Squashed 'FSI.Lib/' content from commit 6aa4846

git-subtree-dir: FSI.Lib
git-subtree-split: 6aa48465a834a7bfdd9cbeae8d2e4f769d0c0ff8

FSI.Lib/Wpf/Ctrls/ChbWindowsTopMost.xaml.cs

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+using System;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Interop;
+
+namespace FSI.Lib.Wpf.Ctrls
+{
+    /// <summary>
+    /// Interaktionslogik für ChbWindowsTopMost.xaml
+    /// </summary>
+    public partial class ChbWindowsTopMost : UserControl
+    {
+        private Window _window;
+
+        //A window receives this message when the user chooses a command from the Window menu, or when the user chooses the maximize button, minimize button, restore button, or close button.
+        public const Int32 WM_SYSCOMMAND = 0x112;
+
+        //Draws a horizontal dividing line.This flag is used only in a drop-down menu, submenu, or shortcut menu.The line cannot be grayed, disabled, or highlighted.
+        public const Int32 MF_SEPARATOR = 0x800;
+
+        //Specifies that an ID is a position index into the menu and not a command ID.
+        public const Int32 MF_BYPOSITION = 0x400;
+
+        //Specifies that the menu item is a text string.
+        public const Int32 MF_STRING = 0x0;
+
+        //Menu Ids for our custom menu items
+        public const Int32 _ItemTopMostId = 1000;
+        
+        [DllImport("user32.dll")]
+        private static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
+
+        [DllImport("user32.dll")]
+        private static extern bool InsertMenu(IntPtr hMenu, Int32 wPosition, Int32 wFlags, Int32 wIDNewItem, string lpNewItem);
+
+        public ChbWindowsTopMost()
+        {
+            InitializeComponent();
+            Loaded += ChbWindowsTopMost_Loaded;
+        }
+
+        private void ChbWindowsTopMost_Loaded(object sender, RoutedEventArgs e)
+        {
+            _window = Window.GetWindow(this);
+
+            IntPtr windowhandle = new WindowInteropHelper(_window).Handle;
+            HwndSource hwndSource = HwndSource.FromHwnd(windowhandle);
+
+            //Get the handle for the system menu
+            IntPtr systemMenuHandle = GetSystemMenu(windowhandle, false);
+
+            //Insert our custom menu items
+            InsertMenu(systemMenuHandle, 5, MF_BYPOSITION | MF_SEPARATOR, 0, string.Empty); //Add a menu seperator
+            InsertMenu(systemMenuHandle, 6, MF_BYPOSITION, _ItemTopMostId, "immer im Vordergrund"); //Add a setting menu item
+
+            hwndSource.AddHook(new HwndSourceHook(WndProc));
+        }
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            // Check if the SystemCommand message has been executed
+            if (msg == WM_SYSCOMMAND)
+            {
+                //check which menu item was clicked
+                switch (wParam.ToInt32())
+                {
+                    case _ItemTopMostId:
+                        _window.Topmost = !_window.Topmost;
+                        chbTopMost.IsChecked = _window.Topmost;
+                        handled = true;
+                        break;
+
+                }
+            }
+
+            return IntPtr.Zero;
+        }
+
+        private void CheckBox_Checked(object sender, RoutedEventArgs e)
+        {
+            _window.Topmost = true;
+        }
+
+        private void CheckBox_Unchecked(object sender, RoutedEventArgs e)
+        {
+            _window.Topmost = false;
+        }
+    }
+}