x::w::new_standard_comboboxlayoutmanager
inherits
selected()
and size() from the
list layout manager:
size_t s=cbmanager->size(); std::optional<size_t> current_value=cbmanager->selected();
selected() indicates the currently selected
standard combo-box item, if there is one.
combobox.C shows
how to use the alternative option of installing a callback
that gets invoked to report each combo-box selection change.
The combo-box's label shows the most recently selected combo-box
item. It gets sized automatically to be just big enough for the
longest item in the combo-box.
x::w::new_standard_comboboxlayoutmanager's
constructor takes an optional callback parameter.
This callback gets invoked whenever a combo-box item gets
selected or deselected, in addition to updating the combo-box's label.
The callback receives a
x::w::standard_combobox_selection_changed_info_t
parameter.
combobox.C
installs a callback that logs “Selected item #”
whenever it changes.
x::w::new_standard_comboboxlayoutmanager's
selected() method returns the currently
selected combo-box item (if there is one).
x::w::new_standard_comboboxlayoutmanager
calls it before closing its window, to show the final
combo-box selection.