@Jkimmy Thank you for your help.

Ok. I've found the answer. I subclass the QTreeView and override the void resizeEvent(QResizeEvent* e) as shown: void MyTreeView::resizeEvent(QResizeEvent *e) { if(model() != Q_NULLPTR){ model()->layoutChanged(); } QTreeView::resizeEvent(e); } And it did the trick. Had help from the Voidrealms Facebook group.

Besides what @Rondog mentions, you could also read about layouts http://doc.qt.io/qt-5.5/designer-layouts.html If you assign a layout to the window, and put the tab in it, Qt can then automatically adjust the size if user resize the window. It takes a little bit to learn layouts but the reward is great.

@mrjj Oh thank you very much. It's a good thing to learn!

@morte What do you mean by not draws ? See if you get updated height inside the Component.

Well I found a solution. I post here so maybe it helps somebody. You need to declare a global property which stores the height. For example : reViewHeight Put the ListView inside a transparent Rectangle: rcView, and put the rectangle inside the ScrollView Add: Component.onCompleted: { reViewHeight = reViewHeight + height} in your delegate definition In the ListView add: onCountChanged: { rcView.height = reViewHeight } Done !