General and Desktop

@forlorn said in QSettings to save data structure: I'm aware that you can use QSettings to maintain things like the size of the GUI screen, but can I also use it to store the List data structure and the index in that list that the user left off on? yes, when you implement the stream operators for your types you want to store.

Hey Nope not yet. Will try it, just need to learn it :- )

Since I'm actually using catkin tools on-top of cmake, some of the key things were as follows: list(APPEND CMAKE_PREFIX_PATH /opt/ros/$ENV{ROS_DISTRO}) list(APPEND CMAKE_PREFIX_PATH /opt/Qt5.12.2/5.12.2/gcc_64) find_package(Qt5 REQUIRED COMPONENTS Core Widgets Scxml ) #CMAKE_AUTOMOC does not work!! qt5_wrap_cpp(SCXML_MOC include/ros_scxml_state.h include/ros_scxml.h ) target_link_libraries(${PROJECT_NAME}_SM ${catkin_LIBRARIES} Qt5::Core Qt5::Scxml Qt5::Widgets )

@Zunneh you should look into QStandardPaths to get cross platform locations to write read and store data https://doc.qt.io/qt-5/qstandardpaths.html For why windows does not allow it, security reasons I would assume. Prevents mallware from messing with with importand programs. To be honest, Windows is a good bit behind on that compared to other os, on Mac for example each program is its own seperated sandbox. Very hard to break out of that 😉

@Annabela_Cortez Hi If you do like this ( the wrong way) GraphWidget *w = new GraphWidget(this); ui->setupUi(this); Then all kinds of widgets (if any in the UI) will be put on top of your GraphWidget. MainWindow has a special center widget called centralWidget() that will/might cover your widget when the order of insertion is wrong. Even if a widget is transparent, it will/might still eat mouse events. So rule is ui->setupUi(this); always comes first.

Is it possible to use (build) QtMEL library on Android? I need to record short *.mp4 videos with some OpenCV operations and your library looks really good. Could you please provide some tips for *.pro file or other settings?

Thanks for the explanation

@vale88 Ok. So, make it solved then.

Hello, I created the button with: button = new QPushButton(table->viewport()); and I update its position on the table to be after the last row each time a new row is inserted.

@JonB ok thank you

@NotYourFan What do you use for this function? I mean: is it a scripting language? JavaScript? Some custom format? ...?

@J-Hilk I have no clue what that strange thing could be since everything seems to be ok when using QApplication::closeAllWindows(). My form class instance is created on the stack.

@J.Hilk Wow so much help ! Thank you very much, thanks to you I have exactly what I was searching for :) Thanks a lot ! I put solved on the subject !

@aha_1980 yes online installer.

@Christian-Ehrlicher OK, thanks a lot, now I feel dump, I just copy/paste a code modifying the Create function but not the Construct, with this it actually works as expected: static void *Construct(void *where, const void *t) { if (!t) return new (where) MyClass(CREATE_DEFAULT_MY_CLASS()); return new (where) MyClass(*static_cast<const MyClass*>(t)); } Thanks again

@Pada_ nope. i dont have 5.4.