OffsetChangeObserver class
OffsetChangeObserver will observe the offset status of the widget.
Use of this observer requires widget inheritance WidgetsBindingObserver
Constructors
- OffsetChangeObserver({required BuildContext context, required OffsetChangedCallback onChanged, KeyboardStateCallback? onKeyboard})
- Create an observer who needs to observe the offset state of the widget.
Properties
- context → BuildContext
-
context is the context object of the widget that needs to be observed.
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- onChanged → OffsetChangedCallback
-
Callback method when offset occurs.
final
- onKeyboard → KeyboardStateCallback?
-
Callback method when keyboard state occurs.
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
onChangeDependencies(
) → void - Called when a dependency of this State object changes.
-
onChangeMetrics(
) → Future< void> - Called when the application's dimensions change.
-
onChangeState(
) → void - Called when the state changes.
-
onDispose(
) → void - Called when this object is removed from the tree permanently.
-
onInitState(
) → void - Initialization state.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited