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 setterinherited
-
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 setterinherited
Methods
-
clear()
→ History<S>
-
Clear the history stacks while keeping 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), {String? label})
→ History<S>
-
Apply
op to the current present, pushing the old present to past,
clearing future. label is accepted for UI logging but not stored.
-
toString()
→ String
-
A string representation of this object.
inherited
-
undo()
→ History<S>
-
Undo to the previous state, if available.
-
withPresent(S next, {String? label})
→ History<S>
-
Replace the present with
next (equivalent to reduce((_) => next)).
