Finder class Null safety

Searches a widget tree and returns nodes that match a particular pattern.

Implementers

Constructors

Finder({bool skipOffstage})
Initializes a Finder. Used by subclasses to initialize the skipOffstage property.

Properties

allCandidates Iterable<Element>
Returns all the Elements that will be considered by this finder. [...]
@protected, read-only
description String
Describes what the finder is looking for. The description should be a brief English noun phrase describing the finder's pattern.
read-only
first Finder
Returns a variant of this finder that only matches the first element matched by this finder.
read-only
hashCode int
The hash code for this object. [...]
read-only, inherited
last Finder
Returns a variant of this finder that only matches the last element matched by this finder.
read-only
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
skipOffstage bool
Whether this finder skips nodes that are offstage. [...]
final

Methods

apply(Iterable<Element> candidates) Iterable<Element>
Returns all the elements in the given list that match this finder's pattern. [...]
at(int index) Finder
Returns a variant of this finder that only matches the element at the given index matched by this finder.
evaluate() Iterable<Element>
Returns the current result. If precache was called and returned true, this will cheaply return the result that was computed then. Otherwise, it creates a new iterable to compute the answer. [...]
hitTestable({Alignment at = Alignment.center}) Finder
Returns a variant of this finder that only matches elements reachable by a hit test. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
precache() bool
Attempts to evaluate the finder. Returns whether any elements in the tree matched the finder. If any did, then the result is cached and can be obtained from evaluate. [...]
toString() String
A string representation of this object. [...]
override

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited