84 lines
2.7 KiB
JavaScript
84 lines
2.7 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule ImageStore
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* @flow
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* @format
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*/
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'use strict';
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const RCTImageStoreManager = require('NativeModules').ImageStoreManager;
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class ImageStore {
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/**
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* Check if the ImageStore contains image data for the specified URI.
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* @platform ios
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*/
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static hasImageForTag(uri: string, callback: (hasImage: boolean) => void) {
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if (RCTImageStoreManager.hasImageForTag) {
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RCTImageStoreManager.hasImageForTag(uri, callback);
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} else {
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console.warn('hasImageForTag() not implemented');
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}
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}
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/**
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* Delete an image from the ImageStore. Images are stored in memory and
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* must be manually removed when you are finished with them, otherwise they
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* will continue to use up RAM until the app is terminated. It is safe to
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* call `removeImageForTag()` without first calling `hasImageForTag()`, it
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* will simply fail silently.
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* @platform ios
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*/
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static removeImageForTag(uri: string) {
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if (RCTImageStoreManager.removeImageForTag) {
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RCTImageStoreManager.removeImageForTag(uri);
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} else {
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console.warn('removeImageForTag() not implemented');
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}
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}
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/**
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* Stores a base64-encoded image in the ImageStore, and returns a URI that
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* can be used to access or display the image later. Images are stored in
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* memory only, and must be manually deleted when you are finished with
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* them by calling `removeImageForTag()`.
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*
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* Note that it is very inefficient to transfer large quantities of binary
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* data between JS and native code, so you should avoid calling this more
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* than necessary.
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* @platform ios
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*/
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static addImageFromBase64(
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base64ImageData: string,
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success: (uri: string) => void,
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failure: (error: any) => void,
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) {
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RCTImageStoreManager.addImageFromBase64(base64ImageData, success, failure);
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}
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/**
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* Retrieves the base64-encoded data for an image in the ImageStore. If the
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* specified URI does not match an image in the store, the failure callback
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* will be called.
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*
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* Note that it is very inefficient to transfer large quantities of binary
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* data between JS and native code, so you should avoid calling this more
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* than necessary. To display an image in the ImageStore, you can just pass
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* the URI to an `<Image/>` component; there is no need to retrieve the
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* base64 data.
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*/
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static getBase64ForTag(
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uri: string,
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success: (base64ImageData: string) => void,
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failure: (error: any) => void,
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) {
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RCTImageStoreManager.getBase64ForTag(uri, success, failure);
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}
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}
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module.exports = ImageStore;
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