Writing a Tree model.

[kaushal_gaurav]

Hi,

Can anyone help me in writing a Tree model from QStandardItemModel.
I have all the required data in a seperate QStandardItemModel.
i need to create a new Tree model or may be a proxy tree model.
How do i implement a rowCount function for the TreeModel.
I have already gone through SimpleTreeModel example but cound not complete my tree model.

Please do help me with some code snippets...

Regards,
GK

[kaushal_gaurav]

any body....
any idea...

[spirit]

there is an example in Qt Assistant at QStandardItemModel

An example usage of QStandardItemModel to create a tree:

QStandardItemModel model;
QStandardItem *parentItem = model.invisibleRootItem();
for (int i = 0; i < 4; ++i) {
QStandardItem *item = new QStandardItem(QString("item %0").arg(i));
parentItem->appendRow(item);
parentItem = item;
}

also lool at Qt's example QTDIR/examples/itemviews/simpletreemodel/

[kaushal_gaurav]

I have written the followinf code to create a tree.

for (int i = 0; i < m_manufacturerList.count(); ++i)
   {
      QStandardItem *item = new QStandardItem(m_manufacturerList.at(i));
      parentItem = item;
      QList<QString> modelList = m_pPrivate->m_ManufacturerModel.values(item->text());
      parentItem->appendRow(modelList);
 
      for(j = 0; j < modelList.count(); ++j)
      {
         parentItem = modelList.at(i);
         parentItem->appendRow(m_pPrivate->m_ModelBand.values(modelList.at(i)));
      }
   }

for (int i = 0; i < m_manufacturerList.count(); ++i)
   {
      QStandardItem *item = new QStandardItem(m_manufacturerList.at(i));
      parentItem = item;
      QList<QString> modelList = m_pPrivate->m_ManufacturerModel.values(item->text());
      parentItem->appendRow(modelList);

      for(j = 0; j < modelList.count(); ++j)
      {
         parentItem = modelList.at(i);
         parentItem->appendRow(m_pPrivate->m_ModelBand.values(modelList.at(i)));
      }
   }

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I have a list m_manufacturerList which contins some items.
then in have two multi maps..m_ManufacturerModel and m_ModelBand

I need to show data in the list views... see the attachment.

this is something like MAC finder...view...

how do i implement fucntions... rowCount, index(), parent() etc..

Regards,
GK

[kaushal_gaurav]

Hi,

I have done this so far...

TreeModel.h

#ifndef ADD_DEVICES_TREE_PROXY_MODEL_H
#define ADD_DEVICES_TREE_PROXY_MODEL_H
 
#include <QAbstractItemModel>
#include <QModelIndex>
#include <QVariant>
 
class AddDeviceTreeProxyModel : public QAbstractItemModel
{
   Q_OBJECT
 
public:
   AddDeviceTreeProxyModel(QObject *parent = 0);
   ~AddDeviceTreeProxyModel();
 
   QVariant data(const QModelIndex &index, int role) const;
   Qt::ItemFlags flags(const QModelIndex &index) const;
   QModelIndex index(int row, int column,
      const QModelIndex &parent = QModelIndex()) const;
   QModelIndex parent(const QModelIndex &index) const;
   int rowCount(const QModelIndex &parent = QModelIndex()) const;
   int columnCount(const QModelIndex &parent = QModelIndex()) const;
 
private:
   class Private;
   Private* const m_pPrivate;
};
 
#endif // ADD_DEVICES_TREE_PROXY_MODEL_H

#ifndef ADD_DEVICES_TREE_PROXY_MODEL_H
#define ADD_DEVICES_TREE_PROXY_MODEL_H

#include <QAbstractItemModel>
#include <QModelIndex>
#include <QVariant>

class AddDeviceTreeProxyModel : public QAbstractItemModel
{
   Q_OBJECT

public:
   AddDeviceTreeProxyModel(QObject *parent = 0);
   ~AddDeviceTreeProxyModel();

   QVariant data(const QModelIndex &index, int role) const;
   Qt::ItemFlags flags(const QModelIndex &index) const;
   QModelIndex index(int row, int column,
      const QModelIndex &parent = QModelIndex()) const;
   QModelIndex parent(const QModelIndex &index) const;
   int rowCount(const QModelIndex &parent = QModelIndex()) const;
   int columnCount(const QModelIndex &parent = QModelIndex()) const;

private:
   class Private;
   Private* const m_pPrivate;
};

#endif // ADD_DEVICES_TREE_PROXY_MODEL_H

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TreeModel.cpp

#include "TreeModel.h"
#include <QStandardItem>
 
class AddDeviceTreeProxyModel::Private
{
public:
   // Constructor.
   Private( AddDeviceTreeProxyModel* deviceTree )
      : m_AddDeviceTreeProxyModel(deviceTree)
   {
   }
 
   void setupModelData();
   QStringList m_manufacturerList;  // Manufacturer List.
   QMultiMap <QString, QString> m_ManufacturerModel; // Multimap of Manufacturer and Model.
   QMultiMap <QString, QString> m_ModelBand; // Multimap of Model and band.
 
private:
   AddDeviceTreeProxyModel* const m_AddDeviceTreeProxyModel;
};
 
AddDeviceTreeProxyModel::AddDeviceTreeProxyModel(QObject *parent)
   : QAbstractItemModel(parent),
   m_pPrivate( new Private( this ))
{
   for (int i = 0; i < 5 ; ++i)
   {
      m_pPrivate->m_manufacturerList.append(tr("Manf%1").arg(i));
   }
 
   for (int i = 0; i < m_pPrivate->m_manufacturerList.count() ; ++i)
   {
      m_pPrivate->m_ManufacturerModel.insert(tr("Manf%1").arg(i), "Model1");
      m_pPrivate->m_ManufacturerModel.insert(tr("Manf%1").arg(i), "Model2");
   }
 
   for (int i = 0; i < m_pPrivate->m_manufacturerList.count() ; ++i)
   {
      m_pPrivate->m_ModelBand.insert(tr("Model1").arg(i), "Band1");
      m_pPrivate->m_ModelBand.insert(tr("Model1").arg(i), "Band2");
      m_pPrivate->m_ModelBand.insert(tr("Model2").arg(i), "Band1");
      m_pPrivate->m_ModelBand.insert(tr("Model2").arg(i), "Band2");
   }
 
   m_pPrivate->setupModelData();
}
 
AddDeviceTreeProxyModel::~AddDeviceTreeProxyModel()
{
   delete m_pPrivate;
}
 
int AddDeviceTreeProxyModel::columnCount(const QModelIndex &parent) const
{
   return 0;
}
 
QVariant AddDeviceTreeProxyModel::data(const QModelIndex &index, int role) const
{
   return QVariant();
}
 
Qt::ItemFlags AddDeviceTreeProxyModel::flags(const QModelIndex &index) const
{
   return Qt::ItemIsEditable;
 
}
 
QModelIndex AddDeviceTreeProxyModel::index(int row, int column, const QModelIndex &parent) const
{
   return QModelIndex();
}
 
QModelIndex AddDeviceTreeProxyModel::parent(const QModelIndex &index) const
{
   return QModelIndex();
}
 
int AddDeviceTreeProxyModel::rowCount(const QModelIndex &parent) const
{
   return 0;
}
 
void AddDeviceTreeProxyModel::Private::setupModelData()
{
}

#include "TreeModel.h"
#include <QStandardItem>

class AddDeviceTreeProxyModel::Private
{
public:
   // Constructor.
   Private( AddDeviceTreeProxyModel* deviceTree )
      : m_AddDeviceTreeProxyModel(deviceTree)
   {
   }

   void setupModelData();
   QStringList m_manufacturerList;  // Manufacturer List.
   QMultiMap <QString, QString> m_ManufacturerModel; // Multimap of Manufacturer and Model.
   QMultiMap <QString, QString> m_ModelBand; // Multimap of Model and band.

private:
   AddDeviceTreeProxyModel* const m_AddDeviceTreeProxyModel;
};

AddDeviceTreeProxyModel::AddDeviceTreeProxyModel(QObject *parent)
   : QAbstractItemModel(parent),
   m_pPrivate( new Private( this ))
{
   for (int i = 0; i < 5 ; ++i)
   {
      m_pPrivate->m_manufacturerList.append(tr("Manf%1").arg(i));
   }

   for (int i = 0; i < m_pPrivate->m_manufacturerList.count() ; ++i)
   {
      m_pPrivate->m_ManufacturerModel.insert(tr("Manf%1").arg(i), "Model1");
      m_pPrivate->m_ManufacturerModel.insert(tr("Manf%1").arg(i), "Model2");
   }

   for (int i = 0; i < m_pPrivate->m_manufacturerList.count() ; ++i)
   {
      m_pPrivate->m_ModelBand.insert(tr("Model1").arg(i), "Band1");
      m_pPrivate->m_ModelBand.insert(tr("Model1").arg(i), "Band2");
      m_pPrivate->m_ModelBand.insert(tr("Model2").arg(i), "Band1");
      m_pPrivate->m_ModelBand.insert(tr("Model2").arg(i), "Band2");
   }

   m_pPrivate->setupModelData();
}

AddDeviceTreeProxyModel::~AddDeviceTreeProxyModel()
{
   delete m_pPrivate;
}

int AddDeviceTreeProxyModel::columnCount(const QModelIndex &parent) const
{
   return 0;
}

QVariant AddDeviceTreeProxyModel::data(const QModelIndex &index, int role) const
{
   return QVariant();
}

Qt::ItemFlags AddDeviceTreeProxyModel::flags(const QModelIndex &index) const
{
   return Qt::ItemIsEditable;

}

QModelIndex AddDeviceTreeProxyModel::index(int row, int column, const QModelIndex &parent) const
{
   return QModelIndex();
}

QModelIndex AddDeviceTreeProxyModel::parent(const QModelIndex &index) const
{
   return QModelIndex();
}

int AddDeviceTreeProxyModel::rowCount(const QModelIndex &parent) const
{
   return 0;
}

void AddDeviceTreeProxyModel::Private::setupModelData()
{
}

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Main.cpp

#include <QApplication>
#include "TreeModel.h"
#include "ui_Form.h"
 
int main(int argc, char** argv)
{
   QApplication a(argc, argv);
 
   QWidget form;
   Ui::Form ui;
   ui.setupUi(&form);
   form.show();
 
   AddDeviceTreeProxyModel model;
   ui.listView->setModel( &model );
   ui.treeView->setModel( &model );
 
   return a.exec();
}

#include <QApplication>
#include "TreeModel.h"
#include "ui_Form.h"

int main(int argc, char** argv)
{
   QApplication a(argc, argv);

   QWidget form;
   Ui::Form ui;
   ui.setupUi(&form);
   form.show();

   AddDeviceTreeProxyModel model;
   ui.listView->setModel( &model );
   ui.treeView->setModel( &model );

   return a.exec();
}

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Please tell me how do i implement rowCount(), columnCount(), index(), parent() functions....

I am stuck... badly

Regards,
GK

[aamer4yu]

Did you have a look at examples in Qt Demo ??

[kaushal_gaurav]

yes i have seen ... but could not mould it to implement mine funcitons....