Learn QGIS - Fourth Edition

Implementing plugin functionality

The layer combo box is empty and we want to add layers to it. To achieve this, we need to add a few lines of code to my_first_plugin.py (located in the plugin folder). Firstly, make sure all the imports are correct:

from PyQt5.QtCore import QSettings, QTranslator, qVersion, QCoreApplicationfrom PyQt5.QtGui import QIconfrom PyQt5.QtWidgets import QActionfrom qgis.core import *# Initialize Qt resources from file resources.pyfrom .resources import *# Import the code for the dialogfrom .my_first_plugin_dialog import MyFirstPluginDialogimport os.path

Then change the run() method:

def run(self):        """Run method that performs all the real work"""        # show the dialog        self.dlg.show()        # clear the combo box self.dlg.layerCombo.clear() ...