how to add children to the QTree Widget

ManiRon

I gave like this QList<QTreeWidgetItem>m_Data;
m_Data.append(new QTreeWidgetItem);

it throwed error saying

error: no matching function for call to 'QList<QTreeWidgetItem>::append(QTreeWidgetItem*)'
m_Data.append(new QTreeWidgetItem);
^

mrjj

Hi
List must be of pointers.
QList<QTreeWidgetItem *>
(u missed the *)

ManiRon

@mrjj

Now I gave like this sir,

QList<QTreeWidgetItem*>m_Data;
m_Data.append(new QTreeWidgetItem);

QString Data = 0;

for(int i=1;i<3;i++)
{
Data = QString("SubItem"+QString::number(i));
m_Data.append(Data.toLatin1().constData());
item->addChildren(m_Data);
}

it throws error
error: no matching function for call to 'QList<QTreeWidgetItem*>::append(const char*)'
m_Data.append(Data.toLatin1().constData());
^

mrjj

hi
well u try to add strings to it.
m_Data.append(Data.toLatin1().constData());
and it wants a QTreeWidgetItem *

I think you mean something like

for(int i=1;i<3;i++)
{
Data = QString("SubItem"+QString::number(i));
m_Data.append(Data.toLatin1().constData());
QTreeWidgetItem* item2=new QTreeWidgetItem();
// set text etc on item
m_Data.append(item2);
item->addChildren(m_Data);
}

but why do it liek that since u new it there anyway so just add it directly ?

mrjj

How are you trying to add it ?

aaa
  bbb
     ccc

or

aaa
 bbbb
ccc
 ddd

ManiRon

This post is deleted!

ManiRon

@mrjj

Something like this , top level item = aaaa

children = bbbb,
cccc,
dddd,
eeee,
and child of eeee is ffff

mrjj

@ManiRon
Ok.
Nothing odd then :)
Then you just need to keep aaaa pointer around and
eeee so you can add child to that.

ManiRon

@mrjj sir i tried the way u mentioned but i got like this

my code:

QList<QTreeWidgetItem*>m_Data;
m_Data.append(new QTreeWidgetItem);

QString Data = 0;
for(int i=1;i<3;i++)
{
Data = QString("SubItem"+QString::number(i));
QTreeWidgetItem* item1 =new QTreeWidgetItem(ui->treeWidget);
item1->setText(0,"data1");
m_Data.append(item1);
item1->setText(0,Data.toLatin1().constData());
m_Data.append(item1);
item->addChild(item1);
item1->addChildren(m_Data);
}

mrjj

@ManiRon
hi
seems like blank texts. also i dont see u new item.??
anyway, that loop looks so messy and hard to read
if you use functions, it can look like this

QTreeWidgetItem * addTreeRoot(QTreeWidget* treeWidget, QString name, QString description) {
    QTreeWidgetItem *treeItem = new QTreeWidgetItem(treeWidget);
    treeItem->setText(0, name);
    treeItem->setText(1, description);
    return treeItem;
}

QTreeWidgetItem * addTreeChild(QTreeWidgetItem *parent,QString name, QString description) {
    QTreeWidgetItem *treeItem = new QTreeWidgetItem();
    treeItem->setText(0, name);
    treeItem->setText(1, description);
    parent->addChild(treeItem);
    return treeItem;
}
--

QTreeWidgetItem* root=addTreeRoot(ui->treeWidget,"ROOT","text");
addTreeChild(root,"bbbb","text");
addTreeChild(root,"ccc","text");
addTreeChild(root,"dddd","text");
QTreeWidgetItem* last=addTreeChild(root,"eeee","text");

addTreeChild(last,"eeeee","text"); // notice last as parent

alt text

ManiRon

@mrjj i am not getting sir,
how i will declare the these functions?

mrjj

@ManiRon
hi
Just paste them into cpp file. they are just free functions.

alt text

ManiRon

@mrjj errors came

JonB

@ManiRon
Look at your line #100. What in the world is the -- there?? You really ought be able to do this sort of thing for yourself....

ManiRon

@JonB I removed it sir, Same error coming

JonB

@ManiRon
So after removing the -- is still warns on line #102 with specific message "expected primary-expression before "*" token", that's what you're saying, right?

ManiRon

@JonB NO sir other than that all error are there

JonB

@ManiRon
Great, so I tell you one thing that is wrong, and you say it does not change the errors when in fact it does, and I have to guess....

Look at the very first error message line. It tells you you are still inside function on_pushButton_clicked(). Do you show us that function? No. There is nothing (else) wrong with what you have pasted, but you haven't pasted it in the correct place. Nobody is going to be able to help you on that with what you show. Good luck, I'm out.

ManiRon

@JonB

The whole code

void MainWindow::on_pushButton_clicked()
{
// Create new item (top level item)
QTreeWidgetItem *topLevelItem = new QTreeWidgetItem(ui->treeWidget);

// Set text for item
topLevelItem->setText(0,"Item");

// Add it on our tree as the top item.
ui->treeWidget->addTopLevelItem(topLevelItem);

// Create new item and add as child item
QTreeWidgetItem *item=new QTreeWidgetItem(topLevelItem)

 QList<QTreeWidgetItem*>m_Data;
 m_Data.append(new QTreeWidgetItem);

QString Data = 0;
QTreeWidgetItem* item1 =new QTreeWidgetItem(ui->treeWidget);
for(int i=1;i<3;i++)
{

   Data = QString("SubItem"+QString::number(i));

   item1->setText(0,"data1");
   m_Data.append(item1);
   item1->setText(0,Data.toLatin1().constData());
   m_Data.append(item1);


}

item1->addChildren(m_Data);
item->addChild(item1);

QTreeWidgetItem * addTreeRoot(QTreeWidget* treeWidget, QString name,QString description)
{
     QTreeWidgetItem *treeItem = new QTreeWidgetItem(treeWidget);
     treeItem->setText(0, name);
     treeItem->setText(1, description);
     return treeItem;
}

QTreeWidgetItem * addTreeChild(QTreeWidgetItem *parent,QString name,QString description)
{
     QTreeWidgetItem *treeItem = new QTreeWidgetItem();
     treeItem->setText(0, name);
     treeItem->setText(1, description);
     parent->addChild(treeItem);
     return treeItem;
}
QTreeWidgetItem* root=addTreeRoot(ui->treeWidget,"ROOT","text");
addTreeChild(root,"bbbb","text");
addTreeChild(root,"ccc","text");
addTreeChild(root,"dddd","text");
QTreeWidgetItem* last=addTreeChild(root,"eeee","text");

addTreeChild(last,"eeeee","text"); // notice last as parent

}

mrjj

@ManiRon
did u put the full functions INSIDE void MainWindow::on_pushButton_clicked() ????
it sure seems so. And that is plain wrong.
Should be OVER void MainWindow::on_pushButton_clicked()
and never, ever inside.
Look at the picture again. :)