RenderSliverBoxChildManager class abstract
A delegate used by RenderSliverMultiBoxAdaptor to manage its children.
RenderSliverMultiBoxAdaptor objects reify their children lazily to avoid spending resources on children that are not visible in the viewport. This delegate lets these objects create and remove children as well as estimate the total scroll offset extent occupied by the full child list.
- Implementers
Constructors
Properties
- childCount → int
-
Called to obtain a precise measure of the total number of children.
no setter
- estimatedChildCount → int?
-
The best available estimate of childCount, or null if no estimate is available.
no setter
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
createChild(
int index, {required RenderBox? after}) → void -
Called during layout when a new child is needed. The child should be
inserted into the child list in the appropriate position, after the
afterchild (at the start of the list ifafteris null). Its index and scroll offsets will automatically be set appropriately. -
debugAssertChildListLocked(
) → bool - In debug mode, asserts that this manager is not expecting any modifications to the RenderSliverMultiBoxAdaptor's child list.
-
didAdoptChild(
RenderBox child) → void - Called during RenderSliverMultiBoxAdaptor.adoptChild or RenderSliverMultiBoxAdaptor.move.
-
didFinishLayout(
) → void - Called at the end of layout to indicate that layout is now complete.
-
didStartLayout(
) → void - Called at the beginning of layout to indicate that layout is about to occur.
-
estimateMaxScrollOffset(
SliverConstraints constraints, {int? firstIndex, int? lastIndex, double? leadingScrollOffset, double? trailingScrollOffset}) → double - Called to estimate the total scrollable extents of this object.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
removeChild(
RenderBox child) → void - Remove the given child from the child list.
-
setDidUnderflow(
bool value) → void - Called during layout to indicate whether this object provided insufficient children for the RenderSliverMultiBoxAdaptor to fill the SliverConstraints.remainingPaintExtent.
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited