QAbstractTreeModel & dataChanged()

[tntcoda]

Hi,

I'm trying to update a QTreeView control when data inside its model is changed. I don't mean edited from the control directly, but instead either changed or added to the model from another point in the program.

So in my QAbstractTreeModel I have

void queue::addJob(...)
{
...
// Update model data
 
    QModelIndex x = this->index(jobs.size(), 0, QModelIndex());
    QModelIndex y = this->index(jobs.size(), 5, QModelIndex());
 
    // Update the new row
    emit dataChanged(x, y);
}

void queue::addJob(...)
{
...
// Update model data

    QModelIndex x = this->index(jobs.size(), 0, QModelIndex());
    QModelIndex y = this->index(jobs.size(), 5, QModelIndex());

    // Update the new row
    emit dataChanged(x, y);
}

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This however does nothing when data is added to the model. I have implemented: rowCount(), columnCount(), headerData() and data().

Please could someone tell me what im doing it wrong, do I have to implement setData()? Do I have to call insertRows() to add a new row, or does rowCount do this job for me?

emit reset() works, but thats clearly an inefficient approach with lots of data.

Many thanks,

Jack

[shentian]

You have to call QAbstractItemModel::beginInsertRows() before you start adding your data and QAbstractItemModel::endInsertRows() afterwards:

void queue::addJob(...)
{
  beginInsertRows(...);
  // Update model data
  endInsertRows(); 
}

void queue::addJob(...)
{
  beginInsertRows(...);
  // Update model data
  endInsertRows(); 
}

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[tntcoda]

Thanks very much, works perfectly now.