Connected.Components/Components/Rating/Rating.razor.cs

using Connected.Annotations;
using Connected.Utilities;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;

namespace Connected.Components;

public partial class Rating : UIComponent
{
   /// <summary>
   /// Space separated class names
   /// </summary>
   protected string ClassName =>
   new CssBuilder("")
     .AddClass($"mud-rating-root")
     .AddClass(Class)
   .Build();

   /// <summary>
   /// User class names for RatingItems, separated by space
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public string RatingItemsClass { get; set; }

   /// <summary>
   /// User styles for RatingItems.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public string RatingItemsStyle { get; set; }

   /// <summary>
   /// Input name. If not initialized, name will be random guid.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Behavior)]
   public string Name { get; set; } = Guid.NewGuid().ToString();

   /// <summary>
   /// Max value and how many elements to click will be generated. Default: 5
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Behavior)]
   public int MaxValue { get; set; } = 5;

   /// <summary>
   /// Selected or hovered icon. Default @Icons.Material.Star
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public string FullIcon { get; set; } = Icons.Material.Filled.Star;

   /// <summary>
   /// Non selected item icon. Default @Icons.Material.StarBorder
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public string EmptyIcon { get; set; } = Icons.Material.Filled.StarBorder;

   /// <summary>
   /// The color of the component. It supports the theme colors.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public ThemeColor Color { get; set; } = ThemeColor.Default;
   /// <summary>
   /// The Size of the icons.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public Size Size { get; set; } = Size.Medium;
   /// <summary>
   /// If true, disables ripple effect.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Appearance)]
   public bool DisableRipple { get; set; }
   /// <summary>
   /// If true, the controls will be disabled.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Behavior)]
   public bool Disabled { get; set; }
   /// <summary>
   /// If true, the ratings will show without interactions.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Behavior)]
   public bool ReadOnly { get; set; }

   /// <summary>
   /// Fires when SelectedValue changes.
   /// </summary>
   [Parameter] public EventCallback<int> SelectedValueChanged { get; set; }

   /// <summary>
   /// Selected value. This property is two-way bindable.
   /// </summary>
   [Parameter]
   [Category(CategoryTypes.Rating.Data)]
   public int SelectedValue
   {
      get => _selectedValue;
      set
      {
         if (_selectedValue == value)
            return;

         _selectedValue = value;

         SelectedValueChanged.InvokeAsync(_selectedValue);
      }
   }

   private int _selectedValue = 0;

   /// <summary>
   /// Fires when hovered value change. Value will be null if no rating item is hovered.
   /// </summary>
   [Parameter] public EventCallback<int?> HoveredValueChanged { get; set; }

   internal int? HoveredValue
   {
      get => _hoveredValue;
      set
      {
         if (_hoveredValue == value)
            return;

         _hoveredValue = value;
         HoveredValueChanged.InvokeAsync(value);
      }
   }

   private int? _hoveredValue = null;

   internal bool IsRatingHover => HoveredValue.HasValue;

   private void HandleItemClicked(int itemValue)
   {
      SelectedValue = itemValue;

      if (itemValue == 0)
      {
         HoveredValue = null;
      }
   }

   internal void HandleItemHovered(int? itemValue) => HoveredValue = itemValue;

   private void IncreaseValue(int val)
   {
      if ((SelectedValue == MaxValue && val > 0) || (SelectedValue == 0 && val < 0))
      {

      }
      else
      {
         SelectedValue += val;
      }
   }

   protected internal void HandleKeyDown(KeyboardEventArgs obj)
   {
      if (Disabled || ReadOnly)
      {
         return;
      }

      switch (obj.Key)
      {
         case "ArrowRight":
            if (obj.ShiftKey == true)
            {
               IncreaseValue(MaxValue - SelectedValue);
            }
            else
            {
               IncreaseValue(1);
            }
            break;
         case "ArrowLeft":
            if (obj.ShiftKey == true)
            {
               IncreaseValue(-SelectedValue);
            }
            else
            {
               IncreaseValue(-1);
            }
            break;
      }
   }
}