On 16 Mrz., 21:56, Hugo Parente Lima <[email protected]> wrote:
> On Wednesday 16 March 2011 08:27:59 Markus Hubig wrote:
>
> > Now, what I wanna do is to update a progessbar every time I'm entering
> > a new State. The Problem is that I'm running thru my StateMachine but
> > the progessbar is updated only _after_ the QStateMachine is finished!
>
> > So what I'm missing here?
>
> You need to give Qt a chance to process the events, when you call
> machine.start() the machine starts, change states and until it finishes Qt
> doesn't process any event, so the GUI isn't updated.
>
> There's two possibilities to fix this:
>
> - Put your state machine code into a separated thread.
Thanks for this tip!
Now I've putted my QStateMachine into a separate thread, as you
suggested,
and it works ... mostly. Now if I start my application I get two error
messages:
1. QMetaObject::connectSlotsByName: No matching signal for
on_progress()
2. QObject::setParent: Cannot set parent, new parent is in a different
thread
Msg 1 appears when I start the application. Msg 2 when I press the
start Button.
But the application is running fine. While msg 1 is surely something
related to
the multi inheritance in my application but what's the course of Msg
2?
Hope someone has a tip for me ... ;-)
- Markus
--------------------8<----schnipp---------------------------------
import time
import threading
import platform
from PySide import QtCore
from PySide import QtGui
from ui_trimeibt import Ui_mainWindow
__version__ = '0.0.1'
class MainWindow(QtGui.QMainWindow, Ui_mainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
self._progress = 0
self._running = False
self.startButton.clicked.connect(self._start_machine)
self.on_progress.connect(self._update_progressbar)
def _update_progressbar(self):
self.progressBar_DUT1.setValue(self.progress)
def _reset_progressbar(self):
print "RESET"
self.progressBar_DUT1.reset()
def _state_machine(self):
machine = QtCore.QStateMachine(self)
machine.finished.connect(self._reset_progressbar)
prepare = QtCore.QState()
prepare.entered.connect(self.prepare_dut())
flash = QtCore.QState()
flash.entered.connect(self.flash_dut())
config = QtCore.QState()
config.entered.connect(self.config_dut())
finish = QtCore.QFinalState()
finish.entered.connect(self.finish_dut())
prepare.addTransition(flash)
flash.addTransition(config)
config.addTransition(finish)
machine.addState(prepare)
machine.addState(flash)
machine.addState(config)
machine.addState(finish)
machine.setInitialState(prepare)
machine.start()
def prepare_dut(self):
print "State 1: Prepare DUT"
self.progress = 20
time.sleep(1)
def flash_dut(self):
print "State 2: Flash DUT"
self.progress = 50
time.sleep(1)
def config_dut(self):
print "State 3: Config DUT"
self.progress = 70
time.sleep(1)
def finish_dut(self):
print "State 4: DUT finished!"
self.progress = 100
time.sleep(1)
@QtCore.Slot()
def _start_machine(self):
if not self._running:
self._running = True
thread = threading.Thread(target=self._state_machine)
thread.start()
def _get_progress(self):
return self._progress
def _set_progress(self, progress):
self._progress = progress
self.on_progress.emit()
on_progress = QtCore.Signal()
progress = QtCore.Property(int, _get_progress, _set_progress,
notify=on_progress)
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
frame = MainWindow()
frame.show()
app.exec_()
--------------------8<----schnapp---------------------------------
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