On Thursday 16 September 2010, 10:52:10 HundredsAnd100s wrote: > I'm new to both PyQt and Qt, so apologies if this is obvious. I'm trying > to track mouse events with a QGLWidget but it's not working quite like > expected. I switched to a QWidget to avoid any possible complications but > the problem remains. > > I want to recognize that one or more mouse buttons are being pressed > simultaneously. This works except for combinations of left and right > buttons. If, at any time, both those buttons end up pressed, the button I > release first won't generate a mouseRelease event. The other button will, > but Qt seems to think the one I released first is still depressed and > grabs the mouse until I press and release that button again, at which > point I get a single mouseRelease event. > > For instance: > Press left button --> mousePress: event.button()=left, event.buttons() = > left > Press right button --> mousePress: event.button()=right, event.buttons() > = left | right > Release right button --> nothing > Release left button --> mouseRelease: event.button()=left, > event.buttons()=right > ...try to click other things but the mouse is locked... > Press right button --> nothing > Release right button --> mouseRelease: event.button()=right, > event.buttons()=0 > ...Now I can use the mouse again... > > The code works for all three buttons on their own and for any combination > of left and middle or right and middle buttons. Just not left and right. > This is under Linux, for what that's worth, and I'm confident I'm not > simulating a three-button mouse. > > I suspect this has something to do with context menus but can't find > anything in QWidget that has any effect. I overrode event() and noticed > that left and middle button presses were reported as > QEvent.MouseButtonPress while right button presses were reported as > QEvent.ContextMenu, even with the widget's context menu policy set to > NoContextMenu or PreventContextMenu. > > I know I'm missing something, so if someone could point out what it is > I'd be grateful. Here's the code: > > import sys > import PyQt4.QtCore as core > import PyQt4.QtGui as gui > > class MyWidget(gui.QWidget): > def __init__(self, *args, **kwargs): > gui.QWidget.__init__(self, *args, **kwargs) > self.setAttribute(core.Qt.WA_NoMousePropagation, False) > > self.setContextMenuPolicy(core.Qt.ContextMenuPolicy(core.Qt.PreventContex >tMenu)) > > def mousePressEvent(self, event): > print "Mouse press:", event.button(), int(event.buttons()) > > def mouseReleaseEvent(self, event): > print "Mouse release:", event.button(), int(event.buttons()) > > > class MainWindow(gui.QMainWindow): > def __init__(self, parent=None): > gui.QWidget.__init__(self, parent) > self.setCentralWidget(MyWidget()) > > > app = gui.QApplication(sys.argv) > main_window = MainWindow() > main_window.show() > app.exec_()
Hmm, not here, neither with self.setContextMenuPolicy (indented on self.setAttribute level), nor without: With: Mouse press: 1 1 Mouse release: 1 0 Mouse press: 4 4 Mouse release: 4 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 4 4 Mouse press: 1 5 Mouse release: 4 1 Mouse release: 1 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 1 1 Mouse press: 2 3 Mouse release: 1 2 Mouse release: 2 0 Mouse press: 1 1 Mouse release: 1 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 1 1 Mouse press: 2 3 Mouse release: 1 2 Mouse release: 2 0 Mouse press: 4 4 Mouse release: 4 0 Mouse press: 1 1 Mouse release: 1 0 Mouse press: 1 1 Mouse press: 4 5 Mouse release: 4 1 Mouse release: 1 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 4 4 Mouse press: 2 6 Mouse release: 4 2 Mouse release: 2 0 Mouse press: 1 1 Mouse press: 2 3 Mouse release: 1 2 Mouse release: 2 0 Without: Mouse press: 2 2 Mouse release: 2 0 Mouse press: 1 1 Mouse release: 1 0 Mouse press: 4 4 Mouse release: 4 0 Mouse press: 1 1 Mouse press: 2 3 Mouse release: 2 1 Mouse release: 1 0 Mouse press: 1 1 Mouse press: 4 5 Mouse release: 4 1 Mouse release: 1 0 Mouse press: 2 2 Mouse press: 4 6 Mouse release: 4 2 Mouse release: 2 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 2 2 Mouse press: 4 6 Mouse release: 4 2 Mouse release: 2 0 Mouse press: 2 2 Mouse release: 2 0 Mouse press: 4 4 Mouse press: 2 6 Mouse release: 4 2 Mouse release: 2 0 Mouse press: 1 1 Mouse release: 1 0 Mouse press: 4 4 Mouse press: 1 5 Mouse release: 4 1 Mouse release: 1 0 Mouse press: 1 1 Mouse press: 2 3 Mouse release: 1 2 Mouse release: 2 0 Python version: 2.6 sip version: 4.10.5 Qt4 version: 4.6.3 PyQt4 version: 4.7.4 Pete _______________________________________________ PyQt mailing list PyQt@riverbankcomputing.com http://www.riverbankcomputing.com/mailman/listinfo/pyqt
