base/applications/kbswitch/kbsdll/kbsdll.c

   1 /*
   2  * PROJECT:         ReactOS Keyboard Layout Switcher
   3  * FILE:            base/applications/kbswitch/kbsdll/kbsdll.c
   4  * PROGRAMMER:      Dmitry Chapyshev <dmitry@reactos.org>
   5  *
   6  */
   7
   8 #include "../kbswitch.h"
   9
  10 HHOOK hWinHook = NULL;
  11 HHOOK hShellHook = NULL;
  12 HINSTANCE hInstance = NULL;
  13 HWND hKbSwitchWnd = NULL;
  14
  15 static VOID
  16 PostMessageToMainWnd(UINT Msg, WPARAM wParam, LPARAM lParam)
  17 {
  18     PostMessage(hKbSwitchWnd, Msg, wParam, lParam);
  19 }
  20
  21 LRESULT CALLBACK
  22 WinHookProc(int code, WPARAM wParam, LPARAM lParam)
  23 {
  24     if (code < 0)
  25     {
  26         return CallNextHookEx(hWinHook, code, wParam, lParam);
  27     }
  28
  29     switch (code)
  30     {
  31         case HCBT_SETFOCUS:
  32         {
  33             HWND hwndFocus = (HWND)wParam;
  34             if (hwndFocus && hwndFocus != hKbSwitchWnd)
  35             {
  36                 PostMessageToMainWnd(WM_WINDOW_ACTIVATE, wParam, lParam);
  37             }
  38         }
  39         break;
  40     }
  41
  42     return CallNextHookEx(hWinHook, code, wParam, lParam);
  43 }
  44
  45 LRESULT CALLBACK
  46 ShellHookProc(int code, WPARAM wParam, LPARAM lParam)
  47 {
  48     if (code < 0)
  49     {
  50         return CallNextHookEx(hShellHook, code, wParam, lParam);
  51     }
  52
  53     switch (code)
  54     {
  55         case HSHELL_LANGUAGE:
  56         {
  57             PostMessageToMainWnd(WM_LANG_CHANGED, wParam, lParam);
  58         }
  59         break;
  60     }
  61
  62     return CallNextHookEx(hShellHook, code, wParam, lParam);
  63 }
  64
  65 BOOL WINAPI
  66 KbSwitchSetHooks(VOID)
  67 {
  68     hWinHook = SetWindowsHookEx(WH_CBT, WinHookProc, hInstance, 0);
  69     hShellHook = SetWindowsHookEx(WH_SHELL, ShellHookProc, hInstance, 0);
  70
  71     if (!hWinHook || !hShellHook)
  72     {
  73         return FALSE;
  74     }
  75
  76     return TRUE;
  77 }
  78
  79 VOID WINAPI
  80 KbSwitchDeleteHooks(VOID)
  81 {
  82     if (hWinHook)
  83     {
  84         UnhookWindowsHookEx(hWinHook);
  85         hWinHook = NULL;
  86     }
  87     if (hShellHook)
  88     {
  89         UnhookWindowsHookEx(hShellHook);
  90         hShellHook = NULL;
  91     }
  92 }
  93
  94 BOOL WINAPI
  95 DllMain(IN HINSTANCE hinstDLL,
  96         IN DWORD dwReason,
  97         IN LPVOID lpvReserved)
  98 {
  99     switch (dwReason)
 100     {
 101         case DLL_PROCESS_ATTACH:
 102         {
 103             hInstance = hinstDLL;
 104             hKbSwitchWnd = FindWindow(szKbSwitcherName, NULL);
 105             if (!hKbSwitchWnd)
 106             {
 107                 return FALSE;
 108             }
 109         }
 110         break;
 111     }
 112
 113     return TRUE;
 114 }