再次,我有一个问题(也许是一个问题),我在qt5中使用qt和qml制作一个程序,并使用qtquick 2.0制作qml,我有一个C++模型qlist,我需要在运行时修改列表,我使用q QQmlListProperty 并显示 qml 中的项目,但当我接下来添加或删除代码时,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;
}
我使用列表视图和委托,查看时没有问题,但我的问题是我是否可以使用 QQmlListProperty 并修改 Qlist,或者我将更改表单以将 qlist 公开给 qml,如果可能的话如何从 qml 调用该方法,或者如何在 C++ 中实现,我问,因为这种形式的工作数量或示例确实很少。
在 qml 中我的代码如下:
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
}
我自己得到了答案,首先,我在append_concept方法中停止使用属性Q_INVOCABLE,其次,我在addConcept的实现中添加了一行代码。这是代码:
Before:
Q_INVOKABLE static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
Now:
static void append_concept(QQmlListProperty<Concept> *list, Concept *cpt);
也许这不会影响,但我宁愿不冒险。
并且在实施中addConcept
and removeConcept
:
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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