How to show progess in a QTreeView item ?

[wysota]

No, you just shouldn't implement a custom style only to make very small changes if those changes can be made using simpler methods. Especially that QItemDelegate doesn't use the style directly, so you will be doing double work. I suggest you just implement a delegate and do your custom drawing there with or without using QStyle.

[THRESHE]

Any examples how to do that ?

[wysota]

Search the forum. There are numerous threads about delegates here.

[THRESHE]

And how is ItemDelegate repainted by force ?

[wysota]

What do you mean? The view calls the delegate when it needs to update some part of its viewport. If you want to force a redraw, just update() the viewport (whole or part of it).

[THRESHE]

Where do I get viewport to update ?

[wysota]

From the view

[THRESHE]

Is it so hard to answer more widely?

If I do so will it repaint my delegate ?

QTableWidget* tableWidget = new QTableWidget(this);
ItemDelegate delegate  = new ItemDelegate(tableWidget);
tableWidget->setItemDelegateForColumn(4, delegate);
..........................................................
..........................................................
tableWidget->update();

QTableWidget* tableWidget = new QTableWidget(this);
ItemDelegate delegate  = new ItemDelegate(tableWidget);
tableWidget->setItemDelegateForColumn(4, delegate);
..........................................................
..........................................................
tableWidget->update();

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Thanks in advance

[wysota]

No, it won't repaint your delegate, it will repaint your view. The delegate can't be "repainted", it is nothing visual, it's strictly a helper object that does some work on behalf of the view.

[THRESHE]

Ok Will it repaint my progressbar ? Or will it call ItemDelegate:: paint() ?

[wysota]

It depends If nothing in the item changed, the view might not call the delegate (especially if the item is currently not visible), but in general case - yes, it will call your delegate's paint method.

[THRESHE]

In my case it doesn't want to update

Could you suggest any other solutions ?

[wysota]

What exactly is your usecase? What exactly did you do and what do you want to achieve?

[THRESHE]

The thing is that I have a fancy progressbar that changes its colour depending on the state of download and when I start download the color doesn't change
It looks like on the first screenshot though it should look like on the second

[wysota]

Do you update the values in the items?

[THRESHE]

Do you update the values in the items?

What values and where ? Did not understand at all

[wysota]

Where do you keep the progress then?

[THRESHE]

I keep all needed values in my class that handles downloading called DownloadHolder

[wysota]

What's the point of having the view then? You should really keep those in the model or in the items. That's the whole point of having the view in the first place. Oh... and your delegate would work correctly. I suggest you read this whole thread again, it probably has some code to show you how to get a more or less complete solution.

[THRESHE]

What's the point of having the view then?

The purpose is displaying progress not handling logics