CommandBar

Family: Navigation & Workflow
Namespace: Tessera.Controls

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

When to use

• You need a CommandBar-style interaction inside the navigation & workflow 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 CommandBar
{
    Title = "CommandBar"
};

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

Common pitfalls

• Do not choose CommandBar by name only; validate it against the target workflow.
• Keep this control scoped to the navigation & workflow 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
DisabledItemStyle	TesseraStyle
FocusedTitleStyle	TesseraStyle
FocusMarker	string
HoveredItemStyle	TesseraStyle
IsDisabled	bool
IsFocused	bool
IsReadOnly	bool
ItemSeparator	string
ItemStyle	TesseraStyle
LastActivatedItemId	string?
SelectedItemStyle	TesseraStyle
SelectedPrefix	string
SelectedSuffix	string
SeparatorStyle	TesseraStyle
ShowFocusMarker	bool
Title	string
TitleStyle	TesseraStyle

Public events

Event	Type
ItemActivated	EventHandler<CommandBarItemActivatedEventArgs>?

Related docs

• Widget Reference
• Widgets Overview
• Public API Inventory