SurveyController class

Holds the in-progress state of one survey showing: the answers collected so far, the position in the (possibly branching) node graph, and the back-stack for the Back button.

A ChangeNotifier port of the Android SurveyViewModel. Lives for the lifetime of one showing so answers survive rebuilds.

Inheritance

Constructors

SurveyController(SurveyConfigModel survey)

Properties

answers → Map<String, SurveyAnswer>
nodeId → answer.
final
canGoBack → bool
no setter
currentBlock → SurveyBlock?
no setter
currentNode → SurveyNode?
no setter
currentNodeId → String
no setter
hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
isComplete → bool
no setter
progress → double
Coarse progress estimate based on traversal depth, not graph topology.
no setter
progressStep → int
Respondent traversal depth (1-based) — the number of nodes reached so far, accounting for back navigation. Mirrors Android's SurveyViewModel progressStep and is reported as analytics item_index.
no setter
redirectUrl → String?
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
survey → SurveyConfigModel
final

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
advance() → void
Records the current answer and moves to the branching-decided next node.
back() → void
canAdvance() → bool
Whether the current node may be left — required questions must be answered.
dispose() → void
Discards any resources used by the object.
inherited
nextBlockIsResultPage() → bool
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
inherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
responsePayload() → Map<String, dynamic>
The collected answers as a serialisable map, for the Completed event.
setAnswer(String nodeId, SurveyAnswer answer) → void
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited