/
FrescoBasedReactTextInlineImageSpan.java
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/
FrescoBasedReactTextInlineImageSpan.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.textfrescosupport;
import javax.annotation.Nullable;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.widget.TextView;
import com.facebook.drawee.controller.AbstractDraweeControllerBuilder;
import com.facebook.drawee.generic.GenericDraweeHierarchy;
import com.facebook.drawee.generic.GenericDraweeHierarchyBuilder;
import com.facebook.drawee.interfaces.DraweeController;
import com.facebook.drawee.view.DraweeHolder;
import com.facebook.imagepipeline.request.ImageRequest;
import com.facebook.imagepipeline.request.ImageRequestBuilder;
import com.facebook.react.views.text.TextInlineImageSpan;
/**
* FrescoBasedTextInlineImageSpan is a span for Images that are inside <Text/>. It computes
* its size based on the input size. When it is time to draw, it will use the Fresco framework to
* get the right Drawable and let that draw.
*
* Since Fresco needs to callback to the TextView that contains this, in the ViewManager, you must
* tell the Span about the TextView
*
* Note: It borrows code from DynamicDrawableSpan and if that code updates how it computes size or
* draws, we need to update this as well.
*/
public class FrescoBasedReactTextInlineImageSpan extends TextInlineImageSpan {
private @Nullable Drawable mDrawable;
private final AbstractDraweeControllerBuilder mDraweeControllerBuilder;
private final DraweeHolder<GenericDraweeHierarchy> mDraweeHolder;
private final @Nullable Object mCallerContext;
private int mHeight;
private Uri mUri;
private int mWidth;
private @Nullable TextView mTextView;
public FrescoBasedReactTextInlineImageSpan(
Resources resources,
int height,
int width,
@Nullable Uri uri,
AbstractDraweeControllerBuilder draweeControllerBuilder,
@Nullable Object callerContext) {
mDraweeHolder = new DraweeHolder(
GenericDraweeHierarchyBuilder.newInstance(resources)
.build()
);
mDraweeControllerBuilder = draweeControllerBuilder;
mCallerContext = callerContext;
mHeight = height;
mWidth = width;
mUri = (uri != null) ? uri : Uri.EMPTY;
}
/**
* The ReactTextView that holds this ImageSpan is responsible for passing these methods on so
* that we can do proper lifetime management for Fresco
*/
public void onDetachedFromWindow() {
mDraweeHolder.onDetach();
}
public void onStartTemporaryDetach() {
mDraweeHolder.onDetach();
}
public void onAttachedToWindow() {
mDraweeHolder.onAttach();
}
public void onFinishTemporaryDetach() {
mDraweeHolder.onAttach();
}
public @Nullable Drawable getDrawable() {
return mDrawable;
}
@Override
public int getSize(
Paint paint, CharSequence text, int start, int end, Paint.FontMetricsInt fm) {
// NOTE: This getSize code is copied from DynamicDrawableSpan and modified to not use a Drawable
if (fm != null) {
fm.ascent = -mHeight;
fm.descent = 0;
fm.top = fm.ascent;
fm.bottom = 0;
}
return mWidth;
}
public void setTextView(TextView textView) {
mTextView = textView;
}
@Override
public void draw(
Canvas canvas,
CharSequence text,
int start,
int end,
float x,
int top,
int y,
int bottom,
Paint paint) {
if (mDrawable == null) {
ImageRequest imageRequest = ImageRequestBuilder.newBuilderWithSource(mUri)
.build();
DraweeController draweeController = mDraweeControllerBuilder
.reset()
.setOldController(mDraweeHolder.getController())
.setCallerContext(mCallerContext)
.setImageRequest(imageRequest)
.build();
mDraweeHolder.setController(draweeController);
mDrawable = mDraweeHolder.getTopLevelDrawable();
mDrawable.setBounds(0, 0, mWidth, mHeight);
mDrawable.setCallback(mTextView);
}
// NOTE: This drawing code is copied from DynamicDrawableSpan
canvas.save();
int transY = bottom - mDrawable.getBounds().bottom;
// Align to baseline by default
transY -= paint.getFontMetricsInt().descent;
canvas.translate(x, transY);
mDrawable.draw(canvas);
canvas.restore();
}
}