source: vbox/trunk/src/libs/xpcom18a4/xpcom/tests/windows/TestHelloXPLoop.cpp@ 86714

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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#include "nsIServiceManager.h"
#include "nsCOMPtr.h"
#include "nsCNativeApp.h"
#include "nsIEventLoop.h"
#include <windows.h>

static NS_DEFINE_CID(kNativeAppCID, NS_NATIVE_APP_CID);

LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam);

void ErrorBox(LPSTR text)
{
        MessageBox(NULL, text, "XP Event Loop", MB_OK | MB_ICONSTOP);
}

void InfoBox(LPSTR text)
{
        MessageBox(NULL, text, "XP Event Loop", MB_OK | MB_ICONINFORMATION);
}

int WINAPI WinMain(HINSTANCE inst, 
                   HINSTANCE prevInstance, 
                   LPSTR lpszCmdLine,
                   int nShowCmd)
{
        char* lpszAppName = "HelloWorld";
        HWND wnd;
        WNDCLASSEX wndclass;
        int retCode;

    {   //  Needed to scope all nsCOMPtr within XPCOM Init and Shutdown
      nsresult rv;
      nsCOMPtr<nsIServiceManager> servMan;
      rv = NS_InitXPCOM2(getter_AddRefs(servMan), nsnull, nsnull);
      if(NS_FAILED(rv))
      {
        ErrorBox("Failed to initalize xpcom.");
        return -1;
      }
      
      nsCOMPtr<nsIComponentRegistrar> registrar = do_QueryInterface(servMan);
      NS_ASSERTION(registrar, "Null nsIComponentRegistrar");
      registrar->AutoRegister(nsnull);
      
      nsCOMPtr<nsINativeApp> nativeAppService(do_GetService(kNativeAppCID, &rv));

      if(NS_FAILED(rv))
      {
        ErrorBox("Failed to get nativeAppService");
        return -1;
      }
      wndclass.cbSize        = sizeof(wndclass);
      wndclass.style         = CS_HREDRAW | CS_VREDRAW;
      wndclass.lpfnWndProc   = WndProc;
      wndclass.cbClsExtra    = 0;
      wndclass.cbWndExtra    = 0;
      wndclass.hInstance     = inst;
      wndclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
      wndclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
      wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
      wndclass.lpszMenuName  = NULL;
      wndclass.lpszClassName = lpszAppName;
      wndclass.hIconSm       = LoadIcon(NULL, IDI_APPLICATION);

      RegisterClassEx(&wndclass) ;
      
      wnd = CreateWindow(lpszAppName, "The Hello World",
                         WS_OVERLAPPEDWINDOW,
                         CW_USEDEFAULT, CW_USEDEFAULT,
                         CW_USEDEFAULT, CW_USEDEFAULT,
                         NULL, NULL, inst, NULL);                    
      
      ShowWindow(wnd, nShowCmd);
      UpdateWindow(wnd);
      
      nsCOMPtr<nsIEventLoop> eventLoop;
      
      if(NS_FAILED(nativeAppService->CreateEventLoop(L"_MainLoop", 
                                                     nsEventLoopTypes::MainAppLoop, getter_AddRefs(eventLoop))))
        {
          ErrorBox("Failed to create event Loop");
          return 0;
        } 
      
      eventLoop->Run(nsnull, nsnull, nsnull, &retCode);
      eventLoop = nsnull; // Clear out before Shutting down XPCOM
      
      InfoBox("Hello World app is out of loop");
    }
        NS_ShutdownXPCOM(nsnull);
        InfoBox("Hello World app is exiting");
        return retCode;
}

LRESULT CALLBACK WndProc(HWND wnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
        HDC         hdc;
        PAINTSTRUCT ps;
        RECT        rect;

        switch(msg)
                {
                case WM_PAINT:
                        hdc = BeginPaint(wnd, &ps);

                        GetClientRect(wnd, &rect);

                        DrawText(hdc, "Hello, XP Event Loop!", -1, &rect,
                                         DT_SINGLELINE | DT_CENTER | DT_VCENTER);

                        EndPaint(wnd, &ps);
                        return 0;

                case WM_DESTROY:
                        {
                        nsresult rv;
                        nsCOMPtr<nsINativeApp> nativeAppService = 
                                 do_GetService(kNativeAppCID, &rv);
                        if(NS_FAILED(rv))
                                {
                                ErrorBox("Could not get NativeAppService");
                                return 0;
                                }
                        nsCOMPtr<nsIEventLoop> eventLoop;

                        if(NS_FAILED(nativeAppService->FindEventLoop(L"_MainLoop", 
                                getter_AddRefs(eventLoop))))
                                {
                                ErrorBox("Failed to find event Loop");
                                return 0;
                                }
                        eventLoop->Exit(0);
                        }
                        return 0;
                }

        return DefWindowProc(wnd, msg, wParam, lParam);
}