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python - 我的自定义小部件在其他会话上对我的paintEvent 没有反应

问题描述

我正在尝试开发一个包含许多我的自定义小部件的程序。在我的小部件中，我有一个十字准线鼠标指针，当我在其中一个小部件中移动它时，它们都必须感应到它，并且十字准线必须对每个小部件做出反应。我在 paintEnent 函数的末尾有一个 self.update() 。

  1. 如何强制我的应用程序上的其他小部件对其做出反应？

  2. paintEvent 不是这样的简单代码，当我在这部分添加每个函数时，它会占用非常高的 CPU 使用率。我该如何管理它？

     import sys
 from PyQt5.QtWidgets import QApplication, QDialog, QListWidget, 
 QComboBox, QVBoxLayout, QPushButton, QLabel, QMainWindow, QWidget, 
 QHBoxLayout, QVBoxLayout, 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, 0, painter.device().width(), painter.device().height())
     painter.fillRect(rect, brush)

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

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

     self.update()

     painter.end()


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

     self.setWindowTitle("Graph")

     MainPanelLayout = QHBoxLayout()

     MainPanelLayout.setContentsMargins(1,1,1,1)
     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_()

标签： pythonpyqt5onmousemovepainteventcross-hair-label

解决方案

我找到了方法！我使用信号和插槽在实例之间进行通信

愿它也适用于其他人:)

import sys
from PyQt5.QtWidgets import QApplication, QDialog, QListWidget,QComboBox, QVBoxLayout, QPushButton, QLabel, QMainWindow,QWidget, QHBoxLayout, QVBoxLayout, 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, 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, 1, Qt.SolidLine))     
            painter.drawText(5, 15,FxMainForm.studyItem[0]+' ('+FxMainForm.studyItem[1]+') ')
            Boom.xPos=self.x/self.width()
    else:
        painter.setPen(QPen(Qt.red, 1, Qt.SolidLine))  
        painter.drawLine(int(Boom.xPos*painter.device().width()), self.ySpace,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(1,1,1,1)
    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_()

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