How to get the state of the QCheckbox on QTreeWidget while user clicks on it?

thippu

Hi,

I have some one or more dynamic QCheckBox Widgets on the QTreeWidget
2)I did add them to QTreeWidgetItem::setItemWidget() , Now while the user checks or unchecks I need to receive state and change the value according to the state in the corresponding iniSettings.
3)How to do it?
code:

void Widget::createChild(QTreeWidgetItem &rootaddress,const QString &key,const QVariant &value)
{
bool checkItem=isCheckboxItem(rootaddress.text(0),key);
if(checkItem)
{
      QTreeWidgetItem *child=new QTreeWidgetItem;
      child->setText(0,key);
     QCheckBox *tempCheckbox=new QCheckBox;
     connect(tempCheckboc,SIGNAL(toggled(bool)),SLOT(check(bool)));//this is working, I have connected to local slot and I am 
     //gettings the true and false states from it, but can we able to get the parent and child QTreeWidgetItem of it?.
     child->setTextAlignment(0,Qt::AlignCenter);
     int val=value.toInt();
    if(val==1)
    {
      tempCheckbox->setChecked(true);
     }
   else
   {
     tempCheckbox->setChecked(false);
    }
rootaddress.addchild(child);
displayTreeWidget->setItemWidget(child,1,tempCheckbox);
displayTreeWidget->itemWidget(child,1);
}else{
  QTreeWidgetItem *child=new QTreeWidgetItem;
  child->setText(0,key);
  child->setTextAlignment(0,Qt::AlignCenter);
  child->setData(1,2,value);
  rootaddress.addChild(child);
}

Ui link
4) I need to get the toplevel QTreeWidgetItem name and sub QTreeWidgetItem name of corresponding QCheckBox, a user clicks.

JonB

@thippu
In your checkItem == true route, I see a QTreeWidgetItem and a QCheckBox being created, but nowhere do I see them being added into the tree. Are we to presume you have such code but do not show it?

Because I assume you find the QTreeWidgetItem by following the signalled QCheckBox's parent hierarchy, as necessary.

P.S.
If @VRonin sees this, I imagine he will be here like a bull in a china shop, cussing at you for trying to use QTreeWidgetItem::setItemWidget() and showing you how to do what you want via QStyledItemDelegate, in which case your problem might go away....

thippu

In your checkItem == true route, I see a QTreeWidgetItem and a QCheckBox being created, but nowhere do I see them being added into the tree. Are we to presume you have such code but do not show it?

Hi,
That is typo mistake, I have a development server, which is restricted from using the internet and copying through a pen drive or etc, So I can't able to do copy and paste. I'm asking apologizes from u.

thippu

@JonB using this approach cannot able to achieve solve this problem?

thippu

@JonB said in How to get the state of the QCheckbox on QTreeWidget while user clicks on it?:

Because I assume you find the QTreeWidgetItem by following the signalled QCheckBox's parent hierarchy, as necessary.

I don't know still how to find it. I need help to find it.

VRonin

@thippu said in How to get the state of the QCheckbox on QTreeWidget while user clicks on it?:

I did add them to QTreeWidgetItem::setItemWidget()

As a rule of thumb, setItemWidget() should not be used unless you have a very strong and thought reason (see my signature for my stance on this method).

This is a typical case where setItemWidget() is not just useless but also more complicated to use than the native solution.

To have a checkbox in a QTreeWidgetItem you just need to call widgetItem->setData(column, Qt::CheckStateRole, Qt::Unchecked);. If you want the user to be able to check/uncheck the box, use widgetItem->setFlags(widgetItem->flags() | Qt::ItemIsUserCheckable);

To detect changes to the items checked/unchecked you can use:

connect(treeWidget->model(),&QAbstractItemModel::dataChanged,[](const QModelIndex& topLeft, const QModelIndex& bottomRight, const QVector<int>& roles){
if(!roles.contains(Qt::CheckStateRole)) return;
// the checkboxes between topLeft and bottomRight changed
// usually topLeft == bottomRight 
// you can use topLeft.parent() to get the item 1 step higher in the hierarchy
}

thippu

@VRonin Thank you bro.

thippu

I had an idea to solve this, what I did is:
1)Created QVector<QCheckbox*>checkbox and populated references in it and QSetting paths with the group, the key in another QVector<QString> in below function:

void Widget::createChild(QTreeWidgetItem &rootaddress,const QString &key,const QVariant &value)
{
bool checkItem=isCheckboxItem(rootaddress.text(0),key);
if(checkItem)
{
QTreeWidgetItem *child=new QTreeWidgetItem;
child->setText(0,key);
QCheckBox *tempCheckbox=new QCheckBox;
connect(tempCheckboc,SIGNAL(toggled(bool)),SLOT(check(bool)));//this is working, I have connected to local slot and I am
//gettings the true and false states from it, but can we able to get the parent and child QTreeWidgetItem of it?.
child->setTextAlignment(0,Qt::AlignCenter);
int val=value.toInt();
if(val==1)
{
tempCheckbox->setChecked(true);
}
else
{
tempCheckbox->setChecked(false);
}
rootaddress.addchild(child);
displayTreeWidget->setItemWidget(child,1,tempCheckbox);
displayTreeWidget->itemWidget(child,1);
}else{
QTreeWidgetItem *child=new QTreeWidgetItem;
child->setText(0,key);
child->setTextAlignment(0,Qt::AlignCenter);
child->setData(1,2,value);
rootaddress.addChild(child);
}

In the slot I did

void Widget::check(bool state)
{
 if(state)
{
QCheckBox *p=static_cast<QCheckBox *>(QObject::sender());
int index=checkbox_refs->indexOf(p);
QString temppath=checkbox_paths->value(index);
QVariant value=1;
iniSettings->setValue(temppath,value.toString());
iniSettings->sync();
}
else
{
QCheckBox *p=static_cast<QCheckBox *>(QObject::sender());
int index=checkbox_refs->indexOf(p);
QString temppath=checkbox_paths->value(index);
QVariant value=1;
iniSettings->setValue(temppath,value.toString());
iniSettings->sync();
}
}

It works but one issue is there:

1)it correctly updates the value on the key of QSettings::objectbut
2)also adds groupname\keyname=value after it. why and how to solve this.
Ui
output