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sg_map_tool.py
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sg_map_tool.py
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# coding=utf-8
"""Implementation for SG Downloader map tool."""
# Enable SIP v2
#from PyQt4.QtGui import QRegExpValidator, QValidator
from PyQt4.QtCore import Qt, QSettings
from PyQt4.QtGui import QProgressBar
from qgis.core import QgsFeature, QgsFeatureRequest
from qgis.gui import QgsMapTool, QgsMessageBar
from sg_utilities import (
download_sg_diagram,
province_for_point,
is_valid_sg_code,
point_to_rectangle,
write_log)
from database_manager import DatabaseManager
from sg_log import LogDialog
import os
from os.path import expanduser
DATA_DIR = os.path.join(os.path.dirname(__file__), 'data')
class SGMapTool(QgsMapTool):
"""A map tool that lets you click on a parcel to download its SG Diagram.
"""
def __init__(self, iface):
"""Constructor.
:param iface: A QGIS QgisInterface instance.
:type iface: QgisInterface
"""
canvas = iface.mapCanvas()
QgsMapTool.__init__(self, canvas)
self.canvas = canvas
self.iface = iface
self.message_bar = None
self.progress_bar = None
self.output_directory = None
self.log_file = None
self.restore_state()
sg_diagrams_database = os.path.join(DATA_DIR, 'sg_diagrams.sqlite')
self.db_manager = DatabaseManager(sg_diagrams_database)
def canvasPressEvent(self, event):
"""Slot called when a mouse press occurs on the canvas.
:param event: Canvas event containing position of click, which button
was clicked etc.
"""
pass
def canvasMoveEvent(self, event):
"""Slot called when a mouse move event occurs on the canvas.
:param event: Canvas event containing position of click, which button
was clicked etc.
"""
pass
def setup_message_bar(self):
"""Setup a QgsMessageBar for use from callback and user notifications.
"""
if self.message_bar is not None:
return
self.message_bar = self.iface.messageBar().createMessage(
self.tr('SG Diagram Downloader'),
self.tr('Please stand by while download process is in progress.'),
self.iface.mainWindow())
# Set up message bar for progress reporting
self.progress_bar = QProgressBar()
self.progress_bar.setMaximumWidth(150)
self.progress_bar.setAlignment(Qt.AlignLeft | Qt.AlignVCenter)
self.message_bar.layout().addWidget(self.progress_bar)
self.iface.messageBar().pushWidget(
self.message_bar, self.iface.messageBar().INFO)
def canvasReleaseEvent(self, event):
"""Slot called when the mouse button is released on the canvas.
:param event: Canvas event containing position of click, which button
was clicked etc.
"""
if not event.button() == Qt.LeftButton:
return
def progress_callback(current, maximum, message=None):
"""GUI based callback implementation for showing progress.
:param current: Current progress.
:type current: int
:param maximum: Maximum range (point at which task is complete.
:type maximum: int
:param message: Optional message to display in the progress bar
:type message: str, QString
"""
if message is not None:
self.message_bar.setText(message)
if self.progress_bar is not None:
self.progress_bar.setMaximum(maximum)
self.progress_bar.setValue(current)
self.iface.messageBar().pushMessage(
self.tr('SG Downloader.'),
self.tr('Preparing for download'),
level=QgsMessageBar.INFO,
duration=10)
# No need to check that it is a valid, polygon layer
# as the QAction for this map tool already does that
layer = self.canvas.currentLayer()
place = self.toMapCoordinates(event.pos())
rectangle = point_to_rectangle(place)
request = QgsFeatureRequest(QgsFeatureRequest.FilterRect)
# Ensure only those features really intersecting the rect are returned
request.setFlags(QgsFeatureRequest.ExactIntersect)
request.setFilterRect(rectangle)
polygons = layer.getFeatures(request)
feature = QgsFeature()
fetch_list = []
all_fields = layer.pendingFields()
text_fields = []
# Ignore any columns that don't contain text data
for field in all_fields:
if field.typeName() == 'String' or field.typeName() == 'Text':
text_fields.append(field)
self.setup_message_bar()
sg_field = None
while polygons.nextFeature(feature):
# geom = feature.geometry()
# attributes = feature.attributes()
# matched = False
# sg_code = None
if sg_field is None:
for field in text_fields:
value = str(feature[field.name()])
if not is_valid_sg_code(value):
continue
sg_field = field.name()
fetch_list.append(value)
else:
# We already know which column has SG codes
value = str(feature[sg_field])
fetch_list.append(value)
if len(fetch_list) == 0:
self.iface.messageBar().pushMessage(
self.tr('SG Downloader.'),
self.tr('No parcels found with a valid 21 Digit code'),
level=QgsMessageBar.WARNING,
duration=10)
return
province = province_for_point(self.db_manager, place)
report = ''
sg_diagrams_database = os.path.join(DATA_DIR, 'sg_diagrams.sqlite')
data_manager = DatabaseManager(sg_diagrams_database)
i = 0
for sg_code in fetch_list:
i += 1
message = 'Downloading SG Code %s from %s' % (sg_code, province)
progress_callback(i, len(fetch_list), message)
report += download_sg_diagram(
data_manager,
sg_code,
province,
self.output_directory,
callback=progress_callback)
data_manager.close()
try:
write_log(report, self.log_file)
except IOError as e:
print e
self.show_log(report, self.log_file)
def show_log(self, log, log_path):
"""Show log dialog.
:param log: Log in text
:type log: str
:param log_path: Log file path.
:type log_path: str
"""
dialog = LogDialog(self.iface)
dialog.set_log(log, log_path)
dialog.exec_()
def restore_state(self):
"""Restore state from previous session."""
home_user = expanduser("~")
default_log_file = os.path.join(home_user, 'sg_downloader.log')
previous_settings = QSettings()
self.output_directory = str(previous_settings.value(
'sg-diagram-downloader/output_directory', home_user, type=str))
self.log_file = str(previous_settings.value(
'sg-diagram-downloader/log_file', default_log_file, type=str))