Restrict Mouse Movement to a Specific Region
You’d like to be able to restrict mouse-cursor movement to certain areas of the current form. You think it would help users of your application if the mouse stays where it needs to be until they’re done with it. How can you limit mouse movement in Access?
The Windows API’s ClipCursor subroutine will limit the movement of the mouse to a single form or region on a form, as you’ll see in this solution.
To try out this technique, load and run the frmClip form from
11-04.MDB. This form, shown in Figure 11-5, limits the mouse movement to the area of the
form once you click the large button. If you click the button again
or close the form, code attached to either event frees the mouse
cursor to move anywhere on the screen. If you move the form, Windows
frees the mouse cursor for you.
Figure 11-5. frmClip limits mouse movement to the area of the form
To use this technique in your own applications, follow these steps:
Import the module basClipCursor from
11-04.MDB. This module contains the function declarations and user-defined types that you’ll need.
To limit the mouse to a single form, you’ll need to get the form coordinates and tell Windows to use those coordinates as limits for the mouse. To do this, you’ll need code something like the following (because this code fragment uses
Me, it must be in a form’s module, not a global module): ...