Re: PyQt QCalendarWidget events question
John Posner jjpos...@optimum.net wrote: 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. They're not actually unrelated, one will edit an existing entry in a file for the given date, the other will add a new entry in the file for that date. I.e. single-click means open file at specified date, double-click means open file at specified date and insert a new entry for that date. 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_() Yes, thanks, though it is basically the bodge using timing that I was trying to avoid. It's so fundamental to most GUIs that single-click and double-click allow one to do different things with the same object I'm surprised that pyqt makes it so difficult to implement. -- Chris Green -- http://mail.python.org/mailman/listinfo/python-list
Re: PyQt QCalendarWidget events question
On Tue, Jul 17, 2012 at 7:34 PM, tinn...@isbd.co.uk wrote: It's so fundamental to most GUIs that single-click and double-click allow one to do different things with the same object Kinda yes, kinda no. Most GUIs and GUI recommendations would either enforce or strongly suggest that the double-click action incorporate the click action; for instance, click to select, double-click to open. The series of events usually goes: Mouse down Mouse up Click Mouse down Mouse up Double-click They're fired as things happen and in that order. (Some systems insert another Click just before the Double-click, but that's generally unhelpful.) Please code your application so that this isn't a problem to it, because anything else causes untold confusion to the users. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
PyQt QCalendarWidget events question
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'? -- Chris Green -- http://mail.python.org/mailman/listinfo/python-list
Re: PyQt QCalendarWidget events question
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. -- Chris Green -- http://mail.python.org/mailman/listinfo/python-list
Re: Re: PyQt QCalendarWidget events question
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
