platformDispatcher property
The ui.PlatformDispatcher to which this binding is bound.
A number of additional bindings are defined as extensions of BindingBase, e.g., ServicesBinding, RendererBinding, and WidgetsBinding. Each of these bindings define behaviors that interact with a ui.PlatformDispatcher, e.g., ServicesBinding registers listeners with the ChannelBuffers, RendererBinding registers ui.PlatformDispatcher.onMetricsChanged, ui.PlatformDispatcher.onTextScaleFactorChanged, and SemanticsBinding registers ui.PlatformDispatcher.onSemanticsEnabledChanged, ui.PlatformDispatcher.onSemanticsActionEvent, and ui.PlatformDispatcher.onAccessibilityFeaturesChanged handlers.
Each of these other bindings could individually access a
ui.PlatformDispatcher statically, but that would preclude the ability to
test these behaviors with a fake platform dispatcher for verification
purposes. Therefore, BindingBase exposes this ui.PlatformDispatcher
for use by other bindings. A subclass of BindingBase, such as
TestWidgetsFlutterBinding, can override this accessor to return a
different ui.PlatformDispatcher implementation.
Implementation
ui.PlatformDispatcher get platformDispatcher => ui.PlatformDispatcher.instance;