QFocusData Class Reference
Maintains the list of widgets which can take focus.
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#include <qfocusdata.h>
List of all member functions.
Public Members
Detailed Description
Maintains the list of widgets which can take focus.
This read-only list always contains at least one widget (the
top-level widget, actually). It provides a simple cursor, which can
be reset to the current focus widget using home(), or moved to its
neighboring widgets using next() and prev(), and a count() of
widgets in the list.
Note that some widgets in the list may not accept focus. Widgets
are added to the list as necessary, but not removed from it. This
lets widgets change focus policy dynamically without disrupting the
focus chain the user sees: When a widget disables and re-enables tab
focus, its position in the focus chain does not change.
When reimplementing QWidget::focusNextPrevChild() to provide special
focus flow, you will usually call QWidget::focusData() to retrieve
the focus data stored at the top-level widget - the focus data for
that hierarchy of widgets.
The cursor may change at any time; this class is not thread-safe.
See also QWidget::focusNextPrevChild(), QWidget::setTabOrder() and QWidget::setFocusPolicy().
Member Function Documentation
int QFocusData::count () const
Returns a count of the number of widgets in the hierarchy which accept focus.
QWidget* QFocusData::focusWidget () const
Returns the widgets in the hierarchy which currently has focus.
QWidget* QFocusData::home ()
Moves the cursor to the focusWidget() and returns that widget.
You must call this before next() or prev() to iterate meaningfully.
QWidget* QFocusData::next ()
Moves the cursor to the right. Note that the focus widgets
are a loop of widgets. If you keep calling next(), it will
loop, without ever returning 0.
QWidget* QFocusData::prev ()
Moves the cursor to the left. Note that the focus widgets
are a loop of widgets. If you keep calling prev(), it will
loop, without ever returning 0.
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