@SGaist You are, as usual, right and I am the absolute moron :D I forgot to take into the account starting point of the cell in paint... Too much time has passed since I had to write the delegate it seems. The solution of the problem was correcting the drawPixamp starting point (add opt.rec.x() and opt.rect.y() respectively): painter-drawPixmap(QPoint(opt.rect.x()+opt.rect.width()/2,opt.rect.y()+opt.rect.height()/3),px.scaled(opt.rect.width(),opt.rect.height()/2,Qt::KeepAspectRatio,Qt::SmoothTransformation)); Thank you for this quick reminder! Cheers, A.

@vinaygopal "what if i want to access the visibility or a property i have defined in the delegate?" There are multiple instances of your delegate, corresponding to the part of the model being displayed. Which instance do you want the property from? If it's a common property that is not specific to a single instance, then the same answer applies - factor it out to the table level and use it in the delegate. If it is a property specific to a delegate instance you are interested in, how do you specify which delegate? Does the data actually belong to the model? What is it that you are trying to achieve?

@fcarney Got it thank you so much :)

The model should provide this information for you. Create a role in the model which will return the correct value for any given cell. On QML side, just access that role and display it directly. No need for any get() method (which, by the way, is called data() https://doc.qt.io/qt-5/qabstractitemmodel.html#data, not get()).

@VRonin Aha, that has got to be it - thank you very much! Sounds like I just need to add a new eventfilter that does nothing but eat keypress events.

You should not want that. Delegates are only a visual representation of the model, and ListView is designed to only show (and instantiate) what the user needs to see. Forcing it to show everything will decrease performance. If you definitely need to generate UI for all elements in a model, use Repeater.

@GrecKo , I mean without the button, when I edit the values of TextEdit, I should be able to get the modified text. I tried via property. It always gave me empty

@gabor53 i meant create a new custom property only for your purpose.

@jeanmilost I can't answer all your questions, as I'm not an expert on Qt's Model/View system, what I do know is, that all models have a QAbstractItemModel as base model and that is also the ABI for all views. For that reason alone, you can assign all models to all views. You will however not get a useful representation of all your data in all views. As I understand it, and anyone fell me to correct me here, the other higher level classes of models are only there to make your life easier, as in you do not have to implement all functions/functionalities of the whole AbstractItemModel class

@VRonin Thanks. It worked. We have used delegates because we have combobox, lineedit also. So we have put check for combobox, not to update via delegate.

@gde23 said in QSlider as QStyledItemDelegate: moving slider requires additional mouseclick: So is there a way the slider can be grabbed directly from the first click? Currently not, no - the first click is the edit trigger.

It really works! Thank you, IntruderExcluder, GrecKo.

Cool, that's what I was looking for.

I eventually managed to fix this by implementing updateEditorGeometry and calling editor->setGeometry(option.rect);. I should have looked into base class member functions sooner!

Ok, I have figured it out by myself. The key was looking at the comboBoxModel->data and getting the index from rows and coloumns. That's my solution: void comboBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model, const QModelIndex &index) const { if(QComboBox *cb = qobject_cast<QComboBox*>(editor)) { QString cbText = cb->currentText(); int vpe_index = -1; for (int row = 0; row < comboBoxModel->rowCount() ; row++) { if (comboBoxModel->data(comboBoxModel->index(row, 0)) == cbText){ vpe_index = comboBoxModel->data(comboBoxModel->index(row, 1)).toInt(); } } if (vpe_index == -1) { qDebug() << "Index not found"; } else { qDebug() << "Index set: " << model->setData(index, vpe_index, Qt::EditRole); } } else { QStyledItemDelegate::setModelData(editor, model, index); } }

@JonB Thank you for your explanation. I understand what i need to do, but i need a little help in making the right signals and slots. My project was setup using the "Using C++ Models in QML {tutorial}" as a guide. here the ToDoList class is set as the data in ToDoListModel class. In the ToDoList Calss there are: 1.appendItem() function, which emits the signals preItemAppended() and postItemAppended() 2.removeItem() funciton, which emits the signals preItemRemoved() and postItemRemoved() [these work fine] 3.similar to the appendItem() and removeItem() I am trying to make a setItemAt() function that will modify the existing data. but there was no steps in the tutorial to indicate how i could notify the model to emit the dataChanged() signal. I tried making my own signal in the data class and a slot in model class but i couldn't figure out how to connect them. the main function has a ToDoList object but no ToDoListModel object (ToDoListModel is just registered to qml). i am only familiar with using the connect(*sender,signal,*receiver, slot) function to connect. I suspect that it has something to do with the 'Q_PROPERTY(ToDoList *list READ list WRITE setList NOTIFY listChanged)' line in the ToDoListModel header file. following the tutorial I removed the NOTIFY listChanged part. summary:which signal do i need to emit from the data class(ToDoList) to have the model class (ToDoListModel) emit the dataChanged() signal?

ok, the template solution is also working here. Thanks a lot for your help!

Actually, since the base class already has a virtual destructor you can just remove the destructor of your derived altogether

I'm doing something similar in sort of objects property tree. It works pretty well for large number of items. Definitely a massive win over a widget per item approach. One difference to your approach is that I don't use grab(), but instead have the editors created by the delegate a static drawing function that uses QStyle::drawControl and friends to draw an image of itself. This is because I don't want to instantiate all the editor widgets upfront to grab them (I have a bunch of them and it takes time). It's sort of a trade-off because it can get out of sync with the actual widget look. Whether this is something you'd be interested in or not is up to you, but the general idea of drawing an image is a valid one.

Hi Mr @VRonin suggested we looked at http://doc.qt.io/qt-5/qabstractscrollarea.html#maximumViewportSize so maybe yo u need to subclass view and return full area.

Did you already checked the bug report system to see if there was something related ? If not, please consider opening a new report providing a minimal compilable example showing the behaviour.

I made a small update on the code. In the delegate I reworked the highlight section: QAbstractTextDocumentLayout::PaintContext ctx; QRect textRect = style->subElementRect(QStyle::SE_ItemViewItemText, &optionV4); painter->save(); painter->translate(textRect.topLeft()); painter->setClipRect(textRect.translated(-textRect.topLeft())); // Highlighting text if item is selected if (optionV4.state & QStyle::State_Selected){ ctx.palette.setColor(QPalette::Text, optionV4.palette.color(QPalette::Active, QPalette::HighlightedText)); QStyleOptionViewItem toolTip = option; initStyleOption(&toolTip, index.sibling(index.row(),2)); QToolTip::showText(QPoint(textRect.right() + 15, textRect.top()), toolTip.text ); } doc.documentLayout()->draw(painter, ctx); painter->restore(); This gives me a nice tool tip but not at the right location. I want it next to the completer but I cannot figure out how to get the coordinates. Since the delegate is not a widget I cannot use this->maptoglobal(). Any ideas on how I could position the tool tip next to the highlighted element?

@6thC did your application consist of a tree and you could apply a delegate to specific items? because that's where I'm stuck now. I am still researching on how to connect QML with C++ and as usual if I figured out a way of applying delegates to specific items based on a logical condition (like your warning and maximum states), I will let you know. Thanks for your time bro!

Great ! What did you implement ? Also, since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum uses may know a solution has been found :)

@VRonin hey it works. I created a separate qt project and it's working there. I will see if I am doing something wrong in my project. Actually the row to which I am trying to set a background color also has some color set to it in table widget stylesheet. Also tablewidget items also have a background color. I will check there. Thanks again.

@tamlong0205 I think most of this can be done from C++ side. You can add a function in the model which can return what type is the data for current index. This function will be called from QML and depending upon its value use a Loader to load the specific delegate. Perhaps setting currentIndex in Component.onCompleted handler ? Create a C++ function which will store in info in the model itself i.e When you change the index in ComboBox call this function and update the value there and may be maintain a role to store this update.

Any reason why you can't use QStandardItemModel? in that case subclass QStyledItemDelegate and reimplement paint void QStyledItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const { Q_ASSERT(index.isValid()); QStyleOptionViewItem opt = option; initStyleOption(&opt, index); ///////////////////////////////////// // Set the background based on the content if(index.data().toInt()==1) opt.backgroundBrush = QBrush(Qt::red); ///////////////////////////////////// const QWidget *widget = option.widget; QStyle *style = widget ? widget->style() : QApplication::style(); style->drawControl(QStyle::CE_ItemViewItem, &opt, painter, widget); }

@jpnurmi Thank's a lot! That's it :) Now everything works like a charm :) You saved my day!

I tried, but it doesn't work.

@Mark81 Even in JavaScript you have two models, you just don't typically think of it that way: model 1: the database, model 2: the results on the client side. Here, you have two models: 1 - the database, 2 - the QML side. So what you need to do is create a paginated model using LIMIT/OFFSET queries.

@Mark81 If index is 0 then don't start the animation. Well something like: property int myIndex : 0 function animate(idx) { listAnimation.running = false var pos = list.contentY; var destPos; list.positionViewAtIndex(idx, ListView.Beginning); destPos = list.contentY; listAnimation.from = pos; listAnimation.to = destPos; listAnimation.running = true; } Timer { ... onTriggered: { if(myIndex==0) list.positionViewAtIndex(myIndex,ListView.Beginning); else animate(myIndex) myIndex++ if(myIndex==list.count-1) myIndex = 0 } }

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

Thanks for your efforts. As you said it works in a project I have a second look at my code. I'm not writing a Quick-App but a QWidget-App and use the map inside a QQuickWidget. I have read about another approach to embed qml content in a QWidget-App using QQuickView inside a QObject-Container. This approach works as expected. I don't know why it doesn't work with a QQuickWidget but my problem is solved. Best Regards

I got a solution on SO: I should've used "height" instead of height inside PropertyAnimation.

@Alexander_Lanin didn't see you already found it before I submit my reply...

just for addition: see this So i ncase you draw anti-aliased, the border-offset would just be the half of the border-width.

@kylecorver Can you post the complete program? The original isn't a a valid Qml document, leading to guessing about which errors will or will not occur. The OS and Qt version used might also be relevant.

Hi, Just store the full time in your model and use a QStyledItemDelegate to change the visualization part. It should be enough to just reimplement displayText. Hope it helps