Added highlight of dropdown items on mouse move

src/AcaciaZPushPlugin/AcaciaZPushPlugin/AcaciaZPushPlugin.csproj

@@ -241,6 +241,9 @@
     <Compile Include="Controls\KHintButton.cs">
       <SubType>Component</SubType>
     </Compile>
+    <Compile Include="Controls\KListBox.cs">
+      <SubType>Component</SubType>
+    </Compile>
     <Compile Include="Controls\KProgressBar.cs">
       <SubType>Component</SubType>
     </Compile>

src/AcaciaZPushPlugin/AcaciaZPushPlugin/Controls/KAbstractComboBox.cs

@@ -215,23 +215,14 @@ namespace Acacia.Controls
         // Cannot use visibility of _dropDown to keep the open state, as clicking on the button already
         // hides the popup before the event handler is shown.
         private bool _isDroppedDown;
-        private bool _clickedButton;
 
         private void _dropDown_Closed(object sender, ToolStripDropDownClosedEventArgs e)
         {
-            /*if (_stateButton.IsMouseOver)
-            {
-                _clickedButton = true;
-            }*/
             _isDroppedDown = false;
         }
 
         private void Button_Clicked()
         {
-            /*if (_clickedButton)
-                _clickedButton = false;
-            else
-                DroppedDown = true;*/
             DroppedDown = !DroppedDown;
             this._edit.Focus();
         }
@@ -258,7 +249,6 @@ namespace Acacia.Controls
                         _dropControl.Height = Util.Bound(prefSize.Height, minHeight, maxHeight);
                         // Show the drop down below the current control
                         _dropDown.Show(this.PointToScreen(new Point(0, Height)));
-                        _dropDown.Capture = true;
                     }
                     else
                     {

src/AcaciaZPushPlugin/AcaciaZPushPlugin/Controls/KComboBox.cs

@@ -14,7 +14,7 @@ namespace Acacia.Controls
 {
     public class KComboBox : KAbstractComboBox
     {
-        private readonly ListBox _list;
+        protected readonly KListBox _list;
 
         #region Items properties
 
@@ -45,10 +45,16 @@ namespace Acacia.Controls
         public KComboBox()
         {
             MaxDropDownItems = 8;
-            _list = new ListBox();
+            _list = new KListBox();
             _list.IntegralHeight = true;
             DropControl = _list;
             _list.DisplayMember = "DisplayName"; // TODO: remove from here
+            _list.SelectedIndexChanged += _list_SelectedIndexChanged;
+        }
+
+        private void _list_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            System.Diagnostics.Trace.WriteLine("SELECTED: " + _list.SelectedIndex);
         }
 
         public void BeginUpdate()

src/AcaciaZPushPlugin/AcaciaZPushPlugin/Controls/KListBox.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace Acacia.Controls
+{
+    public class KListBox : ListBox
+    {
+        private int _hoverIndex = -1;
+
+        public KListBox()
+        {
+            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
+            DrawMode = DrawMode.OwnerDrawFixed;
+        }
+
+        protected override void OnMouseMove(MouseEventArgs e)
+        {
+            Point point = PointToClient(Cursor.Position);
+            int newIndex = IndexFromPoint(point);
+            if (newIndex != _hoverIndex)
+            {
+                int oldIndex = _hoverIndex;
+                _hoverIndex = newIndex;
+                InvalidateItem(oldIndex);
+                InvalidateItem(_hoverIndex);
+            }
+        }
+
+        protected override void OnMouseLeave(EventArgs e)
+        {
+            base.OnMouseLeave(e);
+            _hoverIndex = -1;
+        }
+
+        protected override void OnVisibleChanged(EventArgs e)
+        {
+            base.OnVisibleChanged(e);
+            _hoverIndex = -1;
+        }
+
+        private void InvalidateItem(int index)
+        {
+            if (index < 0)
+                return;
+            Invalidate(GetItemRectangle(index));
+        }
+
+        protected override void OnDrawItem(DrawItemEventArgs e)
+        {
+            // Create a custom event instance to be able to set the selected state for mouse hover
+            DrawItemState state = e.State;
+            if (_hoverIndex >= 0)
+            {
+                state = _hoverIndex == e.Index ? DrawItemState.Selected : DrawItemState.None;
+            }
+            DrawItemEventArgs draw = new DrawItemEventArgs(e.Graphics, e.Font, e.Bounds, e.Index, state);
+            draw.DrawBackground();
+
+            string text = Items[draw.Index].ToString();
+            using (StringFormat format = new StringFormat())
+            {
+                format.LineAlignment = StringAlignment.Center;
+                using (Brush brush = new SolidBrush(draw.ForeColor))
+                {
+                    draw.Graphics.DrawString(text,
+                        draw.Font, brush,
+                        draw.Bounds,
+                        format);
+                }
+            }
+        }
+    }
+}