What I have to handle a close doesn't seem to work. The error I get when running this is:
Error: AttributeError: file line 82: 'Ui_Dialog' object has no attribute 'close'
from PySide import QtCore, QtGui, QtUiTools
import maya.cmds as cmds
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName(_fromUtf8("Dialog"))
Dialog.resize(400, 300)
self.label = QtGui.QLabel(Dialog)
self.label.setGeometry(QtCore.QRect(60, 20, 131, 16))
font = QtGui.QFont()
font.setBold(True)
font.setWeight(75)
self.label.setFont(font)
self.label.setObjectName(_fromUtf8("label"))
............
................
..................
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
self.swapRefBtn.clicked.connect(self.swapRefBtn_clicked)
self.closeBtn.clicked.connect(self.close()) <---- THIS HERE WON'T WORK
def retranslateUi(self, Dialog):
............
................
..................
def swapRefBtn_clicked(self):
pass
if __name__ == "__main__":
import sys
app = QtGui.QApplication.instance()
if app is None:
app = QtGui.QApplication(sys.argv)
Dialog = QtGui.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
app.exec_()
Perhaps you want to connect the close button to QDialog.accept or QDialog.reject slot.
As for how to handle them:
Example
import sys
import PyQt4.QtGui as qg
class Dialog(qg.QDialog):
def __init__(self):
super().__init__()
self.setup_widgets()
def setup_widgets(self):
self.ok = qg.QPushButton('OK')
self.ok.clicked.connect(self.accept)
self.cancel = qg.QPushButton('Cancel')
self.cancel.clicked.connect(self.reject)
layout = qg.QHBoxLayout()
layout.addWidget(self.ok)
layout.addWidget(self.cancel)
self.setLayout(layout)
def accept(self):
# Your logic here
super().accept()
def reject(self):
response = qg.QMessageBox.warning(self, 'Warning', 'Cancel?',
qg.QMessageBox.Yes | qg.QMessageBox.No)
if response == qg.QMessageBox.Yes:
super().reject()
if __name__ == '__main__':
app = qg.QApplication(sys.argv)
dialog = Dialog()
dialog.show()
sys.exit(app.exec_())
See also: QDialog.done()
Related
i try to sequence some actions in urwid
I made a timer which run in background and communicate with the mainprocess
like this:
from multiprocessing import Process, Pipe
import time
import urwid
def show_or_exit(key):
if key in ('q', 'Q'):
raise urwid.ExitMainLoop()
class midiloop(urwid.Frame):
def __init__(self):
self.message = urwid.Text('Press Space', align='center')
self.filler = urwid.Filler(self.message, "middle")
super().__init__(urwid.Frame(self.filler))
def keypress(self, size, key):
if key == " ":
self.seq()
else:
return key
def timer(self,conn):
x = 0
while True:
if (conn.poll() == False):
pass
else:
z = conn.recv()
if (z == "kill"):
return()
conn.send(x)
x+=1
time.sleep(0.05)
def seq(self):
self.parent_conn, self.child_conn = Pipe()
self.p = Process(target=self.timer, args=(self.child_conn,))
self.p.start()
while True:
if (self.parent_conn.poll(None)):
self.y = self.parent_conn.recv()
self.message.set_text(str(self.y))
loop.draw_screen()
if ( self.y > 100 ):
self.parent_conn.send("kill")
self.message.set_text("Press Space")
return()
if __name__ == '__main__':
midiloop = midiloop()
loop = urwid.MainLoop(midiloop, unhandled_input=show_or_exit, handle_mouse=True)
loop.run()
The problem is i'm blocking urwid mainloop with while True:
So anyone can give me a solution to listen for key Q to quit the program before it reachs the end of the loop for example and more generally to interact with urwid and communicate with the subprocess
It seems to be rather complicated to combine multiprocessing and urwid.
Since you're using a timer and your class is called midiloop, I'm going to guess that maybe you want to implement a mini sequencer.
One possible way of implementing that is using an asyncio loop instead of urwid's MainLoop, and schedule events with the loop.call_later() function. I've implemented a simple drum machine with that approach in the past, using urwid for drawing the sequencer, asyncio for scheduling the play events and simpleaudio to play. You can see the code for that here: https://github.com/eliasdorneles/kickit
If you still want to implement communication with multiprocessing, I think your best bet is to use urwid.AsyncioEventLoop and the aiopipe helper for duplex communication.
It's not very minimal I'm afraid. However I did spend a day writing this Urwid frontend that starts, stops and communicates with a subprocess.
import os
import sys
from multiprocessing import Process, Pipe, Event
from collections import deque
import urwid
class suppress_stdout_stderr(object):
"""
Supresses the stdout and stderr by piping them to dev null...
The same place I send bad faith replies to my tweets
"""
def __enter__(self):
self.outnull_file = open(os.devnull, 'w')
self.errnull_file = open(os.devnull, 'w')
self.old_stdout_fileno_undup = sys.stdout.fileno()
self.old_stderr_fileno_undup = sys.stderr.fileno()
self.old_stdout_fileno = os.dup(sys.stdout.fileno())
self.old_stderr_fileno = os.dup(sys.stderr.fileno())
self.old_stdout = sys.stdout
self.old_stderr = sys.stderr
os.dup2(self.outnull_file.fileno(), self.old_stdout_fileno_undup)
os.dup2(self.errnull_file.fileno(), self.old_stderr_fileno_undup)
sys.stdout = self.outnull_file
sys.stderr = self.errnull_file
return self
def __exit__(self, *_):
sys.stdout = self.old_stdout
sys.stderr = self.old_stderr
os.dup2(self.old_stdout_fileno, self.old_stdout_fileno_undup)
os.dup2(self.old_stderr_fileno, self.old_stderr_fileno_undup)
os.close(self.old_stdout_fileno)
os.close(self.old_stderr_fileno)
self.outnull_file.close()
self.errnull_file.close()
def subprocess_main(transmit, stop_process):
with suppress_stdout_stderr():
import time
yup = ['yuuuup', 'yuuuuup', 'yeaup', 'yeoop']
nope = ['noooooooe', 'noooope', 'nope', 'nope']
mesg = 0
i = 0
while True:
i = i % len(yup)
if transmit.poll():
mesg = transmit.recv()
if mesg == 'Yup':
transmit.send(yup[i])
if mesg == 'Nope':
transmit.send(nope[i])
if stop_process.wait(0):
break
i += 1
time.sleep(2)
class SubProcess:
def __init__(self, main):
"""
Handles forking, stopping and communication with a subprocess
:param main: subprocess method to run method signature is
def main(transmit, stop_process):
transmit: is a multiprocess Pipe to send data to parent process
stop_process: is multiprocess Event to set when you want the process to exit
"""
self.main = main
self.recv, self.transmit = None, None
self.stop_process = None
self.proc = None
def fork(self):
"""
Forks and starts the subprocess
"""
self.recv, self.transmit = Pipe(duplex=True)
self.stop_process = Event()
self.proc = Process(target=self.main, args=(self.transmit, self.stop_process))
self.proc.start()
def write_pipe(self, item):
self.recv.send(item)
def read_pipe(self):
"""
Reads data sent by the process into a list and returns it
:return:
"""
item = []
if self.recv is not None:
try:
while self.recv.poll():
item += [self.recv.recv()]
except:
pass
return item
def stop(self):
"""
Sets the event to tell the process to exit.
note: this is co-operative multi-tasking, the process must respect the flag or this won't work!
"""
self.stop_process.set()
self.proc.join()
class UrwidFrontend:
def __init__(self, subprocess_main):
"""
Urwid frontend to control the subprocess and display it's output
"""
self.title = 'Urwid Frontend Demo'
self.choices = 'Start Subprocess|Quit'.split('|')
self.response = None
self.item = deque(maxlen=10)
self.event_loop = urwid.SelectEventLoop()
# start the heartbeat
self.event_loop.alarm(0, self.heartbeat)
self.main = urwid.Padding(self.main_menu(), left=2, right=2)
self.top = urwid.Overlay(self.main, urwid.SolidFill(u'\N{MEDIUM SHADE}'),
align='center', width=('relative', 60),
valign='middle', height=('relative', 60),
min_width=20, min_height=9)
self.loop = urwid.MainLoop(self.top, palette=[('reversed', 'standout', ''), ], event_loop=self.event_loop)
self.subprocess = SubProcess(subprocess_main)
def exit_program(self, button):
raise urwid.ExitMainLoop()
def main_menu(self):
body = [urwid.Text(self.title), urwid.Divider()]
for c in self.choices:
button = urwid.Button(c)
urwid.connect_signal(button, 'click', self.handle_button, c)
body.append(urwid.AttrMap(button, None, focus_map='reversed'))
return urwid.ListBox(urwid.SimpleFocusListWalker(body))
def subproc_menu(self):
self.response = urwid.Text('Waiting ...')
body = [self.response, urwid.Divider()]
choices = ['Yup', 'Nope', 'Stop Subprocess']
for c in choices:
button = urwid.Button(c)
urwid.connect_signal(button, 'click', self.handle_button, c)
body.append(urwid.AttrMap(button, None, focus_map='reversed'))
listbox = urwid.ListBox(urwid.SimpleFocusListWalker(body))
return listbox
def update_subproc_menu(self, text):
self.response.set_text(text)
def handle_button(self, button, choice):
if choice == 'Start Subprocess':
self.main.original_widget = self.subproc_menu()
self.subprocess.fork()
self.item = deque(maxlen=10)
if choice == 'Stop Subprocess':
self.subprocess.stop()
self.main.original_widget = self.main_menu()
if choice == 'Quit':
self.exit_program(button)
if choice == 'Yup':
self.subprocess.write_pipe('Yup')
if choice == 'Nope':
self.subprocess.write_pipe('Nope')
def heartbeat(self):
"""
heartbeat that runs 24 times per second
"""
# read from the process
self.item.append(self.subprocess.read_pipe())
# display it
if self.response is not None:
self.update_subproc_menu(['Subprocess started\n', f'{self.item}\n', ])
self.loop.draw_screen()
# set the next beat
self.event_loop.alarm(1 / 24, self.heartbeat)
def run(self):
self.loop.run()
if __name__ == "__main__":
app = UrwidFrontend(subprocess_main)
app.run()
How can I set signal handler in target function?
multiprocessing.Process (cur_process in GUI) object would created and start when user click start button.
After that when user click stop button, I need to kill process gracefully.(send SIGTERM to cur_process when click stop button)
However, I am using Webdriver, so I want to quit Webdriver before kill process.
So I tried set signal handler in target function (test_main) but does not handle SIGTERM despite click stop button.
How I can set signal handler in Process target function?
import tkinter as tk
from multiprocessing import Process
from tkinter import messagebox
import sys
import signal
import time
import os
from selenium.webdriver.support.wait import WebDriverWait
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support import expected_conditions as EC
def create_driver():
options = Options()
if sys.platform == "darwin":
options.binary_location = '/Applications/Google Chrome Canary.app/Contents/MacOS/Google Chrome Canary'
#options.add_experimental_option("detach", True)
if sys.platform == "win32":
options.binary_location = "C:\\(user_home)\\AppData\\Local\\Google\\Chrome SxS\\Application\\chrome.exe" #location of chrome canary for windows
options.add_argument('--headless')
#options.add_argument('--disable-gpu')
options.add_argument('--reduce-security-for-testing')
options.add_argument('--allow-insecure-localhost')
if sys.platform == "win32":
chromedriver_path = r".\chromedriver"
else:
chromedriver_path = "./chromedriver"
driver = webdriver.Chrome(chromedriver_path, chrome_options=options)
return driver
class GUI(tk.Frame):
def __init__(self, master=None):
super().__init__(master)
self.cur_process = None
self.pack()
self.create_widget()
def create_widget(self):
self.start = tk.Button(self, width=5, padx=10, pady=3)
self.start["text"] = "Start"
self.start["command"] = self.start_event
self.start.grid(row=2, column=2, columnspan=2, padx=4, pady=10)
self.quit = tk.Button(self, width=5, padx=10, pady=3)
self.quit["text"] = "Stop"
self.quit["command"] = self.stop_event
self.quit.grid(row=3, column=2, columnspan=2, padx=4, pady=10)
def start_event(self):
if self.cur_process is None:
self.cur_process = Process(target=test_main) #target function
self.cur_process.start()
def stop_event(self):
if self.cur_process != None:
os.kill(self.cur_process.pid, signal.SIGTERM)
# self.driver.quit()
self.cur_process = None
def test_main(): #target function
# set signal handler to SIGTERM
def k():
print("set new signal handler")
try:
driver.quit()
# then terminate process
except NameError:# driver is not defined
pass # do nothing
sys.exit() # terminate process
signal.signal(signal.SIGTERM, k)
# do something with driver
driver = create_driver()
def gui():
root = tk.Tk()
root.geometry("400x300")
g = GUI(master=root)
g.mainloop()
if __name__ == "__main__":
gui()
The following script is part of a more complex one. I have taken out some parts just for simplification.
My aim is to insert a textedit field that captures the print output of the command window (when the pushbutton is pressed) and displays it inside the text field while the program is executing.
The suggestions I found are too much aimed at scripts that have no other functions. But my script is already quite complex and I don’t want to change it from the beginning or rewrite the whole script.
Does anyone have an idea on how to include the function in the script in a relatively simple way? I have tried it without success.
Any kind help would be appreciated.
import sys
import subprocess
from PyQt4 import QtCore, QtGui
class MainWindow(QtGui.QMainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.win_widget = WinWidget(self)
widget = QtGui.QWidget()
layout = QtGui.QVBoxLayout(widget)
layout.addWidget(self.win_widget)
self.setCentralWidget(widget)
self.statusBar().showMessage('Ready')
self.setGeometry(300, 300, 450, 250)
self.setWindowTitle('capture PyQt output')
self.setWindowIcon (QtGui.QIcon('logo.png'))
self.show()
class WinWidget (QtGui.QWidget) :
def __init__(self, parent):
super (WinWidget , self).__init__(parent)
self.controls()
self.grid_layout()
self.capture_output()
def controls(self):
self.btn_newSearch = QtGui.QPushButton('capture PyQt output', self)
self.btn_newSearch.clicked.connect(self.some_funtion)
self.btn_newSearch.setFont(QtGui.QFont('CourierNew', 12 , QtGui.QFont.Bold,False))
def capture_output (self) :
# HERE I WANT TO PUT A (IF POSSIBLE SIMPLE) SCRIPT TO CAPTURE
COOMAND WINDOW OUTPUT
something like:
self.text_box = QtGui.QPlainTextEdit()
text= capured output
self.text_box.setPlainText(text)
def grid_layout (self) :
grid = QtGui.QGridLayout()
grid.setSpacing(2)
grid.addWidget(self.btn_newSearch , 1 , 1)
grid.addWidget(self.text_box , 2 , 1)
self.setLayout(grid)
def some_funtion (self) :
print "hello world"
def main():
app = QtGui.QApplication(sys.argv)
win = MainWindow()
win.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
I have reproduced the "Custom Completer Example" from the Qt documentation using PySide
(Python 2.7.3, PySide 1.1.2, Qt 4.8.1).
I have an issue where a win32 exception is thrown on exit (or on Mac OS X a access violation exception).
On the Mac I can see a stack trace and the issue occurs during garbage collection, where references to QObjects are apparently not consistent, such that things go bad.
I can see this crash with the following self-contained script, only if a completer insertion was accepted. I.e. type the first few letters, then accept the completion.
On the other hand, if I have seen the completion list popup, but not accepted the completion, no crash occurs on exit.
################################################################################
# Completer.py
#
# A PySide port of the Qt 4.8 "Custom Completer Example"
# http://qt-project.org/doc/qt-4.8/tools-customcompleter.html
#
################################################################################
from PySide.QtCore import *
from PySide.QtGui import *
class TextEdit(QPlainTextEdit):
def __init__(self, parent=None):
super(TextEdit, self).__init__(parent)
self.c = None
def completer(self):
return self.c
def setCompleter(self, completer):
if self.c:
QObject.disconnect(self.c, 0, self, 0)
self.c = completer
if not self.c:
return
self.c.setWidget(self)
self.c.setCompletionMode(QCompleter.PopupCompletion)
self.c.setCaseSensitivity(Qt.CaseInsensitive)
self.c.activated.connect(self.insertCompletion)
def insertCompletion(self, completion):
if self.c.widget() is not self:
return
tc = self.textCursor()
extra = len(completion) - len(self.c.completionPrefix())
tc.movePosition(QTextCursor.Left)
tc.movePosition(QTextCursor.EndOfWord)
tc.insertText(completion[-extra:])
self.setTextCursor(tc)
def textUnderCursor(self):
tc = self.textCursor()
tc.select(QTextCursor.WordUnderCursor)
return tc.selectedText()
def focusInEvent(self, event):
if self.c:
self.c.setWidget(self)
super(TextEdit, self).focusInEvent(event)
def keyPressEvent(self, e):
if self.c and self.c.popup().isVisible():
if e.key() in (Qt.Key_Enter,
Qt.Key_Return,
Qt.Key_Escape,
Qt.Key_Tab,
Qt.Key_Backtab):
e.ignore()
return
# Check for the shortcut combination Ctrl+E
isShortcut = (e.modifiers() & Qt.ControlModifier) and e.key() == Qt.Key_E
# Do not process the shortcut when we have a completion
if not self.c or not isShortcut:
super(TextEdit, self).keyPressEvent(e)
noText = not e.text()
ctrlOrShift = e.modifiers() & (Qt.ControlModifier | Qt.ShiftModifier)
if not self.c or (ctrlOrShift and noText):
return
eow = "~!##$%^&*()_+{}|:\"<>?,./;'[]\\-=" # End of word
hasModifier = (e.modifiers() != Qt.NoModifier) and not ctrlOrShift
completionPrefix = self.textUnderCursor()
if not isShortcut and \
(hasModifier or noText or len(completionPrefix) < 1 or e.text()[-1:] in eow):
self.c.popup().hide()
return
if completionPrefix != self.c.completionPrefix():
self.c.setCompletionPrefix(completionPrefix)
self.c.popup().setCurrentIndex( self.c.completionModel().index(0,0) )
cr = self.cursorRect()
cr.setWidth(self.c.popup().sizeHintForColumn(0) + \
self.c.popup().verticalScrollBar().sizeHint().width())
self.c.complete(cr)
class Completer(QMainWindow):
words = ("one",
"two",
"three",
"four")
def __init__(self, parent=None):
super(Completer, self).__init__(parent)
self.setWindowTitle("Completer")
self.textEdit = TextEdit()
self.completer = QCompleter(self)
self.completer.setModelSorting(QCompleter.CaseInsensitivelySortedModel)
self.completer.setCaseSensitivity(Qt.CaseInsensitive)
self.completer.setWrapAround(False)
self.completer.setModel(QStringListModel(Completer.words, self.completer))
self.textEdit.setCompleter(self.completer)
self.setCentralWidget(self.textEdit)
self.resize(500, 300)
self.setWindowTitle("Completer")
if __name__ == '__main__':
import sys
from PySide.QtGui import QApplication
app = QApplication(sys.argv)
window = Completer()
window.show()
sys.exit(app.exec_())
I am new to programming, and I am having trouble finding a tutorial that teaches how to create a GUI that uses multiple windows. For example, If a user clicks a "lookup" button, a window pops up with the search results. How do I accomplish this? Is this possible within Tkinter?
Any suggestions/ references to sources would be greatly appreciated.
Thanks.
To create your first window, you create an instance of the Tk class. All other windows are instances of Toplevel.
import Tkinter as tk
class Example(tk.Frame):
def __init__(self, root):
tk.Frame.__init__(self, root)
b1 = tk.Button(self, text="Add another window", command = self.newWindow)
b1.pack(side="top", padx=40, pady=40)
self.count = 0
def newWindow(self):
self.count += 1
window = tk.Toplevel(self)
label = tk.Label(window, text="This is window #%s" % self.count)
label.pack(side="top", fill="both", expand=True, padx=40, pady=40);
if __name__ == "__main__":
root = tk.Tk()
Example(root).pack(side="top", fill="both", expand=True)
root.mainloop()
import tkinter as tk
from tkinter import *
class Example(tk.Frame):
def __init__(self, root):
tk.Frame.__init__(self, root)
# b1 = tk.Button(self, text="Add another window", command = self.newWindow)
self.count = 0
self.canvas1 = Canvas(self, width=500, height=500)
b1 = tk.Button(self.canvas1, text="Add another window", command = self.create_new_window)
# b1.pack(side="top", padx=40, pady=40)
self.canvas1.pack(side="top")
b1.pack(side="top", padx=250, pady=240)
def create_new_window(self):
self.window1 = tk.Toplevel(self)
self.window1.geometry("+160+300")
self.canvas1 = Canvas(self.window1, width=50, height=500)
# label = tk.Label(self.window1, text="This is window #%s" % self.count)
self.canvas1.pack(side="top", fill="both")
def create_new_window2(self):
self.window2 = tk.Toplevel(self)
self.canvas2 = Canvas(self.window2, width=500, height=500)
# label = tk.Label(self.window2, text="This is window #%s" % self.count)
self.canvas2.pack(side="top", fill="both", expand=True, padx=40, pady=40)
if __name__ == "__main__":
root = tk.Tk()
root.geometry("+300+300")
Example(root).pack(side="top", fill="both", expand=True)
root.mainloop()