Question

I’m writing a database browser application with PyQt4 and because I’m new to Qt, I have some problems. I have most functionalities already written in python but know I’m trying to implement them with PyQt4 GUI.

First of all my application now looks like this:
Browser
In these catalogues I have xml files which I would like to parse.
I’ve written something like this:


QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("paste()"))

and it works. But when I’m trying to do something like this:

QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.plainTextEdit, QtCore.SLOT("insertPlainText('test')"))

it fails. After reading the manual I know that SIGNAL and SLOT must take the same arguments. So I should write some signal which executes a SLOT which is a function with QModelIndex argument which finds clicked file, creates the xmldocument object and then prints out it’s dictionaries.
My questions are:

How can I create such function which is callable as SLOT?

Because inside ui file I created a function:


def test(self):
print "Debug"

And when I’m trying to call it out

QtCore.QObject.connect(self.ui.treeView, QtCore.SIGNAL("clicked(QModelIndex)"), self.ui.test())


I’m getting this error:

TypeError: arguments did not match any overloaded call:
QObject.connect(QObject, SIGNAL(), QObject, SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
QObject.connect(QObject, SIGNAL(), callable, Qt.ConnectionType=Qt.AutoConnection): argument 3 has unexpected type 'NoneType'
QObject.connect(QObject, SIGNAL(), SLOT(), Qt.ConnectionType=Qt.AutoConnection): argument 2 has unexpected type 'str'

And another question:

How should I get path to clicked file from QModelIndex?

Answer 1

Consider using the new-style connection mechanism provided by PyQt:

self.ui.treeView.clicked.connect(self.ui.plainTextEdit.paste)

Now, paste is a method accepting a single argument, and this argument is of the type the clicked signal of self.ui.treeView sends. Dissect if from there, as you wish.

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How can I create such function which is callable as SLOT?

It’s a different error. You connect to self.ui.test(), but this is a function call, not a function. Remove the () after test. But better yet, use the new-style connection mechanism as described above.

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How should I get path to clicked file from QModelIndex?

Probably by calling its data method. Read the doc for QModelIndex