mcs/class/referencesource/System.Activities.Presentation/System.Activities.Presentation/System/Activities/Presentation/View/WindowExtensionMethods.cs

   1 //----------------------------------------------------------------
   2 // Copyright (c) Microsoft Corporation.  All rights reserved.
   3 //----------------------------------------------------------------
   4
   5 namespace System.Activities.Presentation.View
   6 {
   7     using System.Runtime.InteropServices;
   8     using System.Windows;
   9     using System.Windows.Interop;
  10     using Microsoft.Tools.Common;
  11
  12     static class WindowExtensionMethods
  13     {
  14         public static void ShowContextHelpButton(this Window window)
  15         {
  16             IntPtr hwnd = new WindowInteropHelper(window).Handle;
  17             IntPtr exStyle = Win32Interop.GetWindowLongPtr(hwnd, Win32Interop.GWL_EXSTYLE);
  18             if (IntPtr.Size == 4)
  19             {
  20                 exStyle = new IntPtr(exStyle.ToInt32() | Win32Interop.WS_EX_CONTEXTHELP);
  21             }
  22             else
  23             {
  24                 exStyle = new IntPtr(exStyle.ToInt64() | ((long)Win32Interop.WS_EX_CONTEXTHELP));
  25             }
  26             Win32Interop.SetWindowLongPtr(new HandleRef(window, hwnd), Win32Interop.GWL_EXSTYLE, exStyle);
  27         }
  28
  29         public static void HideMinMaxButton(this Window window)
  30         {
  31             IntPtr hwnd = new WindowInteropHelper(window).Handle;
  32             IntPtr style = Win32Interop.GetWindowLongPtr(hwnd, Win32Interop.GWL_STYLE);
  33             if (IntPtr.Size == 4)
  34             {
  35                 int intValue = style.ToInt32();
  36                 intValue = SetBit(Win32Interop.WS_MAXIMIZEBOX, intValue, false);
  37                 intValue = SetBit(Win32Interop.WS_MINIMIZEBOX, intValue, false);
  38                 style = new IntPtr(intValue);
  39             }
  40             else
  41             {
  42                 long longValue = style.ToInt64();
  43                 longValue = SetBit((long)Win32Interop.WS_MAXIMIZEBOX, longValue, false);
  44                 longValue = SetBit((long)Win32Interop.WS_MINIMIZEBOX, longValue, false);
  45                 style = new IntPtr(longValue);
  46             }
  47             Win32Interop.SetWindowLongPtr(new HandleRef(window, hwnd), Win32Interop.GWL_STYLE, style);
  48         }
  49
  50         public static void AddWindowsHook(this Window window, HwndSourceHook wmHandler)
  51         {
  52             IntPtr hwnd = new WindowInteropHelper(window).Handle;
  53             HwndSource source = HwndSource.FromHwnd(hwnd);
  54             source.AddHook(wmHandler);
  55         }
  56
  57         public static void RemoveWindowsHook(this Window window, HwndSourceHook wmHandler)
  58         {
  59             IntPtr hwnd = new WindowInteropHelper(window).Handle;
  60             HwndSource source = HwndSource.FromHwnd(hwnd);
  61             source.RemoveHook(wmHandler);
  62         }
  63
  64         public static void HideIcon(this Window window)
  65         {
  66             IntPtr hwnd = new WindowInteropHelper(window).Handle;
  67             IntPtr exStyle = Win32Interop.GetWindowLongPtr(hwnd, Win32Interop.GWL_EXSTYLE);
  68             if (IntPtr.Size == 4)
  69             {
  70                 exStyle = new IntPtr(exStyle.ToInt32() | Win32Interop.WS_EX_DLGMODALFRAME);
  71             }
  72             else
  73             {
  74                 exStyle = new IntPtr(exStyle.ToInt64() | ((long)Win32Interop.WS_EX_DLGMODALFRAME));
  75             }
  76             Win32Interop.SetWindowLongPtr(new HandleRef(window, hwnd), Win32Interop.GWL_EXSTYLE, exStyle);
  77
  78             Win32Interop.SendMessage(hwnd, Win32Interop.WM_SETICON, new IntPtr(Win32Interop.ICON_SMALL), IntPtr.Zero);
  79             Win32Interop.SendMessage(hwnd, Win32Interop.WM_SETICON, new IntPtr(Win32Interop.ICON_BIG), IntPtr.Zero);
  80         }
  81
  82         private static long SetBit(long mask, long value, bool flag)
  83         {
  84             if (flag)
  85             {
  86                 return value | mask;
  87             }
  88             else
  89             {
  90                 return value & ~mask;
  91             }
  92         }
  93
  94         private static int SetBit(int mask, int value, bool flag)
  95         {
  96             if (flag)
  97             {
  98                 return value | mask;
  99             }
 100             else
 101             {
 102                 return value & ~mask;
 103             }
 104         }
 105     }
 106 }