From 8f3e912c1c55f2375d79cf8104bbdae8bdf708fd Mon Sep 17 00:00:00 2001
From: Bruce Wayne <admin@bige0.com>
Date: Wed, 22 Jan 2020 15:10:33 +0800
Subject: [PATCH] Support search mode

---
 Netch/Forms/MainForm.Designer.cs |  10 +-
 Netch/Override/SearchComboBox.cs | 152 +++++++++++++++++++++++++++++++
 2 files changed, 158 insertions(+), 4 deletions(-)
 create mode 100644 Netch/Override/SearchComboBox.cs

diff --git a/Netch/Forms/MainForm.Designer.cs b/Netch/Forms/MainForm.Designer.cs
index 32f59e75..157d777a 100644
--- a/Netch/Forms/MainForm.Designer.cs
+++ b/Netch/Forms/MainForm.Designer.cs
@@ -1,4 +1,6 @@
-namespace Netch.Forms
+using Netch.Override;
+
+namespace Netch.Forms
 {
     partial class MainForm
     {
@@ -56,7 +58,7 @@
             this.DeletePictureBox = new System.Windows.Forms.PictureBox();
             this.EditPictureBox = new System.Windows.Forms.PictureBox();
             this.ModeLabel = new System.Windows.Forms.Label();
-            this.ModeComboBox = new System.Windows.Forms.ComboBox();
+            this.ModeComboBox = new System.Windows.Forms.SearchComboBox();
             this.ServerComboBox = new System.Windows.Forms.ComboBox();
             this.ServerLabel = new System.Windows.Forms.Label();
             this.StatusStrip = new System.Windows.Forms.StatusStrip();
@@ -328,7 +330,7 @@
             // ModeComboBox
             // 
             this.ModeComboBox.DrawMode = System.Windows.Forms.DrawMode.OwnerDrawFixed;
-            this.ModeComboBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
+            this.ModeComboBox.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDown;
             this.ModeComboBox.FormattingEnabled = true;
             this.ModeComboBox.IntegralHeight = false;
             this.ModeComboBox.Location = new System.Drawing.Point(57, 53);
@@ -526,7 +528,7 @@
         private System.Windows.Forms.GroupBox ConfigurationGroupBox;
         private System.Windows.Forms.Label ServerLabel;
         private System.Windows.Forms.Label ModeLabel;
-        private System.Windows.Forms.ComboBox ModeComboBox;
+        private System.Windows.Forms.SearchComboBox ModeComboBox;
         private System.Windows.Forms.ComboBox ServerComboBox;
         private System.Windows.Forms.StatusStrip StatusStrip;
         private System.Windows.Forms.ToolStripStatusLabel StatusLabel;
diff --git a/Netch/Override/SearchComboBox.cs b/Netch/Override/SearchComboBox.cs
new file mode 100644
index 00000000..267edca1
--- /dev/null
+++ b/Netch/Override/SearchComboBox.cs
@@ -0,0 +1,152 @@
+using System.Diagnostics;
+using System.Linq;
+
+namespace System.Windows.Forms
+{
+    [System.ComponentModel.DesignerCategory(@"Code")]
+    public class SearchComboBox : ComboBox
+    {
+        public SearchComboBox()
+        {
+            AutoCompleteMode = AutoCompleteMode.Suggest;
+        }
+
+        protected override void OnTextChanged(EventArgs e)
+        {
+            try
+            {
+                if (DesignMode || !string.IsNullOrEmpty(Text) || !Visible) return;
+
+                ResetCompletionList();
+            }
+            finally
+            {
+                base.OnTextChanged(e);
+            }
+        }
+
+        protected override void OnKeyUp(KeyEventArgs e)
+        {
+            try
+            {
+                if (DesignMode || e.KeyData == Keys.Up || e.KeyData == Keys.Down) return;
+
+                if (e.KeyData == Keys.Return)
+                {
+                    e.Handled = true;
+                    if (newList.Length > 0 && !newList.Select(o => o.ToString()).Contains(Text))
+                    {
+                        Text = newList[0].ToString();
+                    }
+
+                    DroppedDown = false;
+                    return;
+                }
+
+                ReevaluateCompletionList();
+            }
+            finally
+            {
+                base.OnKeyUp(e);
+            }
+        }
+
+        private void ResetCompletionList()
+        {
+            _previousSearchTerm = null;
+            try
+            {
+                SuspendLayout();
+
+                var originalList = (object[])Tag;
+                if (originalList == null)
+                {
+                    Tag = originalList = Items.Cast<object>().ToArray();
+                }
+
+                if (Items.Count == originalList.Length) return;
+
+                while (Items.Count > 0)
+                {
+                    Items.RemoveAt(0);
+                }
+
+                Items.AddRange(originalList);
+            }
+            finally
+            {
+                ResumeLayout(true);
+            }
+        }
+
+        private string _previousSearchTerm;
+        private object[] newList;
+        private void ReevaluateCompletionList()
+        {
+            var currentSearchTerm = Text.ToLowerInvariant();
+            if (currentSearchTerm == _previousSearchTerm) return;
+
+            _previousSearchTerm = currentSearchTerm;
+            try
+            {
+                SuspendLayout();
+
+                var originalList = (object[])Tag;
+                if (originalList == null)
+                {
+                    Tag = originalList = Items.Cast<object>().ToArray();
+                }
+
+                if (string.IsNullOrEmpty(currentSearchTerm))
+                {
+                    if (Items.Count == originalList.Length) return;
+
+                    newList = originalList;
+                }
+                else
+                {
+                    newList = originalList.Where(x => x.ToString().ToLowerInvariant().Contains(currentSearchTerm)).ToArray();
+                }
+
+                try
+                {
+                    while (Items.Count > 0)
+                    {
+                        Items.RemoveAt(0);
+                    }
+                }
+                catch
+                {
+                    try
+                    {
+                        Items.Clear();
+                    }
+                    catch
+                    {
+                        // ignored
+                    }
+                }
+
+                Items.AddRange(newList.ToArray());
+            }
+            finally
+            {
+                if (currentSearchTerm.Length >= 2 && !DroppedDown)
+                {
+                    DroppedDown = true;
+                    Cursor.Current = Cursors.Default;
+                    Text = currentSearchTerm;
+                    Select(currentSearchTerm.Length, 0);
+                }
+
+                if (Items.Count > 0)
+                {
+                    DroppedDown = false;
+                    DroppedDown = true;
+                }
+
+                ResumeLayout(true);
+            }
+        }
+    }
+}