qt4

问题 Suppose I have a focused QPushButton : my_button = new QPushButton("Press me!", this); my_button->setFocus(); When this button is displayed, pressing Space will trigger (i.e. click) the button. I don't want this behavior. Instead, I would like Ctrl + Enter to trigger the button. How can I achieve this in Qt? (Working examples would really help as this is part of my first Qt app) 回答1: I think the best way is to do as @thuga said. The idea is to subclass the QPushButton and reimplement

问题 Suppose I have a focused QPushButton : my_button = new QPushButton("Press me!", this); my_button->setFocus(); When this button is displayed, pressing Space will trigger (i.e. click) the button. I don't want this behavior. Instead, I would like Ctrl + Enter to trigger the button. How can I achieve this in Qt? (Working examples would really help as this is part of my first Qt app) 回答1: I think the best way is to do as @thuga said. The idea is to subclass the QPushButton and reimplement

问题 im having trouble importing this. i am a newbie so please use layman words i can follow:p. riverbank said i need sip. but there is a sip folder in the pyqt download i installed, so do i have it already? there are some related questions on this site, which lead me to try these method:.. my pyqt folder is PyQt-win-gpl-4.9.4. so i typed: sys.path.append('C:\Program Files\PyQt-win-gpl-4.9.4\sip') this adds it fine, inside the 'sip' folder, it has a bunch of folders like QtCore etc.. and ive tried

问题 im having trouble importing this. i am a newbie so please use layman words i can follow:p. riverbank said i need sip. but there is a sip folder in the pyqt download i installed, so do i have it already? there are some related questions on this site, which lead me to try these method:.. my pyqt folder is PyQt-win-gpl-4.9.4. so i typed: sys.path.append('C:\Program Files\PyQt-win-gpl-4.9.4\sip') this adds it fine, inside the 'sip' folder, it has a bunch of folders like QtCore etc.. and ive tried

问题 I can't get it why the ff code returns 12.62 instead of 12.63 QDebug << QString::number(12.625, 'f', 2); and also what will be the solution for this? Currently my solution is this QDebug << QString::number(12.625 + 0.0001, 'f', 2); and it will return 12.63 . btw my OS is ubuntu 11.04 回答1: GCC uses "Round to Even" or "Banker's Rounding" as it's default mode while Visual Studio uses "Round away from Zero" From the GCC docs: Rounding This is the default mode. It should be used unless there is a

问题 I know that with grabKeyboard() my widget is able to grab every keyboard event also if it's not focused, but what if I wanted to capture just three or four keys? I tried with an event filter http://doc.trolltech.com/3.3/qobject.html#installEventFilter but that didn't work (perhaps because I installed it like this?) class MyWidget: public QGLWidget { ... protected: bool eventFilter( QObject *o, QEvent *e ); }; bool MyWidget::eventFilter( QObject *o, QEvent *e ) { if ( e->type() == QEvent:

问题 I'm trying to simply save a file. However, I need a filename entered without a suffix to automatically get a default suffix (which setDefaultSuffix() does). I'd rather not completely lose the native save dialog just for this. exec() is not overloaded from QDialog, so it totally bypasses the native hook (ignoring the DontUseNativeDialog option even if it's false). If I disable the file overwrite warning and append the default suffix myself after the function returns, then I'd be re-opening the

问题 I'm trying to simply save a file. However, I need a filename entered without a suffix to automatically get a default suffix (which setDefaultSuffix() does). I'd rather not completely lose the native save dialog just for this. exec() is not overloaded from QDialog, so it totally bypasses the native hook (ignoring the DontUseNativeDialog option even if it's false). If I disable the file overwrite warning and append the default suffix myself after the function returns, then I'd be re-opening the

问题 Does anyone know if it is possible to use drag and drop with a tray icon using Qt? 回答1: I've been doing some research and here is what I have come up with: A QSystemTrayIcon cannot explicitly handle a drag/drop event. However there is a workaround based on the Spifftastic tray icon location method. You create a uniquely colored icon and place it as the icon for a brief moment and take a screenshot of it. Given that you know the color sequence for the icon, you can search through the

问题 Does anyone know if it is possible to use drag and drop with a tray icon using Qt? 回答1: I've been doing some research and here is what I have come up with: A QSystemTrayIcon cannot explicitly handle a drag/drop event. However there is a workaround based on the Spifftastic tray icon location method. You create a uniquely colored icon and place it as the icon for a brief moment and take a screenshot of it. Given that you know the color sequence for the icon, you can search through the