Updating Scrollbar QTableView when model shrink

[Misty River]

Hello,

I have a model that dynamically shrinks and grows depending on user inputs and it is display in a tableview... the problem I'm having is that the scrollbars are never updated... they are set to the size of the data when I call setModel().. but when the model shrinks I can still scroll past the new smaller data... I've tried calling reset() and update() on the tableview but it has no effect on the scrollbar... How can I update the scrollbar so that it doesn't go past the size of the data??

[SGaist]

Hi,

Sounds like a glitch, what version of Qt are you using ? On which platform ?

[Misty River]

@SGaist I'm using the latest version of Qt on windows 10

[alex_malyu]

If you are using custom model, it mostly likely a sign that model does not call appropriate required functions which are used for notification about data changes.

[Misty River]

@alex_malyu Yes, it is a custom model... and you are right I do not call any function when I change the data... I simply have a setter function that sets the model data... how should I go about changing the data??

[Misty River]

@alex_malyu The custom model derives from QAbstractTableModel btw...

[alex_malyu]

look at:
https://doc.qt.io/archives/4.6/model-view-creating-models.html
and
http://doc.qt.io/qt-5/qabstractitemmodel.html

functions of interest typically start with begin...., end...
like:
void beginInsertRows(const QModelIndex & parent, int first, int last)
void beginRemoveRows(const QModelIndex & parent, int first, int last)
void beginResetModel()
....