Storing Directory hierarchy in Datastructure Qt - c++

Question

How should i store data which is going into a TreeView? A Dictionary (QHash)? Plain Text? JSON?
My Hierarchy would be something like:
{
'Cloth': {
'Tissue':None,
'Leather': {
'Bandage': None
}
},
'Smoke': {
'White':{
'Smallscale': None,
'Largescale':None
}
}
}
Actions:
When I click a leaf-Element it will retrieve the Fullpath, like "Smoke/White/Smallscale" and this will be used as a key to place a SQL-Query.
I would use QStandardItem for every entry and when clicked, I would recursively call their parents, till I hit root.
Any thoughts?

Answer 1

Do you know QJsonTreeWidget?
Of course you don't need to use that library, but I do think you should use JSON in any case. It's almost a standard nowadays and very useful when we're working with trees.
Boost also has a wonderful library to work with JSON.

Answer 2

You can use one of the json library (like cajun) to parse json file.
This is the Qt part:
#include <QtGui>
#include <QTreeView>
class SimpleTreeView :public QTreeView
{
Q_OBJECT
public:
SimpleTreeView(QWidget *parent = 0);
public slots:
void slot_item_clicked(const QModelIndex &idx);
private:
QStandardItemModel *model;
};
#include <simpletreeview.h>
#include <qmessagebox.h>
#include <qobject.h>
SimpleTreeView::SimpleTreeView(QWidget *parent) : QTreeView(parent)
{
model = new QStandardItemModel(2,1);
QStandardItem *item1 = new QStandardItem("Cloth");
QStandardItem *item2 = new QStandardItem("Smoke");
model->setItem(0, 0, item1);
model->setItem(1, 0, item2);
QStandardItem *item3 = new QStandardItem("White");
item2->appendRow(item3);
QStandardItem *leaf = new QStandardItem("Smallscale");
leaf->setData("Smoke/White/Smallscale");
item3->appendRow(leaf);
setModel(model);
connect(this, SIGNAL(clicked(const QModelIndex &)), this, SLOT(slot_item_clicked(const QModelIndex &)));
}
void SimpleTreeView::slot_item_clicked(const QModelIndex & idx)
{
QString strData = model->itemFromIndex(idx)->data().toString();
QMessageBox::information(NULL, "Title", strData, QMessageBox::Yes, QMessageBox::Yes);
}
// main.cpp
#include <QApplication>
#include <simpletreeview.h>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
SimpleTreeView view;
view.show();
return app.exec();
}