Setting checked property of a button

[pra7]

I am having a group of buttons in a Column and i have set autoExclusive : true. Now only one button can be checked as expected. But, how to disable the checked state if i click on the button which is already checked? Following is the code:

Column {
        id: column
        
        Button {
            checked: true
            text: qsTr("button 1")
            autoExclusive : true
            checkable : true
            background: Rectangle {
                color:checked ? "red" : "white"
            }
        }
        
        Button {
            checked: true
            text: qsTr("button 2")
            autoExclusive : true
            checkable : true
            background: Rectangle {
                color:checked ? "red" : "white"
            }
        }
        
        Button {
            checked: true
            text: qsTr("button 3")
            autoExclusive : true
            checkable : true
            background: Rectangle {
                color:checked ? "red" : "white"
            }
        }
    }

[A Former User]

Hi! Unfortunately, this is not supported by the exclusive group mechanism. But it's easy to implement it yourself.

mygroup.h

#ifndef MYGROUP_H
#define MYGROUP_H

#include <QObject>

class MyGroup : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QList<QObject*> buttons READ buttons WRITE setButtons NOTIFY buttonsChanged)
public:
    MyGroup(QObject *parent = nullptr);
    QList<QObject*> buttons();
    void setButtons(QList<QObject*> btns);
signals:
    void buttonsChanged(QList<QObject*>);
private slots:
    void disableOthers();
private:
    QList<QObject*> m_buttons;
};

#endif // MYGROUP_H

mygroup.cpp

#include "mygroup.h"
#include <QVariant>

MyGroup::MyGroup(QObject *parent)
    : QObject(parent)
{
}

QList<QObject *> MyGroup::buttons()
{
    return m_buttons;
}

void MyGroup::setButtons(QList<QObject *> btns)
{
    if (m_buttons == btns)
        return;

    for (auto i: m_buttons)
        disconnect(i, SIGNAL(clicked()), this, SLOT(disableOthers()));

    m_buttons = btns;

    for (auto i: m_buttons)
        connect(i, SIGNAL(clicked()), this, SLOT(disableOthers()));

    emit buttonsChanged(m_buttons);
}

void MyGroup::disableOthers()
{
    for (auto i: m_buttons) {
        if (i == sender())
            continue;
        i->setProperty("checked", false);
    }
}

in main.cpp

qmlRegisterType<MyGroup>("io.qt.forum", 1, 0, "MyGroup");

main.qml

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.3
import io.qt.forum 1.0 as Forum

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    color: "black"

    Forum.MyGroup {
        buttons: [btn1, btn2, btn3]
    }

    Column {
        id: column
        anchors.centerIn: parent
        spacing: 10

        Button {
            id: btn1
            text: "button1"
            checkable : true
            background: Rectangle {
                color: parent.checked ? "red" : "white"
            }
        }

        Button {
            id: btn2
            text: "button2"
            checkable : true
            background: Rectangle {
                color: parent.checked ? "red" : "white"
            }
        }

        Button {
            id: btn3
            text: "button3"
            checkable : true
            background: Rectangle {
                color: parent.checked ? "red" : "white"
            }
        }
    }
}

[pra7]

@Wieland thanks !!! for the answer.