On Mon, 08 Mar 2010 17:29:48 -0500, Mark Visser <ma...@lumierevfx.com>
wrote:
> Is there some reason new-style connection from any signal to
> QSignalMapper.map do not appear to work?
>
> Using old-style self.connect works, i.e.:
> |
> #self.connect(self.b1, SIGNAL("clicked()"),
> # self.mapper, SLOT("map()"))
> #self.connect(self.b2, SIGNAL("clicked()"),
> # self.mapper, SLOT("map()"))
> |
> But using new-style self.<signal>.connect does not:
>
> ||| self.b1.clicked.connect(self.mapper.map)
> self.b2.clicked.connect(self.mapper.map)
> |
> Here's a complete example:|
> =========================================
> from PyQt4.QtCore import *
> from PyQt4.QtGui import *
>
> app = QApplication([])
>
> class Test(QWidget):
> def __init__(self, parent=None):
> super(Test, self).__init__(parent)
> layout = QVBoxLayout()
>
> self.b1 = QPushButton("B1")
> self.b2 = QPushButton("B2")
>
> layout.addWidget(self.b1)
> layout.addWidget(self.b2)
>
> self.setLayout(layout)
>
> self.mapper = QSignalMapper(self)
>
> self.mapper.setMapping(self.b1, "B1")
> self.mapper.setMapping(self.b2, "B2")
>
> self.b1.clicked.connect(self.mapper.map)
> self.b2.clicked.connect(self.mapper.map)
>
> #self.connect(self.b1, SIGNAL("clicked()"),
> # self.mapper, SLOT("map()"))
> #self.connect(self.b2, SIGNAL("clicked()"),
> # self.mapper, SLOT("map()"))
>
> self.mapper.mapped[QString].connect(self.sayIt)
>
> @pyqtSlot(QString)
> def sayIt(self, name):
> print name
>
>
> t = Test()
>
> t.show()
>
> app.exec_()
> ||=========================================|
It's actually a problem with QSignalMapper.map() being called from a proxy
rather than new-style connections.
The workaround is to explicitly specify a signal that is compatible with
map()...
self.b1.clicked[()].connect(self.mapper.map)
Tonight's PyQt snapshot will be smarter about finding a usable Qt slot
before deciding that it needs to use a proxy so that the workaround won't
be necessary.
Thanks,
Phil
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