[英]Use QQmlListProperty to show and modify QList in Qml
再次,嗯,我有一个问题(也许是一个问题),我用qt5中的qt和qml和qtquick 2.0中的qml编写了一个程序,并且我有一个c ++模型qlist,我需要在运行时修改列表,我使用q QQmlListProperty并在qml中显示项目,但是下一个在我添加或删除代码的时候它们不会隐藏和显示:
class ConceptsList: public QObject{
Q_OBJECT
Q_PROPERTY(QQmlListProperty<Concept> concepts READ concepts NOTIFY conceptsChanged)
Q_CLASSINFO("DefaultProperty", "concepts")
public:
ConceptsList(QObject *parent=0);
QQmlListProperty<Concept> concepts();
Q_INVOKABLE static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
Q_INVOKABLE void removeConcept(int index);
Q_INVOKABLE void addConcept(QString m_id,QString description, QString quantity, QString price, QString unit, QString total);
Q_INVOKABLE int countConcepts();
static void clearConcepts(QQmlListProperty<Concept> *property);
static int conceptsSize(QQmlListProperty<Concept> *property);
static Concept *conceptAt(QQmlListProperty<Concept> *property, int index);
signals:
void conceptsChanged();
private:
QList<Concept *> m_concepts;
}
我使用listview和委托,但查看没有问题,但是我的问题是我是否可以使用QQmlListProperty并修改Qlist,或者如果可以的话,我将更改表单以将qlist公开给qml,如果可以的话,或者说如何用C ++实施,我问是因为这种形式的作品很少存在或没有实例。 在qml中,我的代码是下一个:
ConceptsList{
id:cpts
concepts:[
Concept{
m_id:"7"
m_quantity: "3"
m_price: "1"
m_unit:"1"
m_description:"algo"
m_total:"2"
}
]
}
ListView {
id: listConceptsView
objectName: "list"
anchors.fill: parent
anchors.margins: 5
clip: true
focus: true
highlight: highlightBar
highlightFollowsCurrentItem: false
Component{
id: tableConceptDelegate
Item{
anchors.margins: 4
width: 515
height: 27
clip: true
Row {
spacing: 4
Text {
height: 26; width: 76
text: model.m_id
color: "black"
font.bold: true
horizontalAlignment: Text.AlignHCenter
}
...
...
Text {
height: 26; width: 120
text: model.m_total//amountTotal
color: "black"
font.bold: true
horizontalAlignment: Text.AlignHCenter
}
}
MouseArea {
id: mouse_area1
anchors.fill: parent
onClicked:
{
listConceptsView.currentIndex = index
}
}
}
}
delegate: tableConceptDelegate
model:cptCpt // i define this alias how cptCpt: cpt.concepts
}
我得到了自己的答案,首先,我停止在方法append_concept中使用属性Q_INVOCABLE,其次,在addConcept的实现中添加了一行代码。 这是代码:
之前:
Q_INVOKABLE static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
现在:
static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
也许这不影响,但我宁愿不冒险。
在addConcept
和removeConcept
的实现中:
void ConceptsList::addConcept(QString m_id, QString quantity, QString price, QString unit, QString description)
{
Concept *cpt=new Concept(m_id, quantity, unit, price, description);
m_concepts.append(cpt);
this->conceptsChanged();
}
void ConceptsList::removeConcept(int index)
{
m_concepts.removeAt(index);
this->conceptsChanged();
}
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