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gadm_loader.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
GADMloader
A QGIS plugin
Download GADM data.
Generated by Plugin Builder: http://g-sherman.github.io/Qgis-Plugin-Builder/
-------------------
begin : 2021-06-15
git sha : $Format:%H$
copyright : (C) 2021 by Matthias Weigand
email : [email protected]
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os.path
import re
from qgis.core import QgsProject, QgsVectorLayer
from qgis.PyQt.QtCore import QCoreApplication, QSettings, QTranslator
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtWidgets import QAction
# Import the code for the dialog
from .gadm_loader_dialog import GADMloaderDialog
# Initialize Qt resources from file resources.py
from .resources import *
from .utils.downloadThread import DownloadThread
from .utils.parser import get_url, parse_gadm_countries
GADM_VERSION_NO_SEP = 41
class GADMloader:
"""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", "GADMloader_{}.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("&GADM Loader")
# Check if plugin was started the first time in current QGIS session
# Must be set in initGui() to survive plugin reloads
self.first_start = None
def read_inputs(self):
self.country_name = self.dlg.cbCountry.currentText()
self.country_code = self.country_dict[self.country_name]
self.folder_name = self.dlg.qfFolder.filePath()
def on_download_clicked(self):
self.read_inputs()
self.downloadthread.set_vars(
get_url(self.country_code, GADM_VERSION_NO_SEP), self.folder_name
)
self.downloadthread.download_signal.connect(self.set_download_progress)
self.downloadthread.start()
def set_download_progress(self, value):
self.dlg.pbDownload.setValue(value)
# 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("GADMloader", 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:
# Adds plugin icon to Plugins toolbar
self.iface.addToolBarIcon(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/gadm_loader/icon.png"
self.add_action(
icon_path,
text=self.tr("Download GADM data"),
callback=self.run,
parent=self.iface.mainWindow(),
)
# will be set False in run()
self.first_start = True
def unload(self):
"""Removes the plugin menu item and icon from QGIS GUI."""
for action in self.actions:
self.iface.removePluginMenu(self.tr("&GADM Loader"), action)
self.iface.removeToolBarIcon(action)
def run(self):
"""Run method that performs all the real work"""
self.country_dict = parse_gadm_countries()
self.dlg = GADMloaderDialog(self.country_dict)
self.downloadthread = DownloadThread()
# show the dialog
self.dlg.show()
self.dlg.pbDownloadButton.clicked.connect(self.on_download_clicked)
# Run the dialog event loop
result = self.dlg.exec_()
# See if OK was pressed
if result:
self.read_inputs()
# add layer(s) to canvas
if self.dlg.cbAddLayers.isChecked():
# set up regex to check files in self.folder_name.
# it could be that there are other files, e.g. LICENSE.txt or prev. downloaded files
regx = re.compile(f"gadm{GADM_VERSION_NO_SEP}_{self.country_code}.gpkg")
# loop over all files in self.folder_name and check whether they match the settings
for f in os.listdir(self.folder_name):
if regx.match(f):
full_path = f"{self.folder_name}/{f}"
vlayer = QgsVectorLayer(
full_path, os.path.splitext(os.path.basename(f))[0], "ogr"
)
# add all sub-layers
# https://stackoverflow.com/a/57404611/3250126
sublayers = vlayer.dataProvider().subLayers()
for sl in sublayers:
name = sl.split("!!::!!")[1]
uri = "%s|layername=%s" % (
full_path,
name,
)
# Create layer
sub_vlayer = QgsVectorLayer(uri, name, "ogr")
# Add layer to map
QgsProject.instance().addMapLayer(sub_vlayer)