我的自定义窗口小部件在其他会话上对我的paintEvent没有反应

如何解决我的自定义窗口小部件在其他会话上对我的paintEvent没有反应

我正在尝试开发一个包含许多自定义小部件的程序。在我的窗口小部件中，我有一个十字准线鼠标指针，当我在其中一个窗口小部件中移动它时，所有这些元素都必须感知到它，并且十字准线必须对每个单个窗口小部件做出反应。在paintEnent函数的末尾有一个self.update（）。

如何强制应用程序上的其他小部件做出反应？

paintEvent不是像这样的简单代码，因为我在此部分添加了每个函数，所以它占用了很高的cpu使用率。我该如何管理？

 import sys
 from PyQt5.QtWidgets import QApplication,QDialog,QListWidget,QComboBox,QVBoxLayout,QPushButton,QLabel,QMainWindow,QWidget,QHBoxLayout,QSizePolicy
 from PyQt5.QtCore import Qt,QSize,QRect
 from PyQt5.QtGui import QPalette,QColor,QPen,Qpixmap,QPainter,QBrush



 class Boom(QWidget):
     xPos=-1.0
     def __init__(self,bgColor,xSpace=1,ySpace=1):
         super().__init__()
         self.bgColor=bgColor       
         self.x = -1
         self.y = -1
     self.setSizePolicy(QSizePolicy.MinimumExpanding,QSizePolicy.MinimumExpanding)
     self.setMouseTracking(True)
     layout = QVBoxLayout()
     self.setLayout(layout)

 def mouseMoveEvent(self,event):
     global xPos
     self.x = event.x()
     self.y = event.y()
     xPos=self.x/self.width()
     self.update()


 def paintEvent(self,e):
     painter = QPainter(self)

     font = painter.font()
     font.setFamily('Times')
     font.setPointSize(8)
     painter.setFont(font)

     brush = QBrush()
     brush.setColor(QColor(self.bgColor))
     brush.setStyle(Qt.solidPattern)

     pen = QPen()
     pen.setWidth(1)
     pen.setColor(QColor('black'))
     painter.setPen(pen)

     rect = QRect(0,painter.device().width(),painter.device().height())
     painter.fillRect(rect,brush)

     pen.setColor(QColor('blue'))
     painter.setPen(pen) 

     painter.drawLine(self.x,self.x,painter.device().height()) #V
     painter.drawLine(0,self.y,self.y) #H

     self.update()

     painter.end()


 class MainWindow(QMainWindow):
 def __init__(self):
     super(MainWindow,self).__init__()

     self.setwindowTitle("Graph")

     MainPanelLayout = QHBoxLayout()

     MainPanelLayout.setContentsMargins(1,1,1)
     MainPanelLayout.setSpacing(1)
     B1=Boom('pink',0)
     B2=Boom('gray',1)
     MainPanelLayout.addWidget(B1)
     MainPanelLayout.addWidget(B2)

     widget = QWidget()
     widget.setLayout(MainPanelLayout)
     self.setCentralWidget(widget)

 if __name__ == "__main__":
 app = QApplication(sys.argv)
 mainWindow = MainWindow()
 mainWindow.show()
 # mainWindow.showMaximized()
 app.exec_()

解决方法

IV找到了方法！我使用信号和插槽在实例之间进行通信

也可能对其他人有用：）

import sys
from PyQt5.QtWidgets import QApplication,QDialog,QListWidget,QComboBox,QVBoxLayout,QPushButton,QLabel,QMainWindow,QWidget,QHBoxLayout,QSizePolicy
from PyQt5.QtCore import Qt,QSize,QRect,QObject,pyqtSignal
from PyQt5.QtGui import QPalette,QColor,QPen,QPixmap,QPainter,QBrush
import FxMainForm

class BoomCommunicate(QObject):
 signal = pyqtSignal()

class Boom(QWidget):
 xPos=-1
 def __init__(self,bgColor,nChannel=-1,xSpace=1,ySpace=1):
    super().__init__()
    self.bgColor=bgColor
    self.xSpace=xSpace
    self.ySpace=ySpace        
    self.x = -1
    self.y = -1
    self.nChannel=nChannel
    self.setSizePolicy(QSizePolicy.MinimumExpanding,QSizePolicy.MinimumExpanding)
    self.setMouseTracking(True)
    self.layout = QVBoxLayout()
    self.setLayout(self.layout)
    self.communicate = BoomCommunicate()
    self.communicate.signal.connect(self.trigger_refresh)

def mouseMoveEvent(self,event):
    self.x = event.x()
    self.y = event.y()
    if self.nChannel==0:
        Boom.xPos=self.x/self.width()
    self.communicate.signal.emit()


def paintEvent(self,e):
    painter = QPainter(self)
    font = painter.font()
    font.setFamily('Times')
    font.setPointSize(8)
    painter.setFont(font)

    brush = QBrush()
    brush.setColor(QColor(self.bgColor))
    brush.setStyle(Qt.SolidPattern)

    pen = QPen()
    pen.setWidth(1)
    pen.setColor(QColor('black'))
    painter.setPen(pen)

    ## Border
    rect = QRect(0,painter.device().width(),painter.device().height())
    painter.fillRect(rect,brush)

    pen.setColor(QColor('blue'))
    painter.setPen(pen)  

    # self.Drawings(painter,pen,brush)

    if self.nChannel==0:
        painter.setPen(QPen(Qt.red,1,Qt.SolidLine))  
        painter.drawLine(self.x,self.ySpace,self.x,painter.device().height()-self.ySpace-1) ##V
        painter.drawLine(self.xSpace,self.y,painter.device().width()-self.ySpace-1,self.y)  ##H
        if not FxMainForm.studyItem==None:
            painter.setPen(QPen(Qt.black,Qt.SolidLine))     
            painter.drawText(5,15,FxMainForm.studyItem[0]+' ('+FxMainForm.studyItem[1]+') ')
            Boom.xPos=self.x/self.width()
    else:
        painter.setPen(QPen(Qt.red,Qt.SolidLine))  
        painter.drawLine(int(Boom.xPos*painter.device().width()),int(Boom.xPos*painter.device().width()),painter.device().height()-self.ySpace-1)
    
    painter.end()

def trigger_refresh(self):
    self.update()

def sizeHint(self):
    return QSize(100,100)





class MainWindow(QMainWindow):
def __init__(self):
    super(MainWindow,self).__init__()
    self.setWindowTitle("Graph-Boom")

    self.MainPanelLayout = QHBoxLayout()

    self.MainPanelLayout.setContentsMargins(1,1)
    self.MainPanelLayout.setSpacing(1)
    self.B1=Boom('pink',0)
    self.B2=Boom('gray',1)
    self.MainPanelLayout.addWidget(self.B1)
    self.MainPanelLayout.addWidget(self.B2)
    self.B1.communicate.signal.connect(self.B2.update)    


    
    self.widget = QWidget()
    self.widget.setLayout(self.MainPanelLayout)
    self.setCentralWidget(self.widget)

if __name__ == "__main__":
 app = QApplication(sys.argv)
 mainWindow = MainWindow()
 mainWindow.show()
 # mainWindow.showMaximized()
 app.exec_()