#include <windows.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
	
	HWND		hwnd;
	MSG		msg;
	WNDCLASS	wndclass;
	static char	*szAppName = "Splitter Example";


	wndclass.style		= 0; //CS_HREDRAW | CS_VREDRAW;
	wndclass.lpfnWndProc	= WndProc;
	wndclass.cbClsExtra	= 0;
	wndclass.cbWndExtra	= 0;
	wndclass.hInstance	= hInstance;
	wndclass.hIcon		= LoadIcon(NULL, IDI_INFORMATION);
	wndclass.hCursor	= LoadCursor(NULL, IDC_ARROW);
	wndclass.hbrBackground	= (HBRUSH)GetStockObject(LTGRAY_BRUSH);
	wndclass.lpszMenuName	= NULL;
	wndclass.lpszClassName	= szAppName;

	RegisterClass(&wndclass);

	hwnd = CreateWindow(szAppName, szAppName,  
				WS_OVERLAPPEDWINDOW | WS_CLIPCHILDREN, 
				CW_USEDEFAULT, CW_USEDEFAULT, 
				400, 300, 
				NULL, NULL,
				hInstance, NULL);

	ShowWindow(hwnd, iCmdShow);
	UpdateWindow(hwnd);

	
	while(GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
	return msg.wParam;
}




LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HINSTANCE	hInst;
	RECT		rect;
	static HCURSOR 	hCursor;
	static BOOL	bSplitterMoving;
	static DWORD	dwSplitterPos;
	static HWND	hWnd1, hWnd2;
	

	switch (uMsg)
	{
	case WM_CREATE:
		hInst = ((LPCREATESTRUCT) lParam) -> hInstance;

		hWnd1 = CreateWindowEx( WS_EX_CLIENTEDGE,
					"edit", NULL,  
					WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | ES_MULTILINE | WS_VSCROLL, 
					0, 0, 0, 0, 
					hWnd, (HMENU) 1,
					hInst, NULL );

		hWnd2 = CreateWindowEx( WS_EX_CLIENTEDGE,
					"edit", NULL,  
					WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | ES_MULTILINE | WS_VSCROLL, 
					0, 0, 0, 0, 
					hWnd, (HMENU) 2,
					hInst, NULL );

		
		hCursor = LoadCursor(NULL, MAKEINTRESOURCE(IDC_SIZENS));
		bSplitterMoving = FALSE;

		dwSplitterPos = 130;
		return 0;


	case WM_SIZE:
		/* 
		   If window is shrunk so that splitter now lies outside the 
		   window boundaries, move the splitter within the window.
		*/
		if ((wParam != SIZE_MINIMIZED) && (HIWORD(lParam) < dwSplitterPos))
			dwSplitterPos = HIWORD(lParam) - 10;

		/* Adjust the children's size and position */
		MoveWindow(hWnd1, 0, 0, LOWORD(lParam), dwSplitterPos - 1, TRUE);
		MoveWindow(hWnd2, 0, dwSplitterPos+2, LOWORD(lParam) , HIWORD(lParam) - dwSplitterPos - 2, TRUE);
		return 0;


	case WM_MOUSEMOVE:
		if (HIWORD(lParam) > 10) // do not allow above this mark
		{
			SetCursor(hCursor);
			if ((wParam == MK_LBUTTON) && bSplitterMoving)
			{
				GetClientRect(hWnd, &rect);
				if (HIWORD(lParam) > rect.bottom)
					return 0;

				dwSplitterPos = HIWORD(lParam);
				SendMessage(hWnd, WM_SIZE, 0, MAKELPARAM(rect.right, rect.bottom));
			}
		}
		return 0;


	case WM_LBUTTONDOWN:
		SetCursor(hCursor);
		bSplitterMoving = TRUE;
		SetCapture(hWnd);
		return 0;


	case WM_LBUTTONUP:
		ReleaseCapture();
		bSplitterMoving = FALSE;
		return 0;


	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;

	}
	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}