TextMetrics

class TextMetrics extends JavaScriptObject

Annotations: @Native.new("TextMetrics")

Properties

actualBoundingBoxAscent no setter

num? get actualBoundingBoxAscent

Implementation

num? get actualBoundingBoxAscent native;

actualBoundingBoxDescent no setter

num? get actualBoundingBoxDescent

Implementation

num? get actualBoundingBoxDescent native;

actualBoundingBoxLeft no setter

num? get actualBoundingBoxLeft

Implementation

num? get actualBoundingBoxLeft native;

actualBoundingBoxRight no setter

num? get actualBoundingBoxRight

Implementation

num? get actualBoundingBoxRight native;

alphabeticBaseline no setter

num? get alphabeticBaseline

Implementation

num? get alphabeticBaseline native;

emHeightAscent no setter

num? get emHeightAscent

Implementation

num? get emHeightAscent native;

emHeightDescent no setter

num? get emHeightDescent

Implementation

num? get emHeightDescent native;

fontBoundingBoxAscent no setter

num? get fontBoundingBoxAscent

Implementation

num? get fontBoundingBoxAscent native;

fontBoundingBoxDescent no setter

num? get fontBoundingBoxDescent

Implementation

num? get fontBoundingBoxDescent native;

hangingBaseline no setter

num? get hangingBaseline

Implementation

num? get hangingBaseline native;

hashCode no setter inherited

int get hashCode

Inherited from Interceptor.

Implementation

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

ideographicBaseline no setter

num? get ideographicBaseline

Implementation

num? get ideographicBaseline native;

runtimeType no setter inherited

Type get runtimeType

Inherited from Interceptor.

Implementation

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

width no setter

num? get width

Implementation

num? get width native;

Methods

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);
}

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);