feat: have RenderedWorkspaceComment implement IBoundedElement and IRenderedElement (#7919)

* feat: implement IBoundedElement

* feat: implement IRenderedElement

core/comments/rendered_workspace_comment.ts

@@ -7,9 +7,16 @@
 import {WorkspaceComment} from './workspace_comment.js';
 import {WorkspaceSvg} from '../workspace_svg.js';
 import {CommentView} from './comment_view.js';
-import {Coordinate, Size} from '../utils.js';
+import {Coordinate} from '../utils/coordinate.js';
+import {Rect} from '../utils/rect.js';
+import {Size} from '../utils/size.js';
+import {IBoundedElement} from '../interfaces/i_bounded_element.js';
+import {IRenderedElement} from '../interfaces/i_rendered_element.js';
 
-export class RenderedWorkspaceComment extends WorkspaceComment {
+export class RenderedWorkspaceComment
+  extends WorkspaceComment
+  implements IBoundedElement, IRenderedElement
+{
   /** The class encompassing the svg elements making up the workspace comment. */
   private view: CommentView;
 
@@ -72,6 +79,26 @@ export class RenderedWorkspaceComment extends WorkspaceComment {
     this.view.setEditable(this.isEditable());
   }
 
+  /** Returns the root SVG element of this comment. */
+  getSvgRoot(): SVGElement {
+    return this.view.getSvgRoot();
+  }
+
+  /** Returns the bounding rectangle of this comment in workspace coordinates. */
+  getBoundingRectangle(): Rect {
+    const loc = this.getRelativeToSurfaceXY();
+    const size = this.getSize();
+    return new Rect(loc.y, loc.y + size.height, loc.x, loc.x + size.width);
+  }
+
+  /** Move the comment by the given amounts in workspace coordinates. */
+  moveBy(dx: number, dy: number, _reason?: string[] | undefined): void {
+    // TODO(#7909): Deal with reason when we add events.
+    const loc = this.getRelativeToSurfaceXY();
+    const newLoc = new Coordinate(loc.x + dx, loc.y + dy);
+    this.moveTo(newLoc);
+  }
+
   /** Moves the comment to the given location in workspace coordinates. */
   override moveTo(location: Coordinate): void {
     super.moveTo(location);