General and Desktop

@viniltc You can use Qt3D (C++ or QML) for that. You can use just a standard cube (other basic shapes are supported) or you could create your own mesh / .obj - file with e.g. Blender and import it. Qt3D https://doc.qt.io/qt-5/qt3d-index.html Here are some examples https://doc.qt.io/qt-5/qt3d-examples.html. I can recommend the ShadowMap QML Example (QML) and the Basic Shape C++ Example You can set the transformation by using QQuaternion and your quaternion data directly https://doc.qt.io/qt-5/qquaternion.html

there are open source MP3 decoder libraries. google search: "mp3 decoder library sourcecode"...

I think this is now solved ... I can follow the example of "Star Delegate" almost verbatim.

@J-Hilk , @MalachiCole I haven't read through the code, and don't know what exactly it calls, but since the OP asks about "edge case" and "absolutely critical", is there any kind of indirect dynamic memory allocation going on here at all? Just that it always possible that the application runs out of memory while executing the code, a slight possibility to be aware of. No more than that.

@Pl45m4 thank you a lot!

@Ketan__Patel__0011 Subclass QLabel and override https://doc.qt.io/qt-5/qwheelevent.html

@TimothyCole In addition to what @jsulm said: All you could do is creating a custom widget (UI in Designer) and promote it or add it at runtime to your parent layout. If you only need one or two, it's not efficient, but if you need like five or more layout rows with the same content (ComboBox + StackedWidget) and you dont want to use a static number of rows, it is worth it. Edit: There is also an QUiLoader [click] to load pre-designed UI-files at runtime (then you dont need to create a custom class for your content. Just insert your rows by loading your UI file multiple times and adding the result to your parent layout)

@SGaist Snapcraft and appImage are not exactly the same thing. Anyway, if someone else is trying to "snap" a Qt app using a different version then the old ones coming with snapcraft, I created a small project where you may find an hint: https://github.com/jdelromano/snapqt5

@J-Hilk Yes row index was getting out of range, Thanks :)

@anil_arise Can you share this link again plzzzzz

@JonB @jsulm I think I know the problem. It should be receive "\n" to confirm the command!

@jsulm Thanks a bunch! Done and done! Now my only battle is scaling my line with the label. Remember, the line is cvLine and not Qline in the video. Thank you once again for your support.

@Kutyus Did you try to disable the input mask, then set the string and then enable the input mask again?

@Yue-JIN Yes, with your QToolButton subclass you have to

@mrjj @Christian-Ehrlicher Thanks for reply

@mrjj thank you for answer I'm sorry, I forgot to add lines where I apply QLinearGradient to the curve that was generated with QwtPlotCurve: QwtPlotCurve *curve = new QwtPlotCurve(); QLinearGradient linearGrad(QPointF(0, 0), QPointF(1, 0)); linearGrad.setCoordinateMode(QGradient::ObjectMode); linearGrad.setColorAt(0, Qt::yellow); linearGrad.setColorAt(0.5, Qt::red); linearGrad.setColorAt(1, Qt::cyan); QGraphicsOpacityEffect* opacity = new QGraphicsOpacityEffect; opacity->setOpacity(0); opacity->setOpacityMask(linearGrad); curve->setBrush(linearGrad); So the filled area is the area between the curve and some baseline located at y=10000 I found a way to set opacity of each color like: QColor green70 = Qt::green; green70.setAlphaF(0.7); // here we set the opacity (or more likely transparency) linearGrad.setColorAt(1, green70); That works but if I want to change the opacity I would need to change alpha of every color in loop. Actually that is not so bad but I'm trying to implement linear colorbar where colors are linearly changeable and they are set by some value (not by a name like red or green).

Looks primising, will give it a go thanks! Yeah I upgraded and then downgraded again.

@Infinity said in How to create an invalid QItemSelection: How can I create a QItemSelection which contains two invalid indexes why? A QItemSelection is basically a list of selection ranges So no, it's not possible (and not needed)

@mrjj Hi, I see. I didn't realize enum is a type. This works, can mark this thread as solved. Thanks a lot