A nested event loop costs you 1-2kb of stack. It takes up 5% of the L1 data cache on typical 32kb L1 cache CPUs, give-or-take. It has the capacity to reenter any code already on the call stack. There are no guarantees that any of that code was designed to be reentrant. I’m talking about … Read more
In Qt Quick Controls 2, there is no such property as TextField::style. In general, there is no way to use the style objects from Qt Quick Controls 1 with Qt Quick Controls 2. The APIs between the two major versions of Qt Quick Controls are not compatible. See the following documentation pages for more details: … Read more
Qt checks a normalized signature, meaning Normalization reduces whitespace to a minimum, moves ‘const’ to the front where appropriate, removes ‘const’ from value types and replaces const references with values.
Option 1: Promoted I suppose you mean inserting a QChartView, because QChartView inherits from QGraphicsView, this would be a good option, for this we do the following: first add QT += charts in the .pro place the QGraphicsView to the design. Right click on the QGraphicsView and select Promote to… When doing the above, a … Read more
Before starting your process call: process.setProcessChannelMode(QProcess::MergedChannels); It will cause printing everything (even STDERR output) to STDOUT output.
If you’re coming here from Google and not having luck with the accepted answer, that’s because you’re missing the other secret invocation: QScrollArea::setWidget. You must create and explicitly identify a single widget which is to be scrolled. It’s not enough to just add the item as a child! Adding multiple items directly to the ScrollArea … Read more
This problem was solved in Qt 5.2. The cute solution is: QSizePolicy sp_retain = widget->sizePolicy(); sp_retain.setRetainSizeWhenHidden(true); widget->setSizePolicy(sp_retain); http://doc.qt.io/qt-5/qsizepolicy.html#setRetainSizeWhenHidden
Usually the enclosing widget encapsulates the widgets inside it and provides a higher-level interface. E.g., if W3 contains several widgets that need to be enabled/disabled depending on some state, W3 would manage that state, provide API for it and enable/disable widgets accordingly. So usually there is no need to go directly from W1 to W3. … Read more
it took me some time until i found out what is needed. (Ubuntu) we start with the docker run command docker run -ti –rm myContainer sh -c “echo run something” ALSA: we need /dev/snd and some hardware access as it looks like. when we put this together we have docker run -ti –rm \ -v … Read more
See QtCreator Quick Tour. Qt Creator creates the following files and directories: QtCreator.db QtCreator.ini qtversion.xml toolChains.xml qtcreator qtc-debugging-helper qtc-qmldump The location depends on the platform. On Linux and other Unix platforms, the files are located in ~/.config/QtProject and ~/.local/share/data/QtProject/qtcreator. On Mac OS, the files are located in ~/.config/QtProject and ~/Library/Application Support/QtProject/Qt Creator. On Windows in … Read more