[Qt-interest] Performance of Model and View

[Malyushytsky, Alex]

You can disable update of the widget before changing model using setUpdatesEnabled() and enable it after you done.
This should help with performance.

http://doc.trolltech.com/4.4/qwidget.html#updatesEnabled-prop

Alex



-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of RZ
Sent: Tuesday, January 13, 2009 1:00 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] Performance of Model and View

Hi,

I'm reading data from a file into the model - the (pseudo) code looks
like this:

model->insertRow(0);
model->setData(model->index(0, 0), QString::number(_uint16));
model->setData(model->index(0, 1), QString::number(_uint8));
model->setData(model->index(0, 2), QString::number(_uint16));
model->setData(model->index(0, 3), QString::number(_uint16));
model->setData(model->index(0, 4), QString::number(_uint16));
model->setData(model->index(0, 5), QString::number(_uint8));
model->setData(model->index(0, 6), QString::number(_uint8));
model->setData(model->index(0, 7), QString::number(_uint32));
model->setData(model->index(0, 8), QString::number(_uint16));
for (int i = 0; i < 9; ++i)
{
     model->setData(model->index(0, i), Qt::AlignCenter,
Qt::TextAlignmentRole);
}

model->setData(model->index(0, numColumns - 1),
QString::fromStdString(decoded));
model->item(0, 0)->setFlags(Qt::ItemIsSelectable);
model->setData(model->index(0, 0), Qt::green, Qt::ForegroundRole);
model->setData(model->index(0, 0), ttInfo, Qt::ToolTipRole);
model->setData(model->index(0, 0), type, MsgTypeRole);


With this code I have several problems. First of all it is slow (as it
seems that the view gets updated after every "setData"), second it
doesn't look "cool" (e.g. the for-loop to set the alignement), ...

Is there a way I overlooked to improve this?

Thanks,

RZ
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