mirror of
https://github.com/status-im/react-native.git
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205a35ad37
Summary: public Native view recycling implementation based on limited pools of views. In this diff I introduced new UIManager method: dropViews. Instead of removing views from tag->view maps when they are detached we keep them there until we get a call to dropViews with the appropriate tag. JS may keep a pool of object and selectively decide not to enqueue drop for certain views. Then instead of removing those views it may decide to reuse tag that has been previously allocated for a view that is no longer in use. Special handling is required for layout-only nodes as they only can transition from layout-only to non-layout-only (reverse transition hasn't been implemented). Because of that we'd loose benefits of view flattening if we decide to recycle existing non-layout-only view as a layout-only one. This diff provides only a simple and manual method for configuring pools by calling `ReactNativeViewPool.configure` with a dict from native view name to the view count. Note that we may not want recycle all the views (e.g. when we render mapview we don't want to keep it in memory after it's detached) Reviewed By: davidaurelio Differential Revision: D2677289 fb-gh-sync-id: 29f44ce5b01db3ec353522af051b6a50924614a2
111 lines
2.9 KiB
JavaScript
111 lines
2.9 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule ReactNativeReconcileTransaction
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* @flow
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*/
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'use strict';
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var CallbackQueue = require('CallbackQueue');
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var PooledClass = require('PooledClass');
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var Transaction = require('Transaction');
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var ReactNativeViewPool = require('ReactNativeViewPool');
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/**
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* Provides a `CallbackQueue` queue for collecting `onDOMReady` callbacks during
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* the performing of the transaction.
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*/
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var ON_DOM_READY_QUEUEING = {
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/**
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* Initializes the internal `onDOMReady` queue.
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*/
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initialize: function() {
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this.reactMountReady.reset();
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},
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/**
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* After DOM is flushed, invoke all registered `onDOMReady` callbacks.
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*/
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close: function() {
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this.reactMountReady.notifyAll();
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}
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};
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var RN_VIEW_POOL_WRAPPER = {
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close: function() {
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ReactNativeViewPool.onReconcileTransactionClose();
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},
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};
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/**
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* Executed within the scope of the `Transaction` instance. Consider these as
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* being member methods, but with an implied ordering while being isolated from
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* each other.
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*/
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var TRANSACTION_WRAPPERS = [ON_DOM_READY_QUEUEING, RN_VIEW_POOL_WRAPPER];
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/**
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* Currently:
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* - The order that these are listed in the transaction is critical:
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* - Suppresses events.
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* - Restores selection range.
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*
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* Future:
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* - Restore document/overflow scroll positions that were unintentionally
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* modified via DOM insertions above the top viewport boundary.
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* - Implement/integrate with customized constraint based layout system and keep
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* track of which dimensions must be remeasured.
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*
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* @class ReactNativeReconcileTransaction
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*/
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function ReactNativeReconcileTransaction() {
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this.reinitializeTransaction();
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this.reactMountReady = CallbackQueue.getPooled(null);
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}
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var Mixin = {
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/**
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* @see Transaction
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* @abstract
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* @final
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* @return {array<object>} List of operation wrap proceedures.
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* TODO: convert to array<TransactionWrapper>
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*/
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getTransactionWrappers: function() {
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return TRANSACTION_WRAPPERS;
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},
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/**
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* @return {object} The queue to collect `onDOMReady` callbacks with.
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* TODO: convert to ReactMountReady
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*/
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getReactMountReady: function() {
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return this.reactMountReady;
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},
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/**
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* `PooledClass` looks for this, and will invoke this before allowing this
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* instance to be resused.
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*/
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destructor: function() {
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CallbackQueue.release(this.reactMountReady);
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this.reactMountReady = null;
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}
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};
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Object.assign(
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ReactNativeReconcileTransaction.prototype,
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Transaction.Mixin,
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ReactNativeReconcileTransaction,
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Mixin
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);
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PooledClass.addPoolingTo(ReactNativeReconcileTransaction);
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module.exports = ReactNativeReconcileTransaction;
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