[SOLVED] Accessing properties in QML Delegate for imported C++ objects / ListView
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Hello,
I am making a parameter edit screen with QML, QT 5.3. I am importing a C++ map of objects as a Listview model, and it almost works : All rectangles appear, but no text in it.
I get these QML errors. "ReferenceError: prop_name is not defined" "ReferenceError: prop_description is not defined"
It seems the list exist, was constructed correctly with the right number of items, but I cannot access the properties. Probably I am still doing something wrong, but I can't find what, from all information I find online, I think my effort could work, but it does not. I implemented a workaround to get the data from a C++ map into a variant list, and this seems ok, but probably I still made a mistake. I don't see it.I'd appreciate if you experts had a look, and tell me your opinion, how can I make this work ?
Is this the wrong approach ?You can see the code fragments below, ParamScreen.qml is included in
marpgui.qml :@// main initialisation :
QMap<QString, MaQParam *> marpParamMap;
QVariantList marpParamList;MARPGUI::MARPGUI(JSONRPCUDP* param_jsonrpcserver)
{
MARP_jsonrpcserver = param_jsonrpcserver;
GUIRootContext = viewer.rootContext();
qmlRegisterType<MaQParam>("MaQParam", 1, 0, "MaQParam");
GUIRootContext->setContextProperty("marpParamList", QVariant::fromValue(marpParamList));
viewer.setMainQmlFile(QStringLiteral("qml/QT_UDP_QML/MARPGUI.qml"));
viewer.showExpanded();
GUIRootObject = viewer.rootObject();
}//--- maqparam.h
#ifndef MAQPARAM_H
#define MAQPARAM_H#include <QObject>
class MaQParam : public QObject
{
Q_OBJECT
public:
explicit MaQParam(QObject *parent=0, QString par_name="unknown",QString par_value="0",QString par_min="0",QString par_max="100", QString par_description="no comment");
Q_PROPERTY(QString prop_name READ getname NOTIFY nameChanged)
Q_PROPERTY(QString prop_value MEMBER m_value )
Q_PROPERTY(QString prop_min MEMBER m_min )
Q_PROPERTY(QString prop_max MEMBER m_max )
Q_PROPERTY(QString prop_description MEMBER m_description)
QString getname(void);
signals:
void nameChanged();
public slots:private:
QString m_name;
QString m_value;
QString m_min;
QString m_max;
QString m_description;
};#endif // MAQPARAM_H
//--- maqparam.c
#include "maqparam.h"
/*
MaQParam::MaQParam(QObject *parent) : QObject(parent)
{
}
*/MaQParam :: MaQParam(QObject *parent, QString par_name,QString par_value,QString par_min,QString par_max, QString par_description) : QObject(parent)
{
m_name = par_name;
m_value = par_value;
m_min = par_min;
m_max = par_max;
m_description = par_description;
}QString MaQParam::getname(void)
{
return(m_name);
}// ParamScreen.qml
import QtQuick 2.2
import QtQuick.Dialogs 1.1
import QtGraphicalEffects 1.0
import QtQuick.Controls 1.2
import QtQuick.Controls.Styles 1.2
import QtQuick.Layouts 1.1
import MaQParam 1.0Rectangle {
x: 0
y: 0
anchors.fill: parent
gradient: Gradient {
GradientStop {
id: gradientStop3
position: 0
color: "#5d62cb"
}GradientStop { position: 1 color: "#d7d9fa" } } Button { id: closeparamlist_button x: 300 y: 325 width: 50 text: qsTr("Close") onClicked : parent.z = -1; } RowLayout { id: parameditrowlayout anchors.fill: parent Component { id: paramlijstDelegate Row { id: paramlijst Rectangle { width: 250 height: 60 color: "dark blue" radius : 5 MouseArea{ id: paramlistMouseArea anchors.fill: parent } Column { width: parent.width anchors.horizontalCenter: parent.horizontalCenter Text { width: parent.width; anchors.horizontalCenter: parent.horizontalCenter; font.pointSize : 16 ; horizontalAlignment:Text.AlignHCenter; text: prop_name; color: paramlijst.ListView.view.paramlijst_color } Text { width: parent.width; anchors.horizontalCenter: parent.horizontalCenter; font.pointSize : 16 ; horizontalAlignment:Text.AlignHCenter; text: prop_description; color: paramlijst.ListView.view.paramlijst_color } } } } } ListView { width : 260 height : 360 anchors.top : parameditrowlayout.top anchors.left: parameditrowlayout.left property color paramlijst_color: "white" //model: paramlijstModel model: marpParamList delegate: paramlijstDelegate anchors.margins: 20 clip: true spacing: 5 } Item{ id: editWindow anchors.top : parameditrowlayout.top anchors.left: parameditrowlayout.left + parameditrowlayout.width/2 width : 350 ParamEdit{ id: paramedit } } }}
// adding new parameters happens with this code (if a parameter exists it is updated instead of added)
MaQParam * pQParam; pQParam = new MaQParam((QObject *)0,nameStr,valueStr,minStr,maxStr,descriptionStr); marpParamMap.insert(nameStr,pQParam); marpParamList.clear(); foreach (MaQParam * curQParam,marpParamMap.values()) { marpParamList.append( QVariant::fromValue(curQParam)); } GUIRootContext->setContextProperty("marpParamList", QVariant::fromValue(marpParamList));...
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Maybe you should "qabstractitemmodel":http://qt-project.org/doc/qt-5/qtquick-modelviewsdata-cppmodels.html#qabstractitemmodel
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Hi,
I found the solution, it was something really simple i had overlooked :
It should access the properties through model.modelData
so use model.modelData.prop_name instead of prop_nameIt works now, the delegate becomes :
@Component {
id: paramlijstDelegate
Row {
id: paramlijst
Rectangle {
width: 250
height: 60
color: "#353535"
radius : 5
MouseArea{
id: paramlistMouseArea
anchors.fill: parent
}Column { width: parent.width anchors.horizontalCenter: parent.horizontalCenter Text { width: parent.width; anchors.horizontalCenter: parent.horizontalCenter; font.pointSize : 18 ; horizontalAlignment:Text.AlignHCenter; text : model.modelData.prop_name; color: "#00B4FF" } Text { width: parent.width; anchors.horizontalCenter: parent.horizontalCenter; font.pointSize : 14 ; horizontalAlignment:Text.AlignHCenter; text: model.modelData.prop_value; color: "#FFFFFF" } } } } }@