def _print_preview(tab: apitypes.Tab) -> None:
    """Show a print preview."""
    def print_callback(ok: bool) -> None:
        if not ok:
            message.error("Printing failed!")

    tab.printing.check_preview_support()
    diag = QPrintPreviewDialog(tab)
    diag.setAttribute(Qt.WA_DeleteOnClose)
    diag.setWindowFlags(
        diag.windowFlags() |  # type: ignore[operator, arg-type]
        Qt.WindowMaximizeButtonHint |
        Qt.WindowMinimizeButtonHint)
    diag.paintRequested.connect(functools.partial(
        tab.printing.to_printer, callback=print_callback))
    diag.exec_() 

def __init__(self, *args, **kwargs):
        super(Window, self).__init__(*args, **kwargs)
        # 主屏幕的可用大小（去掉任务栏）
        self._rect = QApplication.instance().desktop().availableGeometry(self)
        self.resize(800, 600)
        self.setWindowFlags(Qt.Window
                            | Qt.FramelessWindowHint
                            | Qt.WindowSystemMenuHint
                            | Qt.WindowMinimizeButtonHint
                            | Qt.WindowMaximizeButtonHint
                            | Qt.WindowCloseButtonHint)
        # 增加薄边框
        style = win32gui.GetWindowLong(int(self.winId()), win32con.GWL_STYLE)
        win32gui.SetWindowLong(
            int(self.winId()), win32con.GWL_STYLE, style | win32con.WS_THICKFRAME)

        if QtWin.isCompositionEnabled():
            # 加上 Aero 边框阴影
            QtWin.extendFrameIntoClientArea(self, -1, -1, -1, -1)
        else:
            QtWin.resetExtendedFrame(self) 

def _createConfigUI(self):
        if self._ui_view is None:
            Logger.log("d", "Creating ImageReader config UI")
            path = os.path.join(PluginRegistry.getInstance().getPluginPath("ImageReader"), "ConfigUI.qml")
            self._ui_view = Application.getInstance().createQmlComponent(path, {"manager": self})
            self._ui_view.setFlags(self._ui_view.flags() & ~Qt.WindowCloseButtonHint & ~Qt.WindowMinimizeButtonHint & ~Qt.WindowMaximizeButtonHint)
            self._disable_size_callbacks = False 

def isMaximizeable(self):
        """是否可以最大化
        """
        return self.testWindowFlags(Qt.WindowMaximizeButtonHint) 

def __init__(self, parent=None, aw = None):
        super(ArtisanDialog,self).__init__(parent)
        self.aw = aw # the Artisan application window
        
        # IMPORTANT NOTE: if dialog items have to be access after it has been closed, this Qt.WA_DeleteOnClose attribute 
        # has to be set to False explicitly in its initializer (like in comportDlg) to avoid the early GC and one might
        # want to use a dialog.deleteLater() call to explicitly have the dialog and its widgets GCe
        # or rather use sip.delete(dialog) if the GC via .deleteLater() is prevented by a link to a parent object (parent not None)
        self.setAttribute(Qt.WA_DeleteOnClose, True)

#        if platf == 'Windows':
# setting those Windows flags could be the reason for some instabilities on Windows
#            windowFlags = self.windowFlags()
#        #windowFlags &= ~Qt.WindowContextHelpButtonHint # remove help button
#        #windowFlags &= ~Qt.WindowMaximizeButtonHint # remove maximise button
#        #windowFlags &= ~Qt.WindowMinMaxButtonsHint  # remove min/max combo
#        #windowFlags |= Qt.WindowMinimizeButtonHint  # Add minimize  button
#        windowFlags |= Qt.WindowSystemMenuHint  # Adds a window system menu, and possibly a close button
#            windowFlags |= Qt.WindowMinMaxButtonsHint  # add min/max combo
#            self.setWindowFlags(windowFlags)

        # configure standard dialog buttons
        self.dialogbuttons = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel,Qt.Horizontal)
        self.dialogbuttons.button(QDialogButtonBox.Ok).setDefault(True)
        self.dialogbuttons.button(QDialogButtonBox.Ok).setAutoDefault(True)
        self.dialogbuttons.button(QDialogButtonBox.Cancel).setDefault(False)
        self.dialogbuttons.button(QDialogButtonBox.Cancel).setAutoDefault(False)
        self.dialogbuttons.button(QDialogButtonBox.Ok).setFocusPolicy(Qt.StrongFocus) # to add to tab focus switch
        if self.aw.locale not in self.aw.qtbase_locales:
            self.dialogbuttons.button(QDialogButtonBox.Ok).setText(QApplication.translate("Button","OK", None))
            self.dialogbuttons.button(QDialogButtonBox.Cancel).setText(QApplication.translate("Button","Cancel",None))
        # add additional CMD-. shortcut to close the dialog
        self.dialogbuttons.button(QDialogButtonBox.Cancel).setShortcut(QKeySequence("Ctrl+."))
        # add additional CMD-W shortcut to close this dialog (ESC on Mac OS X)
        cancelAction = QAction(self, triggered=lambda _:self.dialogbuttons.rejected.emit())
        try:
            cancelAction.setShortcut(QKeySequence.Cancel)
        except:
            pass
        self.dialogbuttons.button(QDialogButtonBox.Cancel).addActions([cancelAction])