doc/html/qfocusdata.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qfocusdata.cpp:40 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>QFocusData Class</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>

<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
 <a href="index.html">
<font color="#004faf">Home</font></a>
 | <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
 | <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
 | <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
 | <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
 | <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QFocusData Class Reference</h1>

<p>The QFocusData class maintains the list of widgets in the focus
chain.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qfocusdata-h.html">qfocusdata.h</a>&gt;</tt>
<p><a href="qfocusdata-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>QWidget * <a href="#focusWidget"><b>focusWidget</b></a> () const</li>
<li class=fn>QWidget * <a href="#home"><b>home</b></a> ()</li>
<li class=fn>QWidget * <a href="#next"><b>next</b></a> ()</li>
<li class=fn>QWidget * <a href="#prev"><b>prev</b></a> ()</li>
<li class=fn>QWidget * <a href="#first"><b>first</b></a> () const</li>
<li class=fn>QWidget * <a href="#last"><b>last</b></a> () const</li>
<li class=fn>int <a href="#count"><b>count</b></a> () const</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


The QFocusData class maintains the list of widgets in the focus
chain.
<p> 
<p> This read-only list always contains at least one widget (i.e. the
top-level widget). It provides a simple cursor which can be reset
to the current focus widget using <a href="#home">home</a>(), or moved to its
neighboring widgets using <a href="#next">next</a>() and <a href="#prev">prev</a>(). You can also retrieve
the <a href="#count">count</a>() of the number of widgets in the list. The list is a
loop, so if you keep iterating, for example using next(), you will
never come to the end.
<p> 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 experiences. When a widget disables and
re-enables tab focus, its position in the focus chain does not
change.
<p> When reimplementing <a href="qwidget.html#focusNextPrevChild">QWidget::focusNextPrevChild</a>() to provide
special focus flow, you will usually call <a href="qwidget.html#focusData">QWidget::focusData</a>() to
retrieve the focus data stored at the top-level widget. A
top-level widget's focus data contains the focus list for its
hierarchy of widgets.
<p> The cursor may change at any time.
<p> This class is <em>not</em> thread-safe.
<p> <p>See also <a href="qwidget.html#focusNextPrevChild">QWidget::focusNextPrevChild</a>(), <a href="qwidget.html#setTabOrder">QWidget::setTabOrder</a>(), <a href="qwidget.html#focusPolicy-prop">QWidget::focusPolicy</a>, and <a href="misc.html">Miscellaneous Classes</a>.

<hr><h2>Member Function Documentation</h2>
<h3 class=fn>int <a name="count"></a>QFocusData::count () const
</h3>

<p> Returns the number of widgets in the focus chain.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="first"></a>QFocusData::first () const
</h3>
Returns the first widget in the focus chain.
The cursor is not modified.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="focusWidget"></a>QFocusData::focusWidget () const
</h3>

<p> Returns the widgets in the hierarchy that are in the focus chain.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="home"></a>QFocusData::home ()
</h3>
Moves the cursor to the <a href="#focusWidget">focusWidget</a>() and returns that widget. You
must call this before <a href="#next">next</a>() or <a href="#prev">prev</a>() to iterate meaningfully.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="last"></a>QFocusData::last () const
</h3>
Returns the last widget in the focus chain.
The cursor is not modified.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="next"></a>QFocusData::next ()
</h3>
Moves the cursor to the next widget in the focus chain. There is
<em>always</em> a next widget because the list is a loop.

<h3 class=fn><a href="qwidget.html">QWidget</a>&nbsp;* <a name="prev"></a>QFocusData::prev ()
</h3>
Moves the cursor to the previous widget in the focus chain. There
is <em>always</em> a previous widget because the list is a loop.

<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">Qt toolkit</a>.
Copyright &copy; 1995-2007
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>Qt 3.3.8</div>
</table></div></address></body>
</html>