RenderBoxContainerDefaultsMixin<ChildType extends RenderBox, ParentDataType extends ContainerBoxParentData<ChildType>> mixin

A mixin that provides useful default behaviors for boxes with children managed by the ContainerRenderObjectMixin mixin.

By convention, this class doesn't override any members of the superclass. Instead, it provides helpful functions that subclasses can call as appropriate.

Superclass Constraints
Implements
Implemented by

Constructors

RenderBoxContainerDefaultsMixin()

Properties

alwaysNeedsCompositing → bool
Whether this render object always needs compositing. [...]
@protected, read-only, inherited
attached → bool
Whether this node is in a tree whose root is attached to something. [...]
read-only, inherited
childCount → int
The number of children.
read-only, inherited
constraints → Constraints
The layout constraints most recently supplied by the parent.
@protected, read-only, inherited
debugCanParentUseSize → bool
Whether the parent render object is permitted to use this render object's size. [...]
read-only, inherited
debugCreator ↔ dynamic
The object responsible for creating this render object. [...]
read / write, inherited
debugDoingThisLayout → bool
Whether performLayout for this render object is currently running. [...]
read-only, inherited
debugDoingThisPaint → bool
Whether paint for this render object is currently running. [...]
read-only, inherited
debugDoingThisResize → bool
Whether performResize for this render object is currently running. [...]
read-only, inherited
debugLayer → OffsetLayer
In debug mode, the compositing layer that this render object uses to repaint. [...]
read-only, inherited
debugNeedsLayout → bool
Whether this render object's layout information is dirty. [...]
read-only, inherited
debugNeedsPaint → bool
Whether this render object's paint information is dirty. [...]
read-only, inherited
debugSemantics → SemanticsNode
The semantics of this render object. [...]
read-only, inherited
depth → int
The depth of this node in the tree. [...]
read-only, inherited
firstChild → ChildType
The first child in the child list.
read-only, inherited
hashCode → int
The hash code for this object. [...]
read-only, inherited
isRepaintBoundary → bool
Whether this render object repaints separately from its parent. [...]
read-only, inherited
lastChild → ChildType
The last child in the child list.
read-only, inherited
layer → OffsetLayer
The compositing layer that this render object uses to repaint. [...]
read-only, inherited
needsCompositing → bool
Whether we or one of our descendants has a compositing layer. [...]
read-only, inherited
owner → PipelineOwner
The owner for this node (null if unattached). [...]
read-only, inherited
paintBounds → Rect
An estimate of the bounds within which this render object will paint. Useful for debugging flags such as debugPaintLayerBordersEnabled. [...]
read-only, inherited
parent → AbstractNode
The parent of this node in the tree.
read-only, inherited
parentData ↔ ParentData
Data for use by the parent render object. [...]
read / write, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited
semanticBounds → Rect
The bounding box, in the local coordinate system, of this object, for accessibility purposes.
read-only, inherited
sizedByParent → bool
Whether the constraints are the only input to the sizing algorithm (in particular, child nodes have no impact). [...]
@protected, read-only, inherited

Methods

defaultComputeDistanceToFirstActualBaseline(TextBaseline baseline) → double
Returns the baseline of the first child with a baseline. [...]
defaultComputeDistanceToHighestActualBaseline(TextBaseline baseline) → double
Returns the minimum baseline value among every child. [...]
defaultHitTestChildren(HitTestResult result, { Offset position }) → bool
Performs a hit test on each child by walking the child list backwards. [...]
defaultPaint(PaintingContext context, Offset offset) → void
Paints each child by walking the child list forwards. [...]
getChildrenAsList() → List<ChildType>
Returns a list containing the children of this render object. [...]
add(ChildType child) → void
Append child to the end of this render object's child list.
inherited
addAll(List<ChildType> children) → void
Add all the children to the end of this render object's child list.
inherited
adoptChild(covariant RenderObject child) → void
Called by subclasses when they decide a render object is a child. [...]
inherited
applyPaintTransform(covariant RenderObject child, Matrix4 transform) → void
Applies the transform that would be applied when painting the given child to the given matrix. [...]
inherited
assembleSemanticsNode(SemanticsNode node, SemanticsConfiguration config, Iterable<SemanticsNode> children) → void
Assemble the SemanticsNode for this RenderObject. [...]
inherited
attach(covariant PipelineOwner owner) → void
Mark this node as attached to the given owner. [...]
inherited
childAfter(ChildType child) → ChildType
The next child after the given child in the child list.
inherited
childBefore(ChildType child) → ChildType
The previous child before the given child in the child list.
inherited
clearSemantics() → void
Removes all semantics from this render object and its descendants. [...]
@mustCallSuper, inherited
debugAssertDoesMeetConstraints() → void
Verify that the object's constraints are being met. Override this function in a subclass to verify that your state matches the constraints object. This function is only called in checked mode and only when needsLayout is false. If the constraints are not met, it should assert or throw an exception.
@protected, inherited
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. [...]
@protected, inherited
debugPaint(PaintingContext context, Offset offset) → void
Override this method to paint debugging information.
inherited
debugRegisterRepaintBoundaryPaint({bool includedParent: true, bool includedChild: false }) → void
Called, in checked mode, if isRepaintBoundary is true, when either the this render object or its parent attempt to paint. [...]
inherited
debugResetSize() → void
If a subclass has a "size" (the state controlled by parentUsesSize, whatever it is in the subclass, e.g. the actual size property of RenderBox), and the subclass verifies that in checked mode this "size" property isn't used when debugCanParentUseSize isn't set, then that subclass should override debugResetSize to reapply the current values of debugCanParentUseSize to that state.
@protected, inherited
debugValidateChild(RenderObject child) → bool
Checks whether the given render object has the correct runtimeType to be a child of this render object. [...]
inherited
describeApproximatePaintClip(covariant RenderObject child) → Rect
Returns a rect in this object's coordinate system that describes the approximate bounding box of the clip rect that would be applied to the given child during the paint phase, if any. [...]
inherited
describeSemanticsClip(covariant RenderObject child) → Rect
Returns a rect in this object's coordinate system that describes which SemanticsNodes produced by the child should be included in the semantics tree. SemanticsNodes from the child that are positioned outside of this rect will be dropped. Child SemanticsNodes that are positioned inside this rect, but outside of describeApproximatePaintClip will be included in the tree marked as hidden. Child SemanticsNodes that are inside of both rect will be included in the tree as regular nodes. [...]
inherited
describeSemanticsConfiguration(SemanticsConfiguration config) → void
Report the semantics of this node, for example for accessibility purposes. [...]
@protected, inherited
detach() → void
Mark this node as detached. [...]
inherited
dropChild(covariant RenderObject child) → void
Called by subclasses when they decide a render object is no longer a child. [...]
inherited
getTransformTo(RenderObject ancestor) → Matrix4
Applies the paint transform up the tree to ancestor. [...]
inherited
handleEvent(PointerEvent event, covariant HitTestEntry entry) → void
Override this method to handle pointer events that hit this render object.
inherited
insert(ChildType child, { ChildType after }) → void
Insert child into this render object's child list after the given child. [...]
inherited
invokeLayoutCallback<T extends Constraints>(LayoutCallback<T> callback) → void
Allows mutations to be made to this object's child list (and any descendants) as well as to any other dirty nodes in the render tree owned by the same PipelineOwner as this object. The callback argument is invoked synchronously, and the mutations are allowed only during that callback's execution. [...]
@protected, inherited
layout(Constraints constraints, { bool parentUsesSize: false }) → void
Compute the layout for this render object. [...]
inherited
markNeedsCompositingBitsUpdate() → void
Mark the compositing state for this render object as dirty. [...]
inherited
markNeedsLayout() → void
Mark this render object's layout information as dirty, and either register this object with its PipelineOwner, or defer to the parent, depending on whether this object is a relayout boundary or not respectively. [...]
inherited
markNeedsLayoutForSizedByParentChange() → void
Mark this render object's layout information as dirty (like markNeedsLayout), and additionally also handle any necessary work to handle the case where sizedByParent has changed value. [...]
inherited
markNeedsPaint() → void
Mark this render object as having changed its visual appearance. [...]
inherited
markNeedsSemanticsUpdate() → void
Mark this node as needing an update to its semantics description. [...]
inherited
markParentNeedsLayout() → void
Mark this render object's layout information as dirty, and then defer to the parent. [...]
@protected, inherited
move(ChildType child, { ChildType after }) → void
Move this child in the child list to be before the given child. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
paint(PaintingContext context, Offset offset) → void
Paint this render object into the given context at the given offset. [...]
inherited
performLayout() → void
Do the work of computing the layout for this render object. [...]
@protected, inherited
performResize() → void
Updates the render objects size using only the constraints. [...]
@protected, inherited
reassemble() → void
Cause the entire subtree rooted at the given RenderObject to be marked dirty for layout, paint, etc, so that the effects of a hot reload can be seen, or so that the effect of changing a global debug flag (such as debugPaintSizeEnabled) can be applied. [...]
inherited
redepthChild(AbstractNode child) → void
Adjust the depth of the given child to be greater than this node's own depth. [...]
@protected, inherited
redepthChildren() → void
Adjust the depth of this node's children, if any. [...]
inherited
remove(ChildType child) → void
Remove this child from the child list. [...]
inherited
removeAll() → void
Remove all their children from this render object's child list. [...]
inherited
replaceRootLayer(OffsetLayer rootLayer) → void
Replace the layer. This is only valid for the root of a render object subtree (whatever object scheduleInitialPaint was called on). [...]
inherited
rotate({int oldAngle, int newAngle, Duration time }) → void
Rotate this render object (not yet implemented).
inherited
scheduleInitialLayout() → void
Bootstrap the rendering pipeline by scheduling the very first layout. [...]
inherited
scheduleInitialPaint(ContainerLayer rootLayer) → void
Bootstrap the rendering pipeline by scheduling the very first paint. [...]
inherited
scheduleInitialSemantics() → void
Bootstrap the semantics reporting mechanism by marking this node as needing a semantics update. [...]
inherited
sendSemanticsEvent(SemanticsEvent semanticsEvent) → void
Sends a SemanticsEvent associated with this render object's SemanticsNode. [...]
inherited
setupParentData(covariant RenderObject child) → void
Override to setup parent data correctly for your children. [...]
inherited
showOnScreen({RenderObject descendant, Rect rect, Duration duration: Duration.zero, Curve curve: Curves.ease }) → void
Attempt to make (a portion of) this or a descendant RenderObject visible on screen. [...]
inherited
toDiagnosticsNode({String name, DiagnosticsTreeStyle style }) → DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel }) → String
Returns a string representation of this object.
inherited
toStringDeep({String prefixLineOne: '', String prefixOtherLines: '', DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String
Returns a description of the tree rooted at this node. If the prefix argument is provided, then every line in the output will be prefixed by that string.
inherited
toStringShallow({String joiner: '; ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String
Returns a one-line detailed description of the render object. This description is often somewhat long. [...]
inherited
toStringShort() → String
Returns a human understandable name.
inherited
visitChildren(RenderObjectVisitor visitor) → void
Calls visitor for each immediate child of this render object. [...]
inherited
visitChildrenForSemantics(RenderObjectVisitor visitor) → void
Called when collecting the semantics of this node. [...]
inherited

Operators

operator ==(dynamic other) → bool
The equality operator. [...]
inherited