Enhance FluentTitleBar

[immiProgrammer]

for customization

[immiProgrammer]

In this way user/programmer can customize titleBar in initLayout function and add widgets normaly in hboxlayout
like this self.hboxLayout.addwidget(tabBar)

[immiProgrammer]

after that u can customize titleBar like this:

class CustomTitleBar(MSFluentTitleBar):

    def __init__(self, parent):
        super().__init__(parent)
    
    def initLayout(self):
        super().initLayout()

        # add search line edit and about button
        self.searchLineEdit = SearchLineEdit(self)
        self.searchLineEdit.setPlaceholderText('搜索应用、游戏、电影、设备等')
        self.searchLineEdit.setFixedWidth(400)
        self.searchLineEdit.setClearButtonEnabled(True)

        self.aboutButton = TransparentToolButton(FIF.INFO, self)

        self.hBoxLayout.addWidget(self.searchLineEdit, 1, Qt.AlignHCenter)
        self.hBoxLayout.addWidget(self.aboutButton, 0, Qt.AlignRight)
        self.hBoxLayout.addSpacing(5)