Looking for a sample example in which QtreeWidget at left side QSplitter and QStackedWidget on right side

[VRonin]

#include <QWidget>
#include <QTreeWidget>
#include <QStackedWidget>
#include <QSplitter>
#include <QVBoxLayout>
#include <QLabel>
#include <QTableWidget>
#include <QTextEdit>
class ExampleWid : public QWidget{
    Q_OBJECT
    Q_DISABLE_COPY(ExampleWid)
public:
    ExampleWid(QWidget* parent = Q_NULLPTR)
        : QWidget(parent)
    {
        QSplitter* mainSplit =new QSplitter(Qt::Horizontal,this);
        QVBoxLayout* mainLay=new QVBoxLayout(this);
        mainLay->addWidget(mainSplit);
        m_tree=new QTreeWidget(this);
        m_tree->setSelectionMode(QAbstractItemView::SingleSelection);
        mainSplit->addWidget(m_tree);
        m_stacked=new QStackedWidget(this);
        mainSplit->addWidget(m_stacked);
        connect(m_tree->selectionModel(),&QItemSelectionModel::currentChanged,this,&ExampleWid::pageChange);
        addTestData();
        m_tree->selectionModel()->setCurrentIndex(m_tree->model()->index(0,0),QItemSelectionModel::ClearAndSelect);
        m_tree->expandAll();
    }
private:
    Q_SLOT void pageChange(const QModelIndex& idx){
        if(idx.isValid())
            m_stacked->setCurrentIndex(idx.data(Qt::UserRole).toInt());
    }
    void addTestData(){
        QAbstractItemModel* const mdl = m_tree->model();
        mdl->removeRows(0,mdl->rowCount());
        mdl->removeColumns(0,mdl->columnCount());
        mdl->insertRows(0,2);
        QModelIndex tempIdx = mdl->index(0,0);
        mdl->insertRow(0,tempIdx);
        tempIdx = mdl->index(1,0);
        mdl->insertRow(0,tempIdx);
        ////////////////////////////////////////
        tempIdx = mdl->index(0,0);
        mdl->setData(tempIdx,"Parent1");
        mdl->setData(tempIdx,m_stacked->addWidget(new QLabel("Parent1",this)),Qt::UserRole);
        ////////////////////////////////////////
        ///////////////////////////////////////////
        tempIdx = mdl->index(0,0,tempIdx);
        mdl->setData(tempIdx,"Child1");
        mdl->setData(tempIdx,m_stacked->addWidget(new QTextEdit("Child1",this)),Qt::UserRole);
        ////////////////////////////////////////
        ////////////////////////////////////////
        tempIdx = mdl->index(1,0);
        mdl->setData(tempIdx,"Parent2");
        mdl->setData(tempIdx,m_stacked->addWidget(new QLabel("Parent2",this)),Qt::UserRole);
        ////////////////////////////////////////
        ////////////////////////////////////////
        tempIdx = mdl->index(0,0,tempIdx);
        mdl->setData(tempIdx,"Child2");
        QTableWidget* tempTable = new QTableWidget(2,2,this);
        tempTable->model()->setData(tempTable->model()->index(0,0),"Child2 Cell 0,0");
        tempTable->model()->setData(tempTable->model()->index(1,0),"Child2 Cell 1,0");
        tempTable->model()->setData(tempTable->model()->index(0,1),"Child2 Cell 0,1");
        tempTable->model()->setData(tempTable->model()->index(1,1),"Child2 Cell 1,1");
        mdl->setData(tempIdx,m_stacked->addWidget(tempTable),Qt::UserRole);
        ////////////////////////////////////////
    }
    QTreeWidget* m_tree;
    QStackedWidget* m_stacked;
};

[Qt Enthusiast]

One more question

If I have a QMap in which I have

QMap<QString,QWidget*> map;

widget1 = new WidgetA();
map["Parent"] = widget1;
widget2 = new WidgetB();
map["Parent2"] = widget2;

I will using

tempIdx = mdl->index(0,0);
mdl->setData(tempIdx,"Parent1");
mdl->setData(tempIdx,m_stacked->addWidget(widetA,Qt::UserRole);
////////////////////////////////////////
///////////////////////////////////////////
tempIdx = mdl->index(0,0,tempIdx);
mdl->setData(tempIdx,"Child1");
mdl->setData(tempIdx,m_stacked->addWidget(new idgetB)),Qt::UserRole);

how to create a textEdit when the class of QTextEdit and map as value as QWIdget ?

[VRonin]

I'm not sure I understood correctly. what does

how to create a textEdit when the class of QTextEdit and map as value as QWIdget ?

mean?

How would you determine the parent-child relation in the tree from a flat QMap?

[Qt Enthusiast]

QMap mymap<QString,QTextEdit>
mymap["name"] = new QTextEdit;

this shoudl work

[VRonin]

Yes but how do you know if "name" is a parent or a child and a child of what?

[Qt Enthusiast]

Iif I have a tree like

Parent1
Child1
ChildAofChild1
Child2
ChildAofChild1
Parent2
Child2
ChildAofChild2
Child2
ChildAofChild2

can u suggest the changes in addTestData

[VRonin]

I still don't understand what's the link between the model and the QMap, sorry

[Qt Enthusiast]

now now it si not QMAp
it is change in Tree now the tree is chaged

the tree has to be like in https://ibb.co/ebS6QG . Please help

[Qt Enthusiast]

I tried the following code

    = mdl->index(0,0);
    mdl->setData(tempIdx,"Parent1");
    mdl->setData(tempIdx,m_stacked->addWidget(QLabel("A"),Qt::UserRole);
    ////////////////////////////////////////
    ///////////////////////////////////////////
    tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"Child1");
    mdl->setData(tempIdx,m_stacked->addWidget(new QTextEdit("Child1",this)),Qt::UserRole);

    QModelIndex tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"ChildOfChidl1");

    QTableWidget* tempTable1 = new QTableWidget(2,2,this);
    tempTable1->model()->setData(tempTable1->model()->index(0,0),"ChildOfChild1 Cell 0,0");
    tempTable1->model()->setData(tempTable1->model()->index(1,0),"ChildOfChild1 Cell" ,0");
    mdl->setData(tempIdx,m_stacked->addWidget(tempTable1),Qt::UserRole);

[VRonin]

You are definitely on the right path. The setting of data is correct, you just forgot to insert a line in the tree before writing to it. Like I did in:

 QModelIndex tempIdx = mdl->index(0,0);
mdl->insertRow(0,tempIdx);

[Qt Enthusiast]

One more question regarding the sequnce of displayed children

   QModelIndex tempIdx  = mdl->index(0,0);
    mdl->setData(tempIdx,"Parent1");
    mdl->setData(tempIdx,m_stacked->addWidget(QLabel("A"),Qt::UserRole);
    ////////////////////////////////////////
    ///////////////////////////////////////////
    tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"Child1");
    mdl->setData(tempIdx,m_stacked->addWidget(new QTextEdit("Child1",this)),Qt::UserRole);


    mdl->insertRow(0,tempIdx);
    QModelIndex tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"ChildOfChidl1");
    QTableWidget* tempTable1 = new QTableWidget(2,2,this);
    tempTable1->model()->setData(tempTable1->model()->index(0,0),"ChildOfChild1 Cell 0,0");
    tempTable1->model()->setData(tempTable1->model()->index(1,0),"ChildOfChild1 Cell" ,0");
    mdl->setData(tempIdx,m_stacked->addWidget(tempTable1),Qt::UserRole);

    mdl->insertRow(0,tempIdx);
    QModelIndex tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"ChildAOfChidl1");
    QTableWidget* tempTable1 = new QTableWidget(2,2,this);
    tempTable1->model()->setData(tempTable1->model()->index(0,0),"ChildOfChild1 Cell 0,0");
    tempTable1->model()->setData(tempTable1->model()->index(1,0),"ChildOfChild1 Cell" ,0");
    mdl->setData(tempIdx,m_stacked->addWidget(tempTable1),Qt::UserRole);

   mdl->insertRow(0,tempIdx);
    QModelIndex tempIdx = mdl->index(0,0,tempIdx);
    mdl->setData(tempIdx,"ChildBOfChidl1");
    QTableWidget* tempTable1 = new QTableWidget(2,2,this);
    tempTable1->model()->setData(tempTable1->model()->index(0,0),"ChildBOfChild1 Cell 0,0");
    tempTable1->model()->setData(tempTable1->model()->index(1,0),"ChildBOfChild1 Cell" ,0");
    mdl->setData(tempIdx,m_stacked->addWidget(tempTable1),Qt::UserRole);

In my case sequence is a issue ChildBOfChild1 is displayed before ChildAOfChild1 why ?