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[newbie] Python and Qt4 Designer

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  [newbie] Python and Qt4 Designer Jean Dubois <jeandubois314@gmail.com> - 2012-07-11 08:37 -0700
    Re: [newbie] Python and Qt4 Designer Vincent Vande Vyvre <vincent.vandevyvre@swing.be> - 2012-07-12 02:59 +0200
      Re: Python and Qt4 Designer Jean Dubois <jeandubois314@gmail.com> - 2012-07-11 23:42 -0700
        Re: Python and Qt4 Designer Vincent Vande Vyvre <vincent.vandevyvre@swing.be> - 2012-07-13 03:52 +0200
          Re: Python and Qt4 Designer Jean Dubois <jeandubois314@gmail.com> - 2012-07-13 14:12 -0700
            Re: Python and Qt4 Designer Michael Torrie <torriem@gmail.com> - 2012-07-14 08:45 -0600
              Re: Python and Qt4 Designer rusi <rustompmody@gmail.com> - 2012-07-14 10:13 -0700
                Re: Python and Qt4 Designer Michael Torrie <torriem@gmail.com> - 2012-07-14 23:31 -0600
                Re: Python and Qt4 Designer Vincent Vande Vyvre <vincent.vandevyvre@swing.be> - 2012-07-15 09:58 +0200
                Re: Python and Qt4 Designer Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-07-15 08:42 -0400
                Re: Python and Qt4 Designer Michael Torrie <torriem@gmail.com> - 2012-07-16 07:56 -0600
                Re: Python and Qt4 Designer Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-07-16 13:07 -0400
          Re: Python and Qt4 Designer Jean Dubois <jeandubois314@gmail.com> - 2012-07-13 14:12 -0700

#25175 — [newbie] Python and Qt4 Designer

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

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#25187

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_signals_slots.html

-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte+7
<https://launchpad.net/qarte+7> . PaQager <https://launchpad.net/paqager>

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#25202 — Re: Python and Qt4 Designer

On 12 jul, 02:59, Vincent Vande Vyvre <vincent.vandevy...@swing.be>
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

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#25235 — Re: Python and Qt4 Designer

On 12/07/12 08:42, Jean Dubois wrote:
> On 12 jul, 02:59, Vincent Vande Vyvre <vincent.vandevy...@swing.be>
> 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/

-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>

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#25292 — Re: Python and Qt4 Designer

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 <vincent.vandevy...@swing.be>
> > 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/
> 
> -- 
> Vincent V.V.
> Oqapy <https://launchpad.net/oqapy> . Qarte
> <https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>

Thanks for the extra docu references

regards,

jean

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#25313 — Re: Python and Qt4 Designer

On 07/13/2012 03:12 PM, Jean Dubois wrote:
> Thanks for the extra docu references

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

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#25314 — Re: Python and Qt4 Designer

On Jul 14, 7:45 pm, Michael Torrie <torr...@gmail.com> wrote:
> On 07/13/2012 03:12 PM, Jean Dubois wrote:
>
> > Thanks for the extra docu references
>
> 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.htmlhttp://bitesofcode.blogspot.ca/2011/10/comparison-of-loading-techniqu...

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

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#25337 — Re: Python and Qt4 Designer

On 07/14/2012 11:13 AM, rusi wrote:
> 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

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.

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#25339 — Re: Python and Qt4 Designer

On 15/07/12 07:31, Michael Torrie wrote:
> On 07/14/2012 11:13 AM, rusi wrote:
>> 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
> 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.
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)



-- 
Vincent V.V.
Oqapy <https://launchpad.net/oqapy> . Qarte
<https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>

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#25348 — Re: Python and Qt4 Designer

On Sat, 14 Jul 2012 23:31:38 -0600, Michael Torrie <torriem@gmail.com>
declaimed the following in gmane.comp.python.general:


> 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.
>
	Technically, those event call-backs need to already have been
defined (or will be defined within an existing call-back). <G>
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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#25417 — Re: Python and Qt4 Designer

On 07/15/2012 01:58 AM, Vincent Vande Vyvre wrote:
> Rusi is not the op, and his question is about these lines
> 
>     app = None
>     if ( not app ):

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)

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).

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#25427 — Re: Python and Qt4 Designer

On Mon, 16 Jul 2012 07:56:19 -0600, Michael Torrie <torriem@gmail.com>
declaimed the following in gmane.comp.python.general:

> On 07/15/2012 01:58 AM, Vincent Vande Vyvre wrote:
> > Rusi is not the op, and his question is about these lines
> > 
> >     app = None
> >     if ( not app ):
> 
> Yeah that's a no-op.  The original author of that code is clearly
> confused there.
>
	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].
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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#25293 — Re: Python and Qt4 Designer

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 <vincent.vandevy...@swing.be>
> > 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/
> 
> -- 
> Vincent V.V.
> Oqapy <https://launchpad.net/oqapy> . Qarte
> <https://launchpad.net/qarte> . PaQager <https://launchpad.net/paqager>

Thanks for the extra docu references

regards,

jean

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