我在QML中刷新Listview时遇到问题，我通过许多解决方案进行了查看，但是我没有从事件“ onClicked”刷新所有listview的具体内容，但是该怎么做呢？
源代码：http ://s000.tinyupload.com/?file_id= 86538244635919176055
main.cpp
#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <QDebug>
#include "message.h"
#include "dataobject.h"
int main(int argc, char *argv[]) {
QList<QObject*> dataList;
dataList.append(new DataObject("1"));
dataList.append(new DataObject("2"));
dataList.append(new DataObject("3"));
QApplication app(argc, argv);
QQmlApplicationEngine engine;
Message msg;
msg.setListInstance(&dataList);
auto root_context = engine.rootContext();
root_context->setContextProperty("message",&msg);
//root_context->setContextProperty("myModel", QVariant::fromValue(dataList));
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
QQmlContext *ctxt = new QQmlContext(engine.rootContext());
//ctxt->setContextProperty("myModel", QVariant::fromValue(dataList));
return app.exec();
}
message.h
#ifndef MESSAGE_H
#define MESSAGE_H
#include <QQmlListProperty>
#include <QObject>
class Message : public QObject {
Q_OBJECT
Q_PROPERTY(QQmlListProperty<QObject> myModel READ getList NOTIFY listChanged)
public:
explicit Message(QObject *parent = 0);
~Message();
void setListInstance(QList<QObject *> *dataList){ list = dataList; }
QQmlListProperty<QObject> myModel() const;
public slots:
void refreshLista();
QQmlListProperty<QObject> getList();
private:
QList<QObject *> *list;
signals:
void listChanged();
};
#endif // MESSAGE_H
message.cpp
#include "message.h"
#include "dataobject.h"
#include <QDebug>
Message::Message(QObject *parent):QObject(parent){}
Message::~Message(){}
void Message::refreshLista(){
list->append(new DataObject("44444"));
emit listChanged();
qDebug() << " REFRESH LISTA ";
}
QQmlListProperty<QObject> Message::getList(){
return QQmlListProperty<QObject>(this, *list);
}
数据对象
#ifndef DATAOBJECT_H
#define DATAOBJECT_H
#include <QObject>
class DataObject : public QObject { Q_OBJECT
Q_PROPERTY( QString title READ title WRITE setTitle NOTIFY info)
public:
DataObject(QObject * parent = 0 );
DataObject(const QString &_title,QObject * parent=0 );
QString title() const;
void setTitle(const QString &);
signals:
void info();
private:
QString m_id;
QString m_title;
};
#endif // DATAOBJECT_H
dataobject.cpp
#include "dataobject.h"
DataObject::DataObject(QObject * parent): QObject(parent){}
DataObject::DataObject(const QString &_title,QObject * parent)
:QObject(parent),m_title(_title)
{}
QString DataObject::title() const { return m_title;}
void DataObject::setTitle(const QString &title) {
if ( title != m_title ) { m_title = title; emit info();}
}
有两件事要做：
Message必须修改模型，因此Message需要模型的实例。假设您的Message班级负责该模型。首先，将模型传递给Message。
class Message : public QObject {
//...
private:
QList<QObject *> *list;
public:
void setListInstance(QList<QObject *> *dataList){ list = dataList; }
}
//main.cpp
msg.setListInstance(&dataList);
您现在可以轻松更改模型的内容：
void Message::refreshLista(){ list->append(new DataObject("new")); /*whatever*/}
但是，由于setContextProperty("myModel", QVariant::fromValue(dataList));无法发射信号，QML不会重新加载模型。从main.cpp中删除这一行，并在其中创建一个新属性Message：
class Message : public QObject {
Q_OBJECT
Q_PROPERTY(QQmlListProperty<QObject> myModel READ getList NOTIFY listChanged)
public:
QQmlListProperty<QObject> getList();
signals:
void listChanged();
}
在实现中，创建QQmlListProperty并在必要时发出属性更改的信号。
void Message::refreshLista(){
list->append(new DataObject("new"));
emit listChanged();
}
QQmlListProperty<QObject> Message::getList(){
return QQmlListProperty<QObject>(this, *list);
}
最后，QML中的ListView应该绑定到message.myModel而不是myModel：
ListView {
width: 400; height: 300;
model: message.myModel
//...
}
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