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ReactTextView.java
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ReactTextView.java
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/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* 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 android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Layout;
import android.text.Spanned;
import android.view.Gravity;
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 {
private static final ViewGroup.LayoutParams EMPTY_LAYOUT_PARAMS =
new ViewGroup.LayoutParams(0, 0);
private boolean mContainsImages;
private int mDefaultGravityHorizontal;
private int mDefaultGravityVertical;
private boolean mTextIsSelectable;
private float mLineHeight = Float.NaN;
private int mTextAlign = Gravity.NO_GRAVITY;
public ReactTextView(Context context) {
super(context);
mDefaultGravityHorizontal =
getGravity() & (Gravity.HORIZONTAL_GRAVITY_MASK | Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK);
mDefaultGravityVertical = getGravity() & Gravity.VERTICAL_GRAVITY_MASK;
}
public void setText(ReactTextUpdate update) {
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);
}
setText(update.getText());
setPadding(
(int) Math.ceil(update.getPaddingLeft()),
(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);
}
}
int nextTextAlign = update.getTextAlign();
if (mTextAlign != nextTextAlign) {
mTextAlign = nextTextAlign;
}
setGravityHorizontal(mTextAlign);
}
@Override
public int reactTagForTouch(float touchX, float touchY) {
Spanned text = (Spanned) 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 (x >= lineStartX && x <= lineEndX) {
int index = layout.getOffsetForHorizontal(line, x);
// 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 = text.getSpans(index, index, ReactTagSpan.class);
if (spans != null) {
int targetSpanTextLength = text.length();
for (int i = 0; i < spans.length; i++) {
int spanStart = text.getSpanStart(spans[i]);
int spanEnd = text.getSpanEnd(spans[i]);
if (spanEnd > index && (spanEnd - spanStart) <= targetSpanTextLength) {
target = spans[i].getReactTag();
targetSpanTextLength = (spanEnd - spanStart);
}
}
}
}
return target;
}
@Override
public void setTextIsSelectable(boolean selectable) {
mTextIsSelectable = selectable;
super.setTextIsSelectable(selectable);
}
@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 onAttachedToWindow() {
super.onAttachedToWindow();
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();
}
}
}
/* package */ void setGravityHorizontal(int gravityHorizontal) {
if (gravityHorizontal == 0) {
gravityHorizontal = mDefaultGravityHorizontal;
}
setGravity(
(getGravity() & ~Gravity.HORIZONTAL_GRAVITY_MASK &
~Gravity.RELATIVE_HORIZONTAL_GRAVITY_MASK) | gravityHorizontal);
}
/* package */ void setGravityVertical(int gravityVertical) {
if (gravityVertical == 0) {
gravityVertical = mDefaultGravityVertical;
}
setGravity((getGravity() & ~Gravity.VERTICAL_GRAVITY_MASK) | gravityVertical);
}
}