2926 bug undo feature of multitool delete your upload file (#3101)

# Description of Changes

Please provide a summary of the changes, including:

- What was changed
Added support for single page and multi page undo/redo drag and drop in
multitool
removed selecting pages from undo/redo stack

- Why the change was made
Drag and drop was not supported fully with undo/redo functionality


Closes #(2926)

---

## [Checklist]


### General

- [X] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [X] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [X] I have performed a self-review of my code
- [X] My changes generate no new warnings

### Documentation

### UI Changes

I Will start a demo in PR so people can try the new functionality

[numberedpages.pdf](https://github.com/user-attachments/files/19043978/numberedpages.pdf)
Please feel free to use this PDF to aid with trying out the new
functionality

### Testing (if applicable)


- [X] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/resources/static/js/multitool/DragDropManager.js

@@ -39,7 +39,7 @@ class DragDropManager {
       // Multi-page drag logic
       this.selectedPageElements = window.selectedPages
         .map((index) => {
-          const pageEl = document.getElementById(`page-container-${index}`);
+          const pageEl = Array.from(this.wrapper.childNodes)[index];
           if (pageEl) {
             pageEl.initialTransform = pageEl.style.transform || 'translate(0px, 0px)';
             pageEl.classList.add('drag-manager_dragging');
@@ -114,13 +114,15 @@ class DragDropManager {
       } else {
         this.selectedPageElements.forEach((pageEl) => {
           pageEl.classList.remove('drag-manager_dragging');
+        });
 
-          if (this.hoveredEl === this.endInsertionElement) {
-            this.movePageTo(pageEl);
-          } else {
-            this.movePageTo(pageEl, this.hoveredEl);
-          }
+        this.movePageTo(
+          this.selectedPageElements,
+          this.hoveredEl === this.endInsertionElement
+            ? null
+            : this.hoveredEl);
 
+        this.selectedPageElements.forEach((pageEl) => {
           // Handle timeout for the current element
           this.handleTimeoutForElement(pageEl);
         });

src/main/resources/static/js/multitool/PdfActionsManager.js

@@ -35,8 +35,7 @@ class PdfActionsManager {
 
     const sibling = imgContainer.previousSibling;
     if (sibling) {
-      let movePageCommand = this.movePageTo(imgContainer, sibling, true, true);
-      this._pushUndoClearRedo(movePageCommand);
+      this.movePageTo(imgContainer, sibling, true);
     }
   }
 
@@ -44,12 +43,11 @@ class PdfActionsManager {
     var imgContainer = this.getPageContainer(e.target);
     const sibling = imgContainer.nextSibling;
     if (sibling) {
-      let movePageCommand = this.movePageTo(
+      this.movePageTo(
         imgContainer,
         sibling.nextSibling,
         true
       );
-      this._pushUndoClearRedo(movePageCommand);
     }
   }
 
@@ -185,8 +183,6 @@ class PdfActionsManager {
       const pageNumber = Array.from(div.parentNode.children).indexOf(div) + 1;
       let selectPageCommand = new SelectPageCommand(pageNumber, selectCheckbox);
       selectPageCommand.execute();
-
-      this._pushUndoClearRedo(selectPageCommand);
     };
 
     const insertFileButtonContainer = document.createElement("div");

src/main/resources/static/js/multitool/PdfContainer.js

@@ -1,4 +1,4 @@
-import { MovePageUpCommand, MovePageDownCommand } from './commands/move-page.js';
+import { MovePageCommand } from './commands/move-page.js';
 import { RemoveSelectedCommand } from './commands/remove.js';
 import { RotateAllCommand, RotateElementCommand } from './commands/rotate.js';
 import { SplitAllCommand } from './commands/split.js';
@@ -6,6 +6,7 @@ import { UndoManager } from './UndoManager.js';
 import { PageBreakCommand } from './commands/page-break.js';
 import { AddFilesCommand } from './commands/add-page.js';
 import { DecryptFile } from '../DecryptFiles.js';
+import { CommandSequence } from './commands/commands-sequence.js';
 
 class PdfContainer {
   fileName;
@@ -109,27 +110,41 @@ class PdfContainer {
     downloadBtn.disabled = true;
   }
 
-  movePageTo(startElement, endElement, scrollTo = false, moveUp = false) {
-    let movePageCommand;
-    if (moveUp) {
-      movePageCommand = new MovePageUpCommand(
-        startElement,
+  movePagesTo(startElements, endElement, scrollTo = false) {
+    let commands = [];
+    startElements.forEach((page) => {
+      let command = new MovePageCommand(
+        page,
         endElement,
         this.pagesContainer,
         this.pagesContainerWrapper,
         scrollTo
-      );
-    } else {
-      movePageCommand = new MovePageDownCommand(
-        startElement,
-        endElement,
-        this.pagesContainer,
-        this.pagesContainerWrapper,
-        scrollTo
-      );
+      )
+      command.execute();
+      commands.push(command);
+    })
+
+    let commandSequence = new CommandSequence(commands);
+    this.undoManager.pushUndoClearRedo(commandSequence);
+    return commandSequence;
+  }
+
+  movePageTo(startElements, endElement, scrollTo = false) {
+
+    if (Array.isArray(startElements)){
+      return this.movePagesTo(startElements, endElement, scrollTo = false);
     }
 
+    let movePageCommand = new MovePageCommand(
+      startElements,
+      endElement,
+      this.pagesContainer,
+      this.pagesContainerWrapper,
+      scrollTo
+    );
+
     movePageCommand.execute();
+    this.undoManager.pushUndoClearRedo(movePageCommand);
     return movePageCommand;
   }
 

src/main/resources/static/js/multitool/commands/add-page.js

@@ -34,12 +34,10 @@ export class AddFilesCommand extends Command {
 
       if (this.pagesContainer.childElementCount === 0) {
         const filenameInput = document.getElementById('filename-input');
-        const filenameParagraph = document.getElementById('filename');
         const downloadBtn = document.getElementById('export-button');
 
         filenameInput.disabled = true;
         filenameInput.value = '';
-        filenameParagraph.innerText = '';
         downloadBtn.disabled = true;
       }
 

src/main/resources/static/js/multitool/commands/commands-sequence.js

@@ -0,0 +1,20 @@
+import {Command} from './command.js';
+
+export class CommandSequence extends Command {
+  constructor(commands) {
+    super();
+    this.commands = commands;
+
+  }
+  execute() {
+   this.commands.forEach((command) => command.execute())
+  }
+
+  undo() {
+   this.commands.slice().reverse().forEach((command) => command.undo())
+  }
+
+  redo() {
+    this.execute();
+  }
+}

src/main/resources/static/js/multitool/commands/move-page.js

@@ -1,6 +1,6 @@
 import {Command} from './command.js';
 
-export class AbstractMovePageCommand extends Command {
+export class MovePageCommand extends Command {
   constructor(startElement, endElement, pagesContainer, pagesContainerWrapper, scrollTo = false) {
     super();
 
@@ -16,7 +16,6 @@ export class AbstractMovePageCommand extends Command {
     this.scrollTo = scrollTo;
     this.pagesContainerWrapper = pagesContainerWrapper;
   }
-
   execute() {
     // Check & remove page number elements here too if they exist because Firefox doesn't fire the relevant event on page move.
     const pageNumberElement = this.startElement.querySelector('.page-number');
@@ -42,51 +41,11 @@ export class AbstractMovePageCommand extends Command {
   }
 
   undo() {
-    // Requires overriding in child classes
-  }
-
-  redo() {
-    this.execute();
-  }
-}
-
-export class MovePageUpCommand extends AbstractMovePageCommand {
-  constructor(startElement, endElement, pagesContainer, pagesContainerWrapper, scrollTo = false) {
-    super(startElement, endElement, pagesContainer, pagesContainerWrapper, scrollTo);
-  }
-
-  undo() {
-    if (this.endElement) {
-      this.pagesContainer.removeChild(this.endElement);
-      this.startElement.insertAdjacentElement('beforebegin', this.endElement);
-    }
-
-    if (this.scrollTo) {
-      const {width} = this.startElement.getBoundingClientRect();
-      const vector = this.endIndex === -1 || this.startIndex <= this.endIndex ? 0 - width : width;
-
-      this.pagesContainerWrapper.scroll({
-        left: this.pagesContainerWrapper.scrollLeft - vector,
-      });
-    }
-  }
-
-  redo() {
-    this.execute();
-  }
-}
-
-export class MovePageDownCommand extends AbstractMovePageCommand {
-  constructor(startElement, endElement, pagesContainer, pagesContainerWrapper, scrollTo = false) {
-    super(startElement, endElement, pagesContainer, pagesContainerWrapper, scrollTo);
-  }
-
-  undo() {
-    let previousElement = this.startElement.previousSibling;
-
     if (this.startElement) {
       this.pagesContainer.removeChild(this.startElement);
-      previousElement.insertAdjacentElement('beforebegin', this.startElement);
+      let previousNeighbour = Array.from(this.pagesContainer.childNodes)[this.startIndex];
+      previousNeighbour?.insertAdjacentElement('beforebegin', this.startElement)
+        ?? this.pagesContainer.append(this.startElement);
     }
 
     if (this.scrollTo) {