這次加載的數據來自於C++動態庫而不是另一個qml文件。這個比之前的文章復雜。
我的項目目錄樹如下：
/listview2$ tree
.
├── imports
│ └── mylist
│ ├── libmylist.so
│ └── qmldir
├── list2.pro
├── plugin.cpp
├── run.sh
└── test.qml
The list2.pro文件內容如下：
TEMPLATE = lib
CONFIG += plugin
QT += qml
DESTDIR = imports/mylist
TARGET = mylist
SOURCES += plugin.cpp
qml.files = test.qml
qml.path += ./
pluginfiles.files += imports/mylist/qmldir
pluginfiles.path += imports/mylist
target.path += imports/mylist
INSTALLS += target qml pluginfiles
模塊目錄下的qmldir做了修改：
module mylist
plugin mylist
為了方便，我在一個plugin.cpp文件中實現了所有的C++代碼。
#include
#include
#include
#include
#include
#include
#include
#include
class People {
public:
People(QString const & name, QString const & number)
: name_(name), number_(number) {
}
QString name() const {
return name_;
}
QString number() const {
return number_;
}
private:
QString name_;
QString number_;
};
class PeopleListModel : public QAbstractListModel {
Q_OBJECT
public:
enum PeopleRoles {
NameRole = Qt::UserRole + 1,
NumberRole
};
PeopleListModel(QObject * parent = 0)
: QAbstractListModel(parent) {
People p1("Dean", "186***");
addPeople(p1);
People p2("Crystal", "186***");
addPeople(p2);
}
void addPeople(People const & p) {
beginInsertRows(QModelIndex(), rowCount(), rowCount());
values_ << p;
endInsertRows();
}
int rowCount(QModelIndex const & parent = QModelIndex()) const {
return values_.count();
}
QVariant data(QModelIndex const & index, int role = Qt::DisplayRole) const {
if (index.row() < 0 || index.row() >= values_.count())
return QVariant();
People const & p = values_[index.row()];
if (role == NameRole)
return p.name();
else if (role == NumberRole)
return p.number();
return QVariant();
}
protected:
QHash roleNames() const {
QHash roles;
roles[NameRole] = "name";
roles[NumberRole] = "number";
return roles;
}
private:
QList values_;
};
class QExampleQmlPlugin : public QQmlExtensionPlugin {
Q_OBJECT
Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QQmlExtension.PeopleListModel")
public:
void registerTypes(char const * uri) {
qmlRegisterType(uri, 1, 0, "PeopleListModel");
}
};
#include "plugin.moc"
People類很簡單，只包含了兩個屬性: name和number
PeopleListModel類繼承自QAbstractListModel, 它提供了ListView需要的數據。
QExampleQmlPlugin類是plugin類，注冊了PeopleListModel類。
注意PeopleListModel類的三個方法：rowCount, data和roleNames. 它們都是ListView需要的。
要想理解Model-View體系結構，請從下面的文檔開始。
http://doc-snapshot.qt-project.org/qdoc/model-view-programming.html#introduction-to-model-view-programming
