I hope these functions might help somebody. Sometimes you want to
know the index of the selected item, or you might want to select the
n-th item in the list.
These functions work well with combobox and treeview. They _should_
work with listview, too, since it uses a SelectionManager, but I have
not tested it.
/**
* Gets the selected index for a combobox or treeview
* returns -1 if nothing is selected.
*/
function getSelectedIndex (xwidget)
{
var mgr = xwidget.getManager();
if (mgr.getSelectedItem() == null)
{
return -1;
}
var items = mgr.getItems();
var i;
for (i = 0; i < items.length; i++)
{
if (items[i] == mgr.getSelectedItem())
{
return i;
}
}
return -1;
}
/**
* Gets the selected item by index for a combobox or treeview
* You can pass "-1" to deselect all items, and if you pass an
* index that is larger than the number of items (minus 1), the
* last item will be selected.
*/
function setSelectedIndex (xwidget, idx)
{
var mgr = xwidget.getManager();
if (idx < 0)
{
mgr.setSelectedItem (null);
return;
}
var items = mgr.getItems();
if (items.length == 0)
{
mgr.setSelectedItem (null);
return;
}
var selitem = null;
if (idx > items.length - 1)
{
idx = items.length - 1;
}
selitem = items[idx];
mgr.setSelectedItem (selitem);
// we need to set the value of a QxComboBox explicitly to change
// the value that is displayed.
if (xwidget.setValue != null)
{
xwidget.setValue(selitem.getLabel());
}
}
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