Qt connect and first connect or unicode

[Oscar Benjamin]

On 17 September 2013 05:12, Mohsen Pahlevanzadeh
<mohsen at pahlevanzadeh.org> wrote:
> Dear all,
>
> Unfortunately, i confused and need help... the following code is:
> ###################################################
> ##CheckBox:
>     QtCore.QObject.connect(self.checkBox,
> QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
> self.materialsInstance.setFilterDict("C",self,"name",self.lineEdit.text()))
>
>         QtCore.QObject.connect(self.checkBox_2,
> QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
> self.materialsInstance.setFilterDict("C",self,"bought_price",persianToInteger(unicode(self.lineEdit_2.text()))))
>
>         QtCore.QObject.connect(self.checkBox_4,
> QtCore.SIGNAL(_fromUtf8("toggled(bool)")), lambda:
> self.materialsInstance.setFilterDict("C",self,"stock",persianToInteger(unicode(self.lineEdit_3.text()))))
>
> ##LineEdit
>         QtCore.QObject.connect(self.lineEdit,
> QtCore.SIGNAL(_fromUtf8("editingFinished()")), lambda:
> self.materialsInstance.setFilterDict("L",self,"name",self.lineEdit.text()))
>
>         QtCore.QObject.connect(self.lineEdit_2,
> QtCore.SIGNAL(_fromUtf8("editingFinished()")), lambda:
> self.materialsInstance.setFilterDict("L",self,"bought_price",persianToInteger(unicode(self.lineEdit_2.text()))))

I don't really know what the problem you're having is but this code is
very difficult to read.

What's the point of the _fromUTF8 function? The strings you pass it
are all ASCII, so if you're trying to create unicode strings you could
just use the u prefix e.g. u"toggled(bool)".

Also you can avoid referring to the same deeply nested attributes by
importing them or assigning them to something first e.g.:

from QtCore import SIGNAL
from QtCore.QObject import connect  # Not sure if QObject is a module...


## Checkbox:
    setfilter = self.materialsInstance.setFilterDict

    connect(self.checkBox, SIGNAL(u"toggled(bool)"),
            lambda: setfilter("C", self, "name", self.lineEdit.text()))


Oscar