TreeMapChart

Family: Dashboards & Plots
Namespace: Tessera.Controls

Use TreeMapChart when this interaction is the best match for your screen workflow.

When to use

• You need a TreeMapChart-style interaction inside the dashboards & plots lane.
• A titled widget surface improves scanability in dense shells.
• You want explicit user-driven events routed into app state updates.

Minimal usage

csharp.cs

using Tessera.Controls;
using Tessera.Layout;

var widget = new TreeMapChart
{
    Title = "TreeMapChart"
};

return Screen.Build(window => window.Body(body => body.Center(widget, width: 44, height: 9)));

Common pitfalls

• Do not choose TreeMapChart by name only; validate it against the target workflow.
• Keep this control scoped to the dashboards & plots concern; avoid cross-layer state coupling.
• Handle control events by posting/processing messages; avoid hidden mutation in render paths.
• Set focused/normal styles intentionally so keyboard focus remains obvious.
• Keep disabled state explicit and reversible so users understand why actions are blocked.

Public properties

Property	Type
Border	BorderStyle
BorderStyleText	TesseraStyle
DisabledNodeStyle	TesseraStyle
EmptyStyle	TesseraStyle
EmptyText	string
FocusedBorderStyleText	TesseraStyle
FocusedSelectedNodeStyle	TesseraStyle
FocusedTitleStyle	TesseraStyle
FocusMarker	string
HighGlyph	char
HighNodeStyle	TesseraStyle
HoveredNodeStyle	TesseraStyle
IsDisabled	bool
IsFocused	bool
IsReadOnly	bool
LabelStyle	TesseraStyle
LowGlyph	char
LowNodeStyle	TesseraStyle
MidGlyph	char
MidNodeStyle	TesseraStyle
NodeStyle	TesseraStyle
Padding	Thickness
PeakGlyph	char
PeakNodeStyle	TesseraStyle
SelectedIndex	int
SelectedNodeStyle	TesseraStyle
ShowFocusMarker	bool
ShowLabels	bool
ShowLegend	bool
Title	string
TitleStyle	TesseraStyle

Public events

Event	Type
SelectionChanged	EventHandler<ListSelectionChangedEventArgs<TreeMapNode?>>?

Related docs

• Widget Reference
• Widgets Overview
• Public API Inventory