adding one icon to all items in QTreeView

[Mystical Groovy]

hey all,
i would like to add one icon to all items in qtreeview

i tried the following:
(listModel is my QDirModel)

int role;
        QIcon modelicon("/images/package.png");
        modelicon.operator QVariant();
        listModel->setData(listModel->index("/home/test/"),modelicon, role = Qt::DecorationRole);

int role;
        QIcon modelicon("/images/package.png");
        modelicon.operator QVariant();
        listModel->setData(listModel->index("/home/test/"),modelicon, role = Qt::DecorationRole);

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int role;
        listModel->setData(listModel->index("/home/test/"),QVariant(QIcon("/images/package.png")), role = Qt::DecorationRole);

int role;
        listModel->setData(listModel->index("/home/test/"),QVariant(QIcon("/images/package.png")), role = Qt::DecorationRole);

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listModel->setData(listModel->index("/home/test/"),QVariant(QIcon("/images/package.png")), Qt::DecorationRole);

listModel->setData(listModel->index("/home/test/"),QVariant(QIcon("/images/package.png")), Qt::DecorationRole);

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the program compiles and runs successfully but it doesnt add my icon in the items in QTreeView, it continues to show the default icon.

[caduel]

i) why do you assign the role to your variable role?
(Looks like you are confused about default values...)

ii) check the return value of setData(); probably it is false.
Not every model supports setting data (or setting any role).


You can subclass QDirModel and have your subclass's data function return that icon for Qt:ecorationRole.

HTH

[Mystical Groovy]

thanks for your reply

youre right im deeply confused im not used to the "model" system yet haha.
can you help me with some example code on how to do this?

thank you

[aamer4yu]

MyModel::data ( const QModelIndex & index, int role = Qt::DisplayRole ) 
{
if(role == Qt::DecorationRole)
     return QIcon(...);
 
// Rest of the code..
}

MyModel::data ( const QModelIndex & index, int role = Qt::DisplayRole ) 
{
if(role == Qt::DecorationRole)
     return QIcon(...);

// Rest of the code..
}

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[Mystical Groovy]

thank you, but the problem remains,
this is the code:

int role;
listModel->data ( listModel->index("/home/test"), role = Qt::DisplayRole );
if(role == Qt::DecorationRole)
   {
      return QIcon("");
    }

int role;
listModel->data ( listModel->index("/home/test"), role = Qt::DisplayRole );
if(role == Qt::DecorationRole)
   {
      return QIcon("");
    }

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it gives me
" error: return-statement with a value, in function returning 'void'"

[Mystical Groovy]

i got it working after all,
problem solved

[aamer4yu]

Can you share what was the mistake ? It might help others