Events and Callbacks

Events & Callbacks provide a mechanism to respond to progress changes and animation state transitions, enabling developers to integrate custom logic in response to the control's internal state changes

Overview

The Events and Callbacks feature in the SiticoneHBarsProgress component enables developers to monitor and respond to key actions within the control. These include progress updates via the ProgressChanged event, completion notifications with the AnimationCompleted event, and real-time animation state updates through the AnimationStateChanged event. This documentation outlines each event, explains their associated callback data, and provides best practices, common pitfalls, and usage scenarios to help integrate responsive behavior into .NET WinForms applications.

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API Reference

Feature Element	Type	Default Value	Description
ProgressChanged	Event	N/A	Occurs when the progress value changes; provides both the previous and new values via a custom event argument (ProgressChangedEventArgs).
AnimationCompleted	Event	N/A	Fires when an ongoing animation has reached its target value and completes.
AnimationStateChanged	Event	N/A	Raised when the animation state changes (i.e., when an animation starts or stops), passing an AnimationStateChangedEventArgs object with the current state.

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Code Examples

Example 1: Handling Progress Changes

This example demonstrates how to subscribe to the ProgressChanged event to execute custom logic whenever the progress value is updated.

// Instantiate the progress bar control.
var progressBar = new SiticoneHBarsProgress();

// Subscribe to the ProgressChanged event.
progressBar.ProgressChanged += (sender, e) =>
{
    // Log the old and new progress values.
    Console.WriteLine($"Progress updated from {e.OldValue} to {e.NewValue}");
    
    // Custom logic: update another UI element (e.g., a label) with the new percentage.
    myLabel.Text = $"Progress: {progressBar.Percentage}%";
};

// Update the progress value to trigger the event.
progressBar.Value = 80;

Example 2: Detecting Animation Completion

This sample shows how to listen for the AnimationCompleted event to perform actions immediately after an animation finishes.

// Instantiate the progress bar control.
var progressBar = new SiticoneHBarsProgress();

// Subscribe to the AnimationCompleted event.
progressBar.AnimationCompleted += (sender, e) =>
{
    MessageBox.Show("Animation has completed successfully!");
    
    // Additional actions can be performed here after the animation ends.
};

// Start an animation by updating the progress value.
progressBar.Value = 90;

Example 3: Responding to Animation State Changes

This example illustrates the use of the AnimationStateChanged event to detect when an animation starts or stops, allowing synchronization with other UI components.

// Instantiate the progress bar control.
var progressBar = new SiticoneHBarsProgress();

// Subscribe to the AnimationStateChanged event.
progressBar.AnimationStateChanged += (sender, e) =>
{
    if (e.IsAnimating)
    {
        Console.WriteLine("Animation started.");
        // Optionally disable other UI elements until the animation completes.
    }
    else
    {
        Console.WriteLine("Animation stopped.");
        // Re-enable UI elements or perform other actions after animation ends.
    }
};

// Initiate an animation by changing the progress value.
progressBar.Value = 65;

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Key Points

Aspect	Details
Event-Driven Architecture	The control uses events to communicate state changes, making it easy to hook into progress updates and animation transitions.
Real-Time Feedback	Through the AnimationStateChanged event, developers can receive immediate feedback when an animation starts or stops, which can be used to synchronize UI elements.
Customizable Callbacks	Each event passes detailed information via custom EventArgs (e.g., ProgressChangedEventArgs and AnimationStateChangedEventArgs) to allow tailored response logic.
Synchronization	Events can be used to ensure that updates across multiple components remain in sync, particularly in dynamic or interactive applications.

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Best Practices

Practice	Description
Subscribe Early	Register for the events as soon as the control is initialized to ensure no state changes are missed, particularly during the initial load or rapid progress updates.
Manage Event Handlers	Always unsubscribe from events when the control is disposed or no longer needed to prevent memory leaks and unintended callbacks.
Use Detailed Logging	Utilize the data provided by event arguments (old and new progress values, animation state) for debugging and maintaining a clear log of the control's behavior.
Synchronize with Other Components	Use the events to coordinate UI updates across different components, ensuring that the state of the progress bar is reflected consistently elsewhere in the application.

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Common Pitfalls

Pitfall	Cause/Resolution
Missing Unsubscription	Failing to unsubscribe from events may lead to memory leaks or unexpected behavior; ensure to clean up event handlers when the control is disposed or no longer in use.
Overloading Event Handlers	Handling too many operations inside an event handler can lead to UI lag; offload intensive tasks or use asynchronous processing where necessary.
Ignoring Event Data	Not utilizing the provided event argument data (such as the previous and new progress values) can lead to missed opportunities for meaningful UI updates and logging.
Confusing Animation State Changes	Misinterpreting the AnimationStateChanged event (e.g., assuming the animation is complete when it has merely stopped temporarily) can cause synchronization issues in the UI.

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Usage Scenarios

Scenario	Implementation Details
Progress Reporting in Multi-Step Tasks	Use the ProgressChanged event to update a status panel or log progress during multi-step operations, ensuring that both intermediate and final states are communicated clearly.
Coordinated UI Updates	Synchronize animations across multiple controls by subscribing to AnimationStateChanged events; for example, disable other interactive elements while the progress bar is animating.
Real-Time Data Monitoring	In dashboards or data monitoring applications, use the ProgressChanged event to drive real-time updates and notifications based on the control’s progress value.
Conditional UI Flows	Leverage the AnimationCompleted event to trigger subsequent actions (e.g., loading new content or transitioning views) only after the progress animation has fully completed.

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Review

Category	Review Comments
Responsiveness	The event-driven design ensures that the control is highly responsive to state changes, providing a smooth user experience through real-time updates and callbacks.
Flexibility	With distinct events for progress changes, animation completions, and state transitions, developers can choose the level of integration needed for their applications.
Debugging and Maintenance	Detailed event arguments simplify debugging and logging, making it easier to track down issues related to progress updates and animations.
Integration Ease	Clear documentation and consistent API behavior allow for straightforward integration into diverse WinForms projects.

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Summary

The Events and Callbacks feature of the SiticoneHBarsProgress component enables comprehensive monitoring and response to the control's internal state changes. With events such as ProgressChanged, AnimationCompleted, and AnimationStateChanged, developers can implement tailored logic to synchronize UI updates, coordinate animations, and maintain responsive, interactive interfaces. Adhering to best practices in event management and handling can further ensure a robust and maintainable application.

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Additional Notes

Note	Details
Event Handler Lifecycle Management	Always remove event handlers when the control is disposed to avoid potential memory leaks or unwanted callbacks after the control's lifecycle has ended.
Combining with Other Features	The events work in tandem with other features such as Animation Control, Progress Value Management, and Display and Interaction, providing a cohesive framework for interactive UI design.
Debugging Strategies	Incorporate logging or breakpoints within event handlers during development to monitor state changes and ensure that all UI components remain in sync with the control’s events.
Custom Callback Extensions	Developers can extend the behavior of the default events by creating additional custom events or wrappers around the provided ones to better integrate with complex application logic.

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This extensive documentation on Events and Callbacks provides all the necessary details, best practices, and examples to help developers effectively integrate and customize event-driven behavior in their .NET WinForms applications using the SiticoneHBarsProgress component.