问题描述
我试图通过 PyQt5 通过热键(例如"F1")显示QMenu实例,然后我发现了此包键盘.
I was trying to show a QMenu instance by an hotkey(e.g. "F1") by PyQt5, then I found this package keyboard.
尝试像这样使用它: keyboard.add_hotkey('F1',self.show_menu,prevent = True)
然后我得到了这些代码:
Then I got these code:
import sys
import keyboard
from PyQt5.QtCore import Qt
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__(flags=Qt.WindowStaysOnTopHint)
self.menu = QMenu('Menu')
self.menu.addAction(QAction('menu1', self.menu))
self.menu.addAction(QAction('menu2', self.menu))
self.menu.addAction(QAction('menu3', self.menu))
self.show_menu() # this works well
keyboard.add_hotkey('F1', self.show_menu, suppress=True) # this hotkey works but not showing the menu
def show_menu(self):
print('111')
self.menu.popup(QCursor().pos())
print('222')
if __name__ == '__main__':
app = QApplication(sys.argv)
app.setQuitOnLastWindowClosed(False)
win = MainWindow()
# win.show()
sys.exit(app.exec_())
实际上,在 __ init __
中对方法 self.show_menu
的调用工作良好,可以按预期弹出菜单.
Actually, the calling to method self.show_menu
in __init__
works well, a menu can popup as expected.
但是问题是,当我按下热键"F1"时,将打印"111"和"222",但菜单不会出现.
But the QUESTION is that, when I press the hotkey "F1", "111" and "222" would be printed, but the menu, won't appear.
有什么问题吗,或者我可以通过其他方式做到这一点?请告诉我,谢谢.
Is there anything wrong, or I can make it in some other ways? Please tell me, thank you.
推荐答案
与add_hotkey关联的回调在辅助线程中执行,并且在OP代码中,该回调是show_menu方法,该方法修改了Qt禁止的GUI.解决方案是使用信号:
The callback associated with add_hotkey is executed in a secondary thread, and in the OP code the callback is the show_menu method that modifies the GUI which is prohibited by Qt. The solution is to use signals:
import sys
import keyboard
from PyQt5.QtCore import Qt, QObject, pyqtSignal
from PyQt5.QtGui import QCursor
from PyQt5.QtWidgets import QAction, QApplication, QMainWindow, QMenu
class KeyBoardManager(QObject):
F1Signal = pyqtSignal()
def start(self):
keyboard.add_hotkey("F1", self.F1Signal.emit, suppress=True)
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__(flags=Qt.WindowStaysOnTopHint)
self.menu = QMenu("Menu")
self.menu.addAction(QAction("menu1", self.menu))
self.menu.addAction(QAction("menu2", self.menu))
self.menu.addAction(QAction("menu3", self.menu))
manager = KeyBoardManager(self)
manager.F1Signal.connect(self.show_menu)
manager.start()
def show_menu(self):
print("111")
self.menu.popup(QCursor.pos())
print("222")
if __name__ == "__main__":
app = QApplication(sys.argv)
app.setQuitOnLastWindowClosed(False)
win = MainWindow()
# win.show()
sys.exit(app.exec_())
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