout.getLineRight(line); // TODO(5966918): Consider extending touchable area for text spans by some DP constant if (text instanceof Spanned && x >= lineStartX && x <= lineEndX) { Spanned spannedText = (Spanned) text; int index = -1; try { index = layout.getOffsetForHorizontal(line, x); } catch (ArrayIndexOutOfBoundsException e) { // https://issuetracker.google.com/issues/113348914 FLog.e(ReactConstants.TAG, "Crash in HorizontalMeasurementProvider: " + e.getMessage()); return target; } // We choose the most inner span (shortest) containing character at the given index // if no such span can be found we will send the textview's react id as a touch handler // In case when there are more than one spans with same length we choose the last one // from the spans[] array, since it correspond to the most inner react element ReactTagSpan[] spans = spannedText.getSpans(index, index, ReactTagSpan.class); if (spans != null) { int targetSpanTextLength = text.length(); for (int i = 0; i < spans.length; i++) { int spanStart = spannedText.getSpanStart(spans[i]); int spanEnd = spannedText.getSpanEnd(spans[i]); if (spanEnd >= index && (spanEnd - spanStart) <= targetSpanTextLength) { target = spans[i].getReactTag(); targetSpanTextLength = (spanEnd - spanStart); } } } } return target; } @Override protected boolean verifyDrawable(Drawable drawable) { if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { if (span.getDrawable() == drawable) { return true; } } } return super.verifyDrawable(drawable); } @Override public void invalidateDrawable(Drawable drawable) { if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { if (span.getDrawable() == drawable) { invalidate(); } } } super.invalidateDrawable(drawable); } @Override public void onDetachedFromWindow() { super.onDetachedFromWindow(); if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { span.onDetachedFromWindow(); } } } @Override public void onStartTemporaryDetach() { super.onStartTemporaryDetach(); if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { span.onStartTemporaryDetach(); } } } @Override public void setTextIsSelectable(boolean selectable) { mTextIsSelectable = selectable; super.setTextIsSelectable(selectable); } @Override public void onAttachedToWindow() { super.onAttachedToWindow(); // This is a workaround to ensure the text becomes selectable as it doesn't work if we call // `setTextIsSelectable(true)` directly when setTextIsSelectable was already true. if (mTextIsSelectable) { setTextIsSelectable(false); setTextIsSelectable(true); } else { setTextIsSelectable(false); } if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { span.onAttachedToWindow(); } } } @Override public void onFinishTemporaryDetach() { super.onFinishTemporaryDetach(); if (mContainsImages && getText() instanceof Spanned) { Spanned text = (Spanned) getText(); TextInlineImageSpan[] spans = text.getSpans(0, text.length(), TextInlineImageSpan.class); for (TextInlineImageSpan span : spans) { span.onFinishTemporaryDetach(); } } } @Override public boolean hasOverlappingRendering() { return false; } /* package */ int getGravityHorizontal() { return getGravity() & (Gravity.HORIZONTAL_GRAVITY_MASK | Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK); } /* package */ void setGravityHorizontal(int gravityHorizontal) { if (gravityHorizontal == 0) { gravityHorizontal = DEFAULT_GRAVITY & (Gravity.HORIZONTAL_GRAVITY_MASK | Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK); } setGravity( (getGravity() & ~Gravity.HORIZONTAL_GRAVITY_MASK & ~Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) | gravityHorizontal); } /* package */ void setGravityVertical(int gravityVertical) { if (gravityVertical == 0) { gravityVertical = DEFAULT_GRAVITY & Gravity.VERTICAL_GRAVITY_MASK; } setGravity((getGravity() & ~Gravity.VERTICAL_GRAVITY_MASK) | gravityVertical); } public void setNumberOfLines(int numberOfLines) { mNumberOfLines = numberOfLines == 0 ? ViewDefaults.NUMBER_OF_LINES : numberOfLines; setMaxLines(mNumberOfLines); mShouldAdjustSpannableFontSize = true; } public void setAdjustFontSizeToFit(boolean adjustsFontSizeToFit) { mAdjustsFontSizeToFit = adjustsFontSizeToFit; } public void setFontSize(float fontSize) { mFontSize = mAdjustsFontSizeToFit ? (float) Math.ceil(PixelUtil.toPixelFromSP(fontSize)) : (float) Math.ceil(PixelUtil.toPixelFromDIP(fontSize)); applyTextAttributes(); } public void setMinimumFontSize(float minimumFontSize) { mMinimumFontSize = minimumFontSize; mShouldAdjustSpannableFontSize = true; } @Override public void setIncludeFontPadding(boolean includepad) { super.setIncludeFontPadding(includepad); mShouldAdjustSpannableFontSize = true; } @Override public void setBreakStrategy(int breakStrategy) { super.setBreakStrategy(breakStrategy); mShouldAdjustSpannableFontSize = true; } @Override public void setHyphenationFrequency(int hyphenationFrequency) { super.setHyphenationFrequency(hyphenationFrequency); mShouldAdjustSpannableFontSize = true; } public void setLetterSpacing(float letterSpacing) { if (Float.isNaN(letterSpacing)) { return; } float letterSpacingPixels = PixelUtil.toPixelFromDIP(letterSpacing); // `letterSpacingPixels` and `getEffectiveFontSize` are both in pixels, // yielding an accurate em value. mLetterSpacing = letterSpacingPixels / mFontSize; applyTextAttributes(); } public void setEllipsizeLocation(@Nullable TextUtils.TruncateAt ellipsizeLocation) { mEllipsizeLocation = ellipsizeLocation; } public void updateView() { @Nullable TextUtils.TruncateAt ellipsizeLocation = mNumberOfLines == ViewDefaults.NUMBER_OF_LINES || mAdjustsFontSizeToFit ? null : mEllipsizeLocation; setEllipsize(ellipsizeLocation); } @Override public void setBackgroundColor(int color) { BackgroundStyleApplicator.setBackgroundColor(this, color); } public void setBorderWidth(int position, float width) { BackgroundStyleApplicator.setBorderWidth( this, LogicalEdge.values()[position], PixelUtil.toDIPFromPixel(width)); } public void setBorderColor(int position, @Nullable Integer color) { BackgroundStyleApplicator.setBorderColor(this, LogicalEdge.values()[position], color); } public void setBorderRadius(float borderRadius) { setBorderRadius(borderRadius, BorderRadiusProp.BORDER_RADIUS.ordinal()); } public void setBorderRadius(float borderRadius, int position) { @Nullable LengthPercentage radius = Float.isNaN(borderRadius) ? null : new LengthPercentage( PixelUtil.toDIPFromPixel(borderRadius), LengthPercentageType.POINT); BackgroundStyleApplicator.setBorderRadius(this, BorderRadiusProp.values()[position], radius); } public void setBorderStyle(@Nullable String style) { BackgroundStyleApplicator.setBorderStyle( this, style == null ? null : BorderStyle.fromString(style)); } public void setSpanned(Spannable spanned) { mSpanned = spanned; mShouldAdjustSpannableFontSize = true; } public @Nullable Spannable getSpanned() { return mSpanned; } public void setLinkifyMask(int mask) { mLinkifyMaskType = mask; } @Override protected boolean dispatchHoverEvent(MotionEvent event) { // if this view has an accessibility delegate set, and that delegate supports virtual view // children (used for links), pass the hover event along to it so that touching and holding on // this text will properly move focus to the virtual children. if (ViewCompat.hasAccessibilityDelegate(this)) { AccessibilityDelegateCompat delegate = ViewCompat.getAccessibilityDelegate(this); if (delegate instanceof ExploreByTouchHelper) { return ((ExploreByTouchHelper) delegate).dispatchHoverEvent(event) || super.dispatchHoverEvent(event); } } return super.dispatchHoverEvent(event); } /** * Note that if we have a movement method then we DO NOT forward these events to the accessibility * delegate. This is because the movement method should handle the focus highlighting and * changing. If we don't do this then we have mutliple selections happening at once. We cannot get * rid of movement method since links found by Linkify will not be clickable. Also, putting this * gating in the accessibility delegate itself will break screen reader accessibility more * generally, since we still need to register virtual views. */ @Override public final void onFocusChanged( boolean gainFocus, int direction, @Nullable Rect previouslyFocusedRect) { super.onFocusChanged(gainFocus, direction, previouslyFocusedRect); AccessibilityDelegateCompat accessibilityDelegateCompat = ViewCompat.getAccessibilityDelegate(this); if (accessibilityDelegateCompat != null && accessibilityDelegateCompat instanceof ReactTextViewAccessibilityDelegate && getMovementMethod() == null) { ((ReactTextViewAccessibilityDelegate) accessibilityDelegateCompat) .onFocusChanged(gainFocus, direction, previouslyFocusedRect); } } @Override public boolean dispatchKeyEvent(KeyEvent event) { AccessibilityDelegateCompat accessibilityDelegateCompat = ViewCompat.getAccessibilityDelegate(this); return (accessibilityDelegateCompat != null && getMovementMethod() == null && accessibilityDelegateCompat instanceof ReactTextViewAccessibilityDelegate && ((ReactTextViewAccessibilityDelegate) accessibilityDelegateCompat) .dispatchKeyEvent(event)) || super.dispatchKeyEvent(event); } private void applyTextAttributes() { // Workaround for an issue where text can be cut off with an ellipsis when // using certain font sizes and padding. Sets the provided text size and // letter spacing to ensure consistent rendering and prevent cut-off. if (!Float.isNaN(mFontSize)) { setTextSize(TypedValue.COMPLEX_UNIT_PX, mFontSize); } if (!Float.isNaN(mLetterSpacing)) { super.setLetterSpacing(mLetterSpacing); } } public void setOverflow(@Nullable String overflow) { if (overflow == null) { mOverflow = Overflow.VISIBLE; } else { @Nullable Overflow parsedOverflow = Overflow.fromString(overflow); mOverflow = parsedOverflow == null ? Overflow.VISIBLE : parsedOverflow; } invalidate(); } }