GNU bug report logs - #21813
24.5; python.el & Qt (PySide) - widgets remain hidden

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Subject: 24.5; python.el & Qt (PySide) - widgets remain hidden
From: Angus Melville <anguscmelville@HIDDEN>
To: bug-gnu-emacs@HIDDEN
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--047d7bea3792dbcaca0523903862
Content-Type: text/plain; charset=UTF-8

The following lines should make a QT widget appear on the screen, and will
do if run direcly from IDLE or from iPython notebook:

import sys
from PySide import QtGui

app = QtGui.QApplication.instance()
if not app:
    app = QtGui.QApplication(sys.argv)

class Widget(QtGui.QDialog):
    def __init__(self):
        super().__init__()

widget = Widget()
widget.show()

sys.exit(app.exec_())

However if run from EMACS using the default python.el mode, no widget
will pop up on the screen.  This means that many Pyside programs, such
as example programs found at
https://github.com/nicoddemus/PySide-Examples/tree/master/examples when
run from EMACS will produce no response.

If we modify the program to embed a second widget within our main widget,
as below, the widget does pop up on the screen:

import sys
from PySide import QtGui

app = QtGui.QApplication.instance()
if not app:
    app = QtGui.QApplication(sys.argv)

class Widget1(QtGui.QDialog):
    def __init__(self):
        super().__init__()
        widget2 = Widget2()
        widget2.show()
        layout = QtGui.QVBoxLayout()
        layout.addWidget(widget2)
        self.setLayout(layout)

class Widget2(QtGui.QDialog):
    def __init__(self):
        super().__init__()

widget = Widget1()
widget.show()

sys.exit(app.exec_())


This suggests that perhaps in the first example the widget immediately goes
out of scope.

Thanks for any help

Angus M


In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.3.9600
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Memory information:
((conses 8 94209 6459)
 (symbols 32 19059 0)
 (miscs 32 95 138)
 (strings 16 16099 3431)
 (string-bytes 1 475380)
 (vectors 8 11678)
 (vector-slots 4 407444 2242)
 (floats 8 64 390)
 (intervals 28 363 54)
 (buffers 508 15))

--047d7bea3792dbcaca0523903862
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">The following lines should make a QT widget appear on the =
screen, and will do if run direcly from IDLE or from iPython notebook:<br><=
br>import sys<br>from PySide import QtGui<br><br>app =3D QtGui.QApplication=
.instance()<br>if not app:<br>=C2=A0=C2=A0=C2=A0 app =3D QtGui.QApplication=
(sys.argv)<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>class Widget(Q=
tGui.QDialog):<br>=C2=A0=C2=A0=C2=A0 def __init__(self):<br>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 super().__init__()<br><br>widget =3D Widget()<b=
r>widget.show()<br><br>sys.exit(app.exec_())<br><br>However if run from EMA=
CS using the default python.el mode, no widget<br>will pop up on the screen=
.=C2=A0 This means that many Pyside programs, such<br>as example programs f=
ound at<br><a href=3D"https://github.com/nicoddemus/PySide-Examples/tree/ma=
ster/examples">https://github.com/nicoddemus/PySide-Examples/tree/master/ex=
amples</a> when<br>run from EMACS will produce no response. <br><br>If we m=
odify the program to embed a second widget within our main widget, as below=
, the widget does pop up on the screen:<br><br>import sys<br>from PySide im=
port QtGui<br><br>app =3D QtGui.QApplication.instance()<br>if not app:<br>=
=C2=A0=C2=A0=C2=A0 app =3D QtGui.QApplication(sys.argv)<br>=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 <br>class Widget1(QtGui.QDialog):<br>=C2=A0=C2=
=A0=C2=A0 def __init__(self):<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 super().__init__()<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 widget2 =
=3D Widget2()<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 widget2.show()<=
br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 layout =3D QtGui.QVBoxLayout(=
)<br>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 layout.addWidget(widget2)<b=
r>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 self.setLayout(layout)<br><br>=
class Widget2(QtGui.QDialog):<br>=C2=A0=C2=A0=C2=A0 def __init__(self):<br>=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 super().__init__()<br><br>widget=
 =3D Widget1()<br>widget.show()<br><br>sys.exit(app.exec_())<br><br><br>Thi=
s suggests that perhaps in the first example the widget immediately goes ou=
t of scope.<br><br>Thanks for any help<br><br>Angus M<br><br><br>In GNU Ema=
cs 24.5.1 (i686-pc-mingw32)<br>=C2=A0of 2015-04-11 on LEG570<br>Windowing s=
ystem distributor `Microsoft Corp.&#39;, version 6.3.9600<br>Configured usi=
ng:<br>=C2=A0`configure --prefix=3D/c/usr --host=3Di686-pc-mingw32&#39;<br>=
<br>Important settings:<br>=C2=A0 value of $LANG: ENG<br>=C2=A0 locale-codi=
ng-system: cp1252<br><br>Major mode: Inferior Python<br><br>Minor modes in =
effect:<br>=C2=A0 compilation-shell-minor-mode: t<br>=C2=A0 tooltip-mode: t=
<br>=C2=A0 electric-indent-mode: t<br>=C2=A0 mouse-wheel-mode: t<br>=C2=A0 =
tool-bar-mode: t<br>=C2=A0 menu-bar-mode: t<br>=C2=A0 file-name-shadow-mode=
: t<br>=C2=A0 global-font-lock-mode: t<br>=C2=A0 font-lock-mode: t<br>=C2=
=A0 blink-cursor-mode: t<br>=C2=A0 auto-composition-mode: t<br>=C2=A0 auto-=
encryption-mode: t<br>=C2=A0 auto-compression-mode: t<br>=C2=A0 line-number=
-mode: t<br>=C2=A0 transient-mark-mode: t<br><br>Recent messages:<br>For in=
formation about GNU Emacs and the GNU system, type C-h C-a.<br>byte-code: E=
nd of buffer<br>completing-read-default: Command attempted to use minibuffe=
r while in minibuffer [3 times]<br>Making python-shell-interpreter local to=
 *Python* while let-bound!<br>Making python-shell-interpreter-args local to=
 *Python* while let-bound!<br>Sent python-shell-completion-setup-code<br>Se=
nt python-ffap-setup-code<br>Sent python-eldoc-setup-code<br><br>Load-path =
shadows:<br>None found.<br><br>Features:<br>(shadow sort gnus-util mail-ext=
r emacsbug message format-spec rfc822 mml<br>mml-sec mm-decode mm-bodies mm=
-encode mail-parse rfc2231 mailabbrev<br>gmm-utils mailheader sendmail rfc2=
047 rfc2045 ietf-drums mm-util<br>help-fns mail-prsvr mail-utils compile cl=
-extra python easymenu json<br>comint ring cl-loaddefs cl-lib ansi-color wa=
rnings package epg-config<br>time-date tooltip electric uniquify ediff-hook=
 vc-hooks lisp-float-type<br>mwheel dos-w32 ls-lisp w32-common-fns disp-tab=
le w32-win w32-vars<br>tool-bar dnd fontset image regexp-opt fringe tabulat=
ed-list newcomment<br>lisp-mode prog-mode register page menu-bar rfn-eshado=
w timer select<br>scroll-bar mouse jit-lock font-lock syntax facemenu font-=
core frame cham<br>georgian utf-8-lang misc-lang vietnamese tibetan thai ta=
i-viet lao<br>korean japanese hebrew greek romanian slovak czech european e=
thiopic<br>indian cyrillic chinese case-table epa-hook jka-cmpr-hook help s=
imple<br>abbrev minibuffer nadvice loaddefs button faces cus-face macroexp =
files<br>text-properties overlay sha1 md5 base64 format env code-pages mule=
<br>custom widget hashtable-print-readable backquote make-network-process<b=
r>w32notify w32 multi-tty emacs)<br><br>Memory information:<br>((conses 8 9=
4209 6459)<br>=C2=A0(symbols 32 19059 0)<br>=C2=A0(miscs 32 95 138)<br>=C2=
=A0(strings 16 16099 3431)<br>=C2=A0(string-bytes 1 475380)<br>=C2=A0(vecto=
rs 8 11678)<br>=C2=A0(vector-slots 4 407444 2242)<br>=C2=A0(floats 8 64 390=
)<br>=C2=A0(intervals 28 363 54)<br>=C2=A0(buffers 508 15))<br></div>

--047d7bea3792dbcaca0523903862--