Added Dynamic Item (closes #8)

LemonUI/Menus/NativeDynamicItem.cs

@@ -0,0 +1,161 @@
+using LemonUI.Elements;
+using System.Drawing;
+
+namespace LemonUI.Menus
+{
+    /// <summary>
+    /// Dynamic Items allow you to dynamically change the item shown to the user.
+    /// </summary>
+    /// <typeparam name="T">The type of item.</typeparam>
+    public class NativeDynamicItem<T> : NativeSlidableItem
+    {
+        #region Fields
+
+        private T item = default;
+        private ScaledText text = new ScaledText(PointF.Empty, "", 0.35f)
+        {
+            Color = NativeMenu.colorWhiteSmoke
+        };
+
+        #endregion
+
+        #region Properties
+
+        /// <summary>
+        /// The currently selected item.
+        /// </summary>
+        public T SelectedItem
+        {
+            get => item;
+            set
+            {
+                item = value;
+            }
+        }
+
+        #endregion
+
+        #region Events
+
+        /// <summary>
+        /// Event triggered when the user has changed the item.
+        /// </summary>
+        public event ItemChangedEventHandler<T> ItemChanged;
+
+        #endregion
+
+        #region Constructor
+
+        /// <summary>
+        /// Creates a new Dynamic List Item.
+        /// </summary>
+        /// <param name="title">The Title of the item.</param>
+        public NativeDynamicItem(string title) : this(title, "", default)
+        {
+        }
+        /// <summary>
+        /// Creates a new Dynamic List Item.
+        /// </summary>
+        /// <param name="title">The Title of the item.</param>
+        /// <param name="item">The Item to set.</param>
+        public NativeDynamicItem(string title, T item) : this(title, "", item)
+        {
+        }
+        /// <summary>
+        /// Creates a new Dynamic List Item.
+        /// </summary>
+        /// <param name="title">The Title of the item.</param>
+        /// <param name="description">The Description of the item.</param>
+        public NativeDynamicItem(string title, string description) : this(title, description, default)
+        {
+        }
+        /// <summary>
+        /// Creates a new Dynamic List Item.
+        /// </summary>
+        /// <param name="title">The Title of the item.</param>
+        /// <param name="description">The Description of the item.</param>
+        /// <param name="item">The Item to set.</param>
+        public NativeDynamicItem(string title, string description, T item) : base(title, description)
+        {
+            this.item = item;
+        }
+
+        #endregion
+
+        #region Functions
+
+        /// <summary>
+        /// Updates the currently selected item based on the index.
+        /// </summary>
+        private void UpdateItemName()
+        {
+            // This is the SAME as the normal NativeListItem
+
+            text.Text = !SelectedItem.Equals(default) ? SelectedItem.ToString() : "";
+
+            text.Position = new PointF(RightArrow.Position.X - text.Width + 3, text.Position.Y);
+            LeftArrow.Position = new PointF(text.Position.X - LeftArrow.Size.Width, LeftArrow.Position.Y);
+        }
+        /// <summary>
+        /// Gets the previous item.
+        /// </summary>
+        public override void GoLeft()
+        {
+            ItemChangedEventArgs<T> arguments = new ItemChangedEventArgs<T>(item, -1, Direction.Left);
+            ItemChanged?.Invoke(this, arguments);
+            SelectedItem = arguments.Object;
+            UpdateItemName();
+        }
+        /// <summary>
+        /// Gets the next item.
+        /// </summary>
+        public override void GoRight()
+        {
+            ItemChangedEventArgs<T> arguments = new ItemChangedEventArgs<T>(item, -1, Direction.Right);
+            ItemChanged?.Invoke(this, arguments);
+            SelectedItem = arguments.Object;
+            UpdateItemName();
+        }
+        /// <summary>
+        /// Recalculates the position of the current List Item.
+        /// </summary>
+        /// <param name="pos">The new position of the item.</param>
+        /// <param name="size">The Size of the item.</param>
+        /// <param name="selected">If the item is selected or not.</param>
+        public override void Recalculate(PointF pos, SizeF size, bool selected)
+        {
+            // This is the SAME as the normal NativeListItem
+
+            base.Recalculate(pos, size, selected);
+
+            if (!Enabled)
+            {
+                text.Color = NativeMenu.colorDisabled;
+            }
+            else if (selected)
+            {
+                text.Color = NativeMenu.colorBlack;
+            }
+            else
+            {
+                text.Color = NativeMenu.colorWhiteSmoke;
+            }
+
+            float textWidth = RightArrow.Size.Width;
+            text.Position = new PointF(pos.X + size.Width - textWidth - 1 - text.Width, pos.Y + 3);
+            LeftArrow.Position = new PointF(text.Position.X - LeftArrow.Size.Width, pos.Y + 4);
+
+            UpdateItemName();
+        }
+        /// <summary>
+        /// Draws the List on the screen.
+        /// </summary>
+        public override void Draw()
+        {
+            base.Draw(); // Arrows, Title and Left Badge
+            text.Draw();
+        }
+
+        #endregion
+    }
+}