---
description: >-
  A feature that provides notifications when specific animation sequences, such
  as particle or hover animations, complete, allowing developers to hook into
  these moments for further processing, etc.
---

# Events and Callbacks

## Overview

The Events feature in the SiticoneNavBackButton control exposes notifications for key moments during the control’s animated interactions. In particular, the control fires the `ParticleAnimationCompleted` event when the particle effect concludes, and the `HoverAnimationCompleted` event when the hover animation reaches its end. These events enable developers to execute additional logic—such as logging, state updates, or further UI changes—after animations have completed, thus allowing for more interactive and responsive application designs.

***

### Properties Table

| Event Name                 | Description                                                                                         | Category           |
| -------------------------- | --------------------------------------------------------------------------------------------------- | ------------------ |
| ParticleAnimationCompleted | Fires when the particle animation sequence has finished executing after a click event.              | Back Button Events |
| HoverAnimationCompleted    | Fires when the hover animation reaches full completion, indicating the end of the hover transition. | Back Button Events |

***

### Key Points

| Point                           | Details                                                                                                                       |
| ------------------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| Synchronization with animations | These events allow your application logic to synchronize with the control’s internal animation cycles.                        |
| Enhanced interactivity          | Developers can utilize these events to trigger subsequent UI updates or logic flows once an animation completes.              |
| Simplified integration          | The event hooks are straightforward to subscribe to, providing an easy integration point for extending control functionality. |

***

### Best Practices

| Best Practice                                   | Explanation                                                                                                                           |
| ----------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- |
| Subscribe early to event notifications          | Hook into these events during the form initialization to ensure that your logic is ready to respond as soon as animations complete.   |
| Unsubscribe from events when no longer needed   | Remove event handlers when the control is disposed or when they are no longer necessary to avoid memory leaks or unintended behavior. |
| Use events to chain animations or logic         | Leverage these events to trigger sequential animations or processing steps, enhancing the user experience without blocking the UI.    |
| Validate animation completion before proceeding | Ensure that dependent logic waits for the animation to complete, especially in scenarios where timing is crucial.                     |

***

### Common Pitfalls

| Pitfall                         | Explanation and Mitigation                                                                                                                    |
| ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
| Missing event subscriptions     | Forgetting to subscribe to events may result in lost opportunities for synchronized actions; always check event wiring during initialization. |
| Overcomplicating event handlers | Ensure that event handlers remain lightweight; heavy processing inside these events can block the UI thread and degrade performance.          |
| Not unsubscribing from events   | Failing to detach event handlers can cause memory leaks or unexpected behavior, particularly in dynamic or long-running applications.         |
| Confusing event order           | Rely on documented event order (hover animation completes before its corresponding logic executes) to prevent timing issues.                  |

***

### Usage Scenarios

| Scenario                              | Description                                                                                               | Example Scenario                                                                                                       |
| ------------------------------------- | --------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------- |
| Triggering follow-up animations       | After a particle animation completes, start another animation sequence or update the UI.                  | When a button click completes its particle effect, automatically start a fade-out effect on a related UI element.      |
| Logging user interaction events       | Use event notifications to log when users interact with the control, facilitating user behavior analysis. | Log a message or record the timestamp each time the hover animation finishes, indicating user engagement levels.       |
| Chaining actions in complex workflows | Chain multiple animations or UI changes to create fluid, non-blocking interactions.                       | Upon the completion of the hover animation, enable a subsequent control or update a status indicator in the interface. |

***

### Code Examples

#### Example 1: Subscribing to Animation Completion Events

This example demonstrates how to subscribe to the `ParticleAnimationCompleted` and `HoverAnimationCompleted` events and execute custom logic when these animations finish.

```csharp
// Initialize the SiticoneNavBackButton control
SiticoneNavBackButton navBackButton = new SiticoneNavBackButton();

// Subscribe to the ParticleAnimationCompleted event
navBackButton.ParticleAnimationCompleted += (sender, e) =>
{
    // Custom logic after particle animation completes
    Console.WriteLine("Particle animation completed!");
    // For example, trigger another UI update or start a subsequent animation
};

// Subscribe to the HoverAnimationCompleted event
navBackButton.HoverAnimationCompleted += (sender, e) =>
{
    // Custom logic after hover animation completes
    Console.WriteLine("Hover animation completed!");
    // Possibly update a related control's state or log user engagement
};

// Add the control to the form
this.Controls.Add(navBackButton);
```

#### Example 2: Unsubscribing from Events

This example shows how to unsubscribe from the events, which is particularly useful when disposing of controls or changing the application state.

```csharp
// Define event handlers
EventHandler particleHandler = (sender, e) =>
{
    Console.WriteLine("Particle animation completed!");
};

EventHandler hoverHandler = (sender, e) =>
{
    Console.WriteLine("Hover animation completed!");
};

// Subscribe to events
navBackButton.ParticleAnimationCompleted += particleHandler;
navBackButton.HoverAnimationCompleted += hoverHandler;

// At a later point, for example during form closing or control disposal:
navBackButton.ParticleAnimationCompleted -= particleHandler;
navBackButton.HoverAnimationCompleted -= hoverHandler;
```

#### Example 3: Chaining Actions Based on Animation Completion

This example demonstrates how to use the events to trigger a secondary action once the primary animation completes.

```csharp
// Subscribe to ParticleAnimationCompleted to trigger a follow-up action
navBackButton.ParticleAnimationCompleted += (sender, e) =>
{
    // Trigger a follow-up animation or update another part of the UI
    StartSecondaryAnimation();
};

private void StartSecondaryAnimation()
{
    // Example method to perform an additional UI update or animation
    Console.WriteLine("Starting secondary animation.");
    // Insert additional animation or processing logic here
}
```

***

### Review

| Review Point                       | Comments                                                                                                                     |
| ---------------------------------- | ---------------------------------------------------------------------------------------------------------------------------- |
| Ease of event integration          | The event model is straightforward, allowing developers to easily subscribe and unsubscribe from key animation events.       |
| Synchronization with UI actions    | Events provide an effective mechanism to synchronize further processing with animation completions, enhancing interactivity. |
| Flexibility for advanced workflows | The ability to chain actions or trigger additional logic based on animation events can greatly enhance the user experience.  |

***

### Summary

The Events feature in the SiticoneNavBackButton control offers developers the ability to hook into key animation completion moments. By subscribing to the `ParticleAnimationCompleted` and `HoverAnimationCompleted` events, you can synchronize additional UI actions or logic with the end of specific animation sequences. This level of integration ensures that your application remains responsive and visually engaging, providing a seamless user experience.

***

### Additional Sections

#### Troubleshooting

| Issue                               | Possible Cause                                                                      | Recommended Solution                                                                                        |
| ----------------------------------- | ----------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------- |
| Event handler not firing            | The control may not be triggering the animation or the subscription may have failed | Ensure that the control’s animation properties are enabled and that event handlers are properly subscribed. |
| Memory leaks or unexpected behavior | Failure to unsubscribe from events when they are no longer needed                   | Always unsubscribe event handlers during control disposal or when the event is no longer necessary.         |
| Delayed event responses             | Heavy processing in the event handler may delay the UI updates                      | Keep event handlers lightweight and offload heavy processing to background tasks if needed.                 |

#### Integration Checklist

| Task                                                 | Status | Notes                                                                                        |
| ---------------------------------------------------- | ------ | -------------------------------------------------------------------------------------------- |
| Subscribe to ParticleAnimationCompleted event        | \[ ]   | Ensure that the logic inside the event handler executes as expected when the animation ends. |
| Subscribe to HoverAnimationCompleted event           | \[ ]   | Confirm that the hover animation completion is properly detected and triggers the handler.   |
| Unsubscribe from events appropriately                | \[ ]   | Implement unsubscription logic in control disposal to prevent memory leaks.                  |
| Test event handling under various animation settings | \[ ]   | Validate event responses with different animation speeds and particle configurations.        |

#### Best Practices Recap

* Subscribe to animation events early in the control's lifecycle to ensure responsiveness.
* Keep event handlers concise to maintain UI performance.
* Unsubscribe from events when they are no longer necessary to avoid memory issues.
* Use event chaining to create fluid, sequential animations and user interactions.

***

This comprehensive documentation for the Events feature of the SiticoneNavBackButton control provides all the necessary details, best practices, usage scenarios, and code examples to help developers effectively integrate and manage animation completion events in their .NET WinForms applications.





