Notification System

OSSIM provides a global notification system for displaying toast alerts with severity levels, auto-dismiss timers, and frosted glass styling.

Pushing Notifications

From App Controllers

Every UAppBase has built-in notification helpers:

// From any UAppBase-derived controller:
NotifyInfo(TEXT("File saved successfully"));
NotifySuccess(TEXT("Operation completed"));
NotifyWarning(TEXT("Disk space low"));
NotifyError(TEXT("Failed to save file"));

From Any Code

Use UNotificationSubsystem directly:

UNotificationSubsystem* NS = GameInstance->GetSubsystem<UNotificationSubsystem>();
NS->NotifyInfo(FText::FromString("Hello!"));

Or via the Blueprint Function Library:

UOSSIMNotificationLibrary::NotifyInfo(WorldContext, FText::FromString("Hello!"));

Severity Levels & Durations

Sticky notifications (bSticky=true) do not auto-dismiss.

Configuration

• Max Active Notifications: 6 (oldest evicted when cap exceeded).
• Fallback Duration: 4.0s.
• Host Z-Order: 12000 (above all windows).

Architecture

Notification Data (FOSSIMNotificationData)

• Id: FGuid — Unique notification identifier.
• Title, Message, Source: FText — Display content.
• Severity: EOSSIMNotificationSeverity — Info/Success/Warning/Error.
• Icon: UTexture2D* — Optional icon.
• DurationSeconds: float — Auto-dismiss duration.
• bSticky: bool — Prevent auto-dismiss.
• CreatedAt: FDateTime — Creation timestamp.

Rendering Pipeline

PushNotification → ActiveNotifications.Insert(0) → ScheduleAutoDismiss
  → OnNotificationsChanged → UOSSIMNotificationCenter::RebuildNotifications
    → UOSSIMNotificationToast (per notification) → Slate SNotificationToast

Slate Toast (SNotificationToast)

• 340px wide frosted glass design using SBackgroundBlur + FSlateRoundedBoxBrush.
• Severity-based accent color strip.
• 0.25s fade/scale entry animation.
• Close button for manual dismissal.

Delegates

• OnNotificationAdded(FOSSIMNotificationData) — Fired when a new notification is pushed.
• OnNotificationRemoved(FOSSIMNotificationData) — Fired on dismiss.
• OnNotificationsChanged() — Fired on any change to the active list.