SpinBox does not display the new value that has changed in the c++ model,

Idodoqdo

Hello everyone. I have a SpinBox that displays the value of the model that is in the QAbstractListModel. The switch is working correctly

CameraSettingValue.qml

import QtQuick 2.15
import QtQuick.Layouts 1.15
import QtQuick.Controls 2.15

Item {
    id:cell

    RowLayout {
        spacing: 0
        anchors.fill: parent
        Rectangle {
            border.color: "black"
            color: "black"
            Layout.preferredWidth: parent.width * 0.2
            Layout.fillHeight: true
            Switch {
                checked: switched
                anchors.centerIn: parent
                visible: isHaveSwitch
                Layout.alignment: Qt.AlignHCenter | Qt.AlignVCenter
                onClicked: {
                    switched = !switched
                }

            }
        }
        Rectangle {
            color: "black"
            Layout.fillWidth:  true
            Layout.fillHeight: true
            Text {
                font.bold: true
                color: "white"
                text: name
                anchors.left: parent.left
                anchors.verticalCenter: parent.verticalCenter

            }
        }
        SpinBox {
           id: spinbox
           Layout.preferredWidth: parent.width * 0.3

           from: 0
           value: model.value
           to: 100

           validator: DoubleValidator {
               bottom: Math.min(spinbox.from, spinbox.to)
               top:  Math.max(spinbox.from, spinbox.to)
           }

           onValueChanged: {
               model.value = value
               print(model.value)
           }
        }
    }
}

cma_cfg_set_model.cc

ameraConfigurationSettingsModel::CameraConfigurationSettingsModel(QObject * parent)
    :QAbstractListModel(parent)
{
    roleNames_[nameRole] = "name";
    roleNames_[valueRole] = "value";
    roleNames_[switchedRole] = "switched";
    roleNames_[isHaveSwitch] = "isHaveSwitch";
}

int CameraConfigurationSettingsModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent)

    return settings_.count();
}

QVariant CameraConfigurationSettingsModel::data(const QModelIndex &index, int role) const
{
    int row = index.row();

    if (row < 0 || row >= settings_.count()) {
        return QVariant();
    }

    const CameraConfigurationSetting& setting = settings_[row];

    switch (role) {
    case nameRole:
        return setting.GetName();
    case valueRole:
        return setting.GetValue();
    case switchedRole:
        return setting.IsSwitched();
    case isHaveSwitch:
        return setting.IsHaveSwitch();
    }

    return QVariant();

}

bool CameraConfigurationSettingsModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    int row = index.row();

    if (row < 0 || row >= settings_.count()) {
        return false;
    }

    CameraConfigurationSetting& setting = settings_[row];

    switch (role) {
        case valueRole:
            setting.SetValue(value.toDouble());
            return true;
        case switchedRole:
            setting.Switch();
            return true;
    }

    return false;
}

void CameraConfigurationSettingsModel::addSetting(CameraConfigurationSetting setting)
{
    settings_.append(setting);
}

void CameraConfigurationSettingsModel::calibrate()
{
    for (auto &setting: settings_) {
        setting.SetValue(0);
        if (setting.IsHaveSwitch() && setting.IsSwitched()) {
            setting.Switch();
        }
    }

    emit dataChanged(index(0, 0), index((count() - 1), 0));
}

int CameraConfigurationSettingsModel::count() const
{
    return settings_.count();
}

QHash<int, QByteArray> CameraConfigurationSettingsModel::roleNames() const
{
    return roleNames_;
}

I made the calibrate invoke method. I call it when I press the qml button. The call is being made

            onButtonClicked: {
                SettingsLeftSideModel.calibrate()
            }

Christian Ehrlicher

Your setData() function is missing the dataChanged() signal as described in the documentation.

Idodoqdo

@Christian-Ehrlicher
then why does the value of the Switch change?I made the following code:

bool CameraConfigurationSettingsModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    int row = index.row();

    if (row < 0 || row >= settings_.count()) {
        return false;
    }

    CameraConfigurationSetting& setting = settings_[row];

    switch (role) {
        case valueRole:
            setting.SetValue(value.toDouble());
            emit dataChanged(index, index);
            return true;
        case switchedRole:
            setting.Switch();
            emit dataChanged(index, index);
            return true;
    }

    return false;
}

It didn't help

Idodoqdo

I found out that there really is 0 in the data, qml displays the old value

        SpinBox {
           id: spinbox
           Layout.preferredWidth: parent.width * 0.3

           from: 0
           value: model.value
           to: 100

           validator: DoubleValidator {
               bottom: Math.min(spinbox.from, spinbox.to)
               top:  Math.max(spinbox.from, spinbox.to)
           }

           onValueChanged: {
               print(model.value) // print 0 after calibrate
               model.value = value
           }
        }

Idodoqdo

I changed the default value in c++ model to 50, after I received such messages in the console:

set value in the model c++ 50
qrc:/CameraSettingValue.qml:40:9: QML SpinBox: Binding loop detected for property "value"
qml: 50
set value in the model c++ 50
qrc:/CameraSettingValue.qml:40:9: QML SpinBox: Binding loop detected for property "value"
qml: 50
set value in the model c++ 50
qrc:/CameraSettingValue.qml:40:9: QML SpinBox: Binding loop detected for property "value"
qml: 50
set value in the model c++ 50
qrc:/CameraSettingValue.qml:40:9: QML SpinBox: Binding loop detected for property "value"

before that, there was no

qrc:/CameraSettingValue.qml:40:9: QML SpinBox: Binding loop detected for

Now, when you click on the button, the values become 0, but after the 1st time it no longer works