BlackBerry iterate through selectedItems list - blackberry-cascades

Question

So I have FINALLY gotten to the point where I can select multiple items on a ListView:
ListView {
id: lv_stuffs
horizontalAlignment: HorizontalAlignment.Fill
dataModel: _app.personDataModel //REFERENCE 1
multiSelectAction: MultiSelectActionItem {
}
multiSelectHandler {
actions: [
// Add the actions that should appear on the context menu
// when multiple selection mode is enabled
ActionItem {
title: "Search for stuffs"
onTriggered: {
_app.search(lv_stuffs.selectionList());
}
...
And I am sending this selection list through to my search method:
void ApplicationUI::search(const QVariantList &list)
{
alert(QString("%1 items selected").arg(list.length()));
alert(((Person)list.at(0)).firstName);//<---- THIS IS THE PROBLEM
}
I am trying to get the "Person" object out of the GroupedDataModel that originally bound to the item... and I have to say I am more than a little stumped. The person is being added to the personDataModel via a simple insert method in a database class:
personDataModel->insert(person);
and the items are then bound to the ListView in the QML (REFERENCE 1 above). The binding is all fine and the items are visible in the list. What I can't figure out is how to now extract these "Person" objects out of the QVariantList I am sent via the MultiSelectionMethod.
My person class:
Person::Person(QObject *parent) : QObject(parent){}
Person::Person(const QString &id, const QString &firstname, const QString &lastname, QObject *parent)
: QObject(parent)
, m_id(id)
, m_firstName(firstname)
, m_lastName(lastname)
{
}
QString Person::customerID() const
{
return m_id;
}
QString Person::firstName() const
{
return m_firstName;
}
QString Person::lastName() const
{
return m_lastName;
}
void Person::setCustomerID(const QString &newId)
{
if (newId != m_id) {
m_id = newId;
emit customerIDChanged(newId);
}
}
void Person::setFirstName(const QString &newName)
{
if (newName != m_firstName) {
m_firstName = newName;
emit firstNameChanged(newName);
}
}
void Person::setLastName(const QString &newName)
{
if (newName != m_lastName) {
m_lastName = newName;
emit lastNameChanged(newName);
}
}
I have been PAINFULLY following this tutorial here, https://developer.blackberry.com/cascades/documentation/ui/lists/list_view_selection.html, which conveniently stops right where my question begins.

Answer 1

Are you perhaps looking for the value function?
void ApplicationUI::search(const QVariantList &list)
{
alert(QString("%1 items selected").arg(list.length()));
alert(((Person)list.value(0)).firstName);
}
(syntax of the extraction of the firstName value may not be right there, depends on your implementation)

Answer 2

Your Person class will be stored in a QVariant. To accomplish this, Qt has to generate some code specific to your class. It can be done by adding this right after your class definition, in the header file for example: Q_DECLARE_METATYPE(Person). You can read more about this here: http://qt-project.org/doc/qt-4.8/qmetatype.html#Q_DECLARE_METATYPE
Now, to extract the value as a Person object, you can use QVariant::value<T>() (http://qt-project.org/doc/qt-4.8/qvariant.html#value):
alert(list.at(0).value<Person>().firstName());