check/uncheck all problem

chilarai

I have the following code to check/uncheck all other checkboxes in a listview. I am using the ButtonGroup component to achieve the same. It seems to achieve what it is intended to do but when I uncheck all of them and scroll through the listview, a few of the items on the top and bottom of the list are automatically checked again. What could be wrong?

import QtQuick 2.3
import QtQuick.Controls 2.15


Rectangle {
    id: win
    width: parent.width
    height: parent.height
    visible: true


    ButtonGroup {
           id: childGroup
           exclusive: false
           checkState: mainCheckBox.checkState
       }

       CheckBox {
           id: mainCheckBox
           checked: true
           text: "All"
           indicator.width: 15
           indicator.height: 15
           checkState: childGroup.checkState
       }

       ListView {
           id: multiSelectCheckList
           model: [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40]
           height: parent.height
           width: parent.width
           anchors {
               top: mainCheckBox.bottom
               margins: 10
           }

           delegate: CheckBox {
               id: modelCheckBoxes
               checked: true
               text: modelData
               indicator.width: 15
               indicator.height: 15
               ButtonGroup.group: childGroup
           }
       }
}

ODБOï

hi
you need a real model or an array where you save the state of every checkbox

delegate: CheckBox {
               id: modelCheckBoxes
               checked: true // << access your array where the values are saved

chilarai

But then do you mean to say the ButtonGroup component is of no use for such a case?

Is it only good for Radio buttons?

ODБOï

@chilarai I have never used it actually but here is the description
https://doc.qt.io/qt-5/qml-qtquick-controls2-buttongroup.html#details

from a quick, look it allows you to have a mutually exclusive group of buttons but it does not dave anything to do with the way you handle your listview/model etc..

chilarai

@ODБOï noted and fixed as you have mentioned