General and Desktop

It turns out the solution to this is simple, though I had to read a whole bunch of confusing descriptions of scalability. It really should be easier to find. And the Qt support pages on the topic could be less confusing. https://stackoverflow.com/questions/41331201/pyqt-5-and-4k-screen Put this in your setup code before creating the QGuiApplication, to support High DPI scaling on Windows: os.environ["QT_AUTO_SCREEN_SCALE_FACTOR"] = "1" sys.argv += ['--style', 'fusion'] app = QGuiApplication(sys.argv) The font scaling ends up a little bit different, but that is acceptable for my use case. For C++ users, look here: https://doc.qt.io/qt-5/qtquickcontrols2-highdpi.html Whew! I was getting nervous about my decision to create this cross platform UI.

@taedooly said in How can I access json data at c++ code in qml?: does QJsonObject type support direct access in qml? QML converts the QVariantMap type to a JSON object. So simply call QJsonObject::toVariantMap() and pass it to on

I guess so, thank you for your replies.

@Perdrix said in Constructing a std::filesystem::path from a QString: it's just that I've been bitten before by stuff that felt like it ought to work but didn't! Still no clear answer :) When the path is properly constructed I don't see what should go wrong here.

Ownership and qobject parent / child relationship are two similar but different things. Just because an object takes ownership of another object there is not need that one is the parent of the other.

'widget' is a really bad name when you want to use findChild. Also why do you search for a QObject when you case it to a OSGWidget later on? Why not directly searching for a OSGWidget?

Use the Qt online installer to use the official binaries instead some third party stuff

@devillIsHeree Did you try any Googling for, say: Qt vlc-qt thumbnail ? E.g. Start from the comments to https://stackoverflow.com/questions/31448313/video-preview-image-using-vlc-qt-or-libvlc-directly, https://forum.videolan.org/viewtopic.php?t=148937, and several others.

just detected that myself, thanks!

@SGaist , @Helg1980 Sorry, you can see from what I wrote I just missed the this parameter. My bad.

AFAIK, you can reuse the same concepts that are used for C++ with some language adaptation.

@Nocturnal said in How to use signal from QPushButton to Main.cpp: static variables What do you mean with this? Signal/slots need objects. See the documentation.

@Cocojambo said in How to make QList const from outside: Can I prohibit copying reference and cloning the source array as result in any way from my class? No - it's a copy so the 'user' can do what he wants.

Hi again, I could finally make it! I created a new action and I have connected it with the "toggleViewAction" from the DockWidget: triggerAction = new QAction(this); connect(triggerAction, &QAction::triggered, DockWidget->toggleViewAction(), &QAction::triggered); ... Then later I can trigger the new action: triggerAction->trigger(); Thanks anyway!

My pro file QT += core gui multimedia multimediawidgets xml network greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += c++11 # The following define makes your compiler emit warnings if you use # any Qt feature that has been marked deprecated (the exact warnings # depend on your compiler). Please consult the documentation of the # deprecated API in order to know how to port your code away from it. DEFINES += QT_DEPRECATED_WARNINGS # You can also make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. # You can also select to disable deprecated APIs only up to a certain version of Qt. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 CONFIG += vlc vlc { LIBS += -lVLCQtCore -lVLCQtWidgets LIBS += -lvlc } SOURCES += \ main.cpp \ expplayer.cpp \ videowidget.cpp HEADERS += \ expplayer.h \ videowidget.h FORMS += \ expplayer.ui # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target RESOURCES += \ icon.qrc

@jerin-johnson This property's default is true for buttons that have a QDialog parent; otherwise it defaults to false. https://doc.qt.io/qt-5/qpushbutton.html#autoDefault-prop Your buttonBox is a child of your QDialog, so it must be true. You can disable it manually, but then you can't accept your dialog by pressing enter anymore. But it seems that you don't need this anyway.