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Slightly optimize spreadMode toggling with ScrollMode.PAGE set (PR 14112 follow-up)

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It shouldn't be necessary to iterate through *all* pages when using a non-default `spreadMode`, since we already know which page(s) should become visible.
This code is a left-over from the initial (local) implementation that resulted in PR 14112, however I forgot to clean-up some things such as e.g. this loop.

Also fixes an outdated comment, see PR 14204 which removed the mentioned data-structure.
This commit is contained in:
Jonas Jenwald 2021-11-16 15:16:59 +01:00
parent e4f97a2a91
commit 1214c056e9
1 changed files with 10 additions and 11 deletions
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21
web/base_viewer.js
View File

@ -616,9 +616,8 @@ class BaseViewer {
}
if (this._scrollMode === ScrollMode.PAGE) {
// Since the pages are placed in a `DocumentFragment`, ensure that
// the current page becomes visible upon loading of the document.
this._ensurePageViewVisible();
// Ensure that the current page becomes visible on document load.
this.#ensurePageViewVisible();
} else if (this._spreadMode !== SpreadMode.NONE) {
this._updateSpreadMode();
}
@ -744,9 +743,9 @@ class BaseViewer {
this._updateScrollMode();
}
_ensurePageViewVisible() {
#ensurePageViewVisible() {
if (this._scrollMode !== ScrollMode.PAGE) {
throw new Error("_ensurePageViewVisible: Invalid scrollMode value.");
throw new Error("#ensurePageViewVisible: Invalid scrollMode value.");
}
const pageNumber = this._currentPageNumber,
state = this.#scrollModePageState,
@ -780,8 +779,9 @@ class BaseViewer {
// Finally, append the new pages to the viewer and apply the spreadMode.
let spread = null;
for (let i = 0, ii = this._pages.length; i < ii; ++i) {
if (!pageIndexSet.has(i)) {
for (const i of pageIndexSet) {
const pageView = this._pages[i];
if (!pageView) {
continue;
}
if (spread === null) {
@ -792,7 +792,6 @@ class BaseViewer {
spread = spread.cloneNode(false);
viewer.appendChild(spread);
}
const pageView = this._pages[i];
spread.appendChild(pageView.div);
state.pages.push(pageView);
@ -816,7 +815,7 @@ class BaseViewer {
// Ensure that `this._currentPageNumber` is correct.
this._setCurrentPageNumber(pageNumber);
}
this._ensurePageViewVisible();
this.#ensurePageViewVisible();
// Ensure that rendering always occurs, to avoid showing a blank page,
// even if the current position doesn't change when the page is scrolled.
this.update();
@ -1669,7 +1668,7 @@ class BaseViewer {
}
if (scrollMode === ScrollMode.PAGE) {
this._ensurePageViewVisible();
this.#ensurePageViewVisible();
} else if (this._previousScrollMode === ScrollMode.PAGE) {
// Ensure that the current spreadMode is still applied correctly when
// the *previous* scrollMode was `ScrollMode.PAGE`.
@ -1718,7 +1717,7 @@ class BaseViewer {
pages = this._pages;
if (this._scrollMode === ScrollMode.PAGE) {
this._ensurePageViewVisible();
this.#ensurePageViewVisible();
} else {
// Temporarily remove all the pages from the DOM.
viewer.textContent = "";