問題描述

我正在創建一個應用程序，其中有一個帶有標簽的主窗口，然后是另一個文件中的停靠小部件.我想從停靠小部件上的按鈕更改主窗口標簽.我嘗試導入主窗口文件，但無法訪問標簽.而且我還嘗試在主窗口中調用一個函數來更改標簽，但標簽不會改變.代碼如下:

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)

推薦答案

你使用了錯誤的工具，例如你的代碼有一個循環導入導致你的應用程序關閉，因為它相當于一個 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，信號和槽用于異步共享數據，并有助于實現類之間不存在耦合的事實.在您的情況下，Results_Window 必須具有將該信息傳輸到 MainWindow 的信號，該信號必須在 clickMethod 內發出.

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_())

這篇關于從不同文件中的其他類更改標簽的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！