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 home(), or moved to its neighboring widgets using next() and prev(). You can also retrieve the count() 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.
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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.
When reimplementing TQWidget::focusNextPrevChild() to provide special focus flow, you will usually call TQWidget::focusData() 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.
