A widget that's bigger on the inside.
The child of a viewport can layout to a larger size along the viewport's mainAxis than the viewport itself. If that happens, only a portion of the child will be visible through the viewport. The portion of the child that is visible is controlled by the scroll offset.
Viewport is the core scrolling primitive in the system, but it can be used in other situations.
- Inheritance
Constructors
- Viewport({Key key, Offset paintOffset: Offset.zero, Axis mainAxis: Axis.vertical, ViewportAnchor anchor: ViewportAnchor.start, ViewportDimensionsChangeCallback onPaintOffsetUpdateNeeded, Widget child })
-
Creates a widget that's bigger on the inside.
Properties
- anchor → ViewportAnchor
-
The end of the viewport from which the paint offset is computed.
read-only - mainAxis → Axis
-
The direction in which the child is permitted to be larger than the viewport.
read-only - onPaintOffsetUpdateNeeded → ViewportDimensionsChangeCallback
-
Called when the interior or exterior dimensions of the viewport change.
read-only - paintOffset → Offset
-
The offset at which to paint the child.
read-only - child → Widget
-
The widget below this widget in the tree.
read-only, inherited - hashCode → int
-
Get a hash code for this object.
read-only, inherited - key → Key
-
Controls how one widget replaces another widget in the tree.
read-only, inherited - runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Operators
-
operator ==(
other) → bool -
The equality operator.
inherited
Methods
-
createRenderObject(
BuildContext context) → RenderViewport -
Creates an instance of the
RenderObjectclass that thisRenderObjectWidgetrepresents, using the configuration described by thisRenderObjectWidget. -
updateRenderObject(
BuildContext context, RenderViewport renderObject) → void -
Copies the configuration described by this
RenderObjectWidgetto the givenRenderObject, which will be of the same type as returned by this object'screateRenderObject. -
createElement(
) → SingleChildRenderObjectElement -
RenderObjectWidgets always inflate to a
RenderObjectElementsubclass.inherited -
debugFillDescription(
List<String> description) → void -
Add additional information to the given description for use by toString.
inherited -
didUnmountRenderObject(
RenderObject renderObject) → void -
A render object previously associated with this widget has been removed from the tree. The given RenderObject will be of the same type as returned by this object's createRenderObject.
inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed.
inherited -
toString(
) → String -
Returns a string representation of this object.
inherited -
toStringShort(
) → String -
A short, textual description of this widget.
inherited