1QFocusData(3qt) QFocusData(3qt)
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6 QFocusData - Maintains the list of widgets in the focus chain
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9 #include <qfocusdata.h>
10 Public Members
12 QWidget * focusWidget () const
13 QWidget * home ()
14 QWidget * next ()
15 QWidget * prev ()
16 QWidget * first () const
17 QWidget * last () const
18 int count () const
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21 The QFocusData class maintains the list of widgets in the focus chain.
22 This read-only list always contains at least one widget (i.e. the top-
24 level widget). It provides a simple cursor which can be reset to the
25 current focus widget using home(), or moved to its neighboring widgets
26 using next() and prev(). You can also retrieve the count() of the
27 number of widgets in the list. The list is a loop, so if you keep
28 iterating, for example using next(), you will never come to the end.
29 Some widgets in the list may not accept focus. Widgets are added to the
31 list as necessary, but not removed from it. This lets widgets change
32 focus policy dynamically without disrupting the focus chain the user
33 experiences. When a widget disables and re-enables tab focus, its
34 position in the focus chain does not change.
35 When reimplementing QWidget::focusNextPrevChild() to provide special
37 focus flow, you will usually call QWidget::focusData() to retrieve the
38 focus data stored at the top-level widget. A top-level widget's focus
39 data contains the focus list for its hierarchy of widgets.
40 The cursor may change at any time.
42 This class is not thread-safe.
44 See also QWidget::focusNextPrevChild(), QWidget::setTabOrder(),
46 QWidget::focusPolicy, and Miscellaneous Classes.
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50 Returns the number of widgets in the focus chain.
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53 Returns the first widget in the focus chain. The cursor is not
54 modified.
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57 Returns the widgets in the hierarchy that are in the focus chain.
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60 Moves the cursor to the focusWidget() and returns that widget. You must
61 call this before next() or prev() to iterate meaningfully.
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64 Returns the last widget in the focus chain. The cursor is not modified.
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67 Moves the cursor to the next widget in the focus chain. There is always
68 a next widget because the list is a loop.
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71 Moves the cursor to the previous widget in the focus chain. There is
72 always a previous widget because the list is a loop.
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76 http://doc.trolltech.com/qfocusdata.html
77 http://www.trolltech.com/faq/tech.html
78
80 Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
81 license file included in the distribution for a complete license
82 statement.
83
85 Generated automatically from the source code.
86
88 If you find a bug in Qt, please report it as described in
89 http://doc.trolltech.com/bughowto.html. Good bug reports help us to
90 help you. Thank you.
91 The definitive Qt documentation is provided in HTML format; it is
93 located at $QTDIR/doc/html and can be read using Qt Assistant or with a
94 web browser. This man page is provided as a convenience for those users
95 who prefer man pages, although this format is not officially supported
96 by Trolltech.
97 If you find errors in this manual page, please report them to qt-
99 bugs@trolltech.com. Please include the name of the manual page
100 (qfocusdata.3qt) and the Qt version (3.3.8).
101Trolltech AS 2 February 2007 QFocusData(3qt)