Software Design

Command Pattern: Undoable Text Operations

UML Class Diagrams · made in Skemio

UML class diagram demonstrating Command pattern with Editor invoker, Command interface, InsertTextCommand, and Document receiver.
UML class diagram demonstrating Command pattern with Editor invoker, Command interface, InsertTextCommand, and Document receiver.
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What it shows

  • Encapsulate every edit operation as a standalone Command object.
  • Store prior text state inside the command for symmetric undo operations.
  • The history manager pushes and pops commands across undo and redo stacks.

The takeaway

Turn user actions into objects to unlock reversible execution and command history.

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