QML and Qt Quick

Thank you for helping me understand. Have a nice day

@jsulm mouseArea is a MouseArea which covers all the screen (because I don’t want the user to need to hover over the listview to be able to zoom). The value of the mapped point is in the range of the ListView and seems to do what it is supposed to do. When hovering on the top left of the listview it’s (0|0), at the bottom right it’s the listviews width and height (middle-ish it might be around (520|400)

I got it working. There were a few things wrong with my original example, but the main problem was I needed to declare the scrollbar differently: Flickable { id: flickable Layout.fillHeight: true Layout.fillWidth: true clip: true contentHeight: equipmentGrid.height GridLayout { id: equipmentGrid ... } ScrollBar.vertical: ScrollBar { policy: ScrollBar.AsNeeded } } } Once I got the scroll bar operational, I needed to add the "clip: true" in order to prevent the flickable from scrolling up over items above the GridLayout.

@SPlatten said in C++ return to QML: Can anyone point / help me to a good example / tutorial on using QVariant to construct an object that can be returned to QML ? For your type to be accessible in QML it is either a primitive, a gadget (a.k.a. a value type) or a QObject derived class. No other options are allowed. If it's a primitive - it's directly accessible. If it's a gadget then it must qualify for a metatype and has to have the Q_GADGET macro, (usually) have it registered with qRegisterMetatype if it's a parameter for signal/slot connections, and most importantly be registered with the QML engine with QML_VALUE_TYPE. https://doc.qt.io/qt-6/qtqml-cppintegration-definetypes.html QObject derived types simply have the Q_OBJECT macro and the QML_ELEMENT annotation. Either way you should declare the available properties with Q_PROPERTY.

@JoeCFD yeah, I did read that, but I didn't understand it at first. I guess the purpose of a Flickable is more to accept user input than to control the display of its contents? As I mentioned in another thread, I'm still not able to get my Flickable's ScrollBar working, and I thought it might be related to this, but...now I guess not. Thanks...

I found the problem. It was a TextField which I forced active focus on upon completion of a object I used in that window. Removing forcing the focus fixes the problem

What do you mean by "downloading"?

Thanks for this I got it how to do it :) This is for those who came this post for similar solution: Rectangle{ color:"transparent" border.color:"#88000000" border.width: 5 x:200 y:200 width:640 height:480 radius:5 Rectangle{ x:parent.border.width width:parent.width-10 y:parent.border.width height:30 color:"#88000000" } } And it's output: [image: cd562bd9-830f-4716-8b47-9c9054ae80f0.png]

I change some data organization logic. And now I can show and update my charts. I show all channels in one chart (similar to https://forum.qt.io/topic/140468/periodically-update-data-in-qml-solved/4, but model = numberOfHub*8) After generating dates from all channel I update corresponded Hub. void HubSet::setLatestChannelData(QList<double> newLatestChannelData) { m_latestChannelData = newLatestChannelData; int j=0; QList<double> temp_8_sized; for (int i = 0; i < 8*m_hubset.count(); ++i) { temp_8_sized.append(m_latestChannelData[i]); if (((i+1) % 8)==0) { m_hubset[j]->setChannelData(temp_8_sized); j++; temp_8_sized.clear(); } } emit latestChannelDataChanged(); } ..... protected: QList<Hub *> m_hubset;

@mzimmers said in Is it possible to dynamically assign a component?: @kshegunov thanks for the suggestions. I'm curious why you think it would be better to use sourceComponent instead of source. It's much more flexible. I can define the component in the source of the user file (the QML that uses the above), or I can instantiate it from a QML file by name, or - god forbid ;) - expose it from C++ ... e.g. Component { id: someComponent ComboBox {} } MyTile { delegate: someComponent opened: true titleText: "whatever" }

Hello, as a clarification in case you have any ideas, this is what I try to achieve: https://www.youtube.com/watch?v=-OcEpGMBNzg

@JonB said in QML JS function return type &#x60;void&#x60;: @paulmasri One thing: that looks like a warning in the code editor parser. Does it cause any problem/generate an error when you run the code? Warnings are yellow, errors red in my setup. Yes it does cause build errors, not just Qt Creator syntax errors. (Good question though as sometimes qmllint is not correct in Qt Creator.)

"append" causes a redraw. There is no way to disable the redraw that I can find. The QML api for charts is kinda crappy for adding data points. Which is why I had to use "replace" in C++. I have done thousands of points this way and it doesn't cause delays in the UI interface.

You don't want to do that in QML ? That would be my advice. A Repeater with a Rectangle as delegate