pyqt5 - Implementing a custom Horizontal ScrollBar for Qtextbrowser

Question

I am making a pyqt widget to show bigger log files (1GB+). I will load them on demand. I have a Qtextbrowser in which I will read first N lines and after scrolling then i will load further. I don't want to use internal scrollbars of Qtetxbrowse as I have a separate lineNumber widget as well. hence I want to implement a custom vertical and hoxizontal scrollBar which will work as internal scrllbars. I have done vertical scrollBar implemeentation. I am facing follwoing issue while implementing Horzontal scrollBar

• Clicking on side of scrollbar doesn't scroll one character, instead it take 4-5 click to pass one character.
• Scrolling is too much slow with it
• Size(length) of horizontal scroll is not same as internal Horizontal scrollbar

class MyQTextBrowser(QTextBrowser):
    resized = pyqtSignal()
    def __init__(self, parent=None):
        super().__init__(parent)

    def setVerticalScrollBar(self,obj):
        self.VerticalScrollBar = obj

    def resizeEvent(self,event):
        super().resizeEvent(event)
        self.resized.emit()
    
    def wheelEvent(self, event):
        self.VerticalScrollBar.wheelEvent(event)
        super().wheelEvent(event)

    def keyPressEvent(self,event):
        self.VerticalScrollBar.keyPressEvent(event)
        super().keyPressEvent(event)
    

class LazyQTextBrowser(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()
        self.__initUi()

    def __initUi(self):
        self.textBrowser = MyQTextBrowser(self)
        self.textBrowser.setReadOnly(True)
        self.textBrowser.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Expanding)

        self.vertical_scrollbar = QScrollBar(self)
        self.horizontal_scrollbar = QScrollBar(Qt.Horizontal,self)

        self.textBrowser.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        self.textBrowser.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)

        self.textBrowser.setVerticalScrollBar(self.vertical_scrollbar)
        self.textBrowser.setVerticalScrollBar2(self.horizontal_scrollbar)    

        main_layout = QVBoxLayout()
        text_edit_layout = QHBoxLayout()
        text_edit_layout.addWidget(self.textBrowser)
        text_edit_layout.addWidget(self.vertical_scrollbar)
        main_layout.addLayout(text_edit_layout)
        main_layout.addWidget(self.horizontal_scrollbar)
        self.setLayout(main_layout)

        self.textBrowser.resized.connect(self.textBrowserResized)
        self.vertical_scrollbar.valueChanged.connect(self.textBrowser.verticalScrollBar().setValue)
        self.horizontal_scrollbar.valueChanged.connect(lambda x : self.refreshData())
        self.horizontal_scrollbar.setVisible(False)

    def refreshData(self):
        self.textBrowser.horizontalScrollBar().setValue(self.horizontal_scrollbar.value())
        internal_slider_length = self.textBrowser.horizontalScrollBar().maximum()
        if internal_slider_length > 0:
            self.horizontal_scrollbar.setVisible(True)
            self.horizontal_scrollbar.setRange(0, internal_slider_length)
            # Slider height
            internal_slider_height = self.textBrowser.horizontalScrollBar().sizeHint().height()
            self.horizontal_scrollbar.setStyleSheet("QScrollBar:horizontal { height: " + str(internal_slider_height + 2) + "px; }")
            # Slider length
            self.horizontal_scrollbar.setPageStep(internal_slider_length) 
        else:
            self.horizontal_scrollbar.setVisible(False)