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Оптимизация (прекеширование) при скроллинге

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This commit is contained in:
Book Pauk
2019-02-01 21:10:32 +07:00
parent ac111d5ea6
commit e797cedf99
1 changed files with 24 additions and 4 deletions
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28
client/components/Reader/TextPage/TextPage.vue
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@@ -434,6 +434,7 @@ class TextPage extends Vue {
await this.$nextTick();
await sleep(50);
this.cachedPos = -1;
const page = this.$refs.scrollingPage;
let i = 0;
while (!this.stopScrolling) {
@@ -470,10 +471,29 @@ class TextPage extends Vue {
draw() {
if (this.doingScrolling) {
const lines = this.getLines(this.bookPos);
this.linesDown = lines.linesDown;
this.linesUp = lines.linesUp;
this.page1 = this.drawPage(lines.linesDown);
if (this.cachedPos == this.bookPos) {
this.linesDown = this.linesCached.linesDown;
this.linesUp = this.linesCached.linesUp;
this.page1 = this.pageCached;
} else {
const lines = this.getLines(this.bookPos);
this.linesDown = lines.linesDown;
this.linesUp = lines.linesUp;
this.page1 = this.drawPage(lines.linesDown);
}
//caching next
if (this.cachedPageTimer)
clearTimeout(this.cachedPageTimer);
this.cachedPageTimer = setTimeout(() => {
if (this.linesDown && this.linesDown.length > this.pageLineCount && this.pageLineCount > 0) {
this.cachedPos = this.linesDown[1].begin;
this.linesCached = this.getLines(this.cachedPos);
this.pageCached = this.drawPage(this.linesCached.linesDown);
}
this.cachedPageTimer = null;
}, 20);
this.debouncedDrawStatusBar();
return;
}