Upon calling the show method on simple the simple window does not show. Why doesn't my Simple window show. :(
import sys
from PyQt4 import QtGui
class Widget(QtGui.QWidget):
def __init__(self):
super(Widget, self).__init__()
simple = Simple()
button = QtGui.QPushButton("Button", self)
button.clicked.connect(simple.show)
self.show()
class Simple(QtGui.QWidget):
def __init__(self):
super(Simple, self).__init__()
self.setGeometry(300, 250, 250, 150)
self.setWindowTitle("Simple Widget")
if __name__ =="__main__":
app = QtGui.QApplication(sys.argv)
widget = Widget()
sys.exit(app.exec_())
Please Help!
The problem with your code is that, simple in __init__ method of class Widget is a local variable, so as soon as the __init__ method finishes execution, the simple object is destroyed by the python Garbage Collector, thus the window does not appear because the object does not exist in the memory. To solve your problem, just add self at the starting of the simple variable to make it member variable.
...
self.simple = Simple()
button = QtGui.QPushButton("Button", self)
button.clicked.connect(self.simple.show)
...
Related
I am trying to figure out a way to make a decent copy to clipboard button function where I can copy text values from other threads inside a QTextEdit widget.
I pull the values from other threads and display them in a QTextEdit widget and have been trying to successfully copy to clipboard the contents of QTextEdit with a button but the only way I have been able to is my code below.
What I don't like is that the copy button makes a second call in order to copy the contents.
Is there some way that the values can be stored from the first request using the get_button button and be available to copy with the copy button without having to make the same call all over again? Thanks.
from PyQt4 import QtCore, QtGui
import sys
class WorkerThread(QtCore.QThread):
get_String = QtCore.pyqtSignal(str)
def __init__(self):
super(WorkerThread, self).__init__()
def run(self):
self.get_String.emit('Some text.')
class GUI(QtGui.QWidget):
def __init__(self):
super(GUI, self).__init__()
self.get_Button = QtGui.QPushButton('Get')
self.c_Button = QtGui.QPushButton('Copy')
self.text_Box = QtGui.QTextEdit(self)
vbox = QtGui.QVBoxLayout(self)
vbox.addWidget(self.get_Button)
vbox.addWidget(self.c_Button)
vbox.addWidget(self.text_Box)
vbox.addStretch()
self.setGeometry(300, 300, 300, 300)
self.show()
self._thread = WorkerThread()
self.get_Button.clicked.connect(self.doIt)
self._thread.get_String.connect(self.text_Box.append)
self.c_Button.clicked.connect(self.copy_Stuff)
def copy_Stuff(self):
self.clipboard = QtGui.QApplication.clipboard()
self._thread.get_String.connect(self.clipboard.setText)
self._thread.start()
def doIt(self):
self.text_Box.clear()
self.text_Box.setText('')
self._thread.start()
def main():
app = QtGui.QApplication(sys.argv)
gui = GUI()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
It turns out this was much easier than I initially thought. I was confused with how to copy text correctly because of all of the different ways I seen it done in other examples and posts. After reading the docs for awhile and trying to learn a bit more about pyqt I seen that it was as easy as using these 2 lines...
self.text_Box.selectAll()
self.text_Box.copy()
with those 2 lines and my button it seems to copy all the contents of the QTextEdit widget which is all I really needed. Here is my final working code in case someone else may find it useful.
from PyQt4 import QtCore, QtGui
import sys
class WorkerThread(QtCore.QThread):
get_String = QtCore.pyqtSignal(str)
def __init__(self):
super(WorkerThread, self).__init__()
def run(self):
self.get_String.emit('Some text.')
class GUI(QtGui.QWidget):
def __init__(self):
super(GUI, self).__init__()
self.get_Button = QtGui.QPushButton('Get')
self.c_Button = QtGui.QPushButton('Copy')
self.text_Box = QtGui.QTextEdit(self)
vbox = QtGui.QVBoxLayout(self)
vbox.addWidget(self.get_Button)
vbox.addWidget(self.c_Button)
vbox.addWidget(self.text_Box)
vbox.addStretch()
self.setGeometry(300, 300, 300, 300)
self.show()
self._thread = WorkerThread()
self.get_Button.clicked.connect(self.doIt)
self._thread.get_String.connect(self.text_Box.append)
self.c_Button.clicked.connect(self.copy_Stuff)
def copy_Stuff(self):
self.text_Box.selectAll()
self.text_Box.copy()
def doIt(self):
self.text_Box.clear()
self.text_Box.setText('')
self._thread.start()
def main():
app = QtGui.QApplication(sys.argv)
gui = GUI()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
This code example shows a simple working thread with signal that returns a value to the main, displays the value in a QTextEdit widget and how to copy all of the contents of a QTextEdit widget with a single button click.
~EDIT (original question still below)~ when I remove the self.setGeometry() call in the new window it works as it should. Why is that? I'm still building out the UI for it, but once I do I hope I don't continue to have this problem...
~EDIT 2~ Just realized it should be self.resize() not self.setGeometry()...
self.solved()
:(
I'm just learning PyQt5 and just doing a little messing around. For some reason when I try to open a new window from the main application window, the whole thing closes. Putting in some print statements to track progress shows that it's not actually creating the new window either.
Main Window code:
import sys
from PyQt5.QtWidgets import QMainWindow, QAction, QApplication
from newLeague import *
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
newLeagueAction = QAction('Create New League', self)
newLeagueAction.setShortcut('Ctrl+N')
newLeagueAction.setStatusTip('Create a new league from scratch')
newLeagueAction.triggered.connect(self.createNewLeague)
openLeagueAction = QAction('Open Existing League', self)
openLeagueAction.setShortcut('Ctrl+E')
openLeagueAction.setStatusTip('Continue with a previously started league')
openLeagueAction.triggered.connect(self.openExistingLeague)
exitAction = QAction('Quit', self)
exitAction.setShortcut('Ctrl+Q')
exitAction.setStatusTip('Quit the application...')
exitAction.triggered.connect(self.close)
self.statusBar()
mainMenu = self.menuBar()
fileMenu = mainMenu.addMenu('&File')
fileMenu.addAction(newLeagueAction)
fileMenu.addAction(openLeagueAction)
fileMenu.addAction(exitAction)
self.resize(1920, 1080)
self.setWindowTitle("Brackets")
def createNewLeague(self):
'''shows dialog to create a new league'''
self.newLeague = CreateLeague()
self.newLeague.show()
print('New League being created...')
def openExistingLeague(self):
print('Existing League opening...')
def main():
app = QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())
if __name__ == '__main__':
main()
Here is the second window:
from PyQt5.QtWidgets import QMainWindow
class CreateLeague(QMainWindow):
def __init__(self):
super(CreateLeague, self).__init__()
self.initUI()
def initUI(self):
self.setGeometry(600, 500)
self.setWindowTitle('Create A New League')
I've looked at other examples such as this, and this, and I'm not seeing what it is I'm doing different. I've experimented with using parent as an argument in the constructors and the result is no different.
Your Main Window code is ok, but you should remove CreateLeague, self arguments from the super parameters in your second window, then, your code should work fine.
See below:
from PyQt5.QtWidgets import QMainWindow
class CreateLeague(QMainWindow):
def __init__(self):
super().__init__()
self.initUI()
def initUI(self):
self.resize(600, 500)
self.setWindowTitle('Create A New League')
I'm trying to make an application but I keep getting punched by the "simple" things like this one, how do I open a new window though a button click? I tried using new_lib_btn.clicked.connect(newlib), newlib is the file that contains my second window and new_lib_btn is the button that should open the window, it's in my main window as you can see down here:
mainwindow.py
from PyQt4 import QtCore, QtGui
import newlib
import sys
# Main Window
class Window (QtGui.QMainWindow):
def __init__(self):
super(Window, self).__init__()
centralwidget = QtGui.QWidget(self)
self.mainLayout = QtGui.QVBoxLayout(centralwidget)
self.mainLayout.setAlignment(QtCore.Qt.AlignCenter)
self.setCentralWidget(centralwidget)
self.resize(800, 600)
self.setWindowTitle("Virtual Library")
self.setStyleSheet("Window {border-image: url(lib.jpg);}")
# ExitOption
menu_action1 = QtGui.QAction("Exit", self)
menu_action1.setShortcut("Ctrl+Q")
menu_action1.setStatusTip('Exit The App')
menu_action1.triggered.connect(self.close_application)
self.statusBar()
# MenuBar
main_menu = self.menuBar()
file_menu = main_menu.addMenu('Options')
file_menu.addAction(menu_action1)
self.home()
def home(self):
# NewLibrary btn
new_lib_btn = QtGui.QPushButton("New Library", self)
new_lib_btn.setGeometry(QtCore.QRect(310, 180, 141, 41))
new_lib_btn.setStyleSheet("color: black;")
# AccessLibrary btn
access_lib_btn = QtGui.QPushButton("Access Library", self)
access_lib_btn.setGeometry(QtCore.QRect(310, 250, 141, 41))
access_lib_btn.setStyleSheet("color: black;")
# FindNewBooks btn
find_nbooks = QtGui.QPushButton("Find New Books*", self)
find_nbooks.setGeometry(QtCore.QRect(310, 320, 141, 41))
find_nbooks.setStyleSheet("color: black;")
self.mainLayout.addWidget(new_lib_btn)
self.mainLayout.addWidget(access_lib_btn)
self.mainLayout.addWidget(find_nbooks_btn)
self.show()
def close_application(self):
choice = QtGui.QMessageBox.question(self, 'Exit',
"Close the application?",
QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
if choice == QtGui.QMessageBox.Yes:
sys.exit()
else:
pass
def run():
app = QtGui.QApplication(sys.argv)
GUI = Window()
sys.exit(app.exec_())
run()
And here's my second window, the one I want to open with the new_lib_btn
newlib.py
class NewLibrary (QtGui.QMainWindow):
def __init__(self):
super(NewLibrary, self).__init__()
self.resize(800,600)
self.setWindowTitle("New Library")
self.setStyleSheet("NewLibrary {border-image: url(wood.jpg);}")
# File Options
file_action1 = QtGui.QAction("New Library", self)
file_action1.setShortcut("Ctrl+N")
file_action1.setStatusTip("Creates a new library")
file_action2 = QtGui.QAction("Exit this!", self)
file_action2.setShortcut("Ctrl+Q")
file_action2.setStatusTip("Closes The App")
file_action2.triggered.connect(self.close_application)
#File Menu
main_menu = self.menuBar()
file_menu = main_menu.addMenu("File")
file_menu.addAction(file_action1)
file_menu.addAction(file_action2)
self.newLib()
self.newLib()
def newLib(self):
centralwidget = QtGui.QWidget(self)
self.mainLayout = QtGui.QVBoxLayout(centralwidget)
self.mainLayout.setAlignment(QtCore.Qt.AlignCenter)
#some useful buttons in the future
self.setCentralWidget(centralwidget)
self.show()
def close_application(self):
choice = QtGui.QMessageBox.question(self, 'Exit',
"Close the application?",
QtGui.QMessageBox.Yes | QtGui.QMessageBox.No)
if choice == QtGui.QMessageBox.Yes:
sys.exit()
else:
pass
def runNewLib():
app = QtGui.QApplication(sys.argv)
gui = NewLibrary()
sys.exit(app.exec_())
runNewLib()
I searched a lot about this but I couldn't understand the few ones that were somewhat close to my situation, so I'm asking for help, It seems so simple but I'm not getting it :/, what should I do to open the second window by clicking new_lib_btn? pls help.
I think there are several issues with the code that you've posted. First, there are two calls to self.newLib() in the NewLibrary constructor. Second, you probably want to put that call to runNewLib() at the bottom of newlib.py behind an if __name__... block, like so:
if __name__ == '__main__':
runNewLib()
Otherwise, every time you try to import newlib.py, it will attempt to run NewLibrary as a separate application.
Getting to the question you asked, I don't think you actually want to call self.show() in either Window.home() or NewLibrary.newLib(). A more typical pattern would be to create an instance of either Window or NewLibrary and then call show() on that instance. So, in your Window class, you'd add a function to create an instance of NewLibrary and then call show on it, like this
def create_new_library_window(self):
self.new_lib = newlib.NewLibrary()
self.new_lib.show()
Note that, as ekhumoro points out, you have to keep a reference to new_lib around, otherwise it will get garbage collected when the function exits. Then in NewLibrary.home() after you've created the new_lib_btn connect it to this new function:
new_lib_btn.clicked.connect(self.create_new_library_window)
Working example
This example creates a main window with one big button that, when clicked will open a second window. It uses two classes that inherit from QMainWindow, as in your question. First, in main.py:
from PyQt4 import QtGui
from new_window import NewWindow
class Window(QtGui.QMainWindow):
def __init__(self):
super(Window, self).__init__()
self._new_window = None
self._button = QtGui.QPushButton('New Window', self)
self._button.clicked.connect(self.create_new_window)
self.setCentralWidget(self._button)
def create_new_window(self):
self._new_window = NewWindow()
self._new_window.show()
if __name__ == '__main__':
app = QtGui.QApplication([])
gui = Window()
gui.show()
app.exec_()
The __init__ function creates a button and connects it to the create_new_window function. When the button is clicked, create_new_window will be called. Inside of create_new_window, we create an instance of NewWindow and assign it to a class member to maintain a reference to the window and prevent it from being garbage collected. We then call show on this new window to display it.
At the bottom, we use the usual if __name__ == '__main__': pattern to control whether this file runs the application or not. If this file is executed from the command line (like python main.py) __name__ == '__main__' evaluates to true and the GUI application will be started. This has the advantage of allowing the file to serve a dual purpose: it can be imported as a standard python package, or executed as an application, all using the same file.
Then in new_window.py:
from PyQt4 import QtGui
class NewWindow(QtGui.QMainWindow):
def __init__(self):
super(NewWindow, self).__init__()
self._new_window = None
self._label = QtGui.QLabel('Hello, is it me you\'re looking for?')
self.setCentralWidget(self._label)
if __name__ == '__main__':
app = QtGui.QApplication([])
gui = NewWindow()
gui.show()
app.exec_()
This file defines a second QMainWindow that uses a label as its central widget. It also uses the __name__ == '__main__' pattern; this file can also be executed as a standalone application or imported as in main.py above.
If main window right-clicked a QInputDialog shows up. I want QInputDialog to block main window while it is open. How to achieve this?
from PyQt4 import QtCore, QtGui
app = QtGui.QApplication([])
class AppWindow(QtGui.QMainWindow):
def __init__(self):
super(AppWindow, self).__init__()
mainWidget=QtGui.QWidget()
self.setCentralWidget(mainWidget)
mainLayout = QtGui.QVBoxLayout()
mainWidget.setLayout(mainLayout)
frame=QtGui.QFrame()
frame.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
frame.connect(frame, QtCore.SIGNAL("customContextMenuRequested(QPoint)" ), self.up)
mainLayout.addWidget(frame)
self.modal=QtGui.QInputDialog()
def up(self, QPos):
self.modal.move(QtGui.QCursor.pos())
self.modal.show()
self.modal.raise_()
window=AppWindow()
window.show()
sys.exit(app.exec_())
OK, This solution can be solve by use method QWidget.setWindowModality (self, Qt.WindowModality windowModality) . A modal window is one that blocks input to other windows. Note that windows that are children of a modal window are not blocked.
Add this line in your initial method;
self.modal.setWindowModality(QtCore.Qt.ApplicationModal)
Completed code is;
import sys
from PyQt4 import QtCore, QtGui
class AppWindow (QtGui.QMainWindow):
def __init__ (self):
super(AppWindow, self).__init__()
mainWidget = QtGui.QWidget(self)
self.setCentralWidget(mainWidget)
mainLayout = QtGui.QVBoxLayout()
mainWidget.setLayout(mainLayout)
frame = QtGui.QFrame()
frame.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)
frame.connect(frame, QtCore.SIGNAL("customContextMenuRequested(QPoint)" ), self.up)
mainLayout.addWidget(frame)
self.modal = QtGui.QInputDialog(self)
self.modal.setWindowModality(QtCore.Qt.ApplicationModal)
def up (self, QPos):
self.modal.move(QtGui.QCursor.pos())
self.modal.show()
self.modal.raise_()
app = QtGui.QApplication([])
window = AppWindow()
window.show()
sys.exit(app.exec_())
Reference method : http://pyqt.sourceforge.net/Docs/PyQt4/qwidget.html#setWindowModality
Reference enum : http://pyqt.sourceforge.net/Docs/PyQt4/qt.html#WindowModality-enum
Regards,
In a nut shell, this is the basic approach. I have created a second window (a Frame), containing a table widget, and the name of my class is TableWindow. Import that in your main window file. On a button click, I call the below function.
def call_table_window(self):
self.frame = QtGui.QFrame()
self.window_table = TableWindow()
self.window_table.setupUi(self.frame)
#This stops the user to switch to the main window. He has to close
#the 2nd window first.
self.frame.setWindowModality(QtCore.Qt.ApplicationModal)
self.frame.show()
Especially when working with PyQt5, you can set inside the __init__
self.setWindowModality(QtCore.Qt.ApplicationModal)
I am trying to call another window from a button click in python 2.7 using PyQt4. The code below opens the AddBooking dialog but immediately closes it. Im new to Gui programming, can somebody please tell me what is wrong with my code?
from PyQt4 import QtGui
from HomeScreen import Ui_HomeScreen
from AddBooking import Ui_AddBooking
import sys
class HomeScreen(QtGui.QWidget, Ui_HomeScreen):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
self.show()
self.Add_Booking_Button.clicked.connect(self.handleButton)
def handleButton(self):
AddBooking2()
class AddBooking2(QtGui.QWidget, Ui_AddBooking):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.setupUi(self)
self.show()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = HomeScreen()
window.show()
sys.exit(app.exec_())
Don't use multi-inheritance and neither call show function inside class initializer. The problem is that the object you are creating with AddBooking2() is a temporal and it's destroyed automatically when the function ends. So you need use some variable to reference that object something like:
addbooking = AddBooking2()
addbooking.show()
Also, since you are working with QtDesigner and pyuic4 tools you can make connections a little bit easier. Said that, your code can be modified:
from PyQt4 import QtGui
from PyQt4.QtCore import pyqtSlot
from HomeScreen import Ui_HomeScreen
from AddBooking import Ui_AddBooking
import sys
class HomeScreen(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_HomeScreen()
self.ui.setupUi(self)
#pyqtSlot("")
def on_Add_Booking_Button_clicked(self): # The connection is carried by the Ui_* classes generated by pyuic4
addbooking = AddBooking2()
addbooking.show()
class AddBooking2(QtGui.QWidget):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_AddBooking()
self.ui.setupUi(self)
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
window = HomeScreen()
window.show()
sys.exit(app.exec_())
The dialog closes immediately because you are not keeping a reference to it, and so it will get garbage-collected as soon as it goes out of scope.
The simplest way to fix it would be to do something like this:
def handleButton(self):
self.dialog = AddBooking2()
self.dialog.show()
and you can also remove the self.show() lines from AddBooking2.__init__ and HomeScreen.__init__, which are redundant. Other than that, your code looks fine.