windows-nt-4.0/private/windows/win4help/compiler/hcrtf/grind.cpp

#include "stdafx.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static int iGrind;
HBITMAP hbmpGrind;
const int BMP_WIDTH  = 32;
const int BMP_HEIGHT = 32;
const int C_GRIND_IMAGES = 8 - 1;
HDC   hdcMem, hdcWnd;
HBITMAP hbmpPreSelect;
static int lPad;
static int tPad;

// This is the milliseconds we sleep before updating the grinder.

const int GRIND_SLEEP = 500;

static const char txtGrindClassName[] = "GrindClass";

LRESULT STDCALL GrindWndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);
static DWORD STDCALL GetTextDimensions(HWND hwnd, PCSTR psz);
static DWORD WINAPI GrindThread(LPVOID pv);

static BOOL fStopGrinding;
static HANDLE hthrd;
static DWORD idThrd;
static BOOL fRegistered;
static PCSTR pszGrindTitle;
static HANDLE hMainThrd;

/***************************************************************************

	FUNCTION:	InitGrind

	PURPOSE:	Initialize the grinder window

	PARAMETERS:
		void

	RETURNS:

	COMMENTS:

	MODIFICATION DATES:
		11-Oct-1993 [ralphw]

***************************************************************************/

BOOL STDCALL InitGrind(PCSTR pszTitle)
{
	if (iflags.fNoGrinder)
		return TRUE;
	pszGrindTitle = pszTitle;

	DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
		GetCurrentProcess(), &hMainThrd, NULL, FALSE, DUPLICATE_SAME_ACCESS);

	HANDLE hthrd = CreateThread(NULL, 0,
		(LPTHREAD_START_ROUTINE) &GrindThread, NULL,
		0, &idThrd);

	if (hthrd)
		SetThreadPriority(hthrd, THREAD_PRIORITY_HIGHEST);

	return (BOOL) hthrd;
}

static DWORD WINAPI GrindThread(LPVOID pv)
{
	/*
	 * With small projects on a fast machine, we'll be done before
	 * half a second is up, so before we bother creating our window,
	 * we just sleep for awhile and then wake up and see if we really
	 * need to do anything.
	 */

	Sleep(500);
	if (fStopGrinding) {
		ExitThread(0);
		hthrd = NULL;
		return 0;
	}

	hbmpGrind = LoadBitmap(hinstApp, MAKEINTRESOURCE(IDBMP_GRIND));
	ASSERT(hbmpGrind);

	hdcMem = CreateCompatibleDC(NULL);
	if (!hdcMem) {
		ExitThread(0);
		hthrd = NULL;
		return 0;
	}

	if (!fRegistered) {
		WNDCLASS  wc;
		memset(&wc, 0, sizeof(wc));

		// Register Main window class

		wc.hInstance = hinstApp;
		wc.style = CS_BYTEALIGNWINDOW | CS_CLASSDC;
		wc.lpfnWndProc = GrindWndProc;
		wc.lpszClassName = txtGrindClassName;
		wc.hIcon = LoadIcon(hinstApp, MAKEINTRESOURCE(IDI_HCRTF));
		wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);

		if (!RegisterClass(&wc)) {
			ExitThread(0);
			hthrd = NULL;
			return 0;
		}
		fRegistered = TRUE;
	}

	RECT rc;
	GetWindowRect(hwndParent ? hwndParent : GetDesktopWindow(), &rc);

	PCSTR pszWindowTitle = (pszGrindTitle ?
		pszGrindTitle : GetStringResource(IDS_GRINDER_TITLE));

	int width = LOWORD(GetTextDimensions(NULL, pszWindowTitle)) +
		GetSystemMetrics(SM_CXSIZE) * 2;

	hwndGrind = CreateWindowEx(WS_EX_WINDOWEDGE, txtGrindClassName,
		pszWindowTitle,
		WS_SYSMENU | WS_CAPTION | WS_DLGFRAME,
		rc.left + RECT_WIDTH(rc) / 2 - width / 2,
		rc.top + RECT_HEIGHT(rc) / 2 - BMP_HEIGHT / 2,
		width + GetSystemMetrics(SM_CXDLGFRAME) * 2 + 2,
		BMP_HEIGHT + GetSystemMetrics(SM_CYDLGFRAME) * 2 + 6 +
			GetSystemMetrics(SM_CYMENU),
			hwndParent, NULL,
		hinstApp, NULL);
	lPad = width / 2 - GetSystemMetrics(SM_CXDLGFRAME) - 1;
	tPad = 3;

	if (!hwndGrind) {
		ExitThread(0);
		hthrd = NULL;
		return 0;
	}

	HWDLL_INIT hwInit;
	hwInit.cb = sizeof(HWDLL_INIT);
	hwInit.hinstApp = hinstApp;
	hwInit.pszErrorFile = "c:\\hcrtf.err";
	hwInit.hwndWindow = hwndGrind;
	hwInit.CopyAssertInfo = NULL;
	hwInit.pszMsgBoxTitle = pgszTitleBuf;
	hwInit.version = 0; // at this point, we don't care about a version match
	InitializeHwDll(&hwInit);

	hbmpPreSelect = (HBITMAP) SelectObject(hdcMem, hbmpGrind);
	ASSERT(hbmpPreSelect);

	ShowWindow(hwndGrind, SW_NORMAL);
	if (hwndParent)
		SendMessage(hwndParent, WMP_HWND_GRINDER, (WPARAM) hwndGrind, 0);

	// This is a class DC, and therefore does not have to be released

	hdcWnd = GetDC(hwndGrind);

	while (!fStopGrinding) {
		BitBlt(hdcWnd, lPad, tPad, BMP_WIDTH, BMP_HEIGHT, hdcMem,
			iGrind * BMP_WIDTH, 0, SRCCOPY);
		if (++iGrind > C_GRIND_IMAGES)
			iGrind = 0;
		FlushMessageQueue();

		// This isn't necesary under Windows 95 or NT 4.0

		GdiFlush();

		Sleep(GRIND_SLEEP);
	}

	if (hbmpPreSelect && hdcMem)
		SelectObject(hdcMem, hbmpPreSelect);

	if (hdcMem) {
		DeleteDC(hdcMem);
		hdcMem = NULL;
	}

	RemoveGdiObject(&hbmpGrind);
	if (hwndGrind) {
		DestroyWindow(hwndGrind);
		hwndGrind = NULL;
		FlushMessageQueue();
	}

	// Tell our parent that they no longer have a valid window handle

	if (hwndParent)
		SendMessage(hwndParent, WMP_HWND_GRINDER, (WPARAM) (HWND) 0, 0);

	ExitThread(0);
	hthrd = NULL;
	return 0;
}

void STDCALL FlushMessageQueue(void)
{
	MSG msg;

	while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
}

LRESULT STDCALL GrindWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch (msg) {
		case WM_KEYUP:
			if (wParam != VK_ESCAPE)
				return 0;

		// deliberately fall through

		case WM_CLOSE:
		case WMP_STOP_GRINDING:
			{
				CStr csz(IDS_TITLE);
				if (MessageBox(hwnd, GetStringResource(IDS_CONFIRM_ABORT),
						csz, MB_YESNO) == IDNO)
					return 0;
			}
			RemoveGrind();
			if (hwndParent)
				PostMessage(hwndParent, WMP_STOP_COMPILING, 0, 0);

			fStopCompiling = TRUE;
			return 0;

		case WM_DESTROY:
			if (hbmpGrind) {
				/*
				 * Set hwndGrind to NULL so that RemoveGrind() won't call
				 * DestroyWindow().
				 */

				hwndGrind = NULL;
				RemoveGrind();
				SendStringToParent(GetStringResource(IDS_USER_ABORTING));
				fStopCompiling = TRUE;
			}
			return 0;

		case WM_TCARD:
			fCntJump = (int) wParam;
			return 0;

		case WMP_NO_ACTIVATE:
			fNoActivation = TRUE;
			return 0;

		default:
			return DefWindowProc(hwnd, msg, wParam, lParam);
	}
}

/***************************************************************************

	FUNCTION:	 GetTextDimensions

	PURPOSE:	Get the width/height of the button

	PARAMETERS:
	hwnd
	psz

	RETURNS:

	COMMENTS:

	MODIFICATION DATES:
	04-Feb-1993 [ralphw]

***************************************************************************/

static DWORD STDCALL GetTextDimensions(HWND hwnd, PCSTR psz)
{
	HDC hdc = GetDC(hwnd);

	if (hdc == NULL)
		return 0L;

	SIZE size;
	GetTextExtentPoint(hdc, psz, strlen(psz), &size);
	ReleaseDC(hwnd, hdc);

	return MAKELONG(size.cx, size.cy);
}

void STDCALL RemoveGrind(void)
{
	fStopGrinding = TRUE;

	// Tell our parent that they no longer have a valid window handle

	if (hwndParent)
		SendMessage(hwndParent, WMP_HWND_GRINDER, (WPARAM) (HWND) 0, 0);
	return;
}