I'm using abstractItemModel / my own item, I ensure that columnCount return correct number of columns, yet it's still wrong. In regard to using proxyModels, I'd love to use it, but I only found few examples and I'm struggling as to how I would do it. Any hints wold be great, I would prefer to use a proxy instead here. I literally have no idea how I can simulate setRootIndex with proxyModel, since I need to see parentItem of the item that I wish to set as rootitem and I don't want to see these parent items... here was me early attempt > https://forum.qt.io/topic/102227/qsortfilterproxymodel-simulate-new-root-index/2 @Christian-Ehrlicher I'm totally blaming you for me going this setRootIndex road as I was trying proxy early and you said to use this : p

@smillmorel said in Forward declaration error inside include qtableview.h: Don't really know what happended there, but it did work. There is no magic to it. Some Qt classes only forward declare the classes they use internally. If you use them in your code, you need to include them on your side.

@MrBolton Thanks for replying. Your solution is not what I am looking for, unfortunately. I do not even have a QSortFilterProxyModel. Specifically, I do not want sorting to happen at the client. I wish it to happen at the server with a ORDER BY. My problem, IIRC, is that QTableView::setSortingEnabled(true); QTableView::sortByColumn(col, Qt.DescendingOrder); causes two SQL queries to be sent to the database, one for each line. Reversing the order of the two lines does not help. According to me, it is therefore not possible to enable sorting and pick which column to sort by without executing two queries in a row, which is ridiculously wasteful since we only care about the result of the second query. Users may not even be aware that this is what is happening behind the scenes. There should surely be some way of enabling sorting and specifying the column+direction without issuing two separate queries to the database. Nobody else but me seems to think this is an issue/bad/wrong! I realise this question is now OT. If you would care to share your help on this matter please be kind enough to post in my original thread, https://forum.qt.io/topic/83294/how-to-prevent-qtableview-qtreeview-doing-query-sorting-multiple-times. Thank you.

@mmikeinsantarosa Hi just to be clear You do not name the parameter when using a function in a connect. Nor for signal OR the slot. So if you function is like void MySlot( int ID, QString Name) ( in .h and cpp) you would only use as MySlot( int, QString) for connect.

Glad you found a solution ! Can you share a small sample code that triggers this behaviour ?

@raven-worx Hi, thanks for your reply and information. Will mark it as "solved", as it is only a minor but interesting styling "issue" :)

@thEClaw Well, since you were worried about how clean your solution was, I thought I should come up with a nastier hack: -): I'm storing the ints in my map as negative numbers and then I retrieve the "real" numbers in the model's data() method like this: ... if (item.column() == 2) { int fake = recordsMap.keys().at(item.row()); return abs(fake); } ... At least everything works and displays fine now. I fiddled a lot with visualIndex() and logicalIndex() but couldn't find a way to make this work, so I'm keeping this for the time being. Thanks anyway for your suggestion!

Further investigation into the issue has revealed that HiearchicalHeaderView re-implements the header views sections, and there is no relationship between the QHeaderView notion of sections, and the HiearchicalHeaderView notion of sections. As a result, the following calls are available, but return incorrect data. QHeaderView::count() returns 0 QHeaderView::sectionSize(int) returns 0 QHeaderView::logicalIndex(int) returns -1 etc... The upshot of this is that there is a significant amount of work required in HierarchicalHeaderView in order to make in feature complete, and that the way it is currently implemented is not symbiotic with QHeaderView That essentially leaves 2 questions. Does an open source feature-complete hierarchical header view exist? Is there a way to easily implement hierarchical headers in a QHeaderView?

Hi, You can try with the QHeaderView::minimumSectionSize property

HI, No it's not. You have the explanation here

@AlaaM Hello, How do I get it to be fixed? Maybe it needs to not be a part of the scrollarea? This would be my choice, yes. I'd put the header and the scroll area in a vertical layout (setting the stretches to 0 for the header and 1 for the scroll area) and take it from there. Kind regards.

You're welcome ! You can also check in your profile settings whether the email notification is active. Since you have it working now, please mark the thread as solved using the "Topic Tool" button so that other forum users may know a solution has been found :)

Technically the "last number of columns" is rather a model specific data. Since that part can change, the model should check the last value and then emit the signal accordingly. The section ordering part, on the other hand, is indeed view specific data and the model shouldn't do anything with them.

Got a solution for that question by myself. The solution works also for right aligned text. void MyHeaderView::paintSection(QPainter* painter, const QRect& rect, int logicalIndex) const { // The Icon to draw on right of the header text is in iconPixmap QRect iconRect = iconPixmap.rect(); QRect textRect = rect; textRect.setWidth(textRect.width() - iconRect.width()); QFont myFont = getFont(); // delivers the font for for the header text QFontMetrics fontMetrics(myFont); // determine the elided text which will be printed for the available width // m_header_padding is the padding of the headerview section QString elidedText = fontMetrics.elidedText(text, Qt::ElideRight, textRect.width() - m_header_padding * 2); // Drawing procedure // First draw without text over the complete header section size // this will draw the background and the borders etc. for the complete header section model() -> setHorizontalHeaderText(index, QString()); // set text in model without emitting datachanged QHeaderView::paintSection(painter, rect, logicalIndex); // now draw the (possibly elided) text into the header section model() -> setHorizontalHeaderText(logicalIndex, elidedText); QHeaderView::paintSection(painter, textRect, logicalIndex); // Now restore the header section text in the model model() -> setHorizontalHeaderText(logicalIndex, text); // Draw the icon // center icon vertical int iconHeight = iconRect.height(); int headerHeight = rect.height(); int offset = 0; if (iconHeight < headerHeight) { offset = (headerHeight - iconHeight) / 2; } painter -> setClipRect(rect); painter -> drawPixmap(textRect.right()-1, rect.top() + offset, iconRect.width(), iconRect.height(), iconPixmap); painter -> setClipRect(rect); }

@maximo Hi It creates a new Header that draws a check box image on itself since its not possible to insert a real widget. It then response to mouse press to make the image work as a real check box. it checks with if (logicalIndex == 0) so I think it only paints this in first column.

Hi asmirn I think I have a solution regarding your question. You have to implement the resize mechanism by yourself as the QTableView / QHeaderView will not support the resizing by itself. The way i did: First derive a subclass from QHeaderView (e.g. VerticalHeaderView) and override the mousePressEvent / mouseMoveEvent / mouseReleaseEvent, to get the relevant mouseclicks mousemove-positions for the headerview. Then if the user clicks the left mouse button in a certain distance to the left VerticalHeaderView border you can start resizing the VerticalHeaderView with setFixedWidth(newWidth). Do not forget to tell the according QTableView/QTableWidget about the resizing by calling updateGeometries() for the QTableView/QTableWidget.

Oh, I see. Thank you sir.

@SGaist Hi SGaist! Thanks for reply! I had tried this and it will result in static controls being placed on header. Upon Horizontal scroll to right/left, it will appear immovable. Thanks for the info though!