win8/metro_driver/metro_driver_win7.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "stdafx.h"
   6
   7 EXTERN_C IMAGE_DOS_HEADER __ImageBase;
   8
   9 struct Globals {
  10   LPTHREAD_START_ROUTINE host_main;
  11   void* host_context;
  12   HWND core_window;
  13   HWND host_window;
  14   HANDLE host_thread;
  15   DWORD main_thread_id;
  16 } globals;
  17
  18
  19 void ODS(const char* str, LONG_PTR val = 0) {
  20   char buf[80];
  21   size_t len = strlen(str);
  22   if (len > 50) {
  23     ::OutputDebugStringA("ODS: buffer too long");
  24     return;
  25   }
  26
  27   if (str[0] == '!') {
  28     // Fatal error.
  29     DWORD gle = ::GetLastError();
  30     if (::IsDebuggerPresent())
  31       __debugbreak();
  32     wsprintfA(buf, "ODS:fatal %s (%p) gle=0x%x", str, val, gle);
  33     ::MessageBoxA(NULL, buf, "!!!", MB_OK);
  34     ::ExitProcess(gle);
  35   } else {
  36     // Just information.
  37     wsprintfA(buf, "ODS:%s (%p)\n", str, val);
  38     ::OutputDebugStringA(buf);
  39   }
  40 }
  41
  42 LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
  43                          WPARAM wparam, LPARAM lparam) {
  44   PAINTSTRUCT ps;
  45   HDC hdc;
  46   switch (message) {
  47     case WM_PAINT:
  48       hdc = BeginPaint(hwnd, &ps);
  49       EndPaint(hwnd, &ps);
  50       break;
  51     case WM_DESTROY:
  52       PostQuitMessage(0);
  53       ODS("Metro WM_DESTROY received");
  54       break;
  55     default:
  56       return DefWindowProc(hwnd, message, wparam, lparam);
  57   }
  58   return 0;
  59 }
  60
  61 HWND CreateMetroTopLevelWindow() {
  62   HINSTANCE hInst = reinterpret_cast<HINSTANCE>(&__ImageBase);
  63   WNDCLASSEXW wcex;
  64   wcex.cbSize = sizeof(wcex);
  65   wcex.style                    = CS_HREDRAW | CS_VREDRAW;
  66         wcex.lpfnWndProc        = WndProc;
  67         wcex.cbClsExtra         = 0;
  68         wcex.cbWndExtra         = 0;
  69         wcex.hInstance          = hInst;
  70         wcex.hIcon              = 0;
  71         wcex.hCursor            = LoadCursor(NULL, IDC_ARROW);
  72         wcex.hbrBackground      = (HBRUSH)(COLOR_INACTIVECAPTION+1);
  73         wcex.lpszMenuName       = 0;
  74         wcex.lpszClassName      = L"Windows.UI.Core.CoreWindow";
  75         wcex.hIconSm            = 0;
  76
  77   HWND hwnd = ::CreateWindowExW(0,
  78                                 MAKEINTATOM(::RegisterClassExW(&wcex)),
  79                                 L"metro_metro",
  80                                 WS_POPUP,
  81                                 0, 0, 0, 0,
  82                                 NULL, NULL, hInst, NULL);
  83   return hwnd;
  84 }
  85
  86 DWORD WINAPI HostThread(void*) {
  87   // The sleeps simulates the delay we have in the actual metro code
  88   // which takes in account the corewindow being created and some other
  89   // unknown machinations of metro.
  90   ODS("Chrome main thread", ::GetCurrentThreadId());
  91   ::Sleep(30);
  92   return globals.host_main(globals.host_context);
  93 }
  94
  95 extern "C" __declspec(dllexport)
  96 int InitMetro(LPTHREAD_START_ROUTINE thread_proc, void* context) {
  97   ODS("InitMetro [Win7 emulation]");
  98   HWND window = CreateMetroTopLevelWindow();
  99   if (!window)
 100     return 1;
 101   // This magic incatation tells windows that the window is going fullscreen
 102   // so the taskbar gets out of the wait automatically.
 103   ::SetWindowPos(window,
 104                  HWND_TOP,
 105                  0,0,
 106                  GetSystemMetrics(SM_CXSCREEN),
 107                  GetSystemMetrics(SM_CYSCREEN),
 108                  SWP_SHOWWINDOW);
 109
 110   // Ready to start our caller.
 111   globals.core_window = window;
 112   globals.host_main = thread_proc;
 113   globals.host_context = context;
 114   HANDLE thread = ::CreateThread(NULL, 0, &HostThread, NULL, 0, NULL);
 115
 116   // Main message loop.
 117   MSG msg = {0};
 118   while (GetMessage(&msg, NULL, 0, 0)) {
 119     TranslateMessage(&msg);
 120     DispatchMessage(&msg);
 121   }
 122
 123   return (int) msg.wParam;
 124 }
 125
 126 extern "C" _declspec(dllexport) HWND GetRootWindow() {
 127   ODS("GetRootWindow", ULONG_PTR(globals.core_window));
 128   return globals.core_window;
 129 }
 130
 131 extern "C" _declspec(dllexport) void SetFrameWindow(HWND window) {
 132   ODS("SetFrameWindow", ULONG_PTR(window));
 133   globals.host_window = window;
 134 }
 135
 136 extern "C" __declspec(dllexport) const wchar_t* GetInitialUrl() {
 137   return L"";
 138 }
 139