void _updatePosition()
{
this._configuration = ScrollConfiguration.of(this.context);
this._physics = this._configuration.getScrollPhysics(this.context);
if (this.widget.physics != null)
{
this._physics = this.widget.physics.applyTo(this._physics);
}
ScrollController controller = this.widget.controller;
ScrollPosition oldPosition = this.position;
if (oldPosition != null)
{
if (controller != null)
{
controller.detach(oldPosition);
}
Window.instance.scheduleMicrotask(oldPosition.dispose);
}
this._position = controller == null
? null
: controller.createScrollPosition(this._physics, this, oldPosition);
this._position = this._position
?? new ScrollPositionWithSingleContext(physics: this._physics, context: this,
oldPosition: oldPosition);
D.assert(this.position != null);
if (controller != null)
{
controller.attach(this.position);
}
}
public static ScrollBehavior of(BuildContext context)
{
ScrollConfiguration configuration = context.dependOnInheritedWidgetOfExactType <ScrollConfiguration>();
if (configuration != null)
{
return(configuration.behavior);
}
return(new ScrollBehavior());
}
public static ScrollBehavior of(BuildContext context)
{
ScrollConfiguration configuration =
(ScrollConfiguration)context.inheritFromWidgetOfExactType(typeof(ScrollConfiguration));
if (configuration != null)
{
return(configuration.behavior);
}
return(new ScrollBehavior());
}
void _updatePosition()
{
_configuration = ScrollConfiguration.of(context);
_physics = _configuration.getScrollPhysics(context);
if (widget.physics != null)
{
_physics = widget.physics.applyTo(_physics);
}
ScrollController controller = widget.controller;
ScrollPosition oldPosition = position;
if (oldPosition != null)
{
if (controller != null)
{
controller.detach(oldPosition);
}
async_.scheduleMicrotask(() => {
oldPosition.dispose();
return(null);
});
}
if (controller == null)
{
_position = new ScrollPositionWithSingleContext(physics: _physics, context: this, oldPosition: oldPosition);
}
else
{
_position = controller?.createScrollPosition(_physics, this, oldPosition)
?? new ScrollPositionWithSingleContext(physics: _physics, context: this, oldPosition: oldPosition);
}
D.assert(position != null);
if (controller != null)
{
controller.attach(position);
}
}
