Question

我不确定为什么以下最小代码打印鼠标但不打印键盘事件。据我所知，这两种方法都在我的自定义小部件中正确重载（位于主窗口内）。有什么想法吗？

from sys import argv, exit
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget


class MainWindow(QMainWindow):

    def __init__(self, parent=None):

        super(MainWindow, self).__init__(parent)
        self.setCentralWidget(CustomWidget(self))
        self.show()


class CustomWidget(QWidget):

    def __init__(self, parent=None):
        super(CustomWidget, self).__init__(parent)
        pass

    def mousePressEvent(self, event):
        print(event)

    def keyPressEvent(self, event):
        print(event)


if __name__ == '__main__':

    app = QApplication(argv)
    ex = MainWindow()
    exit(app.exec_())

Answer 1

经过一番谷歌搜索后，我在Qt docs中找到了这个：

如果小部件处理键盘事件，则必须为小部件启用键盘焦点。这通常是从小部件的构造函数完成的。例如，QLineEdit构造函数调用setFocusPolicy（Qt :: StrongFocus）。

因此，使用行self.setFocusPolicy(Qt.StrongFocus)添加焦点策略可以解决问题。

完整的更正代码如下：

from sys import argv, exit
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget


class MainWindow(QMainWindow):

    def __init__(self, parent=None):

        super(MainWindow, self).__init__(parent)
        self.setCentralWidget(CustomWidget(self))
        self.show()


class CustomWidget(QWidget):

    def __init__(self, parent=None):
        super(CustomWidget, self).__init__(parent)
        self.setFocusPolicy(Qt.StrongFocus)
        pass

    def mousePressEvent(self, event):
        print(event)

    def keyPressEvent(self, event):
        print(event)


if __name__ == '__main__':

    app = QApplication(argv)
    ex = MainWindow()
    exit(app.exec_())

PyQt5处理MousePressEvent但不处理KeyPressEvent

1 个答案: