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Unconditionally initialize the this._pageOpenPendingSet in BaseViewer._initializeScriptingEvents (PR 12747 follow-up)

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With the code dispatching a "pageopen" event on the existing (general) `BaseViewer` event "pagesinit", in practice this means that the `Set` is always being created. Hence we can simplify the method overall, by always initializing the `this._pageOpenPendingSet` property.
This commit is contained in:
Jonas Jenwald 2021-01-06 16:09:34 +01:00
parent 32b0e00ba7
commit 373230185a
1 changed files with 7 additions and 9 deletions
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16
web/base_viewer.js
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@ -654,7 +654,7 @@ class BaseViewer {
this._pagesCapability = createPromiseCapability();
this._scrollMode = ScrollMode.VERTICAL;
this._spreadMode = SpreadMode.NONE;
this._pageOpenPendingSet = null;
this._pageOpenPendingSet?.clear();
if (this._onBeforeDraw) {
this.eventBus._off("pagerender", this._onBeforeDraw);
@ -1514,10 +1514,11 @@ class BaseViewer {
if (!this.enableScripting) {
return;
}
const { eventBus } = this;
const eventBus = this.eventBus,
pageOpenPendingSet = (this._pageOpenPendingSet ||= new Set());
const dispatchPageClose = pageNumber => {
if (this._pageOpenPendingSet?.has(pageNumber)) {
if (pageOpenPendingSet.has(pageNumber)) {
return; // No "pageopen" event was dispatched for the previous page.
}
eventBus.dispatch("pageclose", { source: this, pageNumber });
@ -1525,14 +1526,11 @@ class BaseViewer {
const dispatchPageOpen = (pageNumber, force = false) => {
const pageView = this._pages[pageNumber - 1];
if (force || pageView?.renderingState === RenderingStates.FINISHED) {
this._pageOpenPendingSet?.delete(pageNumber);
pageOpenPendingSet.delete(pageNumber);
eventBus.dispatch("pageopen", { source: this, pageNumber });
} else {
if (!this._pageOpenPendingSet) {
this._pageOpenPendingSet = new Set();
}
this._pageOpenPendingSet.add(pageNumber);
pageOpenPendingSet.add(pageNumber);
}
};
@ -1545,7 +1543,7 @@ class BaseViewer {
});
eventBus._on("pagerendered", ({ pageNumber }) => {
if (!this._pageOpenPendingSet?.has(pageNumber)) {
if (!pageOpenPendingSet.has(pageNumber)) {
return; // No pending "pageopen" event for the newly rendered page.
}
if (pageNumber !== this._currentPageNumber) {