Get Row of specific QTreeWidgetItem in my QWidgetTree

**Santosh Reddy** · 27th March 2017, 08:33

Here is an example, see if this is what you want. Click the item and it's row number will appear above.

Qt Code:

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#include <QtWidgets>
// TreeWidget.h
class TreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit TreeWidget(QWidget * parent = 0)
        : QTreeWidget(parent)
    {
        setColumnCount(1);
        AddItems();
        setSortingEnabled(true);
        connect(this, SIGNAL(clicked(QModelIndex)), SLOT(evalRow(QModelIndex)));
    }
 
signals:
    void selectedRowChanged(const QString & row);
 
private slots:
    void evalRow(const QModelIndex & index)
    {
        QString row = "<not selected>";
        QAbstractItemModel * m = model();
 
        if(m)
            row = QString::number(countRow(index));
 
        emit selectedRowChanged(row);
    }
 
private:
    int countRow(const QModelIndex & index)
    {
        int count  = 0;
 
        if(index.isValid())
        {
            count = (index.row() + 1) + countRow(index.parent());
 
            const QModelIndex parent = index.parent();
            if(parent.isValid())
            {
                for(int r = 0; r < index.row(); ++r)
                    count += model()->rowCount(parent.child(r, 0));
            }
        }
 
        return count;
    }
 
    void AddItems()
    {
        QTreeWidgetItem * root      = new QTreeWidgetItem(QStringList() << "root");
        QTreeWidgetItem * sub_1     = new QTreeWidgetItem(QStringList() << "sub_1");
        QTreeWidgetItem * sub_1_1   = new QTreeWidgetItem(QStringList() << "sub_1_1");
        QTreeWidgetItem * sub_1_2   = new QTreeWidgetItem(QStringList() << "sub_1_2");
        QTreeWidgetItem * sub_2     = new QTreeWidgetItem(QStringList() << "sub2");
        QTreeWidgetItem * sub_3     = new QTreeWidgetItem(QStringList() << "sub3");
 
        root->addChild(sub_1);
        root->addChild(sub_2);
        root->addChild(sub_3);
 
        sub_1->addChild(sub_1_1);
        sub_1->addChild(sub_1_2);
 
        addTopLevelItem(root);
    }
};

#include <QtWidgets>
// TreeWidget.h
class TreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit TreeWidget(QWidget * parent = 0)
        : QTreeWidget(parent)
    {
        setColumnCount(1);
        AddItems();
        setSortingEnabled(true);
        connect(this, SIGNAL(clicked(QModelIndex)), SLOT(evalRow(QModelIndex)));
    }

signals:
    void selectedRowChanged(const QString & row);

private slots:
    void evalRow(const QModelIndex & index)
    {
        QString row = "<not selected>";
        QAbstractItemModel * m = model();

        if(m)
            row = QString::number(countRow(index));

        emit selectedRowChanged(row);
    }

private:
    int countRow(const QModelIndex & index)
    {
        int count  = 0;

        if(index.isValid())
        {
            count = (index.row() + 1) + countRow(index.parent());

            const QModelIndex parent = index.parent();
            if(parent.isValid())
            {
                for(int r = 0; r < index.row(); ++r)
                    count += model()->rowCount(parent.child(r, 0));
            }
        }

        return count;
    }

    void AddItems()
    {
        QTreeWidgetItem * root      = new QTreeWidgetItem(QStringList() << "root");
        QTreeWidgetItem * sub_1     = new QTreeWidgetItem(QStringList() << "sub_1");
        QTreeWidgetItem * sub_1_1   = new QTreeWidgetItem(QStringList() << "sub_1_1");
        QTreeWidgetItem * sub_1_2   = new QTreeWidgetItem(QStringList() << "sub_1_2");
        QTreeWidgetItem * sub_2     = new QTreeWidgetItem(QStringList() << "sub2");
        QTreeWidgetItem * sub_3     = new QTreeWidgetItem(QStringList() << "sub3");

        root->addChild(sub_1);
        root->addChild(sub_2);
        root->addChild(sub_3);

        sub_1->addChild(sub_1_1);
        sub_1->addChild(sub_1_2);

        addTopLevelItem(root);
    }
};

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Qt Code:

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// main.cpp
#include "TreeWidget.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    QLabel * label = new QLabel;
    TreeWidget * treeWidget = new TreeWidget;
 
    QWidget mainWidget;
 
    QVBoxLayout * layout = new QVBoxLayout(&mainWidget);
    layout->addWidget(label);
    layout->addWidget(treeWidget);
 
    QObject::connect(treeWidget, SIGNAL(selectedRowChanged(QString)), label, SLOT(setText(QString)));
 
    mainWidget.show();
 
    return app.exec();
}

// main.cpp
#include "TreeWidget.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QLabel * label = new QLabel;
    TreeWidget * treeWidget = new TreeWidget;

    QWidget mainWidget;

    QVBoxLayout * layout = new QVBoxLayout(&mainWidget);
    layout->addWidget(label);
    layout->addWidget(treeWidget);

    QObject::connect(treeWidget, SIGNAL(selectedRowChanged(QString)), label, SLOT(setText(QString)));

    mainWidget.show();

    return app.exec();
}

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**PeterSilie** · 27th March 2017, 10:15

Originally Posted by Santosh Reddy

Here is an example, see if this is what you want. Click the item and it's row number will appear above.

Well works kinda the same way as the solution i posted already, means that the same problem with the ordering of the items occurs again.

Somehow the algorithm to calculate the row / index of the item must consider the ordering of the items displayed (different columns like label, path, etc. used to (re-)order the items in the treewidget) and neither my solution nor your solution does this

But still thx alot for spending your time to help me out with this issue, hope that we will find a working solution for this somehow.

**Santosh Reddy** · 27th March 2017, 10:21

Originally Posted by PeterSilie

Somehow the algorithm to calculate the row / index of the the item must consider the ordering of the items displayed and neither my solution nor your solution does this

Are you sure, did you run the code I posted. It considers the new sorting order, just re-sort and click the item again. Refresh may be an issue....

Anyway, you could connect to sort indicator and refresh the index row number, by storing the persistent index

Qt Code:

Switch view

#include <QtWidgets>
 
class TreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit TreeWidget(QWidget * parent = 0)
        : QTreeWidget(parent)
    {
        setColumnCount(1);
        AddItems();
        setSortingEnabled(true);
        connect(this, SIGNAL(clicked(QModelIndex)), SLOT(evalRow(QModelIndex)));
        connect(this->header(), SIGNAL(sortIndicatorChanged(int,Qt::SortOrder)), SLOT(sorted()));
    }
 
signals:
    void selectedRowChanged(const QString & row);
 
private slots:
    void evalRow(const QModelIndex & index)
    {
        QString row = "<not selected>";
        QAbstractItemModel * m = model();
 
        if(m)
        {
            row = QString::number(countRow(index));
            mIndex = index;
        }
 
        emit selectedRowChanged(row);
    }
 
    void sorted()
    {
        evalRow(mIndex);
    }
 
private:
    QPersistentModelIndex mIndex;
 
    int countRow(const QModelIndex & index)
    {
        int count  = 0;
 
        if(index.isValid())
        {
            count = (index.row() + 1) + countRow(index.parent());
 
            const QModelIndex parent = index.parent();
            if(parent.isValid())
            {
                for(int r = 0; r < index.row(); ++r)
                    count += model()->rowCount(parent.child(r, 0));
            }
        }
 
        return count;
    }
 
    void AddItems()
    {
        QTreeWidgetItem * root      = new QTreeWidgetItem(QStringList() << "root");
        QTreeWidgetItem * sub_1     = new QTreeWidgetItem(QStringList() << "sub_1");
        QTreeWidgetItem * sub_1_1   = new QTreeWidgetItem(QStringList() << "sub_1_1");
        QTreeWidgetItem * sub_1_2   = new QTreeWidgetItem(QStringList() << "sub_1_2");
        QTreeWidgetItem * sub_2     = new QTreeWidgetItem(QStringList() << "sub2");
        QTreeWidgetItem * sub_3     = new QTreeWidgetItem(QStringList() << "sub3");
 
        root->addChild(sub_1);
        root->addChild(sub_2);
        root->addChild(sub_3);
 
        sub_1->addChild(sub_1_1);
        sub_1->addChild(sub_1_2);
 
        addTopLevelItem(root);
    }
};

#include <QtWidgets>

class TreeWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit TreeWidget(QWidget * parent = 0)
        : QTreeWidget(parent)
    {
        setColumnCount(1);
        AddItems();
        setSortingEnabled(true);
        connect(this, SIGNAL(clicked(QModelIndex)), SLOT(evalRow(QModelIndex)));
        connect(this->header(), SIGNAL(sortIndicatorChanged(int,Qt::SortOrder)), SLOT(sorted()));
    }

signals:
    void selectedRowChanged(const QString & row);

private slots:
    void evalRow(const QModelIndex & index)
    {
        QString row = "<not selected>";
        QAbstractItemModel * m = model();

        if(m)
        {
            row = QString::number(countRow(index));
            mIndex = index;
        }

        emit selectedRowChanged(row);
    }

    void sorted()
    {
        evalRow(mIndex);
    }

private:
    QPersistentModelIndex mIndex;

    int countRow(const QModelIndex & index)
    {
        int count  = 0;

        if(index.isValid())
        {
            count = (index.row() + 1) + countRow(index.parent());

            const QModelIndex parent = index.parent();
            if(parent.isValid())
            {
                for(int r = 0; r < index.row(); ++r)
                    count += model()->rowCount(parent.child(r, 0));
            }
        }

        return count;
    }

    void AddItems()
    {
        QTreeWidgetItem * root      = new QTreeWidgetItem(QStringList() << "root");
        QTreeWidgetItem * sub_1     = new QTreeWidgetItem(QStringList() << "sub_1");
        QTreeWidgetItem * sub_1_1   = new QTreeWidgetItem(QStringList() << "sub_1_1");
        QTreeWidgetItem * sub_1_2   = new QTreeWidgetItem(QStringList() << "sub_1_2");
        QTreeWidgetItem * sub_2     = new QTreeWidgetItem(QStringList() << "sub2");
        QTreeWidgetItem * sub_3     = new QTreeWidgetItem(QStringList() << "sub3");

        root->addChild(sub_1);
        root->addChild(sub_2);
        root->addChild(sub_3);

        sub_1->addChild(sub_1_1);
        sub_1->addChild(sub_1_2);

        addTopLevelItem(root);
    }
};

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**PeterSilie** · 27th March 2017, 12:14

Originally Posted by Santosh Reddy

Are you sure, did you run the code I posted. It considers the new sorting order, just re-sort and click the item again. Refresh may be an issue....

Well no i did not run your code, i just used the countRow-function in my code
that is what i really need, the rest is not neccessary for me since i am not using this function for an item which gets clicked, it should be applicabale for any item whether is is selected or not.

With your code my index function looks like this now:

Qt Code:

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int indexOfItem(QTreeWidgetItem* item){
     QModelIndex index = indexFromItem(item);
     return countRow(index);
}

int indexOfItem(QTreeWidgetItem* item){
     QModelIndex index = indexFromItem(item);
     return countRow(index);
}

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But as i said it still does not consider the current sorting in the qtreewidget

**Santosh Reddy** · 27th March 2017, 12:34

Originally Posted by PeterSilie

But as i said it still does not consider the current sorting in the qtreewidget

Yes it does work, trying running the code as is.

Changing the sorting order automatically changes the row number.

Screen Shot 2017-03-27 at 4.58.36 PM.png
Screen Shot 2017-03-27 at 4.58.54 PM.png
Screen Shot 2017-03-27 at 4.59.02 PM.png

**PeterSilie** · 28th March 2017, 09:16

Originally Posted by Santosh Reddy

Yes it does work, trying running the code as is.

Changing the sorting order automatically changes the row number.

Screen Shot 2017-03-27 at 4.58.36 PM.png
Screen Shot 2017-03-27 at 4.58.54 PM.png
Screen Shot 2017-03-27 at 4.59.02 PM.png

Ok it is working now, had to clean and rebuild my project in order to make it work.

Thx alot

**PeterSilie** · 30th March 2017, 14:57

Just in case somebody search for the same stuff again
here is my solution:

Qt Code:

Switch view

int rowsBelowIndex(const QModelIndex & index) {
	int count = 0;
	const QAbstractItemModel* model = index.model();
	int rowCount = model->rowCount(index);
	count += rowCount;
	for (int r = 0; r < rowCount; ++r)
		count += rowsBelowIndex(model->index(r, 0, index));
	return count;
 
}
 
int calculateRow(const QModelIndex & index) {
	int count = 0;
	if (index.isValid()) {
		count = (index.row()) + calculateRow(index.parent());
 
		const QModelIndex parent = index.parent();
		if (parent.isValid()) {
			++count;
			for (int r = 0; r < index.row(); ++r)
				count += rowsBelowIndex(parent.child(r, 0));
 
		}
	}
 
	return count;
}
 
 
int indexOfItem(QTreeWidgetItem* item) {
	QModelIndex index = indexFromItem(item);
	return calculateRow(index);
}

int rowsBelowIndex(const QModelIndex & index) {
	int count = 0;
	const QAbstractItemModel* model = index.model();
	int rowCount = model->rowCount(index);
	count += rowCount;
	for (int r = 0; r < rowCount; ++r)
		count += rowsBelowIndex(model->index(r, 0, index));
	return count;

}

int calculateRow(const QModelIndex & index) {
	int count = 0;
	if (index.isValid()) {
		count = (index.row()) + calculateRow(index.parent());

		const QModelIndex parent = index.parent();
		if (parent.isValid()) {
			++count;
			for (int r = 0; r < index.row(); ++r)
				count += rowsBelowIndex(parent.child(r, 0));

		}
	}

	return count;
}


int indexOfItem(QTreeWidgetItem* item) {
	QModelIndex index = indexFromItem(item);
	return calculateRow(index);
}

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