On 7/16/2012 12:28 PM, tinn...@isbd.co.uk wrote: > tinn...@isbd.co.uk wrote: >> I am trying to use the PyQt4 calendar widget to perform some different >> actions on specific dates. There are three events available:- >> >> selectionChanged() >> activated(QDate) >> clicked(QDate) >> >> On trying all these out it would appear that the event handlers get >> called as follows:- >> >> The clicked(QDate) event gets called if you click on an already >> selected date. >> >> The selectionChanged() and then the clicked(QDate) events are >> called when you click on a new date. >> >> The selectionChanged(), then the clicked(QDate) and then the >> activated(QDate) events are called if you double-click on a new date. >> >> The clicked(QDate) and then the activated(QDate) events are called >> if you double-click on an already selected date. >> >> >> How can I get a single-click on a date to get 'Action1' and double-click >> on a date to get 'Action2'? > I'm sorry, this got sent a bit before I'd completed it. The trouble > is that I want to run Action1 if I single-click on a date whether or > not it's a changed date and I want to run Action2 if I double-click on > a date whether or not it's a changed date. However I don't see how I > can do this because of the order in which the event handlers are > called. > > Is there any way to manipulate this so I can get the result I want? > At the moment the only way I can see to do it is to wait a while after > a click and then look at what actions occurred but this seems a real > bodge.
I suspect that the consensus would be "don't do that" -- having single-click and double click perform unrelated actions. But here's an implementation based on the advice at http://www.qtcentre.org/threads/7858-Double-Click-Capturing (use Ctrl-Break to break out of the event loop) import PyQt4.QtCore as C import PyQt4.QtGui as G class Button(G.QPushButton): def __init__(self, text): G.QPushButton.__init__(self, text) # flag to suppress second mouseReleaseEvent # in this double-click event sequence: # 1. mousePressEvent # 2. mouseReleaseEvent # 3. mouseDoubleClickEvent # 4. mouseReleaseEvent self.double_clicked = False def mouseReleaseEvent(self, evt): # executed for first mouseReleaseEvent if not self.double_clicked: self.first_click_timer = C.QTimer() self.first_click_timer.setSingleShot(True) # double-click must occur within 1/4 second of first-click release self.first_click_timer.setInterval(250) self.first_click_timer.timeout.connect(self.single_click_action) self.first_click_timer.start() # executed for second mouseReleaseEvent else: # reset the flag self.double_clicked = False def single_click_action(self): print "Performing single-click action" def mouseDoubleClickEvent(self, evt): # suppress the single-click action; perform double-click action instead self.first_click_timer.stop() print "Performing double-click action" # prepare for second mouseReleaseEvent self.double_clicked = True # main program app = G.QApplication([]) button = Button("Click or double-click me") button.show() app.exec_() HTH, John -- http://mail.python.org/mailman/listinfo/python-list
