Crate undo

Provides undo-redo functionality with dynamic dispatch and automatic command merging.

• Record provides a stack based undo-redo functionality.
• History provides a tree based undo-redo functionality that allows you to jump between different branches.
• Queue wraps a Record or History and provides batch queue functionality.
• Checkpoint wraps a Record or History and provides checkpoint functionality.
• Commands can be merged using the merge! macro or the merge method. When two commands are merged, undoing and redoing them are done in a single step.
• Configurable display formatting is provided when the display feature is enabled.
• Time stamps and time travel is provided when the chrono feature is enabled.

Macros

merge

Macro for merging commands.

Structs

Checkpoint	A checkpoint wrapper.
Error	An error which holds the command that caused it.
History	A history of commands.
HistoryBuilder	Builder for a History.
Merged	The result of merging two commands.
Queue	A command queue wrapper.
Record	A record of commands.
RecordBuilder	Builder for a record.

Enums

Merge	Says if the command should merge with another command.
Signal	The signal sent when the record, the history, or the receiver changes.

Traits

Command

Base functionality for all commands.

Type Definitions

Result

A specialized Result type for undo-redo operations.