Controls the automatic redrawing of an object or control after each change to its properties.
Windows CE platforms
In PocketBuilder applications, SetRedraw (false) works
only for the ListBox, DropDownListBox, and TreeView controls. SetRedraw
(true) forces a repaint of all control types. This can
lead to unexpected performance penalties in applications that you
deploy to Pocket PC or Smartphone devices.
Any object except a Menu
objectname.SetRedraw ( boolean )
Integer. Returns 1 if it succeeds and -1 if an error occurs. If boolean is null, SetRedraw returns null.
By default, PocketBuilder redraws a control after each change to properties that affect appearance. Use SetRedraw to turn off redrawing temporarily in order to avoid flicker and reduce redrawing time when you are making several changes to the properties of an object or control. If the window is not visible, SetRedraw fails.
Caution
If you turn redraw off, you must turn it on again. Otherwise,
problems may result. In addition, if redraw is off and you change
the Visible or Enabled property of an object in the window, the
tabbing order may be affected.
This statement turns off redraw for lb_Location:
lb_Location.SetRedraw(FALSE)
If lb_Location is sorted
(lb_Location.Sorted = TRUE),
these statements use SetRedraw to avoid sorting
and redrawing the list of lb_Location until
all the new items have been added:
lb_Location.SetRedraw(FALSE)
lb_Location.AddItem("Atlanta")
lb_Location.AddItem("Boston")
lb_Location.AddItem("Washington")
lb_Location.SetRedraw(TRUE)
