projecte_ionic/node_modules/@ionic/angular/esm5/directives/virtual-scroll/virtual-scroll.js
2022-02-09 18:30:03 +01:00

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20 KiB
JavaScript
Executable file

import * as tslib_1 from "tslib";
import { ChangeDetectionStrategy, Component, ContentChild, ElementRef, EmbeddedViewRef, IterableDiffer, IterableDiffers, NgZone, SimpleChanges, TrackByFunction } from '@angular/core';
import { ProxyCmp } from '../proxies-utils';
import { VirtualFooter } from './virtual-footer';
import { VirtualHeader } from './virtual-header';
import { VirtualItem } from './virtual-item';
var IonVirtualScroll = /** @class */ (function () {
function IonVirtualScroll(z, iterableDiffers, elementRef) {
this.z = z;
this.iterableDiffers = iterableDiffers;
this.refMap = new WeakMap();
this.el = elementRef.nativeElement;
this.el.nodeRender = this.nodeRender.bind(this);
}
IonVirtualScroll.prototype.ngOnChanges = function (changes) {
if (this.trackBy && 'items' in changes) {
// React on virtualScroll changes only once all inputs have been initialized
var value = changes['items'].currentValue;
if (this.differ === undefined && value != null) {
try {
this.differ = this.iterableDiffers.find(value).create(this.trackBy);
}
catch (e) {
throw new Error("Cannot find a differ supporting object '" + value + "'. VirtualScroll only supports binding to Iterables such as Arrays.");
}
}
}
};
IonVirtualScroll.prototype.ngDoCheck = function () {
// and if there actually are changes
var changes = this.differ !== undefined && this.items ? this.differ.diff(this.items) : null;
if (changes === null) {
return;
}
// TODO: optimize
this.checkRange(0);
};
IonVirtualScroll.prototype.nodeRender = function (el, cell, index) {
var _this = this;
return this.z.run(function () {
var node;
if (!el) {
node = _this.itmTmp.viewContainer.createEmbeddedView(_this.getComponent(cell.type), { $implicit: cell.value, index: index }, index);
el = getElement(node);
_this.refMap.set(el, node);
}
else {
node = _this.refMap.get(el);
var ctx = node.context;
ctx.$implicit = cell.value;
ctx.index = cell.index;
}
// run sync change detections
node.detectChanges();
return el;
});
};
IonVirtualScroll.prototype.getComponent = function (type) {
switch (type) {
case 'item': return this.itmTmp.templateRef;
case 'header': return this.hdrTmp.templateRef;
case 'footer': return this.ftrTmp.templateRef;
}
throw new Error('template for virtual item was not provided');
};
IonVirtualScroll.ctorParameters = function () { return [
{ type: NgZone },
{ type: IterableDiffers },
{ type: ElementRef }
]; };
tslib_1.__decorate([
ContentChild(VirtualItem, { static: false })
], IonVirtualScroll.prototype, "itmTmp", void 0);
tslib_1.__decorate([
ContentChild(VirtualHeader, { static: false })
], IonVirtualScroll.prototype, "hdrTmp", void 0);
tslib_1.__decorate([
ContentChild(VirtualFooter, { static: false })
], IonVirtualScroll.prototype, "ftrTmp", void 0);
IonVirtualScroll = tslib_1.__decorate([
ProxyCmp({
inputs: ['approxItemHeight', 'approxHeaderHeight', 'approxFooterHeight', 'headerFn', 'footerFn', 'items', 'itemHeight', 'headerHeight', 'footerHeight'],
methods: ['checkEnd', 'checkRange', 'positionForItem']
}),
Component({
selector: 'ion-virtual-scroll',
template: '<ng-content></ng-content>',
changeDetection: ChangeDetectionStrategy.OnPush,
inputs: [
'approxItemHeight',
'approxHeaderHeight',
'approxFooterHeight',
'headerFn',
'footerFn',
'items',
'itemHeight',
'headerHeight',
'footerHeight',
'trackBy'
]
})
], IonVirtualScroll);
return IonVirtualScroll;
}());
export { IonVirtualScroll };
var getElement = function (view) {
var rootNodes = view.rootNodes;
for (var i = 0; i < rootNodes.length; i++) {
if (rootNodes[i].nodeType === 1) {
return rootNodes[i];
}
}
throw new Error('virtual element was not created');
};
var ɵ0 = getElement;
export { ɵ0 };
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This height value can only use `px` units.\n   * Note that the actual rendered size of each cell comes from the\n   * app's CSS, whereas this approximation is used to help calculate\n   * initial dimensions before the item has been rendered.\n   */\n  approxItemHeight: number;\n\n  /**\n   * The approximate height of each header template's cell.\n   * This dimension is used to help determine how many cells should\n   * be created when initialized, and to help calculate the height of\n   * the scrollable area. This height value can only use `px` units.\n   * Note that the actual rendered size of each cell comes from the\n   * app's CSS, whereas this approximation is used to help calculate\n   * initial dimensions before the item has been rendered.\n   */\n  approxHeaderHeight: number;\n\n  /**\n   * The approximate width of each footer template's cell.\n   * This dimension is used to help determine how many cells should\n   * be created when initialized, and to help calculate the height of\n   * the scrollable area. This height value can only use `px` units.\n   * Note that the actual rendered size of each cell comes from the\n   * app's CSS, whereas this approximation is used to help calculate\n   * initial dimensions before the item has been rendered.\n   */\n  approxFooterHeight: number;\n\n  /**\n   * Section headers and the data used within its given\n   * template can be dynamically created by passing a function to `headerFn`.\n   * For example, a large list of contacts usually has dividers between each\n   * letter in the alphabet. App's can provide their own custom `headerFn`\n   * which is called with each record within the dataset. The logic within\n   * the header function can decide if the header template should be used,\n   * and what data to give to the header template. The function must return\n   * `null` if a header cell shouldn't be created.\n   */\n  headerFn?: HeaderFn;\n\n  /**\n   * Section footers and the data used within its given\n   * template can be dynamically created by passing a function to `footerFn`.\n   * The logic within the footer function can decide if the footer template\n   * should be used, and what data to give to the footer template. The function\n   * must return `null` if a footer cell shouldn't be created.\n   */\n  footerFn?: HeaderFn;\n\n  /**\n   * The data that builds the templates within the virtual scroll.\n   * It's important to note that when this data has changed, then the\n   * entire virtual scroll is reset, which is an expensive operation and\n   * should be avoided if possible.\n   */\n  items?: any[] | null;\n\n  /**\n   * An optional function that maps each item within their height.\n   * When this function is provided, heavy optimizations and fast path can be taked by\n   * `ion-virtual-scroll` leading to massive performance improvements.\n   *\n   * This function allows to skip all DOM reads, which can be Doing so leads\n   * to massive performance\n   */\n  itemHeight?: ItemHeightFn;\n\n  /**\n   * An optional function that maps each item header within their height.\n   */\n  headerHeight?: HeaderHeightFn;\n\n  /**\n   * An optional function that maps each item footer within their height.\n   */\n  footerHeight?: FooterHeightFn;\n\n  /**\n   * Same as `ngForTrackBy` which can be used on `ngFor`.\n   */\n  trackBy: TrackByFunction<any>;\n\n  /**\n   * This method marks the tail the items array as dirty, so they can be re-rendered.  It's equivalent to calling:  ```js    * virtualScroll.checkRange(lastItemLen, items.length - lastItemLen);    * ```\n   */\n  'checkEnd': () => void;\n  /**\n   * This method marks a subset of items as dirty, so they can be re-rendered. Items should be marked as dirty any time the content or their style changes.  The subset of items to be updated can are specifing by an offset and a length.\n   */\n  'checkRange': (offset: number, len?: number) => void;\n  /**\n   * Returns the position of the virtual item at the given index.\n   */\n  'positionForItem': (index: number) => Promise<number>;\n}\n\n@ProxyCmp({\n  inputs: ['approxItemHeight', 'approxHeaderHeight', 'approxFooterHeight', 'headerFn', 'footerFn', 'items', 'itemHeight', 'headerHeight', 'footerHeight'],\n  methods: ['checkEnd', 'checkRange', 'positionForItem']\n})\n@Component({\n  selector: 'ion-virtual-scroll',\n  template: '<ng-content></ng-content>',\n  changeDetection: ChangeDetectionStrategy.OnPush,\n  inputs: [\n    'approxItemHeight',\n    'approxHeaderHeight',\n    'approxFooterHeight',\n    'headerFn',\n    'footerFn',\n    'items',\n    'itemHeight',\n    'headerHeight',\n    'footerHeight',\n    'trackBy'\n  ]\n})\nexport class IonVirtualScroll {\n\n  private differ?: IterableDiffer<any>;\n  private el: HTMLIonVirtualScrollElement;\n  private refMap = new WeakMap<HTMLElement, EmbeddedViewRef<VirtualContext>>();\n\n  @ContentChild(VirtualItem, { static: false }) itmTmp!: VirtualItem;\n  @ContentChild(VirtualHeader, { static: false }) hdrTmp!: VirtualHeader;\n  @ContentChild(VirtualFooter, { static: false }) ftrTmp!: VirtualFooter;\n\n  constructor(\n    private z: NgZone,\n    private iterableDiffers: IterableDiffers,\n    elementRef: ElementRef,\n  ) {\n    this.el = elementRef.nativeElement as HTMLIonVirtualScrollElement;\n    this.el.nodeRender = this.nodeRender.bind(this);\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    if (this.trackBy && 'items' in changes) {\n      // React on virtualScroll changes only once all inputs have been initialized\n      const value = changes['items'].currentValue;\n      if (this.differ === undefined && value != null) {\n        try {\n          this.differ = this.iterableDiffers.find(value).create(this.trackBy);\n        } catch (e) {\n          throw new Error(\n            `Cannot find a differ supporting object '${value}'. VirtualScroll only supports binding to Iterables such as Arrays.`);\n        }\n      }\n    }\n  }\n\n  ngDoCheck() {\n    // and if there actually are changes\n    const changes = this.differ !== undefined && this.items ? this.differ.diff(this.items) : null;\n    if (changes === null) {\n      return;\n    }\n    // TODO: optimize\n    this.checkRange(0);\n  }\n\n  private nodeRender(el: HTMLElement | null, cell: Cell, index: number): HTMLElement {\n    return this.z.run(() => {\n      let node: EmbeddedViewRef<VirtualContext>;\n      if (!el) {\n        node = this.itmTmp.viewContainer.createEmbeddedView(\n          this.getComponent(cell.type),\n          { $implicit: cell.value, index },\n          index\n        );\n        el = getElement(node);\n        this.refMap.set(el, node);\n      } else {\n        node = this.refMap.get(el)!;\n        const ctx = node.context;\n        ctx.$implicit = cell.value;\n        ctx.index = cell.index;\n      }\n      // run sync change detections\n      node.detectChanges();\n      return el;\n    });\n  }\n\n  private getComponent(type: CellType) {\n    switch (type) {\n      case 'item': return this.itmTmp.templateRef;\n      case 'header': return this.hdrTmp.templateRef;\n      case 'footer': return this.ftrTmp.templateRef;\n    }\n    throw new Error('template for virtual item was not provided');\n  }\n}\n\nconst getElement = (view: EmbeddedViewRef<VirtualContext>): HTMLElement => {\n  const rootNodes = view.rootNodes;\n  for (let i = 0; i < rootNodes.length; i++) {\n    if (rootNodes[i].nodeType === 1) {\n      return rootNodes[i];\n    }\n  }\n  throw new Error('virtual element was not created');\n};\n"]}