Remove the sourceEventType from the viewer (bug 1757771 follow-up)

After the changes in https://bugzilla.mozilla.org/show_bug.cgi?id=1757771, that simplified the MOZCENTRAL downloading code, the `sourceEventType` is now completely unused and should thus be removed (in my opinion).

Furthermore, with these changes, we also no longer need a *separate* internal "save"-event and can instead just use the older "download"-event everywhere.

web/app.js

@@ -811,7 +811,7 @@ const PDFViewerApplication = {
     ) {
       try {
         // Trigger saving, to prevent data loss in forms; see issue 12257.
-        await this.save({ sourceEventType: "save" });
+        await this.save();
       } catch (reason) {
         // Ignoring errors, to ensure that document closing won't break.
       }
@@ -964,7 +964,7 @@ const PDFViewerApplication = {
     throw new Error("PDF document not downloaded.");
   },
 
-  async download({ sourceEventType = "download" } = {}) {
+  async download() {
     const url = this._downloadUrl,
       filename = this._docFilename;
     try {
@@ -973,15 +973,15 @@ const PDFViewerApplication = {
       const data = await this.pdfDocument.getData();
       const blob = new Blob([data], { type: "application/pdf" });
 
-      await this.downloadManager.download(blob, url, filename, sourceEventType);
+      await this.downloadManager.download(blob, url, filename);
     } catch (reason) {
       // When the PDF document isn't ready, or the PDF file is still
       // downloading, simply download using the URL.
       await this.downloadManager.downloadUrl(url, filename);
     }
   },
 
-  async save({ sourceEventType = "download" } = {}) {
+  async save() {
     if (this._saveInProgress) {
       return;
     }
@@ -996,23 +996,23 @@ const PDFViewerApplication = {
       const data = await this.pdfDocument.saveDocument();
       const blob = new Blob([data], { type: "application/pdf" });
 
-      await this.downloadManager.download(blob, url, filename, sourceEventType);
+      await this.downloadManager.download(blob, url, filename);
     } catch (reason) {
       // When the PDF document isn't ready, or the PDF file is still
       // downloading, simply fallback to a "regular" download.
       console.error(`Error when saving the document: ${reason.message}`);
-      await this.download({ sourceEventType });
+      await this.download();
     } finally {
       await this.pdfScriptingManager.dispatchDidSave();
       this._saveInProgress = false;
     }
   },
 
-  downloadOrSave(options) {
+  downloadOrSave() {
     if (this.pdfDocument?.annotationStorage.size > 0) {
-      this.save(options);
+      this.save();
     } else {
-      this.download(options);
+      this.download();
     }
   },
 
@@ -1875,7 +1875,6 @@ const PDFViewerApplication = {
     eventBus._on("presentationmode", webViewerPresentationMode);
     eventBus._on("print", webViewerPrint);
     eventBus._on("download", webViewerDownload);
-    eventBus._on("save", webViewerSave);
     eventBus._on("firstpage", webViewerFirstPage);
     eventBus._on("lastpage", webViewerLastPage);
     eventBus._on("nextpage", webViewerNextPage);
@@ -1973,7 +1972,6 @@ const PDFViewerApplication = {
     eventBus._off("presentationmode", webViewerPresentationMode);
     eventBus._off("print", webViewerPrint);
     eventBus._off("download", webViewerDownload);
-    eventBus._off("save", webViewerSave);
     eventBus._off("firstpage", webViewerFirstPage);
     eventBus._off("lastpage", webViewerLastPage);
     eventBus._off("nextpage", webViewerNextPage);
@@ -2330,7 +2328,7 @@ function webViewerNamedAction(evt) {
       break;
 
     case "SaveAs":
-      webViewerSave();
+      PDFViewerApplication.downloadOrSave();
       break;
   }
 }
@@ -2461,10 +2459,7 @@ function webViewerPrint() {
   PDFViewerApplication.triggerPrinting();
 }
 function webViewerDownload() {
-  PDFViewerApplication.downloadOrSave({ sourceEventType: "download" });
-}
-function webViewerSave() {
-  PDFViewerApplication.downloadOrSave({ sourceEventType: "save" });
+  PDFViewerApplication.downloadOrSave();
 }
 function webViewerFirstPage() {
   if (PDFViewerApplication.pdfDocument) {

web/download_manager.js

@@ -109,13 +109,7 @@ class DownloadManager {
     return false;
   }
 
-  /**
-   * @param sourceEventType {string} Used to signal what triggered the download.
-   *   The version of PDF.js integrated with Firefox uses this to to determine
-   *   which dialog to show. "save" triggers "save as" and "download" triggers
-   *   the "open with" dialog.
-   */
-  download(blob, url, filename, sourceEventType = "download") {
+  download(blob, url, filename) {
     const blobUrl = URL.createObjectURL(blob);
     download(blobUrl, filename);
   }

web/firefoxcom.js

@@ -158,14 +158,13 @@ class DownloadManager {
     return false;
   }
 
-  download(blob, url, filename, sourceEventType = "download") {
+  download(blob, url, filename) {
     const blobUrl = URL.createObjectURL(blob);
 
     FirefoxCom.requestAsync("download", {
       blobUrl,
       originalUrl: url,
       filename,
-      sourceEventType,
     }).then(error => {
       if (error) {
         // If downloading failed in `PdfStreamConverter.jsm` it's very unlikely
@@ -275,7 +274,7 @@ class MozL10n {
     if (!PDFViewerApplication.initialized) {
       return;
     }
-    PDFViewerApplication.eventBus.dispatch(type, { source: window });
+    PDFViewerApplication.eventBus.dispatch("download", { source: window });
   };
 
   window.addEventListener("save", handleEvent);

web/interfaces.js

@@ -267,9 +267,8 @@ class IDownloadManager {
    * @param {Blob} blob
    * @param {string} url
    * @param {string} filename
-   * @param {string} [sourceEventType]
    */
-  download(blob, url, filename, sourceEventType = "download") {}
+  download(blob, url, filename) {}
 }
 
 /**

web/pdf_scripting_manager.js

@@ -311,7 +311,7 @@ class PDFScriptingManager {
           this._pdfViewer.currentScaleValue = value;
           break;
         case "SaveAs":
-          this._eventBus.dispatch("save", { source: this });
+          this._eventBus.dispatch("download", { source: this });
           break;
         case "FirstPage":
           this._pdfViewer.currentPageNumber = 1;