public static PageView builder(
IndexedWidgetBuilder itemBuilder,
Key key = null,
Axis scrollDirection = Axis.horizontal,
bool reverse = false,
PageController controller = null,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
int itemCount = 0,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
)
{
return(new PageView(
itemBuilder: itemBuilder,
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
physics: physics,
pageSnapping: pageSnapping,
onPageChanged: onPageChanged,
itemCount: itemCount,
dragStartBehavior: dragStartBehavior
));
}
protected ScrollPosition(
ScrollPhysics physics = null,
ScrollContext context = null,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
)
{
D.assert(physics != null);
D.assert(context != null);
D.assert(context.vsync != null);
this.physics = physics;
this.context = context;
this.keepScrollOffset = keepScrollOffset;
this.debugLabel = debugLabel;
if (oldPosition != null)
{
this.absorb(oldPosition);
}
if (keepScrollOffset)
{
this.restoreScrollOffset();
}
}
public ScrollPositionWithSingleContext(
ScrollPhysics physics = null,
ScrollContext context = null,
float?initialPixels = 0.0f,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(
physics: physics,
context: context,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel
)
{
if (this._pixels == null && initialPixels != null)
{
this.correctPixels(initialPixels.Value);
}
if (this.activity == null)
{
this.goIdle();
}
D.assert(this.activity != null);
}
public SingleChildScrollView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
EdgeInsets padding = null,
bool?primary = null,
ScrollPhysics physics = null,
ScrollController controller = null,
Widget child = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(key: key)
{
D.assert(!(controller != null && primary == true),
() =>
"Primary ScrollViews obtain their ScrollController via inheritance from a PrimaryScrollController widget. " +
"You cannot both set primary to true and pass an explicit controller.");
this.scrollDirection = scrollDirection;
this.reverse = reverse;
this.padding = padding;
this.primary = primary ?? controller == null && scrollDirection == Axis.vertical;
this.physics = physics;
this.controller = controller;
this.child = child;
this.dragStartBehavior = dragStartBehavior;
}
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 PageView(
Key key = null,
Axis scrollDirection = Axis.horizontal,
bool reverse = false,
PageController controller = null,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
List <Widget> children = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
IndexedWidgetBuilder itemBuilder = null,
SliverChildDelegate childDelegate = null,
int itemCount = 0
) : base(key: key)
{
this.scrollDirection = scrollDirection;
this.reverse = reverse;
this.physics = physics;
this.pageSnapping = pageSnapping;
this.onPageChanged = onPageChanged;
this.dragStartBehavior = dragStartBehavior;
this.controller = controller ?? PageViewUtils._defaultPageController;
if (itemBuilder != null)
{
this.childrenDelegate = new SliverChildBuilderDelegate(itemBuilder, childCount: itemCount);
}
else if (childDelegate != null)
{
this.childrenDelegate = childDelegate;
}
else
{
this.childrenDelegate = new SliverChildListDelegate(children ?? new List <Widget>());
}
}
public static ListView custom(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
float?itemExtent = null,
SliverChildDelegate childrenDelegate = null,
float?cacheExtent = null
)
{
return(new ListView(
key,
scrollDirection,
reverse,
controller,
primary,
physics,
shrinkWrap,
padding,
itemExtent,
childrenDelegate,
cacheExtent));
}
bool _shouldUpdatePosition(Scrollable oldWidget)
{
ScrollPhysics newPhysics = widget.physics;
ScrollPhysics oldPhysics = oldWidget.physics;
do
{
Type newPhysicsType = newPhysics != null?newPhysics.GetType() : null;
Type oldPhysicsType = oldPhysics != null?oldPhysics.GetType() : null;
if (newPhysicsType != oldPhysicsType)
{
return(true);
}
if (newPhysics != null)
{
newPhysics = newPhysics.parent;
}
if (oldPhysics != null)
{
oldPhysics = oldPhysics.parent;
}
} while (newPhysics != null || oldPhysics != null);
Type controllerType = widget.controller == null ? null : widget.controller.GetType();
Type oldControllerType = oldWidget.controller == null ? null : oldWidget.controller.GetType();
return(controllerType != oldControllerType);
}
public static ListView seperated(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
IndexedWidgetBuilder itemBuilder = null,
IndexedWidgetBuilder separatorBuilder = null,
int itemCount = 0,
bool addAutomaticKeepAlives = true,
bool addRepaintBoundaries = true,
float?cacheExtent = null
)
{
return(new ListView(
key,
scrollDirection,
reverse,
controller,
primary,
physics,
shrinkWrap,
padding,
itemBuilder,
separatorBuilder,
itemCount,
addAutomaticKeepAlives,
addRepaintBoundaries,
cacheExtent
));
}
public ListView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
float?itemExtent = null,
bool addAutomaticKeepAlives = true,
bool addRepaintBoundaries = true,
float?cacheExtent = null,
List <Widget> children = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
cacheExtent: cacheExtent,
dragStartBehavior: dragStartBehavior
)
{
this.itemExtent = itemExtent;
this.childrenDelegate = new SliverChildListDelegate(
children,
addAutomaticKeepAlives: addAutomaticKeepAlives,
addRepaintBoundaries: addRepaintBoundaries
);
}
public BoxScrollView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
float?cacheExtent = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
cacheExtent: cacheExtent,
dragStartBehavior: dragStartBehavior
)
{
this.padding = padding;
}
public CustomScrollView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
Key center = null,
float anchor = 0.0f,
float?cacheExtent = null,
List <Widget> slivers = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
center: center,
anchor: anchor,
cacheExtent: cacheExtent,
dragStartBehavior: dragStartBehavior
)
{
this.slivers = slivers ?? new List <Widget>();
}
ListView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
float?itemExtent = null,
SliverChildDelegate childrenDelegate = null,
float?cacheExtent = null
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
cacheExtent: cacheExtent
)
{
D.assert(childrenDelegate != null);
this.itemExtent = itemExtent;
this.childrenDelegate = childrenDelegate;
}
public GridView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
SliverGridDelegate gridDelegate = null,
SliverChildDelegate childrenDelegate = null,
float?cacheExtent = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
cacheExtent: cacheExtent,
dragStartBehavior: dragStartBehavior
)
{
D.assert(gridDelegate != null);
D.assert(childrenDelegate != null);
this.gridDelegate = gridDelegate;
this.childrenDelegate = childrenDelegate;
}
protected ScrollView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
float?cacheExtent = null
) : base(key: key)
{
D.assert(!(controller != null && primary == true),
"Primary ScrollViews obtain their ScrollController via inheritance from a PrimaryScrollController widget. " +
"You cannot both set primary to true and pass an explicit controller.");
primary = primary ?? controller == null && scrollDirection == Axis.vertical;
physics = physics ?? (primary.Value ? new AlwaysScrollableScrollPhysics() : null);
this.scrollDirection = scrollDirection;
this.reverse = reverse;
this.controller = controller;
this.primary = primary.Value;
this.physics = physics;
this.shrinkWrap = shrinkWrap;
this.cacheExtent = cacheExtent;
}
public static PageView custom(
Key key = null,
Axis scrollDirection = Axis.horizontal,
bool reverse = false,
PageController controller = null,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
SliverChildDelegate childrenDelegate = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
bool allowImplicitScrolling = false
)
{
D.assert(childrenDelegate != null);
var page = new PageView(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller ?? PageViewUtils._defaultPageController,
physics: physics,
pageSnapping: pageSnapping,
onPageChanged: onPageChanged,
allowImplicitScrolling: allowImplicitScrolling,
dragStartBehavior: dragStartBehavior
);
page.childrenDelegate = childrenDelegate;
return(page);
}
public override ScrollPhysics applyTo(ScrollPhysics ancestor)
{
return(new _ForceImplicitScrollPhysics(
allowImplicitScrolling: allowImplicitScrolling,
parent: buildParent(ancestor)
));
}
public static PageView builder(
Key key = null,
Axis scrollDirection = Axis.horizontal,
bool reverse = false,
PageController controller = null,
ScrollPhysics physics = null,
bool pageSnapping = true,
ValueChanged <int> onPageChanged = null,
IndexedWidgetBuilder itemBuilder = null,
int itemCount = 0,
DragStartBehavior dragStartBehavior = DragStartBehavior.start,
bool allowImplicitScrolling = false
)
{
var page = new PageView(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller ?? PageViewUtils._defaultPageController,
physics: physics,
pageSnapping: pageSnapping,
onPageChanged: onPageChanged,
allowImplicitScrolling: allowImplicitScrolling,
dragStartBehavior: dragStartBehavior
);
page.childrenDelegate = new SliverChildBuilderDelegate(itemBuilder, childCount: itemCount);
return(page);
}
public static ListWheelScrollView useDelegate(
float itemExtent,
List <Widget> children = null,
ListWheelChildDelegate childDelegate = null,
Key key = null,
ScrollController controller = null,
ScrollPhysics physics = null,
float diameterRatio = RenderListWheelViewport.defaultDiameterRatio,
float perspective = RenderListWheelViewport.defaultPerspective,
float offAxisFraction = 0.0f,
bool useMagnifier = false,
float magnification = 1.0f,
ValueChanged <int> onSelectedItemChanged = null,
bool clipToSize = true,
bool renderChildrenOutsideViewport = false
)
{
return(new ListWheelScrollView(
itemExtent: itemExtent,
children: children,
childDelegate: childDelegate,
key: key,
controller: controller,
physics: physics,
diameterRatio: diameterRatio,
perspective: perspective,
offAxisFraction: offAxisFraction,
useMagnifier: useMagnifier,
magnification: magnification,
onSelectedItemChanged: onSelectedItemChanged,
clipToSize: clipToSize,
renderChildrenOutsideViewport: renderChildrenOutsideViewport
));
}
public _ForceImplicitScrollPhysics(
bool allowImplicitScrolling = false,
ScrollPhysics parent = null
) : base(parent: parent)
{
this.allowImplicitScrolling = allowImplicitScrolling;
}
public static GridView custom(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
SliverGridDelegate gridDelegate = null,
SliverChildDelegate childrenDelegate = null,
float?cacheExtent = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
)
{
return(new GridView(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
gridDelegate: gridDelegate,
childrenDelegate: childrenDelegate,
cacheExtent: cacheExtent,
dragStartBehavior: dragStartBehavior
));
}
protected ScrollView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
Key center = null,
float anchor = 0.0f,
float?cacheExtent = null,
DragStartBehavior dragStartBehavior = DragStartBehavior.start
) : base(key: key)
{
D.assert(!(controller != null && primary == true),
() => "Primary ScrollViews obtain their ScrollController via inheritance from a PrimaryScrollController widget. " +
"You cannot both set primary to true and pass an explicit controller.");
D.assert(!shrinkWrap || center == null);
D.assert(anchor >= 0.0f && anchor <= 1.0f);
primary = primary ?? controller == null && scrollDirection == Axis.vertical;
physics = physics ?? (primary.Value ? new AlwaysScrollableScrollPhysics() : null);
this.scrollDirection = scrollDirection;
this.reverse = reverse;
this.controller = controller;
this.primary = primary.Value;
this.physics = physics;
this.shrinkWrap = shrinkWrap;
this.center = center;
this.anchor = anchor;
this.cacheExtent = cacheExtent;
this.dragStartBehavior = dragStartBehavior;
}
public static GridView builder(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
SliverGridDelegate gridDelegate = null,
IndexedWidgetBuilder itemBuilder = null,
int?itemCount = null,
bool addAutomaticKeepAlives = true,
bool addRepaintBoundaries = true,
float?cacheExtent = null
)
{
return(new GridView(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
gridDelegate: gridDelegate,
itemBuilder: itemBuilder,
itemCount: itemCount,
addAutomaticKeepAlives: addAutomaticKeepAlives,
addRepaintBoundaries: addRepaintBoundaries,
cacheExtent: cacheExtent
));
}
public GridView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
SliverGridDelegate gridDelegate = null,
IndexedWidgetBuilder itemBuilder = null,
int?itemCount = null,
bool addAutomaticKeepAlives = true,
bool addRepaintBoundaries = true,
float?cacheExtent = null
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
cacheExtent: cacheExtent
)
{
this.gridDelegate = gridDelegate;
this.childrenDelegate = new SliverChildBuilderDelegate(
itemBuilder,
childCount: itemCount,
addAutomaticKeepAlives: addAutomaticKeepAlives,
addRepaintBoundaries: addRepaintBoundaries
);
}
public GridView(
Key key = null,
Axis scrollDirection = Axis.vertical,
bool reverse = false,
ScrollController controller = null,
bool?primary = null,
ScrollPhysics physics = null,
bool shrinkWrap = false,
EdgeInsets padding = null,
SliverGridDelegate gridDelegate = null,
bool addAutomaticKeepAlives = true,
bool addRepaintBoundaries = true,
float?cacheExtent = null,
List <Widget> children = null
) : base(
key: key,
scrollDirection: scrollDirection,
reverse: reverse,
controller: controller,
primary: primary,
physics: physics,
shrinkWrap: shrinkWrap,
padding: padding,
cacheExtent: cacheExtent
)
{
D.assert(gridDelegate != null);
this.childrenDelegate = new SliverChildListDelegate(
children ?? new List <Widget>(),
addAutomaticKeepAlives: addAutomaticKeepAlives,
addRepaintBoundaries: addRepaintBoundaries
);
}
protected ScrollPhysics buildParent(ScrollPhysics ancestor)
{
if (this.parent == null)
{
return(ancestor);
}
return(this.parent.applyTo(ancestor) ?? ancestor);
}
public override ScrollPosition createScrollPosition(ScrollPhysics physics, ScrollContext context,
ScrollPosition oldPosition)
{
return(new _FixedExtentScrollPosition(
physics: physics,
context: context,
initialItem: this.initialItem,
oldPosition: oldPosition
));
}
public override ScrollPosition createScrollPosition(ScrollPhysics physics, ScrollContext context,
ScrollPosition oldPosition)
{
return(new _PagePosition(
physics: physics,
context: context,
initialPage: this.initialPage,
keepPage: this.keepPage,
viewportFraction: this.viewportFraction,
oldPosition: oldPosition
));
}
public TestScrollPositionWithSingleContext(
ScrollPhysics physics = null,
ScrollContext context = null,
float?initialPixels = 0.0f,
bool keepScrollOffset = true,
ScrollPosition oldPosition = null,
string debugLabel = null
) : base(physics: physics,
context: context,
keepScrollOffset: keepScrollOffset,
oldPosition: oldPosition,
debugLabel: debugLabel)
{
}
public virtual ScrollPosition createScrollPosition(
ScrollPhysics physics,
ScrollContext context,
ScrollPosition oldPosition
)
{
return(new ScrollPositionWithSingleContext(
physics: physics,
context: context,
initialPixels: this.initialScrollOffset,
keepScrollOffset: this.keepScrollOffset,
oldPosition: oldPosition,
debugLabel: this.debugLabel
));
}
