QDirModel - add own items

[heinz32]

Hi,

i need a folderbrowser with QDirModel in my Application, but i need to add my own icons (toplevel as well as subentries) (for network access for example). Is there an easy way to do this?

thank you very much in advance

[wysota]

No, there is no easy way to do that. For a non-trivial solution search the forum - the problem has been raised at least two times before.

[heinz32]

i did search and did not find anything (search terms: Qdirmodel, insert items, insert icons, qtreeview items) - could you point me to the thread(s) please?

[wysota]

Try "subclass QDirModel".

[heinz32]

ah thank you very much , i have found something according to my needs.
if i encounter further problems (which will be most likely the case ) i will ask again

[heinz32]

ok now i subclassed QDirModel::data and QDirModel::rowCount as following:

int MyDirModel::rowCount(const QModelIndex & parent)const
{   
	if(parent == QModelIndex())
	 return QDirModel::rowCount(parent) + 1;
 
return QDirModel::rowCount(parent);
}
 
QVariant MyDirModel::data(const QModelIndex & index, int role)const
{
	if(index.row() == (QDirModel::rowCount(QModelIndex()) + 1))
	{
		if(role == Qt::DisplayRole)
		 return QString(tr("bla"));
 
		if(role == Qt::DecorationRole)
		 return iconProvider()->icon(QFileIconProvider::Desktop);
 
	return QVariant();
	}
 
return QDirModel::data(index, role);
}

int MyDirModel::rowCount(const QModelIndex & parent)const
{   
	if(parent == QModelIndex())
	 return QDirModel::rowCount(parent) + 1;

return QDirModel::rowCount(parent);
}

QVariant MyDirModel::data(const QModelIndex & index, int role)const
{
	if(index.row() == (QDirModel::rowCount(QModelIndex()) + 1))
	{
		if(role == Qt::DisplayRole)
		 return QString(tr("bla"));
    
		if(role == Qt::DecorationRole)
		 return iconProvider()->icon(QFileIconProvider::Desktop);
    
	return QVariant();
	}

return QDirModel::data(index, role);
}

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it does work, however i cannot add an item at the toplevel, only as subentries of other items... I use a treeview to display this, how can i get my item as a toplevel?

edit: the problem seems to be: rowcount isnt called at toplevel
edit 2: it is called... why doesnt it show my additional item then ((

[wysota]

if(index.row() == (QDirModel::rowCount(QModelIndex()) + 1))

if(index.row() == (QDirModel::rowCount(QModelIndex()) + 1))

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should be:

if(index.row() == QDirModel::rowCount(QModelIndex()))

if(index.row() == QDirModel::rowCount(QModelIndex()))

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Rows are numbered from 0 to rowCount()-1 inclusive.

[heinz32]

does not change anything, it now just replaces the ".." (because rowcount returns 1 at toplevel) of every folder with my item but still no extra toplevel item

[wysota]

Because you should check the parent as well

[heinz32]

yes but thats not the problem, it does not add any extra items it just replaces the ones which are already there, if i do the parentcheck nothing happens at all

edit: i did a check, MyDirModel::data is only called for the one regular row there, not for my additional one. how can i tell Qtreeview to request that one?

[heinz32]

ok i think the problem is that i have to subclass index() too, because the treeview does request my additional row there. However, i do not know what to return - if i return an index from another item already existing in Qdirmodel, it adds that one, but if i return my own index created with createIndex, the program just crashes ... is there really no solution for this? i would consider this a very basic requirement but it just wont work