Question

假设我在GUI界面中进行了文本编辑，并且按了一个像 a 这样的键，那么我就不应该得到一个＆＃39; a＆＃39;写在我的文字编辑上。

我可以将自己的功能添加到按键事件中，但我不能阻止它执行默认机制。

请帮帮我。

Answer 1

您可以阻止特定密钥的默认keyPressEvent行为，如下所示：

class CodeEditor(QtWidgets.QPlainTextEdit):
    def keyPressEvent(self, event):
        if event.key() == QtCore.Qt.Key_A:
            # do nothing
            event.accept()
        else:
            # do the default
            super().keyPressEvent(event)

Answer 2

您可以安装eventFilter并阻止传输密钥。

import sys

from PyQt5.QtWidgets import QApplication, QPlainTextEdit
from PyQt5.QtCore import QObject, Qt, QEvent

class Helper(QObject):
    def disable_key(self, w, key):
        self.m_w = w
        self.m_w.installEventFilter(self)

        self.m_key = key 
    def eventFilter(self, obj, event):
        if obj == self.m_w and event.type() == QEvent.KeyPress:
            if event.key() == self.m_key:
                return True
        return QObject.eventFilter(self, obj, event)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    helper = Helper()
    view = QPlainTextEdit()
    helper.disable_key(view, Qt.Key_A)
    view.show()

    sys.exit(app.exec_())

或通过信件：

import sys

from PyQt5.QtWidgets import QApplication, QPlainTextEdit
from PyQt5.QtCore import QObject, Qt, QEvent

class Helper(QObject):
    def disable_key(self, w, letter):
        self.m_w = w
        self.m_w.installEventFilter(self)

        self.m_letter = letter 
    def eventFilter(self, obj, event):
        if obj == self.m_w and event.type() == QEvent.KeyPress:
            if event.text() == self.m_letter:
                return True
        return QObject.eventFilter(self, obj, event)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    helper = Helper()
    view = QPlainTextEdit()
    helper.disable_key(view, "a")
    view.show()
    sys.exit(app.exec_())

如何防止密钥在QPlainTextEdit中运行

2 个答案: