Add docs to UIInputContext.

Voile/Source/UI/UIInputContext.cs

@@ -3,19 +3,48 @@ using Voile.Input;
 
 namespace Voile.UI;
 
+/// <summary>
+/// Input information for UI elements.
+/// </summary>
 public class UIInputContext
 {
+    /// <summary>
+    /// Current action handled by this <see cref="UIElement"/>.
+    /// </summary>
     public IInputAction Action { get; }
+    /// <summary>
+    /// Current mouse position.
+    /// </summary>
     public Vector2 MousePosition { get; }
+    /// <summary>
+    /// Determines if a mouse button was pressed.
+    /// </summary>
     public bool MousePressed { get; set; }
+    /// <summary>
+    /// Determines if a mouse button was released.
+    /// </summary>
     public bool MouseReleased { get; set; }
+    /// <summary>
+    /// Determines if a mouse button is currently held.
+    /// </summary>
     public bool MouseDown { get; set; }
-
+    /// <summary>
+    /// Name of the current <see cref="IInputAction"/>.
+    /// </summary>
     public string ActionName { get; }
-
+    /// <summary>
+    /// Keycode of a currently pressed character.
+    /// </summary>
     public int CharPressed { get; }
+
+    /// <summary>
+    /// Determines if this <see cref="UIInputContext"/> registered any character input from keyboard.
+    /// </summary>
     public bool HasCharInput => CharPressed != 0;
 
+    /// <summary>
+    /// Determines if this context's input was already handled and no longer needs to be processed.
+    /// </summary>
     public bool Handled => _handled;
 
     /// <summary>