我想在我的 gui 中更改矩形的可见性。因此，我在线程中使用了无尽的时间，但它不起作用(仅在调试模式下)。有人回答吗？
你能帮我完成我的想法或给我一个提示，让我以其他方式完成工作吗？
最后，我用魔杖检查以太网连接，并用绿色或红色矩形显示它。为了进行测试，我正在向服务器发送指定的消息，该服务器会发回答案。
我的代码：
import sys
from PyQt5 import QtWidgets, QtGui
from concurrent import futures
from time import sleep
class MainApplication(QtWidgets.QWidget):
def __init__(self, parent=None):
super(MainApplication, self).__init__(parent)
# configure the main window
self.setWindowTitle('Msg Tool')
self.resize(230, 330)
# Check if ethernet is ok
self.close_connection_test = [0]
self.e = futures.ThreadPoolExecutor(max_workers=1)
self.e.submit(self.connection_test)
# RedRect
self.red_rect = RedRect(self)
self.red_rect.move(180, 12.5)
self.red_rect.setVisible(True)
# GreenRect
self.green_rect = GreenRect(self)
self.green_rect.move(180, 12.5)
self.green_rect.setVisible(False)
# Function called at the end of the application
def closeEvent(self, event):
self.close_connection_test = [1] # To stop the endless loop in the task
self.e.shutdown() # Shutdown the executer
def connection_test(self):
i = 0
while True:
i += 1
if self.close_connection_test == [1]:
break
if (i % 2) == 0:
self.red_rect.setVisible(False)
else:
self.red_rect.setVisible(True)
# self.red_rect.setVisible(False)
print('Test')
sleep(1)
class RedRect(QtWidgets.QWidget):
def __init__(self, parent=None):
super(RedRect, self).__init__(parent)
self.pen = QtGui.QPen(QtGui.QColor(0, 0, 0))
self.pen.setWidth(1)
self.brush = QtGui.QBrush(QtGui.QColor(255, 48, 48))
def paintEvent(self, event):
painter = QtGui.QPainter(self)
painter.setPen(self.pen)
painter.setBrush(self.brush)
painter.drawRect(0, 0, 15, 15)
class GreenRect(QtWidgets.QWidget):
def __init__(self, parent=None):
super(GreenRect, self).__init__(parent)
self.pen = QtGui.QPen(QtGui.QColor(0, 0, 0))
self.pen.setWidth(1)
self.brush = QtGui.QBrush(QtGui.QColor(124, 252, 0))
def paintEvent(self, event):
painter = QtGui.QPainter(self)
painter.setPen(self.pen)
painter.setBrush(self.brush)
painter.drawRect(0, 0, 15, 15)
Application = QtWidgets.QApplication(sys.argv)
Application.setStyle('Fusion')
inst_MainApplication = MainApplication()
inst_MainApplication.show()
sys.exit(Application.exec_())
首先，您必须在创建self.red_rect后使用提交，因为如果您不会看到指出该属性不存在的错误。
class MainApplication(QtWidgets.QWidget):
def __init__(self, parent=None):
super(MainApplication, self).__init__(parent)
# configure the main window
self.setWindowTitle('Msg Tool')
self.resize(230, 330)
# RedRect
self.red_rect = RedRect(self)
self.red_rect.move(180, 12.5)
self.red_rect.setVisible(True)
# GreenRect
self.green_rect = GreenRect(self)
self.green_rect.move(180, 12.5)
self.green_rect.setVisible(False)
# Check if ethernet is ok
self.close_connection_test = [0]
self.e = futures.ThreadPoolExecutor(max_workers=1)
self.e.submit(self.connection_test)
另一方面，问题是你不应该直接从另一个更新GUI，而应该通过pyqtSignal，QMetaObject::invokedMethod()，QEvent，或者使用QTimer::singleShot()与functools.partial()的最简单方法
1. QTimer
# ...
from functools import partial
from PyQt5 import QtCore, QtGui, QtWidgets
# ...
class MainApplication(QtWidgets.QWidget):
# ...
def connection_test(self):
i = 0
while True:
i += 1
if self.close_connection_test == [1]:
break
isVisible = i % 2 != 0
wrapper = partial(self.red_rect.setVisible, isVisible)
QtCore.QTimer.singleShot(0, wrapper)
print('Test')
sleep(1)
2. pyqt信号
class MainApplication(QtWidgets.QWidget):
visibilityChanged = QtCore.pyqtSignal(bool)
def __init__(self, parent=None):
# ...
# RedRect
self.red_rect = RedRect(self)
self.red_rect.move(180, 12.5)
self.red_rect.setVisible(True)
self.visibilityChanged.connect(self.red_rect.setVisible)
# ...
def connection_test(self):
i = 0
while True:
i += 1
if self.close_connection_test == [1]:
break
isVisible = i % 2 != 0
self.visibilityChanged.emit(isVisible)
print('Test')
sleep(1)
# ...
3. QMetaObject：：invokedMethod
# ...
def connection_test(self):
i = 0
while True:
i += 1
if self.close_connection_test == [1]:
break
isVisible = i % 2 != 0
QtCore.QMetaObject.invokeMethod(
self.red_rect,
"setVisible",
QtCore.Qt.QueuedConnection,
QtCore.Q_ARG(bool, isVisible),
)
print("Test")
sleep(1)
# ...
4. QEvent
class CustomEvent(QtCore.QEvent):
_type = QtCore.QEvent.User
def __init__(self, visibility):
super(CustomEvent, self).__init__(CustomEvent._type)
self._visibility = visibility
@property
def visibility(self):
return self._visibility
class MainApplication(QtWidgets.QWidget):
# ...
def connection_test(self):
i = 0
while True:
i += 1
if self.close_connection_test == [1]:
break
isVisible = i % 2 != 0
event = CustomEvent(isVisible)
QtCore.QCoreApplication.postEvent(self, event)
print("Test")
sleep(1)
def event(self, e):
if e.type() == CustomEvent._type:
self.red_rect.setVisible(e.visibility)
return True
return super(MainApplication, self).event(e)