pyqt4: setText() inside a function

[l.freschi]

I'm developing a PyQt4 application.

I have created a button:
....
self.start_button=QtGui.QPushButton("start simulation", self)
....

that is connected to a function:
....
self.connect(self.start_button, QtCore.SIGNAL('clicked()'),
self.simulate)
....

This is the function:
....
def simulate(self):

self.log_inspector.setText('')
cmds=['rm engine','make engine', './
engine']
first_cmd="./parser "+str(self.filename)
cmds.insert(0, first_cmd)
for cmd in cmds:
self.status_inspector.setText(cmd)
status, output = commands.getstatusoutput(cmd)
output_list=output.split("\n")
output_list.reverse()
output_def="\n".join(output_list)
if status != 0:
self.log_inspector.setText(cmd"...
[ERROR]\n"+output_def)
return
self.status_inspector.setText("Done!")
....

I would like to change the value of status_inspector (It's a QLabel)
during the execution of the function.
Is it possible?

I'm a newbie with PyQt and OOP!

Thank you!

Luca

 

[Diez B. Roggisch]

I'm developing a PyQt4 application.

I have created a button:
...
self.start_button=QtGui.QPushButton("start simulation", self)
...

that is connected to a function:
...
self.connect(self.start_button, QtCore.SIGNAL('clicked()'),
self.simulate)
...

This is the function:
...
def simulate(self):

self.log_inspector.setText('')
cmds=['rm engine','make engine', './
engine']
first_cmd="./parser "+str(self.filename)
cmds.insert(0, first_cmd)
for cmd in cmds:
self.status_inspector.setText(cmd)
status, output = commands.getstatusoutput(cmd)
output_list=output.split("\n")
output_list.reverse()
output_def="\n".join(output_list)
if status != 0:
self.log_inspector.setText(cmd"...
[ERROR]\n"+output_def)
return
self.status_inspector.setText("Done!")
...

I would like to change the value of status_inspector (It's a QLabel)
during the execution of the function.
Is it possible?

If you want GUI-updates while performing time-consuming tasks, you need
to make sure Qt's event-loop get's called every now and then. This
should help you:

void QCoreApplication:rocessEvents ( QEventLoop:rocessEventsFlags
flags = QEventLoop::AllEvents ) [static]


Diez

 

[l.freschi]

(e-mail address removed) schrieb:

I'm developing a PyQt4 application.

I have created a button:
...
self.start_button=QtGui.QPushButton("start simulation", self)
...

that is connected to a function:
...
self.connect(self.start_button, QtCore.SIGNAL('clicked()'),
self.simulate)
...

This is the function:
...
def simulate(self):

                self.log_inspector.setText('')
                cmds=['rm engine','make engine', './
engine']
                first_cmd="./parser "+str(self.filename)
                cmds.insert(0, first_cmd)
                for cmd in cmds:
                        self.status_inspector.setText(cmd)
                        status, output = commands.getstatusoutput(cmd)
                        output_list=output.split("\n")
                        output_list.reverse()
                        output_def="\n".join(output_list)
                        if status != 0:
                                self.log_inspector.setText(cmd"...
[ERROR]\n"+output_def)
                                return
                self.status_inspector.setText("Done!")
...

I would like to change the value of status_inspector (It's a QLabel)
during the execution of the function.
Is it possible?

If you want GUI-updates while performing time-consuming tasks, you need
to make sure Qt's event-loop get's called every now and then. This
should help you:

void QCoreApplication:rocessEvents ( QEventLoop:rocessEventsFlags
flags = QEventLoop::AllEvents )   [static]

Diez

It works! I added:
application_object.processEvents()


Thank you Diez!


def simulate(self):

self.log_inspector.setText('')
cmds=['rm engine','make engine', './
engine']
first_cmd="./parser "+str(self.filename)
cmds.insert(0, first_cmd)
for cmd in cmds:
self.status_inspector.setText(cmd)
application_object.processEvents()
status, output = commands.getstatusoutput(cmd)
output_list=output.split("\n")
output_list.reverse()
output_def="\n".join(output_list)
if status != 0:
self.log_inspector.setText(cmd"...
[ERROR]\n"+output_def)
return
self.status_inspector.setText("Done!")