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perf(virtual-scroll): reduce DOM writes

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This commit is contained in:
Manu Mtz.-Almeida
2018-02-09 17:22:37 +01:00
parent a47d087135
commit 9226684826
7 changed files with 332 additions and 138 deletions
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packages/angular/package-lock.json generated
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@ -207,18 +207,18 @@
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"optional": true, "optional": true,
"requires": { "requires": {
"extsprintf": "1.0.2" "extsprintf": "1.0.2"
@ -2176,7 +2288,8 @@
}, },
"wide-align": { "wide-align": {
"version": "1.1.2", "version": "1.1.2",
"bundled": true, "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.2.tgz",
"integrity": "sha512-ijDLlyQ7s6x1JgCLur53osjm/UXUYD9+0PbYKrBsYisYXzCxN+HC3mYDNy/dWdmf3AwqwU3CXwDCvsNgGK1S0w==",
"optional": true, "optional": true,
"requires": { "requires": {
"string-width": "1.0.2" "string-width": "1.0.2"
@ -2184,7 +2297,8 @@
}, },
"wrappy": { "wrappy": {
"version": "1.0.2", "version": "1.0.2",
"bundled": true "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
"integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
} }
} }
}, },

11
packages/angular/src/directives/virtual-scroll.ts
View File

@ -1,4 +1,4 @@
import { EmbeddedViewRef, AfterContentInit, ContentChild, Directive, ElementRef, Input, IterableDiffers, TrackByFunction } from '@angular/core'; import { EmbeddedViewRef, AfterContentInit, ContentChild, Directive, ElementRef, Input, IterableDiffers, TrackByFunction, ChangeDetectorRef } from '@angular/core';
import { VirtualItem } from './virtual-item'; import { VirtualItem } from './virtual-item';
import { VirtualHeader } from './virtual-header'; import { VirtualHeader } from './virtual-header';
import { VirtualFooter } from './virtual-footer'; import { VirtualFooter } from './virtual-footer';
@ -13,7 +13,10 @@ export class VirtualScroll {
@ContentChild(VirtualHeader) hdrTmp: VirtualHeader; @ContentChild(VirtualHeader) hdrTmp: VirtualHeader;
@ContentChild(VirtualFooter) ftrTmp: VirtualFooter; @ContentChild(VirtualFooter) ftrTmp: VirtualFooter;
constructor(private el: ElementRef) { constructor(
private el: ElementRef,
private cd: ChangeDetectorRef,
) {
this.el.nativeElement.itemRender = this.itemRender.bind(this); this.el.nativeElement.itemRender = this.itemRender.bind(this);
} }
@ -27,9 +30,11 @@ export class VirtualScroll {
el = getElement(node); el = getElement(node);
(el as any)['$ionView'] = node; (el as any)['$ionView'] = node;
} }
const ctx = (el as any)['$ionView'].context; const node = (el as any)['$ionView'];
const ctx = node.context;
ctx.$implicit = cell.value; ctx.$implicit = cell.value;
ctx.index = cell.index; ctx.index = cell.index;
node.detectChanges();
return el; return el;
} }

7
packages/core/src/components/virtual-scroll/virtual-scroll-utils.tsx
View File

@ -102,7 +102,11 @@ export function updateVDom(dom: VirtualNode[], heightIndex: Uint32Array, cells:
} }
export function doRender(el: HTMLElement, itemRender: ItemRenderFn, dom: VirtualNode[], updateCellHeight: Function, total: number) { export function doRender(
el: HTMLElement,
itemRender: ItemRenderFn,
dom: VirtualNode[],
updateCellHeight: Function) {
const children = el.children; const children = el.children;
let child: HTMLElement; let child: HTMLElement;
for (let i = 0; i < dom.length; i++) { for (let i = 0; i < dom.length; i++) {
@ -137,7 +141,6 @@ export function doRender(el: HTMLElement, itemRender: ItemRenderFn, dom: Virtual
updateCellHeight(cell, child); updateCellHeight(cell, child);
} }
} }
el.style.height = total + 'px';
} }
export function getViewport(scrollTop: number, vierportHeight: number, margin: number): Viewport { export function getViewport(scrollTop: number, vierportHeight: number, margin: number): Viewport {

2
packages/core/src/components/virtual-scroll/virtual-scroll.scss
View File

@ -6,7 +6,7 @@ ion-virtual-scroll {
width: 100%; width: 100%;
contain: content; contain: strict;
} }
.virtual-loading { .virtual-loading {

13
packages/core/src/components/virtual-scroll/virtual-scroll.tsx
View File

@ -23,6 +23,7 @@ export class VirtualScroll {
private currentScrollTop = 0; private currentScrollTop = 0;
private indexDirty = 0; private indexDirty = 0;
private totalHeight = 0; private totalHeight = 0;
private heightChanged = false;
@Element() el: HTMLElement; @Element() el: HTMLElement;
@ -196,7 +197,11 @@ export class VirtualScroll {
// write DOM // write DOM
if (this.itemRender) { if (this.itemRender) {
doRender(this.el, this.itemRender, this.virtualDom, this.updateCellHeight.bind(this), this.totalHeight); doRender(this.el, this.itemRender, this.virtualDom, this.updateCellHeight.bind(this));
if (this.heightChanged) {
this.el.style.height = this.totalHeight + 'px';
this.heightChanged = false;
}
} else if (this.domRender) { } else if (this.domRender) {
this.domRender(this.virtualDom, this.totalHeight); this.domRender(this.virtualDom, this.totalHeight);
} }
@ -273,7 +278,11 @@ export class VirtualScroll {
private calcHeightIndex(index = 0) { private calcHeightIndex(index = 0) {
this.heightIndex = resizeBuffer(this.heightIndex, this.cells.length); this.heightIndex = resizeBuffer(this.heightIndex, this.cells.length);
this.totalHeight = calcHeightIndex(this.heightIndex, this.cells, index); const totalHeight = calcHeightIndex(this.heightIndex, this.cells, index);
if (totalHeight !== this.totalHeight) {
this.totalHeight = totalHeight;
this.heightChanged = true;
}
this.indexDirty = Infinity; this.indexDirty = Infinity;
} }

6
packages/demos/angular/package-lock.json generated
View File

@ -505,9 +505,9 @@
} }
}, },
"@ionic/core": { "@ionic/core": {
"version": "0.0.2-55", "version": "0.0.2-59",
"resolved": "https://registry.npmjs.org/@ionic/core/-/core-0.0.2-55.tgz", "resolved": "https://registry.npmjs.org/@ionic/core/-/core-0.0.2-59.tgz",
"integrity": "sha512-nrBa0Kf5Hd/L6sG7YeKt8H0jM+gdvItNaXEyrZ+Y8AlPkRrFzQ03mltLsimbOaWbrvPSJwOMlWbMa+Vb5hSZhQ==" "integrity": "sha512-leAbEFIEYlfwMN1BIAbEIDtpQHlnJ/BXX4HfqAIjVkbEnUx2NO888+sCxXw+Ux8GeUwqdAEBXRPosCXMvuApJw=="
}, },
"@ngtools/json-schema": { "@ngtools/json-schema": {
"version": "1.1.0", "version": "1.1.0",

73
packages/demos/angular/src/app/virtual-scroll/virtual-scroll-page.component.ts
View File

@ -12,18 +12,81 @@ import { ToastController } from '@ionic/angular';
<ion-title>Test</ion-title> <ion-title>Test</ion-title>
</ion-toolbar> </ion-toolbar>
</ion-header> </ion-header>
<ion-content padding>
<ion-virtual-scroll [items]="items"> <ion-content>
<ion-item *virtualItem="let item">{{item}}</ion-item>
<ion-virtual-scroll [items]="items" approxItemHeight="320px">
<ion-card *virtualItem="let item; let itemBounds = bounds;">
<div>
<img [src]="item.imgSrc" [height]="item.imgHeight" [alt]="item.name">
</div>
<ion-card-header>
<ion-card-title>{{ item.name }}</ion-card-title>
</ion-card-header>
<ion-card-content>{{ item.content }}</ion-card-content>
</ion-card>
</ion-virtual-scroll> </ion-virtual-scroll>
</ion-content> </ion-content>
</ion-page> </ion-page>
</ion-app>` </ion-app>`
}) })
export class VirtualScrollPageComponent { export class VirtualScrollPageComponent {
items: string[]; items: any[] = [];
constructor() { constructor() {
this.items = Array.from({length: 1000}, (_, i) => i + ''); for (let i = 0; i < 1000; i++) {
this.items.push({
name: i + ' - ' + images[rotateImg],
imgSrc: getImgSrc(),
avatarSrc: getImgSrc(),
imgHeight: Math.floor((Math.random() * 50) + 150),
content: lorem.substring(0, (Math.random() * (lorem.length - 100)) + 100)
});
rotateImg++;
if (rotateImg === images.length) {
rotateImg = 0;
}
}
} }
} }
const lorem = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed' +
'do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim' +
' veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo ' +
'consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse ' +
'cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non' +
' proident, sunt in culpa qui officia deserunt mollit anim id est laborum.';
const images = [
'bandit',
'batmobile',
'blues-brothers',
'bueller',
'delorean',
'eleanor',
'general-lee',
'ghostbusters',
'knight-rider',
'mirth-mobile',
];
function getImgSrc() {
const src = `https://dummyimage.com/600x400/${Math.round(Math.random() * 99999)}/fff.png`;
rotateImg++;
if (rotateImg === images.length) {
rotateImg = 0;
}
return src;
}
let rotateImg = 0;