Merge pull request #2545 from magriggs/issue-1308

Some fixes for issue mRemoteNG#1308. Inspired by dockpanelsuite/dockp…

mRemoteNG/UI/Tabs/FloatWindowNG.cs

@@ -1,4 +1,8 @@
-using System.Drawing;
+using System;
+using System.Drawing;
+using System.Runtime.InteropServices;
+using System.Security.Permissions;
+using System.Windows.Forms;
 using WeifenLuo.WinFormsUI.Docking;
 
 namespace mRemoteNG.UI.Tabs
@@ -8,11 +12,69 @@ namespace mRemoteNG.UI.Tabs
         public FloatWindowNG(DockPanel dockPanel, DockPane pane)
             : base(dockPanel, pane)
         {
+            setDefaultProperties();
         }
 
         public FloatWindowNG(DockPanel dockPanel, DockPane pane, Rectangle bounds)
             : base(dockPanel, pane, bounds)
         {
+            setDefaultProperties();
+        }
+
+        private void setDefaultProperties()
+        {
+            FormBorderStyle = FormBorderStyle.Sizable;
+
+            // To enable Alt+Tab between your undocked forms and your main form
+            ShowInTaskbar = true;
+            Owner = null;
+
+            // Allow the Windows default behavior of maximizing/restoring the window
+            DoubleClickTitleBarToDock = true;
+        }
+
+        [DllImport("User32.dll", CharSet = CharSet.Auto)]
+        public static extern uint SendMessage(IntPtr hWnd, int Msg, uint wParam, uint lParam);
+
+        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
+        protected override void WndProc(ref Message m)
+        {
+            int WM_NCLBUTTONDOWN = 0x00A1;
+            int WM_SYSCOMMAND = 0x0112;
+
+            int SC_MINIMIZE = 0xF020;
+            int SC_RESTORE = 0xF120;
+
+            if (m.Msg == WM_NCLBUTTONDOWN)
+            {
+                if (IsDisposed)
+                    return;
+
+                if ((uint)m.WParam == 8) // Check if button down occured in minimize box
+                {
+                    if (WindowState == FormWindowState.Minimized)
+                        FloatWindowNG.SendMessage(Handle, (int)WM_SYSCOMMAND, (uint)SC_RESTORE, 0);
+                    else
+                        FloatWindowNG.SendMessage(Handle, (int)WM_SYSCOMMAND, (uint)SC_MINIMIZE, 0);
+
+                    return;
+                }
+            }
+
+            base.WndProc(ref m);
+        }
+    }
+
+    public class CustomFloatWindowFactory : DockPanelExtender.IFloatWindowFactory
+    {
+        public FloatWindow CreateFloatWindow(DockPanel dockPanel, DockPane pane, Rectangle bounds)
+        {
+            return new FloatWindowNG(dockPanel, pane, bounds);
+        }
+
+        public FloatWindow CreateFloatWindow(DockPanel dockPanel, DockPane pane)
+        {
+            return new FloatWindowNG(dockPanel, pane);
         }
     }
 }