fix: Add high-DPI support

Author: fuweichin

README.md

@@ -1,9 +1,9 @@
 # PortProxy for Windows
 
-[PortProxy for Windows](https://github.com/FuweiChin/portproxy-for-windows) is a port-redirect tool. It provides WinForms GUI, and uses Windows built-in `netsh` as underlying implmentation, to manage port redirections easily and efficiently.
+[PortProxy for Windows](https://github.com/fuweichin/portproxy-for-windows) is a port-redirect tool. It provides WinForms GUI, and uses Windows built-in `netsh` as underlying implementation, to manage port redirections easily and efficiently.
 
-<!--See also our [PortProxy for Linux](https://github.com/FuweiChin/portproxy-for-linux) and [PortProxy for macOS](https://github.com/FuweiChin/portproxy-for-macos)-->
+![](C:\Users\fuwei\source\repos\portproxy-for-windows\screenshot.png)
 
 ## Features
-+ Add/delete/change/list port redirection rules, for TCP only, from v4tov4, v6tov4, v6tov6 or v4tov6
++ Add/delete/change/list port redirection rules (TCP only)
 + Export existing rules as XML and import new rules from XML

portproxy/AboutForm.Designer.cs

@@ -118,8 +118,6 @@
     <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
   </resheader>
   <data name="richTextBox1.Text" xml:space="preserve">
-    <value>PortProxy for Windows is a port-redirect tool designed for beginners among developers/devops. It provides WinForms GUI, and uses Windows built-in netsh as underlying implmentation, to manage port redirections easily and efficiently.
-
-See also our PortProxy for Linux and PortProxy for macOS.</value>
+    <value>PortProxy for Windows is a port-redirect tool designed for beginners among developers/devops. It provides WinForms GUI, and uses Windows built-in netsh as underlying implmentation, to manage port redirections easily and efficiently.</value>
   </data>
 </root>

portproxy/AboutForm.resx

@@ -1,6 +1,8 @@
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 using System.Text.RegularExpressions;
+using System.Threading.Tasks;
 using System.Windows.Forms;
 
 namespace portproxy
@@ -15,6 +17,31 @@ public MainForm()
         {
             InitializeComponent();
         }
+        protected override void WndProc(ref Message m)
+        {
+            if (m.Msg == NativeMethods.WM_SHOWME)
+            {
+                ShowAndActivate();
+            }
+            base.WndProc(ref m);
+        }
+        private void ShowAndActivate()
+        {
+            if (!this.Visible)
+            {
+                this.Show();
+            }
+            if (this.WindowState == FormWindowState.Minimized)
+            {
+                this.WindowState = FormWindowState.Normal;
+            }
+            this.Activate();
+            this.TopMost = true;
+            Action<Task> cancelTopMost = (Task t) => {
+                this.TopMost = false;
+            };
+            Task.Delay(1000).ContinueWith(cancelTopMost);
+        }
 
         private void MainForm_Shown(object sender, EventArgs e)
         {
@@ -269,7 +296,7 @@ private bool IsValidPort(string text)
                 int port = Convert.ToInt32(text);
                 return port >= 0 && port <= 65535;
             }
-            catch(FormatException e)
+            catch (FormatException)
             {
                 return false;
             }
@@ -347,5 +374,33 @@ private void cmbDirection_SelectedIndexChanged(object sender, EventArgs e)
         {
             errorProvider1.Clear();
         }
+
+        private void ScaleListViewColumns(ListView listView, double dpr, double oldDpr)
+        {
+            foreach (ColumnHeader column in listView.Columns)
+            {
+                column.Width = (int)Math.Round(column.Width / oldDpr * dpr);
+            }
+        }
+
+        protected override void ScaleControl(SizeF factor, BoundsSpecified specified)
+        {
+            base.ScaleControl(factor, specified);
+            double oldDpr = 1;
+            double dpr = DeviceDpi / 96.0d;
+            ScaleListViewColumns(listRules, dpr, oldDpr);
+        }
+
+        private void MainForm_DpiChanged(object sender, DpiChangedEventArgs e)
+        {
+            double oldDpr = e.DeviceDpiOld / 96.0d;
+            double dpr = e.DeviceDpiNew / 96.0d;
+            ScaleListViewColumns(listRules, dpr, oldDpr);
+        }
+
+        private void MainForm_Load(object sender, EventArgs e)
+        {
+
+        }
     }
 }

portproxy/MainForm.Designer.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace portproxy
+{
+    internal class NativeMethods
+    {
+        /**
+         * Notify the main window and activate it
+         * Copied from https://stackoverflow.com/questions/19147/what-is-the-correct-way-to-create-a-single-instance-wpf-application#answer-522874
+         */
+        [DllImport("user32.dll")]
+        public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);
+
+        [DllImport("user32.dll")]
+        public static extern int RegisterWindowMessage(string message);
+
+        public const int HWND_BROADCAST = 0xffff;
+        public static readonly int WM_SHOWME = RegisterWindowMessage("WM_SHOWME");
+    }
+}