how to add children to the QTree Widget

ManiRon

I am trying to add children to the QTree widget . but i am facing some problems.

My code:

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

QList<QString>m_Data;

for(int i=1;i<3;i++)
{
    QString Data = QString("SubItem"+QString::number(i));
    m_Data.append(Data);
}

item->addChildren(m_Data);

mrjj

Hi
You are not really telling what kind of problems :)
but this tutorial explain usage pretty well in my opinion

https://www.bogotobogo.com/Qt/Qt5_QTreeWidget.php

The main idea is either to add as a top level item or
add to other parent to build a tree like structure.

void Dialog::addTreeRoot(QString name, QString description)
{
    // QTreeWidgetItem(QTreeWidget * parent, int type = Type)
    QTreeWidgetItem *treeItem = new QTreeWidgetItem(ui->treeWidget);

    // QTreeWidgetItem::setText(int column, const QString & text)
    treeItem->setText(0, name);
    treeItem->setText(1, description);
    addTreeChild(treeItem, name + "A", "Child_first");
    addTreeChild(treeItem, name + "B", "Child_second");
}

void Dialog::addTreeChild(QTreeWidgetItem *parent,
                  QString name, QString description)
{
    // QTreeWidgetItem(QTreeWidget * parent, int type = Type)
    QTreeWidgetItem *treeItem = new QTreeWidgetItem();

    // QTreeWidgetItem::setText(int column, const QString & text)
    treeItem->setText(0, name);
    treeItem->setText(1, description);

    // QTreeWidgetItem::addChild(QTreeWidgetItem * child)
    parent->addChild(treeItem);
}

ManiRon

@mrjj
Actually i want to add n number of children and child to that n number of children thats my question. But using the code.

Example:
I want to store the data in a Qlist and insert it in Qtree widget as children using the "addchildren"member function

mrjj

@ManiRon
Ok, but there nothing magic to it.
If you add it like
QTreeWidgetItem *treeItem = new QTreeWidgetItem(ui->treeWidget);

its a top level item
if you use that item as parent, like

QTreeWidgetItem *treeItem2 = new QTreeWidgetItem();
treeItem ->addChild(treeItem2 );

it becomes a child of that parent. and so on.

so you simply use the last item as parent for next if u want it to go

aaa
  bbbb
    cccc

ManiRon

@mrjj ok but if i want to add n number of children under top level item how should i do that.

And i have another doubt .
I am trying to see the data which i have inserted into my QList . I can see the size but i cannot see the data.

Code:

QList<QString> m_Data;
for(int i=1;i<3;i++)
{
Data = QString("SubItem"+QString::number(i));
m_Data.append(Data.toLatin1().constData());
QString H = m_Data.at(i); //trying to see data
qDebug()<<"Data"<< m_Data.at(i);
}

ManiRon

@mrjj

Sir i have a doubt

mrjj

@ManiRon
Hi
With ?

ManiRon

@mrjj

pro file

ManiRon

@mrjj

Sir i am trying to add

uinx{
LIBS+= -L$$PWD/.../lib/linus/-lData
LIBS+= -L$$PWD/.../lib/Xenomai/-lData1 -lrtdm -lrt -lxenomai
}
win32
{
LIBS += path
}

I am adding the linux and xenomai library and trying to compile . but it throws error. As it detects the linux library and it couldnt find the xenomai library it throws error.
My question is i want to define all my library and based on the platform or OS i am running it should detect its particular library.
For example : linux, xenomai, windiows. These are the platforms i am running the application. Why i ask this is because every time i have to add the corresponding library and compile it and the run the application . So is there any solution for this?

ManiRon

@mrjj

One of the person from this forum told me to use "unix" and "win32". But i asked for linux,xenomai what should i define, he told to use "unix" itself. But i have separate library for linux and xenomai. but i want to add both is there any way?

mrjj

@ManiRon

Hi it seems ok what you did
except you missspelled unix (uinx)
and it sometimes a bit funny with scopes so make sure t to
unix {
}
and not
unix
{
}
http://doc.qt.io/qt-5/qmake-advanced-usage.html
http://doc.qt.io/qt-5/third-party-libraries.html

ManiRon

@mrjj

Ok Sir,

But my doubt is i am able to add the library.
But i am adding another library that supports xenomai. while running the application in linux OS it goes to the unix{
LIBS+= -L$$PWD/.../lib/linus/-lData
LIBS+= -L$$PWD/.../lib/Xenomai/-lData1 -lrtdm -lrt -lxenomai
}
part and searches for the library which is my problem, I want the application to detect the library based on the platform i run. As one person from Qt forum said unix is common for xenomai, linux. So is there any possibility i can make my application to run that particular library based on OS platform?

mrjj

@ManiRon
But is unix not linux for you ?
You have a unix build and a linux build?

I would assume you can do it right with


win32 {
..
}

unix {
  ..
}

ManiRon

@mrjj

its linux sir,

but for xenomai also it is unix i think so
unix{
LIBS+= -L$$PWD/.../lib/linus/-lData
LIBS+= -L$$PWD/.../lib/Xenomai/-lData1 -lrtdm -lrt -lxenomai
}

this is my problem sir,

I am want to run library if its linux i want linux library and if its xenomai i want xenomai library to run

ManiRon

@mrjj

ya i did this but for windows it works fine, and in unix if i define only one library that the platform i am running it works fine.

but every time i want to add that particular library compile and run the application

mrjj

Hi
Now i understand.
For qmake both plain linux and xenomai will be the same
as far as i know. (unix)

you can call .sh script and things like that from the pro file
so maybe you can detect your self if linux or xenomai ?
http://doc.qt.io/archives/qt-4.8/qmake-function-reference.html#system-command

Check what

UNAME = $$system(uname -s)
contains( UNAME, [lL]inux ):message( This looks like Linux ($$UNAME) to me )

will output

also did u try what been suggested in
https://forum.qt.io/topic/94393/how-to-add-macro-for-the-libs-in-the-pro-file/9

ManiRon

@mrjj said in how to add children to the QTree Widget:

UNAME = $$system(uname -s)
contains( UNAME, [lL]inux ):message( This looks like Linux ($$UNAME) to me )

So thsi is for linux?
UNAME = $$system(uname -s)
contains( UNAME, [lL]inux ):message( This looks like Linux ($$UNAME) to me )

If i want to check for xenomai what should i do sir?

ManiRon

@mrjj

Is there any way sir?

mrjj

@ManiRon
Hi
Yes you can do it.
But you need to find out how. I dont have xenomai
installed so i cant say how we can spot the difference between plain linux and
xenomai
so try
UNAME = $$system(uname -s)
on both systems and see what it types.
If different, you can use that as a flag

ManiRon

@mrjj

contains( UNAME, [lL]inux ):message( This looks like Linux ($$UNAME) to me )

This message where it will be printed sir?