History<S> class

Constructors

History(S present, {int limit = 100})

Create a new history with an initial present state.

Properties

canRedo → bool

Whether a redo is possible.

no setter

canUndo → bool

Whether an undo is possible.

no setter

futureLength → int

Number of items in the future stack.

no setter

hashCode → int

The hash code for this object.

no setter, inherited

limit → int

Maximum number of entries retained in the past stack. (Present is always retained; future is unbounded except by usage.)

final

pastLength → int

Number of items in the past stack.

no setter

present → S

The current value.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

clear() → History<S>

Clears the history stacks while retaining the current present.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

redo() → History<S>

Redo to the next state, if available.

reduce(S op(S)) → History<S>

Applies op to the current present, pushes the previous value to the past stack, and clears the future stack.

toString() → String

A string representation of this object.

inherited

undo() → History<S>

Undo to the previous state, if available.

withPresent(S next) → History<S>

Replaces the current present with next.

Operators

operator ==(Object other) → bool

The equality operator.

inherited