Qt Application gets freezed due to read huge data from SQLite database periodically

Sudo007

i have issues in showing huge data in QTableView ,data read from sqlite database which is being updated dynamically .. 2k rows in 2s.
i am using QSQLRelationModel
let me describe the scenario in detail.

My Qt application has a view i.e QTableView , each row has following structure:

QPushButton|QLabel | QLabel | QLabel *

i have created it using QItemDelegate

each row isinserted dynamicaly , after sometime gui gets freezed.

could anyone tell me the way to fix the issue.

Thanks in advance.

SGaist

Hi and welcome to devnet,

Do I understand correctly that you are creating one widget per column for the 4 columns ? If so, it means that you are trying to create more than 8000 widgets in 2 seconds which isn't exactly efficient and performance friendly.

What is your exact setup ?

Sudo007

hi
I have created a class customDelegate (inherits QItemDelegate) in my Qt applicatrion and i created setEditor() function.But the delegate is not visible in the QTableView , untill i click on the row.
How to fix the issue?

raven-worx

@Sudo007 said:

How to fix the issue?

caching, paging, query optimization, etc. ... but this is a rather generic answer to a generic question.

Sam

@Sudo007 said:

hi
I have created a class customDelegate (inherits QItemDelegate) in my Qt applicatrion and i created setEditor() function.But the delegate is not visible in the QTableView , untill i click on the row.
How to fix the issue?

How did you implement the paint() in your custom delegate ? As you are adding different widget in each cell, you need to paint a fake widget (QPushButton) using QApplication::style()->drawControl(QStyle::CE_PushButton, &btn,painter); where btn is QStyleOptionButton, then in createEditor() you create an instance of QPushButton.