Add Key Handling Support

User input via the keyboard is handled by the IKeyHandlingService.  For a class or view model to handle keyboard input in must implement IKeyHandlingSupported.

A new IKeyHandlingService must be created for each handling class and is created via IKeyHandlingServiceFactory: 

// Create key handling service
IKeyHandlingService keyHandlingService = keyHandlingServiceFactory.Create(this.InstanceIdentifier);

Registering Keyboard Input

Any key or key combination requiring handling will have to have its own IKeyInputCommandInfo creating: 

internal sealed class NextPageInputCommandInfo : KeyInputCommandInfoBase
{
    // Unique identifier for this key combination
    public static readonly InputCommandId = 
    new Guid("14C0C59F-F3D0-4528-A899-3E02A229EF9B");
 
    public NextPageInputCommandInfo()
        : base(
            InputCommandId.NextPageage,
            "Move to the next page",
            new[]
            {
            new KeyInputGesture(Key.PageDown)
            })
    {
    }
}

All IKeyInputCommandInfo classes will need registering in the IoC container.  An easy way of doing this for all instances is to use the following code: 

builder.RegisterTypes(
    typeof(PluginModule)
        .Assembly
        .GetTypes()
        .Where(t => t.GetInterfaces().Contains(typeof(IKeyInputCommandInfo)))
        .ToArray())
        .As<IKeyInputCommandInfo>();

Handling Keyboard Input

Keyboard input should be handle by using the following code: 

// Define the key handling logic method
IKeyInputCommandInfo<object, KeyInputInfo> handler = this.HandleNextPage;
 
// Register the handler with the unique identifier of the IKeyInputCommandInfo
keyHandlingService.RegisterKeyInputHandler(
    NextPageInputCommandInfo.InputCommandId,
    handler);