@Joe-von-Habsburg There are, I assume, numerous online product activation services like LicenseSpring (no affiliation or recommendation). You could roll-your-own with something like Partial Key/Serial Validation or something similar.

And no comes a reply to myself ! We figured out how to hack towards the behaviour we need. 1/ we add an ObjectiveC .mm file to the project, to call somme MacOS Cocoa's stuff 2/ At application AppB startup, from this ObjectiveC file we call [NSApp hide:nil] which "hides" the application, and reactivate our AppA. Well... This turns into some flickering of the active application (because AppA looses for a few ms activation when AppB starts ; then AppB hides itself and AppA gets the active app again), but we can live with that ! Thanks

@ricardovaras_99 said in What library should I use for animation in Qt Widgets Application?: And I want to simulate water level increasing on a tank. Do you want to animate the water level (in other words, make the level rise or fall at a specific speed in real time)? Or do you just want to display the water level? (in other words, make the picture show the latest level)? If you want the latter, have a look at the Qt Quick Coffee Machine demo: Video: https://resources.qt.io/videos/built-with-qt-qt-quick-coffee-machine-demo-qtws17 Code: https://doc.qt.io/qt-5/qtdoc-demos-coffee-example.html

@HenrikSt-0 said in Starting App from other class: GraphDataGenerator It is the class in the example - did you add it to your project?

Thanks much all of the repliers.

@JNBarchan It's great. I just use this function: QWidget::createWindowContainer. Maybe I can try to modify the code. Thank you for your reply.

Hi, Do you mean you have two different executable started ?

@Sh1gs Just as a note. There is no difference adding widgets in code or adding via Designer. The setupUI() as seen in mainwindow ctor creates the Designer widgets as code. So the only true difference is handwritten versus generated from UI file. Also adding via Designer, gives easier translations as the translate function is generated for the user.

@GTDev Thanks for the reply. I will go on with V-Play and try to implement my app with V-Play for now. But if anybody has another idea why this happens I would be grateful for cheering.

You can set the sizePolicy of each element in a layout. Typically a button has a fixed vertical size and an expanding horizontal size (dont get confused with "minimum" and "expanding" size policy). Maybe it is useful to take the Qt creator and create a simple application and play around with layouts...

I've found the problem it is a process deleted without initialized.

Hi, You have an example in CMake's documentation here

How about the Fortune example? Cheers.

@yuvaram thanks a lot :)

You can call QWidget::resize() in main.cpp to make your viewer bigger.

Hello @applefier , To fix the size of your layout you can use the setSizeConstraint ( SizeConstraint ) function and you have to put QLayout::SetFixedSize as arg of SizeConstraint Here is the doc explanation: sizeConstraint : SizeConstraint This property holds the resize mode of the layout. enum QLayout::SizeConstraint The possible values are: Constant Value Description QLayout::SetDefaultConstraint 0 The main widget's minimum size is set to minimumSize(), unless the widget already has a minimum size. QLayout::SetFixedSize 3 The main widget's size is set to sizeHint(); it cannot be resized at all. QLayout::SetMinimumSize 2 The main widget's minimum size is set to minimumSize(); it cannot be smaller. QLayout::SetMaximumSize 4 The main widget's maximum size is set to maximumSize(); it cannot be larger. QLayout::SetMinAndMaxSize 5 The main widget's minimum size is set to minimumSize() and its maximum size is set to maximumSize(). QLayout::SetNoConstraint 1 The widget is not constrained. Hope this will work, Regards !

@mcosta Thank you it all finally working fine :)