Added X button for SWQL Studio Tabs (solarwinds#49)

Src/SwqlStudio/Controls/TabControlEx.cs

@@ -0,0 +1,73 @@
+using System;
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Windows.Forms;
+
+namespace SwqlStudio.Controls
+{
+    /// <summary>
+    /// Tabcontrol with the 'X' button for each tab
+    /// </summary>
+    internal class TabControlEx : TabControl
+    {
+        private const int CloseButtonPadding = 15;
+        private const string CloseButtonText = "×";
+        private readonly Lazy<Size> _closeButtonSize;
+        public TabControlEx()
+        {
+            DrawMode = TabDrawMode.OwnerDrawFixed;
+            SizeMode = TabSizeMode.Fixed;
+
+            _closeButtonSize = new Lazy<Size>(() => TextRenderer.MeasureText(CloseButtonText, Font));
+        }
+
+        protected override void OnControlAdded(ControlEventArgs e)
+        {
+            base.OnControlAdded(e);
+
+            // recompute tab widths
+            int maxTabLength = TabPages.Cast<TabPage>()
+                .Select(currentPage => TextRenderer.MeasureText(currentPage.Text, Font).Width + Padding.X + Padding.X + CloseButtonPadding)
+                .DefaultIfEmpty(0)
+                .Max();
+
+            var newItemWidth = Math.Max(maxTabLength, ItemSize.Width);
+
+            var newItemSize = new Size(newItemWidth, ItemSize.Height);
+
+            if (ItemSize != newItemSize)
+            {
+                ItemSize = newItemSize;
+            }
+        }
+
+        protected override void OnMouseDown(MouseEventArgs e)
+        {
+            base.OnMouseDown(e);
+
+            var closeButtonSize = _closeButtonSize.Value;
+
+            for (int i = 0; i < TabPages.Count; i++)
+            {
+                var tabRectangle = GetTabRect(i);
+                var tabCloseButton = new Rectangle(tabRectangle.Right - CloseButtonPadding, tabRectangle.Top + Padding.Y, closeButtonSize.Width, closeButtonSize.Height);
+
+                if (tabCloseButton.Contains(e.Location))
+                {
+                    TabPages.RemoveAt(i);
+                    break;
+                }
+            }
+        }
+
+        protected override void OnDrawItem(DrawItemEventArgs e)
+        {
+            TextRenderer.DrawText(e.Graphics, CloseButtonText, e.Font, new Point(e.Bounds.Right - CloseButtonPadding, e.Bounds.Top + Padding.Y), Color.Black);
+            TextRenderer.DrawText(e.Graphics, TabPages[e.Index].Text, e.Font, new Point(e.Bounds.Location.X + Padding.X, e.Bounds.Top + Padding.Y), Color.Black);
+
+            e.DrawFocusRectangle();
+        }
+    }
+}

Src/SwqlStudio/SwqlStudio.csproj

@@ -119,6 +119,9 @@
     </Compile>
     <Compile Include="ConnectionHistory.cs" />
     <Compile Include="ConnectionInfo.cs" />
+    <Compile Include="Controls\TabControlEx.cs">
+      <SubType>Component</SubType>
+    </Compile>
     <Compile Include="CustomCertificateValidator.cs" />
     <Compile Include="DataGridExporter.cs" />
     <Compile Include="EntityClassGraphForm.cs">