Subj : Need help with cursor managment
To   : borland.public.cpp.borlandcpp
From : Jeff Baker
Date : Wed Jun 23 2004 07:20 pm

I'm trying to get my cursor to change when it's located inside a target
area. The code works with one exception...the cursor changes at incorrect
locations. Does anybody have a guess;

[BEGIN CODE]

RECT tr; // Target rect
RECT os; // Offset rect
RECT wa; // Client window area rect.
POINT loc; // Cursor location
HCURSOR cursor; // Current cursor
HCURSOR arrow;
HCURSOR cross;
PAINTSTRUCT paint_struct;

case WM_CREATE:
   os.left = 100; os.top = 100; os.right = 100; os.bottom = 100;
   arrow = LoadCursor(NULL,IDC_ARROW);
   cross = LoadCursor(NULL,IDC_CROSS);
   break;
case WM_SIZE:
case WM_PAINT:
   {
   HDC hdc = BeginPaint(hwnd,&paint_struct);
   GetClientRect(hwnd,&wa);
   tr.left = wa.left + os.left;
   tr.top = wa.top + os.top;
   tr.right = wa.right - os.right;
   tr.bottom = wa.bottom - os.bottom;
   SetBkMode(hdc,TRANSPARENT);
   CreatePen(PS_SOLID,0,(COLORREF)RGB(0,0,0));
   Rectangle(hdc,tr.left,tr.top,tr.right,tr.bottom);
   }
   break;
case WM_MOUSEMOVE:
   cursor = GetCursor();
   GetCursorPos(&loc);
   loc.x += wa.left;
   loc.y += wa.top;
   if (((loc.x > tr.left) && (loc.x < tr.right)) && ((loc.y > tr.top) &&
(loc.y < tr.bottom)))
      SetCursor(cross);
   else SetCursor(arrow);
   ShowCursor(TRUE);
   break;

[END CODE]

The other thing I'm wondering is if there is a better way to check if the
cursor is in the target rect.

- Jeff

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