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64 lines
2.8 KiB
Plaintext
64 lines
2.8 KiB
Plaintext
/*
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* Copyright 2020 Adobe. All rights reserved.
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* This file is licensed to you under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
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* OF ANY KIND, either express or implied. See the License for the specific language
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* governing permissions and limitations under the License.
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*/ let $ad1d98aa8f0c31b4$var$KEY = 0;
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class $ad1d98aa8f0c31b4$export$1a5223887c560441 {
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/**
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* Prepares the view for reuse. Called just before the view is removed from the DOM.
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*/ prepareForReuse() {
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this.content = null;
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this.rendered = null;
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this.layoutInfo = null;
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}
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getReusableView(reuseType) {
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// Reusable view queue should be FIFO so that DOM order remains consistent during scrolling.
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// For example, cells within a row should remain in the same order even if the row changes contents.
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// The cells within a row are removed from their parent in order. If the row is reused, the cells
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// should be reused in the new row in the same order they were before.
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let reusable = this.reusableViews.get(reuseType);
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let view = reusable && reusable.length > 0 ? reusable.shift() : new $ad1d98aa8f0c31b4$export$7a41b6f219e61634(this.virtualizer, this, reuseType);
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return view;
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}
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reuseChild(child) {
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child.prepareForReuse();
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let reusable = this.reusableViews.get(child.viewType);
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if (!reusable) {
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reusable = [];
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this.reusableViews.set(child.viewType, reusable);
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}
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reusable.push(child);
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}
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constructor(virtualizer, viewType){
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this.virtualizer = virtualizer;
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this.key = ++$ad1d98aa8f0c31b4$var$KEY;
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this.viewType = viewType;
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this.children = new Set();
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this.reusableViews = new Map();
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this.layoutInfo = null;
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this.content = null;
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this.rendered = null;
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}
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}
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class $ad1d98aa8f0c31b4$export$e21886a4eef6b29a extends $ad1d98aa8f0c31b4$export$1a5223887c560441 {
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constructor(virtualizer){
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super(virtualizer, 'root');
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}
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}
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class $ad1d98aa8f0c31b4$export$7a41b6f219e61634 extends $ad1d98aa8f0c31b4$export$1a5223887c560441 {
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constructor(virtualizer, parent, viewType){
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super(virtualizer, viewType);
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this.parent = parent;
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}
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}
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export {$ad1d98aa8f0c31b4$export$1a5223887c560441 as ReusableView, $ad1d98aa8f0c31b4$export$7a41b6f219e61634 as ChildView, $ad1d98aa8f0c31b4$export$e21886a4eef6b29a as RootView};
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//# sourceMappingURL=ReusableView.module.js.map
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