Performance

class Performance extends EventTarget

Annotations: @SupportedBrowser.new(SupportedBrowser.CHROME), @SupportedBrowser.new(SupportedBrowser.FIREFOX), @SupportedBrowser.new(SupportedBrowser.IE), @Native.new("Performance")

Inheritance

Object → EventTarget → Performance

Properties

hashCode no setter inherited

int get hashCode

Inherited from Interceptor.

Implementation

int get hashCode => Primitives.objectHashCode(this);

memory no setter

MemoryInfo? get memory

Implementation

MemoryInfo? get memory native;

navigation no setter

PerformanceNavigation get navigation

Implementation

PerformanceNavigation get navigation native;

on no setter inherited

Events get on

This is an ease-of-use accessor for event streams which should only be used when an explicit accessor is not available.

Inherited from EventTarget.

Implementation

Events get on => new Events(this);

runtimeType no setter inherited

Type get runtimeType

Inherited from Interceptor.

Implementation

Type get runtimeType =>
    getRuntimeTypeOfInterceptorNotArray(getInterceptor(this), this);

timeOrigin no setter

num? get timeOrigin

Implementation

num? get timeOrigin native;

timing no setter

PerformanceTiming get timing

Implementation

PerformanceTiming get timing native;

Methods

addEventListener() inherited

void addEventListener(
  String type,
  (dynamic Function(Event event))? listener, [
  bool? useCapture,
])

Inherited from EventTarget.

Implementation

void addEventListener(
  String type,
  EventListener? listener, [
  bool? useCapture,
]) {
  // TODO(leafp): This check is avoid a bug in our dispatch code when
  // listener is null.  The browser treats this call as a no-op in this
  // case, so it's fine to short-circuit it, but we should not have to.
  if (listener != null) {
    _addEventListener(type, listener, useCapture);
  }
}

clearMarks()

void clearMarks(String? markName)

Implementation

void clearMarks(String? markName) native;

clearMeasures()

void clearMeasures(String? measureName)

Implementation

void clearMeasures(String? measureName) native;

clearResourceTimings()

void clearResourceTimings()

Implementation

void clearResourceTimings() native;

dispatchEvent() inherited

bool dispatchEvent(Event event)

Inherited from EventTarget.

Implementation

bool dispatchEvent(Event event) native;

getEntries()

List<PerformanceEntry> getEntries()

Implementation

List<PerformanceEntry> getEntries() native;

getEntriesByName()

List<PerformanceEntry> getEntriesByName(String name, String? entryType)

Implementation

List<PerformanceEntry> getEntriesByName(
  String name,
  String? entryType,
) native;

getEntriesByType()

List<PerformanceEntry> getEntriesByType(String entryType)

Implementation

List<PerformanceEntry> getEntriesByType(String entryType) native;

mark()

PerformanceEntry? mark(String markName, [Map<dynamic, dynamic>? markOptions])

Implementation

PerformanceEntry? mark(String markName, [Map? markOptions]) {
  if (markOptions != null) {
    var markOptions_1 = convertDartToNative_Dictionary(markOptions);
    return _mark_1(markName, markOptions_1);
  }
  return _mark_2(markName);
}

measure()

PerformanceMeasure? measure(
  String measureName, [
  dynamic measureOptions_OR_startMark,
  String? endMark,
])

Implementation

PerformanceMeasure? measure(
  String measureName, [
  measureOptions_OR_startMark,
  String? endMark,
]) {
  if (measureOptions_OR_startMark == null && endMark == null) {
    return _measure_1(measureName);
  }
  if ((measureOptions_OR_startMark is String ||
          measureOptions_OR_startMark == null) &&
      endMark == null) {
    return _measure_2(measureName, measureOptions_OR_startMark);
  }
  if ((measureOptions_OR_startMark is String ||
      measureOptions_OR_startMark == null)) {
    return _measure_3(measureName, measureOptions_OR_startMark, endMark);
  }
  if ((measureOptions_OR_startMark is Map) && endMark == null) {
    var measureOptions_1 = convertDartToNative_Dictionary(
      measureOptions_OR_startMark,
    );
    return _measure_4(measureName, measureOptions_1);
  }
  throw new ArgumentError("Incorrect number or type of arguments");
}

noSuchMethod() inherited

dynamic noSuchMethod(Invocation invocation)

Invoked when a nonexistent method or property is accessed.

A dynamic member invocation can attempt to call a member which doesn't exist on the receiving object. Example:

dynamic object = 1;
object.add(42); // Statically allowed, run-time error

This invalid code will invoke the noSuchMethod method of the integer 1 with an Invocation representing the .add(42) call and arguments (which then throws).

Classes can override noSuchMethod to provide custom behavior for such invalid dynamic invocations.

A class with a non-default noSuchMethod invocation can also omit implementations for members of its interface. Example:

class MockList<T> implements List<T> {
  noSuchMethod(Invocation invocation) {
    log(invocation);
    super.noSuchMethod(invocation); // Will throw.
  }
}
void main() {
  MockList().add(42);
}

This code has no compile-time warnings or errors even though the MockList class has no concrete implementation of any of the List interface methods. Calls to List methods are forwarded to noSuchMethod, so this code will log an invocation similar to Invocation.method(#add, [42]) and then throw.

If a value is returned from noSuchMethod, it becomes the result of the original invocation. If the value is not of a type that can be returned by the original invocation, a type error occurs at the invocation.

The default behavior is to throw a NoSuchMethodError.

Inherited from Interceptor.

Implementation

dynamic noSuchMethod(Invocation invocation) {
  throw NoSuchMethodError.withInvocation(this, invocation);
}

now()

double now()

Implementation

double now() native;

removeEventListener() inherited

void removeEventListener(
  String type,
  (dynamic Function(Event event))? listener, [
  bool? useCapture,
])

Inherited from EventTarget.

Implementation

void removeEventListener(
  String type,
  EventListener? listener, [
  bool? useCapture,
]) {
  // TODO(leafp): This check is avoid a bug in our dispatch code when
  // listener is null.  The browser treats this call as a no-op in this
  // case, so it's fine to short-circuit it, but we should not have to.
  if (listener != null) {
    _removeEventListener(type, listener, useCapture);
  }
}

setResourceTimingBufferSize()

void setResourceTimingBufferSize(int maxSize)

Implementation

void setResourceTimingBufferSize(int maxSize) native;

toString() inherited

String toString()

A string representation of this object.

Some classes have a default textual representation, often paired with a static parse function (like int.parse). These classes will provide the textual representation as their string representation.

Other classes have no meaningful textual representation that a program will care about. Such classes will typically override toString to provide useful information when inspecting the object, mainly for debugging or logging.

Inherited from Interceptor.

Implementation

String toString() => Primitives.objectToHumanReadableString(this);

Operators

operator ==() inherited

bool operator ==(Object other)

The equality operator.

The default behavior for all Objects is to return true if and only if this object and other are the same object.

Override this method to specify a different equality relation on a class. The overriding method must still be an equivalence relation. That is, it must be:

• Total: It must return a boolean for all arguments. It should never throw.

• Reflexive: For all objects o, o == o must be true.

• Symmetric: For all objects o1 and o2, o1 == o2 and o2 == o1 must either both be true, or both be false.

• Transitive: For all objects o1, o2, and o3, if o1 == o2 and o2 == o3 are true, then o1 == o3 must be true.

The method should also be consistent over time, so whether two objects are equal should only change if at least one of the objects was modified.

If a subclass overrides the equality operator, it should override the hashCode method as well to maintain consistency.

Inherited from Interceptor.

Implementation

bool operator ==(Object other) => identical(this, other);

Static Properties

supported no setter

bool get supported

Checks if this type is supported on the current platform.

Implementation

static bool get supported => JS('bool', '!!(window.performance)');