GridPinnedQuadrant<T extends DataGridRow> class
Renders the pinned (frozen) columns quadrant of the custom layout grid.
Only listens to vOffset; horizontal scrolling never affects this quadrant.
Widget rebuilds are restricted to frames where the visible row range
changes (a row enters or leaves the viewport). Repositioning within the
same row range is handled entirely by GridLayoutDelegate.relayout.
Carry-over cells are served from _cellCache (identical widget instances)
so Flutter skips their build call even during set-change rebuilds.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- GridPinnedQuadrant
Constructors
-
GridPinnedQuadrant({Key? key, required List<
DataGridColumn< columns, required List<T> >int> pinnedIndices, required double viewportHeight, required List<double> displayOrder, required Map<double, T> rowsById, required int rowCount, required double rowHeight, required double cacheExtent, required Color backgroundColor, required ValueNotifier<double> vOffset}) -
const
Properties
- backgroundColor → Color
-
final
- cacheExtent → double
-
final
-
columns
→ List<
DataGridColumn< T> > -
final
-
displayOrder
→ List<
double> -
final
- hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
-
pinnedIndices
→ List<
int> -
final
- rowCount → int
-
final
- rowHeight → double
-
final
-
rowsById
→ Map<
double, T> -
final
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- viewportHeight → double
-
final
-
vOffset
→ ValueNotifier<
double> -
final
Methods
-
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< GridPinnedQuadrant< T> > -
Creates the mutable state for this widget at a given location in the tree.
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
-
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
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited