从不同文件中的其他类更改标签 [英] change label from other class in a different file

问题描述

我正在创建一个应用程序，其中有一个带有标签的主窗口，然后是另一个文件中的停靠小部件.我想从停靠小部件上的按钮更改主窗口标签.我尝试导入主窗口文件，但无法访问标签.而且我还尝试在主窗口中调用一个函数来更改标签，但标签不会改变.代码如下:

I am creating an application where I have a main window whit a label and then a docked widget that is in another file. I want to change the main windows label from a button at the docked widget. I try to import the main window file but then I can not access to the label. And I also tried to call a function in the main windows that changes the label but then the label does not change. Here is the code:

main_window.py:

main_window.py:

import results_window

class MainWindow(QMainWindow):

    def __init__(self):
        super(MainWindow, self).__init__()

        self.define_main_windows()

        self.create_dock_widgets()

    def define_main_windows(self):
        # Define de Main window properties
        self.setMinimumSize(QSize(300, 100))    
        self.setWindowTitle("Python SkyLibris") 
        self.setWindowIcon(QtGui.QIcon("skylibris_icon.png"))
        self.setStyleSheet("QMainWindow {background: 'white';}")

        self.top = 50
        self.left = 0
        self.width = 1300
        self.height = 400
        self.setGeometry(self.left, self.top, self.width, self.height)

        self.result = QLabel("result:")
        self.setCentralWidget(self.result)


    def create_dock_widgets(self):
        # Create dock widgets
        self.results_window = results_window.results_window()
        self.resultsWindowDock = QDockWidget("Results Viewer", self)
        self.resultsWindowDock.setWidget(self.results_window )
        self.resultsWindowDock.setFloating(False)
        self.resultsWindowDock.setVisible(True)
        self.addDockWidget(Qt.LeftDockWidgetArea, self.resultsWindowDock)

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    app.setStyle('Fusion')
    mainWin = MainWindow()
    mainWin.show()
    sys.exit(app.exec_())

results_window.py:

results_window.py:

import main_window

class results_window(QWidget):

    def __init__(self):
        super(results_window, self).__init__()
        print("init")

        self.label = QLabel()
        self.value = QLineEdit()

        self.bt = QPushButton("Click")
        self.bt.clicked.connect(self.clickMethod)


        self.main_layout = QVBoxLayout()
        self.main_layout.addWidget(self.label)
        self.main_layout.addWidget(self.value)
        self.main_layout.addWidget(self.bt)

        self.setLayout(self.main_layout)

    def clickMethod(self):
        print(self.value.text())
        text = self.value.text()
        main_window.result.setText(text)

推荐答案

你使用了错误的工具，例如你的代码有一个循环导入导致你的应用程序关闭，因为它相当于一个 while True.

You are using the wrong tools, for example your code has a circular import that causes your application to close since it is equivalent to a while True.

在 Qt 中，信号和槽用于异步共享数据，并有助于实现类之间不存在耦合的事实.在您的情况下，Results_Window 必须具有将该信息传输到 MainWindow 的信号，该信号必须在 clickMethod 内发出.

In Qt, signals and slots are used to share data asynchronously, as well as contributing to the fact that there is no coupling between classes. In your case, Results_Window must have a signal that transmits that information to the MainWindow, this signal must be emit within clickMethod.

results_window.py

from PyQt5 import QtCore, QtWidgets

class Results_Window(QtWidgets.QWidget):
    resultChanged = QtCore.pyqtSignal(str)

    def __init__(self):
        super(Results_Window, self).__init__()
        print("init")

        self.label = QtWidgets.QLabel()
        self.value = QtWidgets.QLineEdit()

        self.bt = QtWidgets.QPushButton("Click")
        self.bt.clicked.connect(self.clickMethod)

        main_layout = QtWidgets.QVBoxLayout(self)
        main_layout.addWidget(self.label)
        main_layout.addWidget(self.value)
        main_layout.addWidget(self.bt)

    @QtCore.pyqtSlot()
    def clickMethod(self):
        text = self.value.text()
        self.resultChanged.emit(text)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    app.setStyle('Fusion')
    w = Results_Window()
    w.show()
    sys.exit(app.exec_())

ma​​in_window.py

from PyQt5 import QtCore, QtGui, QtWidgets
import results_window

class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
        self.define_main_windows()
        self.create_dock_widgets()

    def define_main_windows(self):
        self.setMinimumSize(QtCore.QSize(300, 100))    
        self.setWindowTitle("Python SkyLibris") 
        self.setWindowIcon(QtGui.QIcon("skylibris_icon.png"))
        self.setStyleSheet("QMainWindow {background: 'white';}")
        top, left, width, height = 50, 0, 1300, 400
        self.setGeometry(left, top, width, height)
        self.result = QtWidgets.QLabel("result:")
        self.setCentralWidget(self.result)

    def create_dock_widgets(self):
        self.results_window = results_window.Results_Window()
        self.results_window.resultChanged.connect(self.result.setText)
        self.resultsWindowDock = QtWidgets.QDockWidget("Results Viewer", self)
        self.resultsWindowDock.setWidget(self.results_window )
        self.resultsWindowDock.setFloating(False)
        self.resultsWindowDock.setVisible(True)
        self.addDockWidget(QtCore.Qt.LeftDockWidgetArea, self.resultsWindowDock)

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    app.setStyle('Fusion')
    mainWin = MainWindow()
    mainWin.show()
    sys.exit(app.exec_())

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