@Archie_7

Почему плагин на QGis выполняет расчет с момента запуска, а не когда пользователь нажимает на кнопку, отвечающую за запуск расчета?

Сделал плагин для Qgis, который бы считал сумму определенного показателя выбранных объектов. Логика была такова, что просчет начинался, когда пользователь нажимает на кнопку (здесь объект называется sumButton) и выводит значение в виде объекта label. Но расчет суммы начинается не тогда, когда я нажимаю кнопку, а при запуске плагина, сама кнопка не работает, соответственно, чтобы посчитать сумму других объектов, надо плагин закрыть и открыть снова.

При запуске в журнале выдается следующее сообщение:
2024-03-03T21:53:19 WARNING Traceback (most recent call last):
File "C:\Users/d.arhipov/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\sumarea\SumArea.py", line 254, in run
self.dockwidget.sumButton.clicked.connect(self.select_features())
TypeError: argument 1 has unexpected type 'NoneType'


from qgis.PyQt.QtCore import QSettings, QTranslator, QCoreApplication, Qt
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QAction
# Initialize Qt resources from file resources.py
from .resources import *

from qgis.PyQt.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from qgis.PyQt.QtSql import QSqlDatabase, QSqlQuery
from PyQt5.QtWidgets import QTableView, QApplication
from urllib.request import urlopen
from qgis.core import *
from qgis.gui import *
from qgis.gui import QgsMapToolEmitPoint 
from qgis.utils import iface
from qgis.gui import QgsMapTool

# Import the code for the DockWidget
from .SumArea_dockwidget import SumAreaDockWidget
import os.path


class SumArea:
    """QGIS Plugin Implementation."""

    def __init__(self, iface):
        """Constructor.

        :param iface: An interface instance that will be passed to this class
            which provides the hook by which you can manipulate the QGIS
            application at run time.
        :type iface: QgsInterface
        """
        # Save reference to the QGIS interface
        self.iface = iface

        # initialize plugin directory
        self.plugin_dir = os.path.dirname(__file__)

        # initialize locale
        locale = QSettings().value('locale/userLocale')[0:2]
        locale_path = os.path.join(
            self.plugin_dir,
            'i18n',
            'SumArea_{}.qm'.format(locale))

        if os.path.exists(locale_path):
            self.translator = QTranslator()
            self.translator.load(locale_path)
            QCoreApplication.installTranslator(self.translator)

        # Declare instance attributes
        self.actions = []
        self.menu = self.tr(u'&SumArea')
        # TODO: We are going to let the user set this up in a future iteration
        self.toolbar = self.iface.addToolBar(u'SumArea')
        self.toolbar.setObjectName(u'SumArea')

        #print "** INITIALIZING SumArea"

        self.pluginIsActive = False
        self.dockwidget = None


    # noinspection PyMethodMayBeStatic
    def tr(self, message):
        """Get the translation for a string using Qt translation API.

        We implement this ourselves since we do not inherit QObject.

        :param message: String for translation.
        :type message: str, QString

        :returns: Translated version of message.
        :rtype: QString
        """
        # noinspection PyTypeChecker,PyArgumentList,PyCallByClass
        return QCoreApplication.translate('SumArea', message)


    def add_action(
        self,
        icon_path,
        text,
        callback,
        enabled_flag=True,
        add_to_menu=True,
        add_to_toolbar=True,
        status_tip=None,
        whats_this=None,
        parent=None):
        """Add a toolbar icon to the toolbar.

        :param icon_path: Path to the icon for this action. Can be a resource
            path (e.g. ':/plugins/foo/bar.png') or a normal file system path.
        :type icon_path: str

        :param text: Text that should be shown in menu items for this action.
        :type text: str

        :param callback: Function to be called when the action is triggered.
        :type callback: function

        :param enabled_flag: A flag indicating if the action should be enabled
            by default. Defaults to True.
        :type enabled_flag: bool

        :param add_to_menu: Flag indicating whether the action should also
            be added to the menu. Defaults to True.
        :type add_to_menu: bool

        :param add_to_toolbar: Flag indicating whether the action should also
            be added to the toolbar. Defaults to True.
        :type add_to_toolbar: bool

        :param status_tip: Optional text to show in a popup when mouse pointer
            hovers over the action.
        :type status_tip: str

        :param parent: Parent widget for the new action. Defaults None.
        :type parent: QWidget

        :param whats_this: Optional text to show in the status bar when the
            mouse pointer hovers over the action.

        :returns: The action that was created. Note that the action is also
            added to self.actions list.
        :rtype: QAction
        """

        icon = QIcon(icon_path)
        action = QAction(icon, text, parent)
        action.triggered.connect(callback)
        action.setEnabled(enabled_flag)

        if status_tip is not None:
            action.setStatusTip(status_tip)

        if whats_this is not None:
            action.setWhatsThis(whats_this)

        if add_to_toolbar:
            self.toolbar.addAction(action)

        if add_to_menu:
            self.iface.addPluginToMenu(
                self.menu,
                action)

        self.actions.append(action)

        return action


    def initGui(self):
        """Create the menu entries and toolbar icons inside the QGIS GUI."""

        icon_path = ':/plugins/SumArea/icon.png'
        self.add_action(
            icon_path,
            text=self.tr(u''),
            callback=self.run,
            parent=self.iface.mainWindow())

    def select_features(self):
        layer = self.iface.activeLayer()
        features = layer.selectedFeatures()
        area = sum([f.attributes()[5] for f in features])
        self.dockwidget.label.setText(str(area))
        print(area)

        

    #--------------------------------------------------------------------------

    def onClosePlugin(self):
        """Cleanup necessary items here when plugin dockwidget is closed"""

        #print "** CLOSING SumArea"

        # disconnects
        self.dockwidget.closingPlugin.disconnect(self.onClosePlugin)

        # remove this statement if dockwidget is to remain
        # for reuse if plugin is reopened
        # Commented next statement since it causes QGIS crashe
        # when closing the docked window:
        # self.dockwidget = None

        self.pluginIsActive = False


    def unload(self):
        """Removes the plugin menu item and icon from QGIS GUI."""

        #print "** UNLOAD SumArea"

        for action in self.actions:
            self.iface.removePluginMenu(
                self.tr(u'&SumArea'),
                action)
            self.iface.removeToolBarIcon(action)
        # remove the toolbar
        del self.toolbar

    #--------------------------------------------------------------------------

    def run(self):
        """Run method that loads and starts the plugin"""

        if not self.pluginIsActive:
            self.pluginIsActive = True

            #print "** STARTING SumArea"

            # dockwidget may not exist if:
            #    first run of plugin
            #    removed on close (see self.onClosePlugin method)
            if self.dockwidget == None:
                # Create the dockwidget (after translation) and keep reference
                self.dockwidget = SumAreaDockWidget()

            # connect to provide cleanup on closing of dockwidget
            self.dockwidget.closingPlugin.connect(self.onClosePlugin)

            # show the dockwidget
            # TODO: fix to allow choice of dock location
            self.iface.addDockWidget(Qt.TopDockWidgetArea, self.dockwidget)
            self.dockwidget.show()
            self.dockwidget.sumButton.clicked.connect(self.select_features())
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