@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

@Mephi Hmm, sorry for that. I wasn't aware of it as i have never used it before. So digging in it seems that the attached properties of DelegateModel doesn't seem to work if the delegate is in separate file. Could be a bug I suppose. You can try reporting it here.

@p3c0 This sounds like a very easy solution, I'll try it out. Thank you.

@betty_crokker

Why isn't there a TableViewHeaderDelegate widget that I can "inherit" and just modify the font? Or is there, and I just don't know where to look?

There is no such way to do so. No such functionality provided yet.

Is there an example somewhere showing how to get the UI for sorting to work?

You can use the method described here. Basically it is a QML wrapper around QSortFilterProxyModel and works with ListModel.

I know that the question is old, but I have found it by Google search and think it needs some attention, as accepted answer seems to be wrong.
@p3c0's soultion does not work for me. I get a feeling that this is a bad practice. For me model contains 17 items, but by accessing contentItem.children I can access first 16 items (on indexes 0, and 2-16). On index 1 there is something I do not know what it is, but it is not an item of my GridView.

What worked for me was:

for(var child in listview.count) { listview.currentIndex = child console.log(listview.currentItem.width) }

I think that this is much better (and safer) solution.

@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!

Have the same need.
Had to create my own ComboBox in QML

Hi @patrikd,
You can keep a boolean property which will be updated as required. Use this as a condition for the model.

property bool updateNeeded: false ... ListView { model: updateNeeded ? myModel : null }

When the property updateNeeded is updated to true the binding will reevaluate and items should be populated.

@Quteroid Thanks, i really bealive i will learn more about javascript

I did figure it out in the end, mostly. The QT documentation is a good reference guide but as something to learn from, it's a bit rough. :(

@Erakis

But what If I add a new children dynamically to the Listview, (without using the model) it will no...

You have to add item to the model so that it reflects in ListView not directly.

I think the best way for me will be to loop through the children and get the data associated to this Delegate. But how to get the data associated to this Delegates ?

To get the data always use the model instead of delegate. In the first question in your first post you asked for delegate so I told the way to iterate over the delegate. To get the data its good to use model.

Hi and welcome to devnet,

Since you are painting things yourself, you would also need to handle the mouse interaction yourself. Painting a QCheckBox is not the same has having an actual checkbox widget.

@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 !