BindingBase class
Base class for mixins that provide singleton services (also known as "bindings").
To use this class in an on
clause of a mixin, inherit from it and implement
initInstances(). The mixin is guaranteed to only be constructed once in
the lifetime of the app (more precisely, it will assert if constructed twice
in checked mode).
The top-most layer used to write the application will have a concrete class that inherits from BindingBase and uses all the various BindingBase mixins (such as ServicesBinding). For example, the Widgets library in Flutter introduces a binding called WidgetsFlutterBinding. The relevant library defines how to create the binding. It could be implied (for example, WidgetsFlutterBinding is automatically started from runApp), or the application might be required to explicitly call the constructor.
Constructors
- BindingBase()
- Default abstract constructor for bindings. [...]
Properties
- locked → bool
-
Whether lockEvents is currently locking events. [...]
@protected, read-only
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
initInstances(
) → void -
The initialization method. Subclasses override this method to hook into
the platform and otherwise configure their services. Subclasses must call
"super.initInstances()". [...]
@mustCallSuper, @protected
-
initServiceExtensions(
) → void -
Called when the binding is initialized, to register service
extensions. [...]
@mustCallSuper, @protected
-
lockEvents(
Future< void> callback()) → Future< void> -
Locks the dispatching of asynchronous events and callbacks until the
callback's future completes. [...]
@protected
-
performReassemble(
) → Future< void> -
This method is called by reassembleApplication to actually cause the
application to reassemble, e.g. after a hot reload. [...]
@mustCallSuper, @protected
-
reassembleApplication(
) → Future< void> - Cause the entire application to redraw, e.g. after a hot reload. [...]
-
registerBoolServiceExtension(
{String name, AsyncValueGetter< bool> getter, AsyncValueSetter< bool> setter }) → void -
Registers a service extension method with the given name (full
name "ext.flutter.name"), which takes a single argument
"enabled" which can have the value "true" or the value "false"
or can be omitted to read the current value. (Any value other
than "true" is considered equivalent to "false". Other arguments
are ignored.) [...]
@protected
-
registerNumericServiceExtension(
{String name, AsyncValueGetter< double> getter, AsyncValueSetter< double> setter }) → void -
Registers a service extension method with the given name (full
name "ext.flutter.name"), which takes a single argument with the
same name as the method which, if present, must have a value
that can be parsed by double.parse, and can be omitted to read
the current value. (Other arguments are ignored.) [...]
@protected
-
registerServiceExtension(
{String name, ServiceExtensionCallback callback }) → void -
Registers a service extension method with the given name (full name
"ext.flutter.name"). [...]
@protected
-
registerSignalServiceExtension(
{String name, AsyncCallback callback }) → void -
Registers a service extension method with the given name (full
name "ext.flutter.name"), which takes no arguments and returns
no value. [...]
@protected
-
registerStringServiceExtension(
{String name, AsyncValueGetter< String> getter, AsyncValueSetter< String> setter }) → void -
Registers a service extension method with the given name (full name
"ext.flutter.name"), which optionally takes a single argument with the
name "value". If the argument is omitted, the value is to be read,
otherwise it is to be set. Returns the current value. [...]
@protected
-
toString(
) → String -
Returns a string representation of this object.
override
-
unlocked(
) → void -
Called by lockEvents when events get unlocked. [...]
@mustCallSuper, @protected
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
Operators
-
operator ==(
dynamic other) → bool -
The equality operator. [...]
inherited