Snackbar, Tooltip, Search, and Divider

Use xmlns:m3c="using:Material3.Avalonia.Controls".

Snackbar

Render a single snackbar directly when you manage its lifetime yourself:

<m3c:Snackbar Message="Photo saved to album"
              ActionText="UNDO"
              ActionClicked="OnUndo" />

Member	Type	Default	Description
Message	string?	null	Snackbar message.
ActionText	string?	null	Optional action label; null or empty hides it.
ActionClicked	event EventHandler	-	Raised when the action is clicked.

Snackbar does not dismiss itself or start a timer.

SnackbarHost

Wrap the UI region over which transient snackbars should appear. Calls made before the host is attached are queued and displayed after its template is applied.

<m3c:SnackbarHost x:Name="SnackbarHost">
    <Grid>
        <!-- Page UI -->
    </Grid>
</m3c:SnackbarHost>

SnackbarHost.Show(
    message: "Saved",
    actionText: "UNDO",
    duration: TimeSpan.FromSeconds(4),
    onAction: UndoSave);

public void Show(
    string message,
    string? actionText = null,
    TimeSpan? duration = null,
    Action? onAction = null)

The default duration is four seconds. A new call replaces the current snackbar; clicking its action invokes the callback and dismisses it. The host has no public Dismiss method. Its own bounds define the overlay region, so stretch it to cover the intended content.

RichTooltip

RichTooltip supplies structured tooltip content; Avalonia's ToolTip infrastructure still controls opening and placement.

<Button Content="Help">
    <ToolTip.Tip>
        <m3c:RichTooltip Subhead="Keyboard shortcuts">
            <TextBlock Text="Press Ctrl+K to open search."
                       TextWrapping="Wrap" />
            <m3c:RichTooltip.Actions>
                <Button Classes="text" Content="Learn more" />
            </m3c:RichTooltip.Actions>
        </m3c:RichTooltip>
    </ToolTip.Tip>
</Button>

Subhead and Actions both default to null; direct content is the tooltip body.

SearchBar

<m3c:SearchBar Text="{Binding Query}"
               Watermark="Search components"
               QuerySubmitted="OnQuerySubmitted" />

private void OnQuerySubmitted(object? sender, string query)
{
    Search(query);
}

Member	Type	Default	Description
Text	string?	null	Query text; two-way by default.
Watermark	string?	"Search"	Placeholder text.
LeadingIcon	object?	null	Replaces the built-in search icon.
TrailingContent	object?	null	Optional avatar, microphone, clear button, or other content.
QuerySubmitted	event EventHandler<string>	-	Raised with the current text when Enter is pressed.

Divider

<m3c:Divider Margin="0,8" />

<Grid ColumnDefinitions="*,Auto,*" Height="48">
    <TextBlock Grid.Column="0" Text="Left" />
    <m3c:Divider Grid.Column="1"
                   Orientation="Vertical"
                   Margin="12,0" />
    <TextBlock Grid.Column="2" Text="Right" />
</Grid>

Orientation defaults to Horizontal. A vertical divider needs a parent that gives it a usable height.