我正在尝试使用 PyQT5 构建一个简单的 GUI,有 3 个按钮用于打开文件浏览器,还有一个按钮用于对所选文件进行处理,但我无法让我的按钮连接到执行此操作所需的功能.
I am trying to build a simple GUI using PyQT5, with 3 buttons to open file browsers and one more to run processing with the selected files, but I can't get my buttons to connect to the functions needed to carry this out.
在 Ctrl
类中,_connect_signals
函数似乎没有调用 _input_select
.谁能帮我弄清楚为什么?
In the Ctrl
class, the _connect_signals
function doesn't seem to be calling _input_select
. Can anyone help me figure out why?
import sys
# Import QApplication and the required widgets from PyQt5.QtWidgets
from PyQt5.QtWidgets import QApplication
from PyQt5.QtWidgets import QMainWindow
from PyQt5.QtWidgets import QPushButton
from PyQt5.QtWidgets import QVBoxLayout
from PyQt5.QtWidgets import QWidget
from PyQt5.QtWidgets import QFileDialog
# Create a subclass of QMainWindow to setup the calculator's GUI
class UI(QMainWindow):
"""App's View (GUI)."""
def __init__(self):
"""View initializer."""
super().__init__()
# Set some main window's properties
self.setFixedSize(300, 150)
# Set the central widget and the general layout
self.generalLayout = QVBoxLayout()
self._centralWidget = QWidget(self)
self.setCentralWidget(self._centralWidget)
self._centralWidget.setLayout(self.generalLayout)
# Create the buttons
self._create_buttons()
def _create_buttons(self):
"""Create the buttons."""
self.buttons = {}
buttons_layout = QVBoxLayout()
# Button text | position on the QVBoxLayout
buttons = {
"Select input file...": 0,
"Select config file...": 1,
"Select output file...": 2,
"Run": 3,
}
# Create the buttons and add them to the grid layout
for btnText, pos in buttons.items():
self.buttons[btnText] = QPushButton(btnText)
buttons_layout.addWidget(self.buttons[btnText], pos)
# Add buttons_layout to the general layout
self.generalLayout.addLayout(buttons_layout)
# Create a Controller class to connect the GUI and the model
class Ctrl:
"""App's Controller."""
def __init__(self, setup, view):
"""Controller initializer."""
self._view = view
self._setup = setup
# Connect signals and slots
self._connect_signals()
def _input_select(self): # Not being called
print("input selection")
options = QFileDialog.Options()
file_select, _ = QFileDialog.getOpenFileNames(
self,
'Select Input File...',
'',
'CSV Files (*.csv);;All Files (*)',
options=options
)
if file_select:
self._setup["input"] = file_select
def _connect_signals(self):
"""Connect signals and slots."""
self._view.buttons["Select input file..."].clicked.connect(self._input_select) # Not working!
# Client code
def main():
"""Main function."""
# Create an instance of `QApplication`
app = QApplication(sys.argv)
# Show the app's GUI
view = UI()
view.show()
setup = {}
# Create instance of the controller
Ctrl(setup=setup, view=view)
# Execute app's main loop
sys.exit(app.exec_())
if __name__ == "__main__":
main()
以防万一,我开始屠杀 这个示例代码来自一个真正的 Python 教程,但一定是在这个过程中破坏了它.
In case it helps, I started out by butchering this example code from a Real Python tutorial, but must have broken it along the way.
问题是您没有保留对您正在创建的 Ctrl()
实例的任何持久引用.这会导致 python 垃圾在实例创建后立即收集它.
The problem is that you are not keeping any persistent reference to the Ctrl()
instance you are creating. This results in python garbage collecting it as soon as the instance is created.
要解决这个问题,只需将它分配给一个变量:
To solve the issue, just assign it to a variable:
def main():
"""Main function."""
# Create an instance of `QApplication`
app = QApplication(sys.argv)
# Show the app's GUI
view = UI()
view.show()
setup = {}
# Create instance of the controller
ctrl = Ctrl(setup=setup, view=view)
# Execute app's main loop
sys.exit(app.exec_())
一些注意事项:
self
,但在这种情况下,它指的是 Ctrl
实例,而参数应该是 UI
实例(这将导致崩溃,因为 Qt 将获得意外的参数类型);您可以改用 self._view
,但是,如前所述,这种情况下的整个分离只会使事情变得不必要地复杂;from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget, QFileDialog)
self
, but in that case it refers to the Ctrl
instance, while the argument should be the UI
instance instead (which will result in a crash, as Qt will get an unexpected argument type); you can use self._view
instead, but, as said, the whole separation in this case just makes things unnecessarily complex;from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget, QFileDialog)
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