From 3b15853821d2afc3ecb671f77d0bb525f5be6de4 Mon Sep 17 00:00:00 2001
From: sladro <sladro@163.com>
Date: Wed, 18 Mar 2026 15:20:40 +0800
Subject: [PATCH] feat: Implement UI for drawing parameter input and note
 template preview.

---
 UI/DrawingParamsForm.cs | 28 +++++++++++++++++++++++++++-
 UI/ParamDrawingPanel.cs | 30 +++++++++++++++++++++++++++++-
 2 files changed, 56 insertions(+), 2 deletions(-)

diff --git a/UI/DrawingParamsForm.cs b/UI/DrawingParamsForm.cs
index 2d50571..7ec2320 100644
--- a/UI/DrawingParamsForm.cs
+++ b/UI/DrawingParamsForm.cs
@@ -758,7 +758,33 @@ namespace CadParamPluging.UI
         private ComboBox CreateEnumCombo(ParamDefinition def, string initialValue)
         {
             // Allow manual edit to match many "下拉列表...可手动编辑" cases.
-            var cb = new ComboBox { DropDownStyle = ComboBoxStyle.DropDown };
+            var cb = new ComboBox { DropDownStyle = ComboBoxStyle.DropDown, DrawMode = DrawMode.OwnerDrawFixed };
+            cb.DrawItem += (s, e) =>
+            {
+                if (e.Index < 0) return;
+                e.DrawBackground();
+                var text = cb.GetItemText(cb.Items[e.Index]);
+                TextRenderer.DrawText(e.Graphics, text, e.Font, e.Bounds, e.ForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter);
+                e.DrawFocusRectangle();
+
+                if (cb.DroppedDown && (e.State & DrawItemState.Selected) == DrawItemState.Selected)
+                {
+                    int lastHovered = cb.Tag is int i ? i : -1;
+                    if (lastHovered != e.Index)
+                    {
+                        cb.Tag = e.Index;
+                        var point = cb.PointToClient(Cursor.Position);
+                        point.Y += 20;
+                        _toolTip.Show(text, cb, point.X, point.Y);
+                    }
+                }
+            };
+            cb.DropDownClosed += (s, e) =>
+            {
+                _toolTip.Hide(cb);
+                cb.Tag = -1;
+            };
+
             var list = (def.EnumOptions ?? new List<string>())
                 .Where(x => !string.IsNullOrWhiteSpace(x))
                 .Select(x => x.Trim())
diff --git a/UI/ParamDrawingPanel.cs b/UI/ParamDrawingPanel.cs
index a9be87a..a723eb0 100644
--- a/UI/ParamDrawingPanel.cs
+++ b/UI/ParamDrawingPanel.cs
@@ -794,7 +794,35 @@ namespace CadParamPluging.UI
             var cb = new ComboBox
             {
                 DropDownStyle = ComboBoxStyle.DropDownList,
-                Width = 160
+                Width = 160,
+                DrawMode = DrawMode.OwnerDrawFixed
+            };
+
+            var toolTip = new ToolTip();
+            cb.DrawItem += (s, e) =>
+            {
+                if (e.Index < 0) return;
+                e.DrawBackground();
+                var text = cb.GetItemText(cb.Items[e.Index]);
+                TextRenderer.DrawText(e.Graphics, text, e.Font, e.Bounds, e.ForeColor, TextFormatFlags.Left | TextFormatFlags.VerticalCenter);
+                e.DrawFocusRectangle();
+
+                if (cb.DroppedDown && (e.State & DrawItemState.Selected) == DrawItemState.Selected)
+                {
+                    int lastHovered = cb.Tag is int i ? i : -1;
+                    if (lastHovered != e.Index)
+                    {
+                        cb.Tag = e.Index;
+                        var point = cb.PointToClient(Cursor.Position);
+                        point.Y += 20;
+                        toolTip.Show(text, cb, point.X, point.Y);
+                    }
+                }
+            };
+            cb.DropDownClosed += (s, e) =>
+            {
+                toolTip.Hide(cb);
+                cb.Tag = -1;
             };
 
             ResetComboBoxItems(cb, items);