python - 如何在pyqt(QGIS)中捕捉QDockWidget的KeyPressedEvent

Question

我正在尝试在 QDockWidget 的 KeyPressedEvent 中添加一些逻辑。它在没有 QDockWidget 的情况下工作，即在主窗口上工作，但在 QDockWidget 上不起作用。

这是我尝试过的:

from PyQt5 import QtCore
from PyQt5.QtWidgets import *
from qgis.core import QgsProject
from .progress_bar import Ui_MainWindow_Progress

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QApplication.translate(context, text, disambig)

class Ui_MainWindow(QMainWindow):

    def __init__(self, iface):
        super().__init__()
        self.iface = iface

    def setupUi(self, MainWindow):

        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(356, 750)

        self.pushButton_exit = QPushButton(MainWindow)
        self.pushButton_exit.setGeometry(QtCore.QRect(290, 0, 50, 23))
        self.pushButton_exit.setObjectName(_fromUtf8("pushButton_exit"))
        self.pushButton_exit.setStyleSheet("background-color: red")

        self.label_4 = QLabel(MainWindow)
        self.label_4.setGeometry(QtCore.QRect(20, 300, 81, 20))
        self.label_4.setObjectName(_fromUtf8("label_4"))

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        self.dock_widget = QDockWidget("My Plugin", self.iface.mainWindow())
        self.dock_widget.setWidget(MainWindow)
        self.dock_widget.setFixedWidth(356)
        self.dock_widget.setFixedHeight(750)
        self.iface.addDockWidget(QtCore.Qt.RightDockWidgetArea, 
        self.dock_widget)
        self.dock_widget.setFeatures(QDockWidget.DockWidgetFloatable |
                                QDockWidget.DockWidgetMovable)
        self.dock_widget.keyPressEvent = self.keyPressed

    def keyPressed(self, event):
        if event.key() == QtCore.Qt.Key_Escape:
            print("Escape pressed")

代码运行良好，但未调用 keyPressed 方法。QDockWidget的KeyPressedEvent如何处理？

Answer 1

keyPressEvent() : is a predefined function in PyQt framework used to define the functionalities of the key press event generated. Note that, you can’t change its function name, you can define its argument content and function body as per your requirement.

event.key() == QtCore.Qt.Key_Escape is being used under the keyPresssEvent() function. Here, key_Escape is used to mention that the key we are going to generate event is the Escape key.

尝试:

def keyPressEvent(self, event):
    if event.key() == QtCore.Qt.Key_Escape:
         print("Escape pressed")