[newbie] Python and Qt4 Designer

J

Jean Dubois

I'm trying to combine python-code made with QT4 designer with plain
python statements like
file = open("test","w")
Can anyone tell me what I have to add to the following code just to
open a file when clicking on the load-button and closing it by
clicking on the save button.

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created: Wed Jul 11 17:21:35 2012
# by: PyQt4 UI code generator 4.8.3
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s

class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(400, 300)
self.widget = QtGui.QWidget(Form)
self.widget.setGeometry(QtCore.QRect(10, 20, 146, 25))
self.widget.setObjectName(_fromUtf8("widget"))
self.horizontalLayout = QtGui.QHBoxLayout(self.widget)
self.horizontalLayout.setMargin(0)

self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
self.pushButton_2 = QtGui.QPushButton(self.widget)
self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
self.horizontalLayout.addWidget(self.pushButton_2)
self.pushButton = QtGui.QPushButton(self.widget)
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.horizontalLayout.addWidget(self.pushButton)

self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)

def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form",
"Form", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton_2.setText(QtGui.QApplication.translate("Form",
"Save file", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton.setText(QtGui.QApplication.translate("Form",
"Load file", None, QtGui.QApplication.UnicodeUTF8))


if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())


thanks in advance
jean
 
V

Vincent Vande Vyvre

I'm trying to combine python-code made with QT4 designer with plain
python statements like
file = open("test","w")
Can anyone tell me what I have to add to the following code just to
open a file when clicking on the load-button and closing it by
clicking on the save button.

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'test.ui'
#
# Created: Wed Jul 11 17:21:35 2012
# by: PyQt4 UI code generator 4.8.3
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
_fromUtf8 = lambda s: s

class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName(_fromUtf8("Form"))
Form.resize(400, 300)
self.widget = QtGui.QWidget(Form)
self.widget.setGeometry(QtCore.QRect(10, 20, 146, 25))
self.widget.setObjectName(_fromUtf8("widget"))
self.horizontalLayout = QtGui.QHBoxLayout(self.widget)
self.horizontalLayout.setMargin(0)

self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
self.pushButton_2 = QtGui.QPushButton(self.widget)
self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
self.horizontalLayout.addWidget(self.pushButton_2)
self.pushButton = QtGui.QPushButton(self.widget)
self.pushButton.setObjectName(_fromUtf8("pushButton"))
self.horizontalLayout.addWidget(self.pushButton)

self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)

def retranslateUi(self, Form):
Form.setWindowTitle(QtGui.QApplication.translate("Form",
"Form", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton_2.setText(QtGui.QApplication.translate("Form",
"Save file", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton.setText(QtGui.QApplication.translate("Form",
"Load file", None, QtGui.QApplication.UnicodeUTF8))


if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Form = QtGui.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())


thanks in advance
jean
Click to expand...
Connect the signal clicked of your's buttons to your's functions.

self.pushButton.clicked.connect(self.my_func)

Here's all the truth:

http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/new_style_signals_slots.html
 
V

Vincent Vande Vyvre

thanks for the reference, could you just supply a small example for
the code above to get me started?

thanks in advance
jean
Click to expand...
Just add the connection at the end of the Ui_Form class and, of course,
your function.

You can find numbers of examples in your PyQt4 install folder.
On my machine is located at /usr/share/doc/python-qt4-doc/examples

And, for more inspiration, have a look at this site:
http://diotavelli.net/PyQtWiki/
 
J

Jean Dubois

Op vrijdag 13 juli 2012 03:52:51 UTC+2 schreef Vincent Vande Vyvre het volgende:
On 12/07/12 08:42, Jean Dubois wrote:
> On 12 jul, 02:59, Vincent Vande Vyvre <[email protected]>
> wrote:
>> On 11/07/12 17:37, Jean Dubois wrote:
>>
>>
>>
>>
>>
>>
>>
>>> I'm trying to combine python-code made with QT4 designer with plain
>>> python statements like
>>> file = open("test","w")
>>> Can anyone tell me what I have to add to the following code just to
>>> open a file when clicking on the load-button and closing it by
>>> clicking on the save button.
>>> #!/usr/bin/env python
>>> # -*- coding: utf-8 -*-
>>> # Form implementation generated from reading ui file 'test.ui'
>>> #
>>> # Created: Wed Jul 11 17:21:35 2012
>>> # by: PyQt4 UI code generator 4.8.3
>>> #
>>> # WARNING! All changes made in this file will be lost!
>>> from PyQt4 import QtCore, QtGui
>>> try:
>>> _fromUtf8 = QtCore.QString.fromUtf8
>>> except AttributeError:
>>> _fromUtf8 = lambda s: s
>>> class Ui_Form(object):
>>> def setupUi(self, Form):
>>> Form.setObjectName(_fromUtf8("Form"))
>>> Form.resize(400, 300)
>>> self.widget = QtGui.QWidget(Form)
>>> self.widget.setGeometry(QtCore.QRect(10, 20, 146, 25))
>>> self.widget.setObjectName(_fromUtf8("widget"))
>>> self.horizontalLayout = QtGui.QHBoxLayout(self.widget)
>>> self.horizontalLayout.setMargin(0)
>>> self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
>>> self.pushButton_2 = QtGui.QPushButton(self.widget)
>>> self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
>>> self.horizontalLayout.addWidget(self.pushButton_2)
>>> self.pushButton = QtGui.QPushButton(self.widget)
>>> self.pushButton.setObjectName(_fromUtf8("pushButton"))
>>> self.horizontalLayout.addWidget(self.pushButton)
>>> self.retranslateUi(Form)
>>> QtCore.QMetaObject.connectSlotsByName(Form)
>>> def retranslateUi(self, Form):
>>> Form.setWindowTitle(QtGui.QApplication.translate("Form",
>>> "Form", None, QtGui.QApplication.UnicodeUTF8))
>>> self.pushButton_2.setText(QtGui.QApplication.translate("Form",
>>> "Save file", None, QtGui.QApplication.UnicodeUTF8))
>>> self.pushButton.setText(QtGui.QApplication.translate("Form",
>>> "Load file", None, QtGui.QApplication.UnicodeUTF8))
>>> if __name__ == "__main__":
>>> import sys
>>> app = QtGui.QApplication(sys.argv)
>>> Form = QtGui.QWidget()
>>> ui = Ui_Form()
>>> ui.setupUi(Form)
>>> Form.show()
>>> sys.exit(app.exec_())
>>> thanks in advance
>>> jean
>> Connect the signal clicked of your's buttons to your's functions.
>>
>> self.pushButton.clicked.connect(self.my_func)
>>
>> Here's all the truth:
>>
>> http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/new_style_...
>>
>> --
>> Vincent V.V.
>> Oqapy <https://launchpad.net/oqapy> . Qarte+7
>> <https://launchpad.net/qarte+7> . PaQager <https://launchpad.net/paqager>
> thanks for the reference, could you just supply a small example for
> the code above to get me started?
>
> thanks in advance
> jean
Just add the connection at the end of the Ui_Form class and, of course,
your function.

You can find numbers of examples in your PyQt4 install folder.
On my machine is located at /usr/share/doc/python-qt4-doc/examples

And, for more inspiration, have a look at this site:
http://diotavelli.net/PyQtWiki/
Click to expand...

Thanks for the extra docu references

regards,

jean
 
J

Jean Dubois

Op vrijdag 13 juli 2012 03:52:51 UTC+2 schreef Vincent Vande Vyvre het volgende:
On 12/07/12 08:42, Jean Dubois wrote:
> On 12 jul, 02:59, Vincent Vande Vyvre <[email protected]>
> wrote:
>> On 11/07/12 17:37, Jean Dubois wrote:
>>
>>
>>
>>
>>
>>
>>
>>> I'm trying to combine python-code made with QT4 designer with plain
>>> python statements like
>>> file = open("test","w")
>>> Can anyone tell me what I have to add to the following code just to
>>> open a file when clicking on the load-button and closing it by
>>> clicking on the save button.
>>> #!/usr/bin/env python
>>> # -*- coding: utf-8 -*-
>>> # Form implementation generated from reading ui file 'test.ui'
>>> #
>>> # Created: Wed Jul 11 17:21:35 2012
>>> # by: PyQt4 UI code generator 4.8.3
>>> #
>>> # WARNING! All changes made in this file will be lost!
>>> from PyQt4 import QtCore, QtGui
>>> try:
>>> _fromUtf8 = QtCore.QString.fromUtf8
>>> except AttributeError:
>>> _fromUtf8 = lambda s: s
>>> class Ui_Form(object):
>>> def setupUi(self, Form):
>>> Form.setObjectName(_fromUtf8("Form"))
>>> Form.resize(400, 300)
>>> self.widget = QtGui.QWidget(Form)
>>> self.widget.setGeometry(QtCore.QRect(10, 20, 146, 25))
>>> self.widget.setObjectName(_fromUtf8("widget"))
>>> self.horizontalLayout = QtGui.QHBoxLayout(self.widget)
>>> self.horizontalLayout.setMargin(0)
>>> self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
>>> self.pushButton_2 = QtGui.QPushButton(self.widget)
>>> self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
>>> self.horizontalLayout.addWidget(self.pushButton_2)
>>> self.pushButton = QtGui.QPushButton(self.widget)
>>> self.pushButton.setObjectName(_fromUtf8("pushButton"))
>>> self.horizontalLayout.addWidget(self.pushButton)
>>> self.retranslateUi(Form)
>>> QtCore.QMetaObject.connectSlotsByName(Form)
>>> def retranslateUi(self, Form):
>>> Form.setWindowTitle(QtGui.QApplication.translate("Form",
>>> "Form", None, QtGui.QApplication.UnicodeUTF8))
>>> self.pushButton_2.setText(QtGui.QApplication.translate("Form",
>>> "Save file", None, QtGui.QApplication.UnicodeUTF8))
>>> self.pushButton.setText(QtGui.QApplication.translate("Form",
>>> "Load file", None, QtGui.QApplication.UnicodeUTF8))
>>> if __name__ == "__main__":
>>> import sys
>>> app = QtGui.QApplication(sys.argv)
>>> Form = QtGui.QWidget()
>>> ui = Ui_Form()
>>> ui.setupUi(Form)
>>> Form.show()
>>> sys.exit(app.exec_())
>>> thanks in advance
>>> jean
>> Connect the signal clicked of your's buttons to your's functions.
>>
>> self.pushButton.clicked.connect(self.my_func)
>>
>> Here's all the truth:
>>
>> http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/new_style_...
>>
>> --
>> Vincent V.V.
>> Oqapy <https://launchpad.net/oqapy> . Qarte+7
>> <https://launchpad.net/qarte+7> . PaQager <https://launchpad.net/paqager>
> thanks for the reference, could you just supply a small example for
> the code above to get me started?
>
> thanks in advance
> jean
Just add the connection at the end of the Ui_Form class and, of course,
your function.

You can find numbers of examples in your PyQt4 install folder.
On my machine is located at /usr/share/doc/python-qt4-doc/examples

And, for more inspiration, have a look at this site:
http://diotavelli.net/PyQtWiki/
Click to expand...

Thanks for the extra docu references

regards,

jean
 
M

Michael Torrie

Thanks for the extra docu references
Click to expand...

In this day and age, I think compiling ui files to code is probably on
the way out. Instead you should consider using the ui files directly in
your code. This has the advantage of letting you change the gui
somewhat without having to recompile all the time.

Here is are some links that gives one way of loading and parsing the ui
file directly:

http://www.riverbankcomputing.com/pipermail/pyqt/2007-April/015902.html
http://bitesofcode.blogspot.ca/2011/10/comparison-of-loading-techniques.html
 
R

rusi

In this day and age, I think compiling ui files to code is probably on
the way out.  Instead you should consider using the ui files directly in
your code.  This has the advantage of letting you change the gui
somewhat without having to recompile all the time.

Here is are some links that gives one way of loading and parsing the ui
file directly:

http://www.riverbankcomputing.com/p...pot.ca/2011/10/comparison-of-loading-techniqu...
Click to expand...

I looked at the second link and find code like this:

app = None
if ( not app ):
app = QtGui.QApplication([])

Maybe I'm dense but whats that if doing there?

Frankly I seem to be a bit jinxed with gui stuff. A few days ago
someone was singing the praises of some new themed tk stuff. I could
not get the first two lines -- the imports -- to work and then gave up
 
M

Michael Torrie

I looked at the second link and find code like this:

app = None if ( not app ): app = QtGui.QApplication([])

Maybe I'm dense but whats that if doing there?

Frankly I seem to be a bit jinxed with gui stuff. A few days ago
someone was singing the praises of some new themed tk stuff. I could
not get the first two lines -- the imports -- to work and then gave
up
Click to expand...

Since you haven't had any experience with gui development then probably
loading ui files isn't the right place to start. First principles
(creating gui widgets from scratch) would be it.

In any case, the line in question is quite simple. It creates a
QApplication object, which is basically the engine that drives all Qt
applications. Once you call .run() on it, it takes over and handles all
the mouse events and such for you. In fact you do not have any control
over the program's execution from this point on, other than to define
event call-back methods or functions that are called by the widgets when
things happen, like mouse clicks.

All gui toolkits operate this way. You set up the widgets, then you run
the main engine or main event loop and control never returns to your
main program until something triggers the end (like closing a window or
the quit menu item is pressed).

Probably a complete working example is what you need to see, that is
documented. I primarily work with Gtk, but I'll whip up a Qt one
tomorrow if I can.
 
V

Vincent Vande Vyvre

I looked at the second link and find code like this:

app = None if ( not app ): app = QtGui.QApplication([])

Maybe I'm dense but whats that if doing there?

Frankly I seem to be a bit jinxed with gui stuff. A few days ago
someone was singing the praises of some new themed tk stuff. I could
not get the first two lines -- the imports -- to work and then gave
up
Click to expand...
Since you haven't had any experience with gui development then probably
loading ui files isn't the right place to start. First principles
(creating gui widgets from scratch) would be it.

In any case, the line in question is quite simple. It creates a
QApplication object, which is basically the engine that drives all Qt
applications. Once you call .run() on it, it takes over and handles all
the mouse events and such for you. In fact you do not have any control
over the program's execution from this point on, other than to define
event call-back methods or functions that are called by the widgets when
things happen, like mouse clicks.

All gui toolkits operate this way. You set up the widgets, then you run
the main engine or main event loop and control never returns to your
main program until something triggers the end (like closing a window or
the quit menu item is pressed).

Probably a complete working example is what you need to see, that is
documented. I primarily work with Gtk, but I'll whip up a Qt one
tomorrow if I can.
Click to expand...
Rusi is not the op, and his question is about these lines

app = None
if ( not app ):

not this one

app = QtGui.QApplication([])

which should be written like this

app = QtGui.QApplication(sys.argv)
 
D

Dennis Lee Bieber

the mouse events and such for you. In fact you do not have any control
over the program's execution from this point on, other than to define
event call-back methods or functions that are called by the widgets when
things happen, like mouse clicks.
Click to expand...
Technically, those event call-backs need to already have been
defined (or will be defined within an existing call-back). <G>
 
M

Michael Torrie

Rusi is not the op, and his question is about these lines

app = None
if ( not app ):
Click to expand...

Yeah that's a no-op. The original author of that code is clearly
confused there.
not this one

app = QtGui.QApplication([])

which should be written like this

app = QtGui.QApplication(sys.argv)
Click to expand...

Yeah. The QApplication not only is the main engine, but it also parses
the command-line for certain flags that influence Qt's behavior, similar
to gtk's main function that also parses command-line flags (specific to
gtk's operation).
 
D

Dennis Lee Bieber

Yeah that's a no-op. The original author of that code is clearly
confused there.
Click to expand...
I've wondered if the original sample had been much larger at one
time, and embedded in some sort of "auto-restart" loop (say, for a kiosk
application). In that situation, one would perhaps want the "app = None"
somewhere near the start to "wipe out" the previous GUI, and the "if"
was as a guard to prevent a second start-up [if there were some other
loop also in the code].
 

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