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# coding=utf-8
"""QGIS plugin implementation.
.. note:: 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.
.. note:: This source code was copied from the 'postgis viewer' application
with original authors:
Copyright (c) 2010 by Ivan Mincik, ivan.mincik@gista.sk
Copyright (c) 2011 German Carrillo, geotux_tuxman@linuxmail.org
Copyright (c) 2014 Tim Sutton, tim@linfiniti.com
"""
from __future__ import absolute_import
__author__ = 'tim@linfiniti.com'
__revision__ = '$Format:%H$'
__date__ = '10/01/2011'
__copyright__ = (
'Copyright (c) 2010 by Ivan Mincik, ivan.mincik@gista.sk and '
'Copyright (c) 2011 German Carrillo, geotux_tuxman@linuxmail.org'
'Copyright (c) 2014 Tim Sutton, tim@linfiniti.com'
)
import logging
from PyQt4.QtCore import QObject, pyqtSlot, pyqtSignal
from qgis.core import QgsMapLayerRegistry
from qgis.gui import QgsMapCanvasLayer
LOGGER = logging.getLogger('QGIS')
#noinspection PyMethodMayBeStatic,PyPep8Naming
class QgisInterface(QObject):
"""Class to expose QGIS objects and functions to plugins.
This class is here for enabling us to run unit tests only,
so most methods are simply stubs.
"""
currentLayerChanged = pyqtSignal(QgsMapCanvasLayer)
def __init__(self, canvas):
"""Constructor
:param canvas:
"""
QObject.__init__(self)
self.canvas = canvas
# Set up slots so we can mimic the behaviour of QGIS when layers
# are added.
LOGGER.debug('Initialising canvas...')
# noinspection PyArgumentList
QgsMapLayerRegistry.instance().layersAdded.connect(self.addLayers)
# noinspection PyArgumentList
QgsMapLayerRegistry.instance().layerWasAdded.connect(self.addLayer)
# noinspection PyArgumentList
QgsMapLayerRegistry.instance().removeAll.connect(self.removeAllLayers)
# For processing module
self.destCrs = None
@pyqtSlot('QStringList')
def addLayers(self, layers):
"""Handle layers being added to the registry so they show up in canvas.
:param layers: list<QgsMapLayer> list of map layers that were added
.. note:: The QgsInterface api does not include this method,
it is added here as a helper to facilitate testing.
"""
#LOGGER.debug('addLayers called on qgis_interface')
#LOGGER.debug('Number of layers being added: %s' % len(layers))
#LOGGER.debug('Layer Count Before: %s' % len(self.canvas.layers()))
current_layers = self.canvas.layers()
final_layers = []
for layer in current_layers:
final_layers.append(QgsMapCanvasLayer(layer))
for layer in layers:
final_layers.append(QgsMapCanvasLayer(layer))
self.canvas.setLayerSet(final_layers)
#LOGGER.debug('Layer Count After: %s' % len(self.canvas.layers()))
@pyqtSlot('QgsMapLayer')
def addLayer(self, layer):
"""Handle a layer being added to the registry so it shows up in canvas.
:param layer: list<QgsMapLayer> list of map layers that were added
.. note: The QgsInterface api does not include this method, it is added
here as a helper to facilitate testing.
.. note: The addLayer method was deprecated in QGIS 1.8 so you should
not need this method much.
"""
pass
@pyqtSlot()
def removeAllLayers(self):
"""Remove layers from the canvas before they get deleted."""
self.canvas.setLayerSet([])
def newProject(self):
"""Create new project."""
# noinspection PyArgumentList
QgsMapLayerRegistry.instance().removeAllMapLayers()
# ---------------- API Mock for QgsInterface follows -------------------
def zoomFull(self):
"""Zoom to the map full extent."""
pass
def zoomToPrevious(self):
"""Zoom to previous view extent."""
pass
def zoomToNext(self):
"""Zoom to next view extent."""
pass
def zoomToActiveLayer(self):
"""Zoom to extent of active layer."""
pass
def addVectorLayer(self, path, base_name, provider_key):
"""Add a vector layer.
:param path: Path to layer.
:type path: str
:param base_name: Base name for layer.
:type base_name: str
:param provider_key: Provider key e.g. 'ogr'
:type provider_key: str
"""
pass
def addRasterLayer(self, path, base_name):
"""Add a raster layer given a raster layer file name
:param path: Path to layer.
:type path: str
:param base_name: Base name for layer.
:type base_name: str
"""
pass
def activeLayer(self):
"""Get pointer to the active layer (layer selected in the legend)."""
# noinspection PyArgumentList
layers = QgsMapLayerRegistry.instance().mapLayers()
for item in layers:
return layers[item]
def addToolBarIcon(self, action):
"""Add an icon to the plugins toolbar.
:param action: Action to add to the toolbar.
:type action: QAction
"""
pass
def removeToolBarIcon(self, action):
"""Remove an action (icon) from the plugin toolbar.
:param action: Action to add to the toolbar.
:type action: QAction
"""
pass
def addToolBar(self, name):
"""Add toolbar with specified name.
:param name: Name for the toolbar.
:type name: str
"""
pass
def mapCanvas(self):
"""Return a pointer to the map canvas."""
return self.canvas
def mainWindow(self):
"""Return a pointer to the main window.
In case of QGIS it returns an instance of QgisApp.
"""
pass
def addDockWidget(self, area, dock_widget):
"""Add a dock widget to the main window.
:param area: Where in the ui the dock should be placed.
:type area:
:param dock_widget: A dock widget to add to the UI.
:type dock_widget: QDockWidget
"""
pass
def legendInterface(self):
"""Get the legend."""
return self.canvas