Sending a signal from a button to a parent window - python-3.x

Question

I'm making an app with PyQt5 that uses a FileDialog to get files from the user and saves the file names in a list. However I also want to be able to remove those entries after they are added, so I created a class that has a name(the file name) and a button. The idea is that when this button is clicked the widget disappears and the file entry is removed from the list. The disappearing part works fine but how to I get the widget to remove the entry form the list? How can i send a signal from one widget inside the window to the main app and tell it to remove the entry from the list?
I know the code is very bad, I'm still very new to PyQt and Python in general so any advice would be greatly appreciated.
from PyQt5 import QtWidgets as qw
import sys
class MainWindow(qw.QMainWindow):
def __init__(self):
super().__init__()
# List of opened files
self.files = []
# Main Window layout
self.layout = qw.QVBoxLayout()
self.file_display = qw.QStackedWidget()
self.file_button = qw.QPushButton('Add File')
self.file_button.clicked.connect(self.add_file)
self.layout.addWidget(self.file_display)
self.layout.addWidget(self.file_button)
self.setCentralWidget(qw.QWidget())
self.centralWidget().setLayout(self.layout)
# Open File Dialog and append file name to list
def add_file(self):
file_dialog = qw.QFileDialog()
self.files.append(file_dialog.getOpenFileName())
self.update_stack()
# Create new widget for StackedWidget remove the old one and display the new
def update_stack(self):
new_stack_item = qw.QWidget()
layout = qw.QVBoxLayout()
for file in self.files:
layout.addWidget(FileWidget(file[0]))
new_stack_item.setLayout(layout)
if len(self.file_display) > 0:
temp_widget = self.file_display.currentWidget()
self.file_display.removeWidget(temp_widget)
self.file_display.addWidget(new_stack_item)
class FileWidget(qw.QWidget):
def __init__(self, name):
# This widget is what is added when a new file is opened
# it has a file name and a close button
# my idea is that when the close button is pressed the widget is removed
# from the window and from the files[] list in the main class
super().__init__()
self.layout = qw.QHBoxLayout()
self.file_name = qw.QLabel(name)
self.close_button = qw.QPushButton()
self.close_button.clicked.connect(self.remove)
self.layout.addWidget(self.file_name)
self.layout.addWidget(self.close_button)
self.setLayout(self.layout)
def remove(self):
self.close()
if __name__ == '__main__':
app = qw.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())

Answer 1

You need to remove from the list in the remove method of theFileWidget class.
import sys
from PyQt5 import QtWidgets as qw
class FileWidget(qw.QWidget):
def __init__(self, name, files): # + files
super().__init__()
self.files = files # +
self.name = name # +
self.layout = qw.QHBoxLayout()
self.file_name = qw.QLabel(name)
self.close_button = qw.QPushButton("close {}".format(name))
self.close_button.clicked.connect(self.remove)
self.layout.addWidget(self.file_name)
self.layout.addWidget(self.close_button)
self.setLayout(self.layout)
def remove(self):
self.files.pop(self.files.index(self.name)) # <<<-----<
self.close()
class MainWindow(qw.QMainWindow):
def __init__(self):
super().__init__()
# List of opened files
self.files = []
# Main Window layout
self.layout = qw.QVBoxLayout()
self.file_display = qw.QStackedWidget()
self.file_button = qw.QPushButton('Add File')
self.file_button.clicked.connect(self.add_file)
self.layout.addWidget(self.file_display)
self.layout.addWidget(self.file_button)
self.setCentralWidget(qw.QWidget())
self.centralWidget().setLayout(self.layout)
# Open File Dialog and append file name to list
def add_file(self):
file_name, _ = qw.QFileDialog().getOpenFileName(self, 'Open File') # +
if file_name: # +
self.files.append(file_name) # +
self.update_stack()
# Create new widget for StackedWidget remove the old one and display the new
def update_stack(self):
new_stack_item = qw.QWidget()
layout = qw.QVBoxLayout()
for file in self.files:
layout.addWidget(FileWidget(file, self.files)) # + self.files
new_stack_item.setLayout(layout)
if len(self.file_display) > 0:
temp_widget = self.file_display.currentWidget()
self.file_display.removeWidget(temp_widget)
self.file_display.addWidget(new_stack_item)
if __name__ == '__main__':
app = qw.QApplication(sys.argv)
window = MainWindow()
window.show()
sys.exit(app.exec_())