getopenfilename does not block when when using ipython inputhook/start_event_loop #7301
Description
This is very similar to #2380. However, since that issue, and related ones, are all closed, I'm presenting this similar issue, which has already been posted on Stack Overflow
Note: If not using the native dialog option, all works fine. This is just when using the native dialog.
When trying to run Qt in iPython, using the inputhook and start_event_loop, to create non-blocking app, the function PyQt4.QtGui.QFileDialog.getOpenFileName does not allow for input. It pops up and immediately closes.
The code below demonstrates the behavior. If run through _main(), which starts the Qt eventloop normally, all works fine. Both the generic Dialog and FileDialog operate as expected.
However, when run as
$ ipython
In [1]: import ipython_nonblock_example as nb
In [2]: nb_instance = nb.start_gui(nb.Example)
the Dialog works as expected. But the FileDialog does the open/close behavior.
Versions are: IPython 2.3.1, Qt 4.8, PyQt4 4.11.1,Python 2.7.5
File ipython_nonblock_example.py
import sys
from PyQt4 import QtGui, QtCore
class Example(QtGui.QMainWindow):
def __init__(self):
super(Example, self).__init__()
self.initUI()
def initUI(self):
self.btn = QtGui.QPushButton('Dialog', self)
self.btn.move(20, 20)
self.btn.clicked.connect(self.showDialog)
self.btn2 = QtGui.QPushButton('File', self)
self.btn2.move(20,50)
self.btn2.clicked.connect(self.showFile)
self.le = QtGui.QLineEdit(self)
self.le.move(130, 22)
self.setGeometry(300, 300, 290, 150)
self.setWindowTitle('Input dialog')
self.show()
def showDialog(self):
text, ok = QtGui.QInputDialog.getText(self, 'Input Dialog',
'Enter your name:')
if ok:
self.le.setText(str(text))
def showFile(self):
file_name = str(QtGui.QFileDialog.getOpenFileName(parent=self, caption='Open file'))
if file_name:
self.le.setText(str(file_name))
def start_gui(ui, block=False):
try:
if not block & __IPYTHON__:
from IPython.lib.inputhook import enable_gui
app = enable_gui('qt4')
else:
raise ImportError
except (ImportError, NameError):
app = QtCore.QCoreApplication.instance()
if app is None:
app = QtGui.QApplication(sys.argv)
ui_instance = ui()
try:
from IPython.lib.guisupport import start_event_loop_qt4
start_event_loop_qt4(app)
return ui_instance
except ImportError:
app.exec_()
def _main():
start_gui(Example, block=True)
if __name__ == '__main__':
_main()