Accessing QML ListModel-Items with C++

[Zamahra]

Hey Guys,

After finishing my program with a regular Qt Gui I have to update it for tablets. One main feature is the possibility to rearrange the UI by Drag&Drop. There are 7 elements with each 3 pictures. These pictures shall be updated by c++ code.

My problem is that I don't know how to access the different elements to change the pictures. This is what I've written:

main.cpp
@#include <QApplication>
#include <QtCore>
#include <QQuickItem>
#include <QQuickView>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

#include "qtquick2applicationviewer.h"
#include "gui.h"

int main(int argc, char *argv[])
{
QApplication app(argc, argv);

QtQuick2ApplicationViewer viewer;
viewer.setMainQmlFile(QStringLiteral("qml/QML-MRGalleyServer/main.qml"));
viewer.show();
QQuickItem* item = viewer.rootObject();
item->setProperty("galleyColor","#a6cea9"); // Works without problems

QList<QObject*> objectList = viewer.findChildren<QObject*>("galley1"); // does not work
for(int i = 0; i&lt;objectList.size();i++){
    if(objectList.at(i))
        objectList.at(i)-&gt;setProperty("nextpicture","Images/widget2.png");
}


qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
return app.exec&#40;&#41;;

}@

WidgetModel.qml
@import QtQuick 2.0

ListModel {
ListElement {
objectName: "galley1"
hoverColor: "#5040e020"
color: "transparent"
galleyName: "Galley 1"
nextpicture: "Images/widget1.png"
currentpicture: "Images/widget1.png"
lastpicture: "Images/widget1.png"
}
ListElement {
objectName: "galley2"
hoverColor: "#5040e020"
color: "transparent"
galleyName: "Galley 2"
nextpicture: "Images/widget2.png"
currentpicture: "Images/widget2.png"
lastpicture: "Images/widget2.png"
}
}@

main.qml
@Rectangle{
id: window

    property color galleyColor

    width: 1366
    height: 768
    color: "#00ff15"

    ListView {
        id: galleylist
        x: 0
        y: 0
        width: 1366
        height: 768
        boundsBehavior: Flickable.StopAtBounds
        z: 1
        anchors.horizontalCenterOffset: 50
        anchors.topMargin: 100
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.verticalCenter: parent.verticalCenter
        anchors.top: parent.top
        spacing: 10
        orientation: ListView.Horizontal

        displaced: Transition {
            NumberAnimation { properties: "x,y"; easing.type: Easing.OutQuad }
        }

        model: VisualDataModel {
            id: visualModel
            model: WidgetModel {
                id: colormodel}

            delegate: MouseArea {
                id: delegateRoot

                property int visualIndex: VisualDataModel.itemsIndex

                width: 170; height: 400
                drag.target: icon

                GalleyViewer {
                    objectName: model.objectName
                    id: icon
                    width: 170; height: 400
                    anchors {
                        horizontalCenter: parent.horizontalCenter;
                        verticalCenter: parent.verticalCenter
                    }
                    color: galleyColor
                    mouseOverColor: model.hoverColor
                    galleyName: model.galleyName
                    nextpicture: model.nextpicture
                    lastpicture: model.lastpicture
                    currentpicture: model.currentpicture
                    radius: 3

                    Drag.active: delegateRoot.drag.active
                    Drag.source: delegateRoot
                    Drag.hotSpot.x: 36
                    Drag.hotSpot.y: 36

                    states: [
                        State {
                            when: icon.Drag.active
                            ParentChange {
                                target: icon
                                parent: galleylist
                            }

                            AnchorChanges {
                                target: icon;
                                anchors.horizontalCenter: undefined;
                                anchors.verticalCenter: undefined
                            }
                        }
                    ]
                }

                DropArea {
                    anchors { fill: parent; margins: 15 }
                    onEntered: visualModel.items.move(drag.source.visualIndex, delegateRoot.visualIndex)
                }
            }
        }
}

@

Does anyone know where my fault is? Or is there a simpler solution? If anyone knows good examples for c++ programs with qml guis let me know =)

Thank you!