TreeViewport class
A widget through which a portion of a tree of TreeViewNode children are viewed as rows, typically in combination with a TreeView.
- Inheritance
Constructors
-
TreeViewport({Key? key, required ViewportOffset verticalOffset, required AxisDirection verticalAxisDirection, required ViewportOffset horizontalOffset, required AxisDirection horizontalAxisDirection, required TreeRowDelegateMixin delegate, double? cacheExtent, Clip clipBehavior = Clip.hardEdge, required Map<
UniqueKey, TreeViewNodesAnimation> activeAnimations, required Map<int, int> rowDepths, required double indentation}) -
Creates a viewport for Widgets that extend and scroll in both
horizontal and vertical dimensions.
const
Properties
-
activeAnimations
→ Map<
UniqueKey, TreeViewNodesAnimation> -
The currently active TreeViewNode animations.
final
- cacheExtent → double?
-
The viewport has an area before and after the visible area to cache items
that are about to become visible when the user scrolls.
finalinherited
- clipBehavior → Clip
-
The content will be clipped (or not) according to this option.
finalinherited
- delegate → TwoDimensionalChildDelegate
-
A delegate that provides the children for the TwoDimensionalViewport.
finalinherited
- hashCode → int
-
The hash code for this object.
no setterinherited
- horizontalAxisDirection → AxisDirection
-
The direction in which the horizontalOffset's ViewportOffset.pixels
increases.
finalinherited
- horizontalOffset → ViewportOffset
-
Which part of the content inside the viewport should be visible in the
horizontal axis.
finalinherited
- indentation → double
-
The number of pixels by which child nodes will be offset in the cross axis
based on their TreeViewNode.depth.
final
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- mainAxis → Axis
-
The main axis of the two.
finalinherited
-
rowDepths
→ Map<
int, int> -
The depth of each active
TreeNode.final - runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- verticalAxisDirection → AxisDirection
-
The direction in which the verticalOffset's ViewportOffset.pixels
increases.
finalinherited
- verticalOffset → ViewportOffset
-
Which part of the content inside the viewport should be visible in the
vertical axis.
finalinherited
Methods
-
createElement(
) → RenderObjectElement -
RenderObjectWidgets always inflate to a RenderObjectElement subclass.
inherited
-
createRenderObject(
BuildContext context) → RenderTreeViewport -
Creates an instance of the RenderObject class that this
RenderObjectWidget represents, using the configuration described by this
RenderObjectWidget.
override
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of DiagnosticsNode objects describing this node's
children.
inherited
-
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
didUnmountRenderObject(
covariant RenderObject renderObject) → void -
This method is called when a RenderObject that was previously
associated with this widget is removed from the render tree.
The provided RenderObject will be of the same type as the one created by
this widget's createRenderObject method.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
-
updateRenderObject(
BuildContext context, covariant RenderTreeViewport renderObject) → void -
Copies the configuration described by this RenderObjectWidget to the
given RenderObject, which will be of the same type as returned by this
object's createRenderObject.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited