引用：Search/Filter custom Widgets for QListWidget

• https://stackoverflow.com/questions/53157962/search-filter-custom-widgets-for-qlistwidget

  class MainWindow(QtWidgets.QDialog):
      def __init__(self, data, parent=None):
          super(MainWindow, self).__init__(parent)
          self.data = data
          self.ui = Ui_Main()
          self.ui.setupUi(self)
          self.ui.search_box.textChanged.connect(self.on_textChanged)
          self.set_catalog_data()
  
      def set_catalog_data(self):
          for item in self.data:
              # print(item)
              metadata = MetadataForm(item)
              lst_item = QtWidgets.QListWidgetItem()
              self.ui.catalog_list_wid.insertItem(
                  self.ui.catalog_list_wid.count(),
                  lst_item
              )
              self.ui.catalog_list_wid.setItemWidget(lst_item, metadata)
              lst_item.setSizeHint(metadata.sizeHint())
  
      @QtCore.pyqtSlot(str)
      def on_textChanged(self, text):
          for row in range(self.ui.catalog_list_wid.count()):
              it = self.ui.catalog_list_wid.item(row)
              widget = self.ui.catalog_list_wid.itemWidget(it)
              if text:
                  it.setHidden(not self.filter(text, widget.keywords))
              else:
                  it.setHidden(False)
  
      def filter(self, text, keywords):
          # foo filter
          # in the example the text must be in keywords
          return text in keywords