ColdStartTimer class

Measures how long the app took to render its first frame.

start is called at the top of FlutterDevToolkit.init; the timer stops on the first post-frame callback. The result is therefore "time from toolkit init to first frame", which is as close to a cold start as a package can observe without platform hooks — it excludes engine boot and Dart VM startup that happen before main() runs.

Constructors

ColdStartTimer()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Properties

coldStart → Duration?

Null until the first frame has rendered.

no setter

version → ValueNotifier<int>

Bumped once the measurement lands, so the Performance tab can refresh.

final

Static Methods

reset() → void

Clears the measurement so start can be called again. Test-only.

start() → void

Starts timing. A no-op if already running or already measured once this session.