I'm not aware of another way to connect the old style besides the auto
connect by name feature.
The new style involves you defining a real python object as a signal
attribute on the class.
On Mar 3, 2013 11:21 PM, "Panupat Chongstitwattana" <[email protected]>
wrote:
> Thanks again for the link Justin :)
>
> I have another question. Say I emit my own signal
> SIGNAL("panupat(blah)", blah)
>
> Is there a way to connect it using the new style?
> ui.myWidget.panupat.connect..... always give me error that panupat doesn't
> exist
>
> but I can use the old style to connect it
> ui.connect(myWidget, SIGNAL("panupat(blah)"), someMethod)
>
> I think I read somewhere about an "accept signal" method, is that what I
> need to do?
>
>
>
> On Sun, Mar 3, 2013 at 5:02 PM, Justin Israel <[email protected]>wrote:
>
>> currentIndexChanged() signal can do either an int index, or a string. But
>> because it is a signal, you can't really be sure where the underlying C++
>> code is emitting. It could be from multiple methods. Normally what you look
>> for in the documentation is for it to say a method is virtual and should be
>> reimplemented in subclasses for xyz custom functionality.
>>
>> In this current example, one way to approach a solution would be to just
>> connect the currentIndexChanged() signal to a private method on your
>> subclass, and emit some other signal.
>>
>> And if you are interested in knowing the underlying code of Qt widgets,
>> you can look at the C++ source code (since as you have discovered, the
>> PyQt4 modules are compiled objects):
>>
>> http://qt.gitorious.org/qt/qt/blobs/6248dff2c7f3288d675de639abfbbc6c1d618006/src/gui/widgets/qcombobox.cpp
>>
>>
>>
>>
>> On Mar 3, 2013, at 10:49 PM, Panupat Chongstitwattana wrote:
>>
>> For example, QComboBox currentIndexChanged signal give me an index. If I
>> want the signals to give additional values (maybe some string), which
>> method am I looking for?
>>
>>
>>
>> On Sun, Mar 3, 2013 at 4:33 PM, Justin Israel <[email protected]>wrote:
>>
>>> It just means c++ knows about it as a real slot.
>>>
>>> What do you mean by finding a list of methods exactly? All methods are
>>> documented in the api docs. Can you give an example of what you want to do?
>>> On Mar 3, 2013 9:53 PM, "Panupat Chongstitwattana" <[email protected]>
>>> wrote:
>>>
>>>> Thanks for the link Justin.
>>>>
>>>> I don't quite understand what C++ signature does but I'll leave it at
>>>> that :D
>>>>
>>>> That page does bring up another topic I've always wonder about. It
>>>> shows sample of sub classing QComboBox and over ride signal emitters in the
>>>> handle_int and handle_string method. How can I find out more about methods
>>>> available in each widget so I can over ride it in my own class? The code
>>>> included with PyQt installation seems to be in binary.
>>>>
>>>>
>>>>
>>>> On Sun, Mar 3, 2013 at 3:24 PM, Justin Israel
>>>> <[email protected]>wrote:
>>>>
>>>>> Pyqt4 let's you use any python callable as a slot. The decorator
>>>>> actually defines a c++ signature for it as a registered slot
>>>>>
>>>>>
>>>>> http://pythonxy.googlecode.com/hg-history/4ef4255f59b092a123a5788c821434d9fe94aee9/src/python/PyQt4/PLATLIB/PyQt4/doc/html/new_style_signals_slots.html#the-pyqtslot-decorator
>>>>>
>>>>> " Although PyQt allows any Python callable to be used as a slot when
>>>>> connecting signals, it is sometimes necessary to explicitly mark a Python
>>>>> method as being a Qt slot and to provide a C++ signature for it."
>>>>> ...
>>>>> " Connecting a signal to a decorated Python method also has the
>>>>> advantage of reducing the amount of memory used and is slightly faster."
>>>>> On Mar 3, 2013 9:06 PM, "Panupat Chongstitwattana" <
>>>>> [email protected]> wrote:
>>>>>
>>>>>> Hi.
>>>>>>
>>>>>> I'm experimenting with some code and I'm curious what the
>>>>>> @QtCore.pyqtSlot() decoration does?
>>>>>> I saw it from some other codes, but even without it, testdef() still
>>>>>> returns the widget's name correctly.
>>>>>>
>>>>>>
>>>>>> from PyQt4 import QtGui, QtCore
>>>>>>
>>>>>> class cb(QtGui.QComboBox):
>>>>>>
>>>>>> def __init__(self):
>>>>>> super(cb, self).__init__()
>>>>>> self.setObjectName("test name")
>>>>>> self.currentIndexChanged.connect(self.testdef)
>>>>>> for i in range(5):
>>>>>> self.addItem(str(i))
>>>>>>
>>>>>> @QtCore.pyqtSlot()
>>>>>>
>>>>>> def testdef(obj):
>>>>>> print str(obj.sender().objectName())
>>>>>>
>>>>>>
>>>>>>
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>>>>>>
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