MoveCaret2.cpp

// MoveCaret2.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "MoveCaret2.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst;								// current instance
TCHAR szTitle[MAX_LOADSTRING];					// The title bar text
TCHAR szWindowClass[MAX_LOADSTRING];			// the main window class name

// Forward declarations of functions included in this code module:
ATOM				MyRegisterClass(HINSTANCE hInstance);
BOOL				InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK	About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_MOVECARET2, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

	// Perform application initialization:
	if (!InitInstance (hInstance, nCmdShow))
	{
		return FALSE;
	}

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MOVECARET2));

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0))
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are only necessary if you want this code
//    to be compatible with Win32 systems prior to the 'RegisterClassEx'
//    function that was added to Windows 95. It is important to call this function
//    so that the application will get 'well formed' small icons associated
//    with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
	WNDCLASSEX wcex;

	wcex.cbSize = sizeof(WNDCLASSEX);

	wcex.style			= CS_HREDRAW | CS_VREDRAW;
	wcex.lpfnWndProc	= WndProc;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MOVECARET2));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)(COLOR_WINDOW+1);
	wcex.lpszMenuName	= NULL;//MAKEINTRESOURCE(IDC_MOVECARET2);
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, 180, 100, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;
	static HWND hwndEdit;
	static int editId;
	static bool gaurd = false;

	switch (message)
	{
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		
		if(gaurd)
			break;

		switch(wmEvent)
		{
		// TEXT CHANGE NOTIFICATION
		case EN_CHANGE:
			// Get the text
			TCHAR buff[64];
			SendMessage(hwndEdit, WM_GETTEXT, 32, (LPARAM)buff);
			size_t len = _tcslen(buff);

			// see if the last char is an "h"
			if(len > 0 && buff[len - 1] == 'h')
			{
				// if we have enough room in our buffer, add an "a"
				if ( len <= 62)
				{
					_tcsncat(buff, L"a", 1);

					// save the initial position of the position
					DWORD firstChar, lastChar;
					SendMessage(hwndEdit, EM_GETSEL, (WPARAM) &firstChar, (LPARAM) &lastChar);

					// now set the text, using guard as a mutex to prevent recursing into this handler
					gaurd = true;
					SendMessage(hwndEdit, WM_SETTEXT, NULL, (LPARAM) buff);
					gaurd = false;

					//reset their caret position
					if(firstChar == lastChar && firstChar == len)
					{
						firstChar++;
						lastChar++;
					}

					SendMessage(hwndEdit, EM_SETSEL, (WPARAM) firstChar, (LPARAM) lastChar);
				}
			}
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
		EndPaint(hWnd, &ps);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	case WM_CREATE:
		// create a text box with the usual border
		 hwndEdit = CreateWindowEx(
                                WS_EX_OVERLAPPEDWINDOW, // this makes the textbox receive a border
								L"Edit",   // predefined class 
                                NULL,         // no window title 
                                WS_CHILD | WS_VISIBLE | ES_LEFT | WS_BORDER, 
                                20, 20, 120, 20,   // set size in WM_SIZE message 
                                hWnd,         // parent window 
                                NULL,
                                (HINSTANCE) GetWindowLong(hWnd, GWL_HINSTANCE), 
                                NULL);        
		 editId = GetWindowLong(hwndEdit, GWL_ID);
		// focus the text box
		SetFocus(hwndEdit);
	break;
	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}