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ListViewView source
1 min readA recycling list that only builds the rows you can see. Ten thousand rows cost what a screenful costs.
1
using eQuantic.UI.Components;
WINDOWING
Row 1
Row 2
Row 3
Row 4
Row 5
Row 6
Row 7
Row 8
Row 9
Row 10
Row 11
Row 12
Row 13
Row 14
Row 15
Row 16
Usage
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new ListView(count: 10_000, itemExtent: 44, itemBuilder: i => RowFor(i))
{
Width = SizeValue.Fill,
Height = SizeValue.Fill, // the list is a WINDOW — give it one
Overscan = 3,
}
API
Prop
Type
Default
Description
count
int
—
Logical row count (constructor).
itemExtent
float
—
Fixed row height (constructor). Variable extents are outside v1.
itemBuilder
Func<int, VisualNode>
—
Called only for rows in the window plus overscan.
Overscan
int
3
Rows built beyond each edge to absorb a fling.
Width
SizeValue
Auto
Usually Fill.
Height
SizeValue
Auto
Must be given — a window without a height is not a window.
States
State
Rendering
First frame
Builds against a viewport guess
Converged
The realized frame reports the true viewport; the next frame corrects
Scrolling
Pixels move without a rebuild until a row crosses the overscan margin
Accessibility
•
The scroll region reports the total count, so readers announce "row 40 of 10,000" rather than the window size.
When to use
•
Any collection past a few hundred rows.
Avoid
•
Nesting one inside an auto-height parent.
WARNINGScope (v1): vertical lists with a fixed ItemExtent.
NOTEEvery dimension resolves through Sizing.*(SizeVariant) and the token scales — never a literal. Source: src/eQuantic.UI.Components/ListView.cs.