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Inline single-line event handlers in the web/app.js file
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We have a fair number of (effectively) single-line event handlers in the  `web/app.js` file, which leads to unnecessarily verbose code. These can, without affecting readability too much, be replaced either by:
 - Using `bind` for the simplest cases.
 - Using arrow-functions for the remaining ones.

Note that this is possible since we started removing event listeners with `AbortSignal`, which means that we no longer need to keep a reference to the event handler functions to be able to remove them.

Given that the old event handler functions use fairly long function names, and the way that they access `PDFViewerApplication` (given their scope), they impact the overall code-size unnecessarily.
*Note:* This patch reduces the size of the `gulp mozcentral` output by `~3.5` kilo-bytes, which isn't a lot but still cannot hurt.
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@Snuffleupagus
Snuffleupagus committed Jul 31, 2024
1 parent 8f45374 commit 83b143a
Showing 1 changed file with 58 additions and 104 deletions.
162 changes: 58 additions & 104 deletions web/app.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1849,11 +1849,14 @@ const PDFViewerApplication = {
this.pdfPresentationMode?.request();
},

openDocumentProperties() {
this.pdfDocumentProperties?.open();
},

triggerPrinting() {
if (!this.supportsPrinting) {
return;
if (this.supportsPrinting) {
window.print();
}
window.print();
},

bindEvents() {
Expand All @@ -1864,6 +1867,9 @@ const PDFViewerApplication = {

const {
eventBus,
externalServices,
pdfViewer,
preferences,
_eventBusAbortController: { signal },
} = this;

Expand All @@ -1880,41 +1886,57 @@ const PDFViewerApplication = {
eventBus._on("sidebarviewchanged", webViewerSidebarViewChanged, { signal });
eventBus._on("pagemode", webViewerPageMode, { signal });
eventBus._on("namedaction", webViewerNamedAction, { signal });
eventBus._on("presentationmodechanged", webViewerPresentationModeChanged, {
eventBus._on(
"presentationmodechanged",
evt => (pdfViewer.presentationModeState = evt.state),
{ signal }
);
eventBus._on("presentationmode", this.requestPresentationMode.bind(this), {
signal,
});
eventBus._on("presentationmode", webViewerPresentationMode, { signal });
eventBus._on(
"switchannotationeditormode",
webViewerSwitchAnnotationEditorMode,
evt => (pdfViewer.annotationEditorMode = evt),
{ signal }
);
eventBus._on(
"switchannotationeditorparams",
webViewerSwitchAnnotationEditorParams,
evt => (pdfViewer.annotationEditorParams = evt),
{ signal }
);
eventBus._on("print", webViewerPrint, { signal });
eventBus._on("download", webViewerDownload, { signal });
eventBus._on("firstpage", webViewerFirstPage, { signal });
eventBus._on("lastpage", webViewerLastPage, { signal });
eventBus._on("nextpage", webViewerNextPage, { signal });
eventBus._on("previouspage", webViewerPreviousPage, { signal });
eventBus._on("zoomin", webViewerZoomIn, { signal });
eventBus._on("zoomout", webViewerZoomOut, { signal });
eventBus._on("zoomreset", webViewerZoomReset, { signal });
eventBus._on("print", this.triggerPrinting.bind(this), { signal });
eventBus._on("download", this.downloadOrSave.bind(this), { signal });
eventBus._on("firstpage", () => (this.page = 1), { signal });
eventBus._on("lastpage", () => (this.page = this.pagesCount), { signal });
eventBus._on("nextpage", () => pdfViewer.nextPage(), { signal });
eventBus._on("previouspage", () => pdfViewer.previousPage(), { signal });
eventBus._on("zoomin", this.zoomIn.bind(this), { signal });
eventBus._on("zoomout", this.zoomOut.bind(this), { signal });
eventBus._on("zoomreset", this.zoomReset.bind(this), { signal });
eventBus._on("pagenumberchanged", webViewerPageNumberChanged, { signal });
eventBus._on("scalechanged", webViewerScaleChanged, { signal });
eventBus._on("rotatecw", webViewerRotateCw, { signal });
eventBus._on("rotateccw", webViewerRotateCcw, { signal });
eventBus._on("optionalcontentconfig", webViewerOptionalContentConfig, {
eventBus._on(
"scalechanged",
evt => (pdfViewer.currentScaleValue = evt.value),
{ signal }
);
eventBus._on("rotatecw", this.rotatePages.bind(this, 90), { signal });
eventBus._on("rotateccw", this.rotatePages.bind(this, -90), { signal });
eventBus._on(
"optionalcontentconfig",
evt => (pdfViewer.optionalContentConfigPromise = evt.promise),
{ signal }
);
eventBus._on("switchscrollmode", evt => (pdfViewer.scrollMode = evt.mode), {
signal,
});
eventBus._on("switchscrollmode", webViewerSwitchScrollMode, { signal });
eventBus._on("scrollmodechanged", webViewerScrollModeChanged, { signal });
eventBus._on("switchspreadmode", webViewerSwitchSpreadMode, { signal });
eventBus._on("switchspreadmode", evt => (pdfViewer.spreadMode = evt.mode), {
signal,
});
eventBus._on("spreadmodechanged", webViewerSpreadModeChanged, { signal });
eventBus._on("documentproperties", webViewerDocumentProperties, { signal });
eventBus._on("documentproperties", this.openDocumentProperties.bind(this), {
signal,
});
eventBus._on("findfromurlhash", webViewerFindFromUrlHash, { signal });
eventBus._on("updatefindmatchescount", webViewerUpdateFindMatchesCount, {
signal,
Expand All @@ -1930,11 +1952,19 @@ const PDFViewerApplication = {
if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
eventBus._on(
"annotationeditorstateschanged",
webViewerAnnotationEditorStatesChanged,
evt => externalServices.updateEditorStates(evt),
{ signal }
);
eventBus._on(
"reporttelemetry",
evt => externalServices.reportTelemetry(evt.details),
{ signal }
);
eventBus._on(
"setpreference",
evt => preferences.set(evt.name, evt.value),
{ signal }
);
eventBus._on("reporttelemetry", webViewerReportTelemetry, { signal });
eventBus._on("setpreference", webViewerSetPreference, { signal });
}
},

Expand All @@ -1947,12 +1977,13 @@ const PDFViewerApplication = {
const {
eventBus,
appConfig: { mainContainer },
pdfViewer,
_windowAbortController: { signal },
} = this;

function addWindowResolutionChange(evt = null) {
if (evt) {
webViewerResolutionChange(evt);
pdfViewer.refresh();
}
const mediaQueryList = window.matchMedia(
`(resolution: ${window.devicePixelRatio || 1}dppx)`
Expand Down Expand Up @@ -2273,10 +2304,6 @@ function webViewerNamedAction(evt) {
}
}

function webViewerPresentationModeChanged(evt) {
PDFViewerApplication.pdfViewer.presentationModeState = evt.state;
}

function webViewerSidebarViewChanged({ view }) {
PDFViewerApplication.pdfRenderingQueue.isThumbnailViewEnabled =
view === SidebarView.THUMBS;
Expand Down Expand Up @@ -2392,42 +2419,6 @@ if (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) {
};
}

function webViewerPresentationMode() {
PDFViewerApplication.requestPresentationMode();
}
function webViewerSwitchAnnotationEditorMode(evt) {
PDFViewerApplication.pdfViewer.annotationEditorMode = evt;
}
function webViewerSwitchAnnotationEditorParams(evt) {
PDFViewerApplication.pdfViewer.annotationEditorParams = evt;
}
function webViewerPrint() {
PDFViewerApplication.triggerPrinting();
}
function webViewerDownload() {
PDFViewerApplication.downloadOrSave();
}
function webViewerFirstPage() {
PDFViewerApplication.page = 1;
}
function webViewerLastPage() {
PDFViewerApplication.page = PDFViewerApplication.pagesCount;
}
function webViewerNextPage() {
PDFViewerApplication.pdfViewer.nextPage();
}
function webViewerPreviousPage() {
PDFViewerApplication.pdfViewer.previousPage();
}
function webViewerZoomIn() {
PDFViewerApplication.zoomIn();
}
function webViewerZoomOut() {
PDFViewerApplication.zoomOut();
}
function webViewerZoomReset() {
PDFViewerApplication.zoomReset();
}
function webViewerPageNumberChanged(evt) {
const pdfViewer = PDFViewerApplication.pdfViewer;
// Note that for `<input type="number">` HTML elements, an empty string will
Expand All @@ -2448,27 +2439,6 @@ function webViewerPageNumberChanged(evt) {
);
}
}
function webViewerScaleChanged(evt) {
PDFViewerApplication.pdfViewer.currentScaleValue = evt.value;
}
function webViewerRotateCw() {
PDFViewerApplication.rotatePages(90);
}
function webViewerRotateCcw() {
PDFViewerApplication.rotatePages(-90);
}
function webViewerOptionalContentConfig(evt) {
PDFViewerApplication.pdfViewer.optionalContentConfigPromise = evt.promise;
}
function webViewerSwitchScrollMode(evt) {
PDFViewerApplication.pdfViewer.scrollMode = evt.mode;
}
function webViewerSwitchSpreadMode(evt) {
PDFViewerApplication.pdfViewer.spreadMode = evt.mode;
}
function webViewerDocumentProperties() {
PDFViewerApplication.pdfDocumentProperties?.open();
}

function webViewerFindFromUrlHash(evt) {
PDFViewerApplication.eventBus.dispatch("find", {
Expand Down Expand Up @@ -2546,10 +2516,6 @@ function webViewerPageChanging({ pageNumber, pageLabel }) {
);
}

function webViewerResolutionChange(evt) {
PDFViewerApplication.pdfViewer.refresh();
}

function webViewerWheel(evt) {
const {
pdfViewer,
Expand Down Expand Up @@ -3151,16 +3117,4 @@ function beforeUnload(evt) {
return false;
}

function webViewerAnnotationEditorStatesChanged(data) {
PDFViewerApplication.externalServices.updateEditorStates(data);
}

function webViewerReportTelemetry({ details }) {
PDFViewerApplication.externalServices.reportTelemetry(details);
}

function webViewerSetPreference({ name, value }) {
PDFViewerApplication.preferences.set(name, value);
}

export { PDFViewerApplication };

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