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Re-factor the PresentationMode handling in BaseViewer.#ensurePageViewVisible

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Given that we're (ab)using spread-modes in order to ensure that pages are centered *vertically* in PresentationMode, this re-factoring simplifies the code slightly.
Furthermore, in the event that we *possibly* want to try and support spread-modes in PresentationMode[1] this re-factoring will also prevent future duplication.

---
[1] Note that I'm not particularly keen on doing that, since documents with varying page sizes will be annoying to handle.
This commit is contained in:
Jonas Jenwald 2022-05-03 13:14:17 +02:00
parent da4f7dfcd0
commit aad4c6538f
1 changed files with 13 additions and 16 deletions
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29
web/base_viewer.js
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@ -885,23 +885,10 @@ class BaseViewer {
// ... and clear out the active ones.
state.pages.length = 0;
if (this._spreadMode === SpreadMode.NONE) {
if (this._spreadMode === SpreadMode.NONE && !this.isInPresentationMode) {
// Finally, append the new page to the viewer.
const pageView = this._pages[pageNumber - 1];
if (this.isInPresentationMode) {
const spread = document.createElement("div");
spread.className = "spread";
const dummyPage = document.createElement("div");
dummyPage.className = "dummyPage";
dummyPage.style.height = `${this.container.clientHeight}px`;
spread.appendChild(dummyPage);
spread.appendChild(pageView.div);
viewer.appendChild(spread);
} else {
viewer.appendChild(pageView.div);
}
viewer.appendChild(pageView.div);
state.pages.push(pageView);
} else {
@ -909,7 +896,10 @@ class BaseViewer {
parity = this._spreadMode - 1;
// Determine the pageIndices in the new spread.
if (pageNumber % 2 !== parity) {
if (parity === -1) {
// PresentationMode is active, with `SpreadMode.NONE` set.
pageIndexSet.add(pageNumber - 1);
} else if (pageNumber % 2 !== parity) {
// Left-hand side page.
pageIndexSet.add(pageNumber - 1);
pageIndexSet.add(pageNumber);
@ -923,6 +913,13 @@ class BaseViewer {
const spread = document.createElement("div");
spread.className = "spread";
if (this.isInPresentationMode) {
const dummyPage = document.createElement("div");
dummyPage.className = "dummyPage";
dummyPage.style.height = `${this.container.clientHeight}px`;
spread.appendChild(dummyPage);
}
for (const i of pageIndexSet) {
const pageView = this._pages[i];
if (!pageView) {