Good question, I checked the API and also couldn’t find a signal that would be triggered only if value was modified by user. The workaround you proposed may be the only option, just keep in mind that you don’t have to disconnect / connect all signals, just use QObject::blockSignals method: slider->blockSignals(true); slider->setValue(x); slider->blockSignals(false); Hope that … Read more
Old question, I know. But nowadays, you can simply use CONFIG += force_debug_info to get debug symbols even in release mode. When you use QMake via the command line, I usually do this to get a release build with debug info: qmake CONFIG+=release CONFIG+=force_debug_info path/to/sources this will enable below conditions of Qt5/mkspecs/features/default_post.prf: force_debug_info|debug: CONFIG += … Read more
There’s no signal but if you want to know when your widget has lost focus, override and reimplement void QWidget::focusOutEvent(QFocusEvent* event) in your widget. It will be called whenever your widget has lost focus. To give focus to a widget, use QWidget::setFocus(Qt::FocusReason). To validate input in a QLineEdit or QComboBox you can subclass QValidator and … Read more
Like this: QString selfilter = tr(“JPEG (*.jpg *.jpeg)”); QString fileName = QFileDialog::getOpenFileName( this, title, directory, tr(“All files (*.*);;JPEG (*.jpg *.jpeg);;TIFF (*.tif)” ), &selfilter ); The docs are a bit vague about this, so I found this out via guessing.
I do it like this win32 { ## Windows common build here !contains(QMAKE_TARGET.arch, x86_64) { message(“x86 build”) ## Windows x86 (32bit) specific build here } else { message(“x86_64 build”) ## Windows x64 (64bit) specific build here } }
To understand the issue you have to understand how signals are emitted: They are simply a non-static member function call and thus require an instance to be called on (the “sender”). Typically, this instance is this (if you emit the signal from within another non-static member function of the same class), so the call syntax … Read more
It’s a good thing you’re using Python, I created a library to do just that a while ago: http://www.hardcoded.net/articles/send-files-to-trash-on-all-platforms.htm On PyPI: Send2Trash Installation Using conda: conda install Send2Trash Using pip: pip install Send2Trash Usage Delete file or folders from send2trash import send2trash send2trash(“directory”)
Use a lambda Here’s an example from the PyQt book: self.connect(button3, SIGNAL(“clicked()”), lambda who=”Three”: self.anyButton(who)) By the way, you can also use functools.partial, but I find the lambda method simpler and clearer.
You can, creating an QStringList before iteration, like this: QStringList myOptions; myOptions << “goLogin” << “goAway” << “goRegister”; /* goLogin = 0 goAway = 1 goRegister = 2 */ Then: switch(myOptions.indexOf(“goRegister”)){ case 0: // go to login… break; case 1: // go away… break; case 2: //Go to Register… break; default: … break; }
QString has two methods related to trimming whitespace: QString QString::trimmed() const Returns a string that has whitespace removed from the start and the end. QString QString::simplified() const Returns a string that has whitespace removed from the start and the end, and that has each sequence of internal whitespace replaced with a single space. If you … Read more