XtSetKeyboardFocus(Xt) X Version 11 (Release 5) XtSetKeyboardFocus(Xt)
6 January 1993
Name
XtSetKeyboardFocus - focus events on a child widget
Syntax
XtSetKeyboardFocus(subtree, descendant)
Widget subtree, descendant;
Arguments
descendant
Specifies either the widget in the subtree structure which is
to receive the keyboard event, or None. Note that it is not an
error to specify None when no input focus was previously set.
w Specifies the widget for which the keyboard focus is to be set.
Description
If a future KeyPress or KeyRelease event occurs within the specified
subtree, XtSetKeyboardFocus causes XtDispatchEvent to remap and send the
event to the specified descendant widget.
When there is no modal cascade, keyboard events can occur within a widget
W in one of three ways:
+ W has the X input focus.
+ W has the keyboard focus of one of its ancestors, and the event occurs
within the ancestor or one of the ancestor's descendants.
+ No ancestor of W has a descendant within the keyboard focus, and the
pointer is within W.
When there is a modal cascade, a widget W receives keyboard events if an
ancestor of W is in the active subset of the modal cascade and one or
more of the previous conditions is True.
When subtree or one of its descendants acquires the X input focus or the
pointer moves into the subtree such that keyboard events would now be
delivered to subtree, a FocusIn event is generated for the descendant if
FocusNotify events have been selected by the descendant. Similarly, when
W loses the X input focus or the keyboard focus for one of its ancestors,
a FocusOut event is generated for descendant if FocusNotify events have
been selected by the descendant.
See also
XtCallAcceptFocus(Xt)
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface