_WScrollP( ) API Library Routine

See Also   Example

Scrolls a portion of the contents of a window left or right and up or down.

Syntax

void _WScrollP(WHANDLE wh, Rect r, int dv, int dh)
WHANDLE wh;            /* Window handle. */
Rect r;                     /* Portion to scroll. */
int dv;                        /* Left or right. */
int dh;                     /* Up or down. */

Remarks

• The r parameter describes the portion of the window to be scrolled.
  
  
• The dv parameter describes the number of pixels to scroll the window left or right. If dv is negative, the window contents scroll to the left. If dv is positive, the window contents scroll to the right.
  
  
• The dh parameter describes the number of pixels to scroll the window up or down. If dh is negative, the window contents scroll up. If dh is positive, the window contents scroll down.

If both dv and dh are 0, _WScrollP( ) clears the characters inside the rectangle.

For more information on how to create an API library and integrate it with Visual FoxPro, see Chapter 28, Accessing the Visual FoxPro API, in the Programmer's Guide.