The author details how a month‑long personal project uses HTML Canvas to implement a fully functional resume editor, covering custom data structures, undo/redo history, layered rendering, event handling, focus management, infinite canvas support, performance tricks, and future enhancements.
This article walks through creating a fully customizable, high‑performance HTML5 canvas drawing board for online teaching, covering devicePixelRatio handling, responsive layout, touch and mouse event processing, drawing pipelines, multi‑touch support, erasing modes, caching strategies, undo/redo, and brush extensions, all with complete React code examples.
The article explains how Notion implements a block‑tree data model and a controlled contenteditable editor using React, detailing the data layer, operation (op) system, rendering components, selection handling, text styling, and copy‑paste mechanisms, all backed by transactional undo/redo logic.
This article explains how iOS keyboards achieve undo and redo functionality by combining the Command and Observer design patterns, illustrates their class structures, and shows how the NSUndoManager leverages these patterns to manage undo and redo stacks in Cocoa Touch applications.
