Add a manage button in the thumbnail view in order to save an edited pdf (bug 2010830)

src/display/display_utils.js

@@ -1182,10 +1182,39 @@ class PagesMapper {
     // Finally insert the moved pages.
     pageNumberToId.set(mappedPagesToMove, adjustedTarget);
 
+    let hasChanged = false;
     for (let i = 0, ii = pagesNumber; i < ii; i++) {
-      idToPageNumber[pageNumberToId[i] - 1] = i + 1;
+      const id = pageNumberToId[i];
+      hasChanged ||= id !== i + 1;
+      idToPageNumber[id - 1] = i + 1;
     }
     this.#updateListeners();
+
+    if (!hasChanged) {
+      // Reset.
+      this.pagesNumber = 0;
+    }
+  }
+
+  /**
+   * Checks if the page mappings have been altered from their initial state.
+   * @returns {boolean} True if the mappings have been altered, false otherwise.
+   */
+  hasBeenAltered() {
+    return PagesMapper.#pageNumberToId !== null;
+  }
+
+  /**
+   * Gets the current page mapping suitable for saving.
+   * @returns {Object} An object containing the page indices.
+   */
+  getPageMappingForSaving() {
+    // Saving is index-based.
+    return {
+      pageIndices: PagesMapper.#idToPageNumber
+        ? PagesMapper.#idToPageNumber.map(x => x - 1)
+        : null,
+    };
   }
 
   getPrevPageNumber(pageNumber) {

test/integration/reorganize_pages_spec.mjs

@@ -568,4 +568,66 @@ describe("Reorganize Pages View", () => {
       );
     });
   });
+
+  describe("Save a pdf", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait(
+        "page_with_number.pdf",
+        "#viewsManagerToggleButton",
+        "1",
+        null,
+        { enableSplitMerge: true }
+      );
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("should check that a save is triggered", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await waitForThumbnailVisible(page, 1);
+          await page.waitForSelector("#viewsManagerStatusActionButton", {
+            visible: true,
+          });
+          const rect1 = await getRect(page, getThumbnailSelector(1));
+          const rect2 = await getRect(page, getThumbnailSelector(2));
+
+          await dragAndDrop(
+            page,
+            getThumbnailSelector(1),
+            [[0, rect2.y - rect1.y + rect2.height / 2]],
+            10
+          );
+
+          const handleSaveAs = await createPromise(page, resolve => {
+            window.PDFViewerApplication.eventBus.on(
+              "savepageseditedpdf",
+              ({ data }) => {
+                resolve(Array.from(data.pageIndices));
+              },
+              {
+                once: true,
+              }
+            );
+          });
+
+          await page.click("#viewsManagerStatusActionButton");
+          await page.waitForSelector("#viewsManagerStatusActionSaveAs", {
+            visible: true,
+          });
+          await page.click("#viewsManagerStatusActionSaveAs");
+          const pageIndices = await awaitPromise(handleSaveAs);
+          expect(pageIndices)
+            .withContext(`In ${browserName}`)
+            .toEqual([
+              1, 0, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
+            ]);
+        })
+      );
+    });
+  });
 });

test/integration/thumbnail_view_spec.mjs

@@ -124,6 +124,13 @@ describe("PDF Thumbnail View", () => {
             .withContext(`In ${browserName}`)
             .toBe(true);
 
+          await kbFocusNext(page);
+          expect(
+            await isElementFocused(page, "#viewsManagerStatusActionButton")
+          )
+            .withContext(`In ${browserName}`)
+            .toBe(true);
+
           await kbFocusNext(page);
           expect(
             await isElementFocused(

web/app.js

@@ -605,6 +605,7 @@ const PDFViewerApplication = {
         abortSignal,
         enableHWA,
         enableSplitMerge: AppOptions.get("enableSplitMerge"),
+        manageMenu: appConfig.viewsManager.manageMenu,
       });
       renderingQueue.setThumbnailViewer(this.pdfThumbnailViewer);
     }
@@ -2194,6 +2195,11 @@ const PDFViewerApplication = {
       this.onBeforePagesEdited.bind(this),
       opts
     );
+    eventBus._on(
+      "savepageseditedpdf",
+      this.onSavePagesEditedPDF.bind(this),
+      opts
+    );
   },
 
   bindWindowEvents() {
@@ -2376,6 +2382,35 @@ const PDFViewerApplication = {
     this.pdfViewer.onPagesEdited(data);
   },
 
+  async onSavePagesEditedPDF({
+    data: { includePages, excludePages, pageIndices },
+  }) {
+    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
+      return;
+    }
+    if (!this.pdfDocument) {
+      return;
+    }
+    const pageInfo = {
+      document: null, // For now, no merge.
+      includePages,
+      excludePages,
+      pageIndices,
+    };
+    const modifiedPdfBytes = await this.pdfDocument.extractPages([pageInfo]);
+    if (!modifiedPdfBytes) {
+      console.error(
+        "Something wrong happened when saving the edited PDF.\nPlease file a bug."
+      );
+      return;
+    }
+    this.downloadManager.download(
+      modifiedPdfBytes,
+      this._downloadUrl,
+      this._docFilename
+    );
+  },
+
   _accumulateTicks(ticks, prop) {
     // If the direction changed, reset the accumulated ticks.
     if ((this[prop] > 0 && ticks < 0) || (this[prop] < 0 && ticks > 0)) {

web/pdf_thumbnail_viewer.js

@@ -28,6 +28,7 @@ import {
   watchScroll,
 } from "./ui_utils.js";
 import { MathClamp, noContextMenu, PagesMapper, stopEvent } from "pdfjs-lib";
+import { Menu } from "./menu.js";
 import { PDFThumbnailView } from "./pdf_thumbnail_view.js";
 
 const SCROLL_OPTIONS = {
@@ -67,6 +68,8 @@ const SPACE_FOR_DRAG_MARKER_WHEN_NO_NEXT_ELEMENT = 15;
  *   rendering. The default value is `false`.
  * @property {boolean} [enableSplitMerge] - Enables split and merge features.
  *   The default value is `false`.
+ * @property {Object} [manageMenu] - The menu elements to manage saving edited
+ *   PDF.
  */
 
 /**
@@ -109,6 +112,8 @@ class PDFThumbnailViewer {
 
   #pagesMapper = PagesMapper.instance;
 
+  #manageSaveAsButton = null;
+
   /**
    * @param {PDFThumbnailViewerOptions} options
    */
@@ -123,6 +128,7 @@ class PDFThumbnailViewer {
     abortSignal,
     enableHWA,
     enableSplitMerge,
+    manageMenu,
   }) {
     this.scrollableContainer = container.parentElement;
     this.container = container;
@@ -135,6 +141,20 @@ class PDFThumbnailViewer {
     this.enableHWA = enableHWA || false;
     this.#enableSplitMerge = enableSplitMerge || false;
 
+    if (this.#enableSplitMerge && manageMenu) {
+      const { button, menu, copy, cut, delete: del, saveAs } = manageMenu;
+      this._manageMenu = new Menu(menu, button, [copy, cut, del, saveAs]);
+      this.#manageSaveAsButton = saveAs;
+      saveAs.addEventListener("click", () => {
+        this.eventBus.dispatch("savepageseditedpdf", {
+          source: this,
+          data: this.#pagesMapper.getPageMappingForSaving(),
+        });
+      });
+    } else {
+      manageMenu.button.hidden = true;
+    }
+
     this.scroll = watchScroll(
       this.scrollableContainer,
       this.#scrollUpdated.bind(this),
@@ -519,10 +539,16 @@ class PDFThumbnailViewer {
       selectedPages.clear();
       this.#pageNumberToRemove = NaN;
 
-      this.eventBus.dispatch("pagesedited", {
-        source: this,
-        pagesMapper,
-      });
+      const isIdentity = (this.#manageSaveAsButton.disabled =
+        !this.#pagesMapper.hasBeenAltered());
+      if (!isIdentity) {
+        this.eventBus.dispatch("pagesedited", {
+          source: this,
+          pagesMapper,
+          index: newIndex,
+          pagesToMove,
+        });
+      }
 
       const newCurrentPageNumber = pagesMapper.getPageNumber(newCurrentPageId);
       setTimeout(() => {

web/viewer.html

@@ -187,7 +187,7 @@
                       </button>
                     </div>
                     <div id="viewsManagerStatus">
-                      <div id="viewsManagerStatusAction" class="hidden">
+                      <div id="viewsManagerStatusAction">
                         <span
                           id="viewsManagerStatusActionLabel"
                           class="viewsManagerStatusLabel"
@@ -207,22 +207,22 @@
                           </button>
                           <menu id="viewsManagerStatusActionOptions" class="popupMenu">
                             <li>
-                              <button id="viewsManagerStatusActionCopy" class="noIcon" role="menuitem" type="button" tabindex="0">
+                              <button id="viewsManagerStatusActionCopy" class="noIcon" role="menuitem" type="button" tabindex="0" disabled>
                                 <span data-l10n-id="pdfjs-views-manager-pages-status-copy-button-label"></span>
                               </button>
                             </li>
                             <li>
-                              <button id="viewsManagerStatusActionCut" class="noIcon" role="menuitem" type="button" tabindex="0">
+                              <button id="viewsManagerStatusActionCut" class="noIcon" role="menuitem" type="button" tabindex="0" disabled>
                                 <span data-l10n-id="pdfjs-views-manager-pages-status-cut-button-label"></span>
                               </button>
                             </li>
                             <li>
-                              <button id="viewsManagerStatusActionDelete" class="noIcon" role="menuitem" type="button" tabindex="0">
+                              <button id="viewsManagerStatusActionDelete" class="noIcon" role="menuitem" type="button" tabindex="0" disabled>
                                 <span data-l10n-id="pdfjs-views-manager-pages-status-delete-button-label"></span>
                               </button>
                             </li>
                             <li>
-                              <button id="viewsManagerStatusActionSaveAs" class="noIcon" role="menuitem" type="button" tabindex="0">
+                              <button id="viewsManagerStatusActionSaveAs" class="noIcon" role="menuitem" type="button" tabindex="0" disabled>
                                 <span data-l10n-id="pdfjs-views-manager-pages-status-save-as-button-label"></span>
                               </button>
                             </li>

web/viewer.js

@@ -132,6 +132,14 @@ function getViewerConfiguration() {
       viewsManagerHeaderLabel: document.getElementById(
         "viewsManagerHeaderLabel"
       ),
+      manageMenu: {
+        button: document.getElementById("viewsManagerStatusActionButton"),
+        menu: document.getElementById("viewsManagerStatusActionOptions"),
+        copy: document.getElementById("viewsManagerStatusActionCopy"),
+        cut: document.getElementById("viewsManagerStatusActionCut"),
+        delete: document.getElementById("viewsManagerStatusActionDelete"),
+        saveAs: document.getElementById("viewsManagerStatusActionSaveAs"),
+      },
     },
     findBar: {
       bar: document.getElementById("findbar"),