我正在嘗試使用模塊“鍵盤”跟蹤我的按鍵，而 PySide2 小部件未處于焦點狀態，效果很好。但是，當我嘗試使用“鍵盤”快捷方式創建新的 Widget 時，程序崩潰了。按下按鈕打開一個窗口工作正常。我也可以使用“鍵盤”調用非 UI 函數，例如。打印功能沒有任何問題。你知道解決這個問題的方法嗎？使用“鍵盤”或任何其他方法打開一個新窗口，而 PySide2 窗口不在焦點上。在這個例子中，我想在“CTRL+D”上打開一個新窗口。PySide2 和 PyQt5 都存在該問題。這是我的縮短代碼：import sysimport jsonimport osimport keyboardfrom PySide2.QtWidgets import QApplication, QWidget, QGridLayout, QKeySequenceEdit, QLabel, QPushButton, QShortcutfrom PySide2.QtCore import Qt, QObject, Signal, Slot # Qt.Key_W beispielsweise#from PyQt5.QtWidgets import QApplication, QWidget, QGridLayout, QKeySequenceEdit, QLabel, QPushButton, QShortcut#from PyQt5.QtCore import Qt, QObject, pyqtSignal as Signal, pyqtSlot as Slot # Qt.Key_W beispielsweiseclass ConfigWindow(QWidget): def __init__(self): super().__init__() self.initUi() self.init_shortcuts() self.show() def initUi(self): self.setGeometry(300,300, 400, 250) self.setWindowTitle("Settings") grid = QGridLayout() self.setLayout(grid) self.keyseq = QKeySequenceEdit("CTRL+D") grid.addWidget(self.keyseq, 0, 0) s_button = QPushButton("Safe") grid.addWidget(s_button, 1, 0) cl_button = QPushButton("Close") grid.addWidget(cl_button, 1, 1) cl_button.clicked.connect(self.close) open_button = QPushButton("openw") grid.addWidget(open_button, 2, 0) open_button.clicked.connect(self.call_item_parser) def keyPressEvent(self, event): #event:PySide2.QtGui.QKeyEvent if event.key() == Qt.Key_Escape: self.close()
1 回答
藍山帝景
TA貢獻1843條經驗 獲得超7個贊
問題是因為在鍵盤上注冊的回調是在輔助線程中執行的，可以通過修改以下部分代碼并打印來驗證threading.current_thread()。在 Qt 中，禁止在另一個線程中創建任何小部件，因為它們不是線程安全的。
def call_item_parser(self):
print(threading.current_thread())
self.h_w = ParseWindow()
self.h_w.setWindowTitle("New Window")
self.h_w.setGeometry(100, 100, 100, 100)
self.h_w.show()
print(threading.current_thread())
app = QApplication(sys.argv)
w = ConfigWindow()
sys.exit(app.exec_())
輸出：
<_MainThread(MainThread, started 140144979916608)>
Binding _price_keyseq to ctrl+a
<Thread(Thread-10, started daemon 140144220817152)>
一種可能的解決方案是使用信號將信息發送到主線程，并在主線程中調用回調。
import sys
from functools import partial
import platform
import threading
import keyboard
from PySide2.QtCore import Qt, QObject, Signal, Slot
from PySide2.QtGui import QKeySequence
from PySide2.QtWidgets import (
QApplication,
QWidget,
QGridLayout,
QKeySequenceEdit,
QPushButton,
)
class KeyBoardManager(QObject):
activated = Signal(str)
def __init__(self, parent=None):
super().__init__(parent)
self._callbacks = dict()
self.activated.connect(self._handle_activated)
@property
def callbacks(self):
return self._callbacks
def register(self, shortcut, callback, *, args=(), kwargs=None):
self.callbacks[shortcut] = (callback, args, kwargs or {})
keyboard.add_hotkey(shortcut, partial(self.activated.emit, shortcut))
@Slot(str)
def _handle_activated(self, shortcut):
values = self.callbacks.get(shortcut)
if values is not None:
callback, args, kwargs = self._callbacks[shortcut]
callback(*args, **kwargs)
class ConfigWindow(QWidget):
def __init__(self):
super().__init__()
self.initUi()
self.init_shortcuts()
self.show()
def initUi(self):
self.setGeometry(300, 300, 400, 250)
self.setWindowTitle("Settings")
grid = QGridLayout(self)
self.keyseq = QKeySequenceEdit("CTRL+A")
grid.addWidget(self.keyseq, 0, 0)
s_button = QPushButton("Safe")
grid.addWidget(s_button, 1, 0)
cl_button = QPushButton("Close")
grid.addWidget(cl_button, 1, 1)
cl_button.clicked.connect(self.close)
open_button = QPushButton("openw")
grid.addWidget(open_button, 2, 0)
open_button.clicked.connect(self.call_item_parser)
def keyPressEvent(self, event): # event:PySide2.QtGui.QKeyEvent
if event.key() == Qt.Key_Escape:
self.close()
# shortcuts are listened to, while program is running
def init_shortcuts(self):
self.keyboard_manager = KeyBoardManager()
str_value = self.keyseq.keySequence().toString()
if platform.system() == "Linux":
str_value = str_value.lower()
print("Binding _price_keyseq to {}".format(str_value))
self.keyboard_manager.register(str_value, self.call_item_parser)
def call_item_parser(self):
print(threading.current_thread())
self.h_w = ParseWindow()
self.h_w.setWindowTitle("New Window")
self.h_w.setGeometry(100, 100, 100, 100)
self.h_w.show()
class ParseWindow(QWidget):
pass
def main():
print(threading.current_thread())
app = QApplication(sys.argv)
w = ConfigWindow()
sys.exit(app.exec_())
if __name__ == "__main__":
main()
輸出：
<_MainThread(MainThread, started 140037641176896)>
Binding _price_keyseq to ctrl+a
<_MainThread(MainThread, started 140037641176896)>
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