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position_correction_dockwidget.py
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position_correction_dockwidget.py
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# -*- coding: utf-8 -*-
"""
/***************************************************************************
PositionCorrectionDockWidget
A QGIS plugin
Defines the interactions between widgets in GUI.
-------------------
begin : 2016-02-12
git sha : $Format:%H$
copyright : (C) 2016 by Ondřej Pešek
email : pesej.ondrek@gmail.com
***************************************************************************/
/***************************************************************************
* *
* 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
from qgis.PyQt import QtGui, uic
from qgis.PyQt.QtCore import pyqtSignal, QThread
from qgis.PyQt.QtWidgets import QDockWidget, QFileDialog, QProgressBar, QPushButton
from qgis.gui import QgsProjectionSelectionDialog, QgsMessageBar
from qgis.core import QgsCoordinateReferenceSystem, Qgis
from .move import Move
from . import show_as_layer
FORM_CLASS, _ = uic.loadUiType(os.path.join(
os.path.dirname(__file__), 'position_correction_dockwidget_base.ui'))
class PositionCorrectionDockWidget(QDockWidget, FORM_CLASS):
closingPlugin = pyqtSignal()
def __init__(self, iface, parent=None):
"""Constructor"""
super(PositionCorrectionDockWidget, self).__init__(parent)
# Set up the user interface from Designer.
# After setupUI you can access any designer object by doing
# self.<objectname>, and you can use autoconnect slots - see
# http://qt-project.org/doc/qt-4.8/designer-using-a-ui-file.html
# #widgets-and-dialogs-with-auto-connect
self.setupUi(self)
self.stylePath = None
self.iface = iface
self.computationRunning = False
self.inputButton.clicked.connect(self.select_input)
self.outputButton.clicked.connect(self.select_output)
self.style.clicked.connect(self.select_style)
self.showInput.clicked.connect(self.show_input)
self.ellipsoidSelector.clicked.connect(self.select_ellipsoid)
self.input.textChanged.connect(self.able_solve) # enable solve button
self.output.textChanged.connect(self.able_solve)
self.value.textChanged.connect(self.able_solve)
self.input.textChanged.connect(self.able_show) # enable showInput btn
self.solve.clicked.connect(self.solve_clicked)
def select_input(self):
"""select csv file to edit"""
self.filePath = QFileDialog.getOpenFileName(
self, 'Load file', '.', 'Comma Seperated Values (*.csv)')
if self.filePath:
self.filePath = os.path.normpath(self.filePath[0])
else:
return
self.input.setText(self.filePath)
self.output.setText(self.filePath[:-4]+'_shifted.csv')
def select_style(self):
"""select qml style file"""
self.stylePath = QFileDialog.getOpenFileName(
self, 'Load file (Cancel causes "No style")',
os.path.join(os.path.dirname(__file__), 'styles'),
'Qt Meta Language (*.qml)')
if self.stylePath:
self.stylePath = os.path.normpath(self.stylePath[0])
styleName = self.stylePath.split(os.path.sep)
styleName = styleName[len(styleName)-1][:-4]
self.style.setText(styleName)
else:
self.stylePath = None
self.style.setText('No style')
def select_output(self):
"""choose directory to save returned data"""
self.outputDir = QtGui.QFileDialog.getExistingDirectory(self,
'Save to file')
if not self.outputDir:
return
self.directory = os.path.normpath(self.outputDir) + os.path.sep + \
'shifted_data.csv'
self.output.setText(self.directory)
def able_solve(self):
"""set Solve button enable"""
if self.input.text() and self.output.text() and self.value.text():
self.solve.setEnabled(True)
else:
self.solve.setEnabled(False)
def able_show(self):
"""set showInput button enable"""
if self.input.text():
self.showInput.setEnabled(True)
else:
self.showInput.setEnabled(False)
def solve_clicked(self):
"""call computing"""
if self.computationRunning is not True:
self.start_computing()
def show_input(self):
"""show input csv as layer"""
show_as_layer.show(self.input.text(), self.stylePath)
def select_ellipsoid(self):
"""raise a dialog to choose the desired ellipsoid"""
projSelector = QgsProjectionSelectionDialog()
projSelector.exec_()
crs = projSelector.crs()
if crs.isValid():
if crs.ellipsoidAcronym() != '':
self.ellipsoidSelector.setText(crs.ellipsoidAcronym())
else:
self.ellipsoidSelector.setText('WGS84')
def start_computing(self):
"""computing called in new thread and showing a progressBar"""
computation = Move(self.input.text(), self.output.text(),
self.ellipsoidSelector.text(), self.units.currentText(),
self.value.text())
messageBar = self.iface.messageBar().createMessage('Computing...')
progressBar = QProgressBar()
cancelButton = QPushButton()
cancelButton.setText('Cancel')
messageBar.layout().addWidget(progressBar)
messageBar.layout().addWidget(cancelButton)
computationThread = QThread(self)
computation.moveToThread(computationThread)
computation.finished.connect(self.computing_finished)
computation.progress.connect(progressBar.setValue)
cancelButton.clicked.connect(self.cancel_computing)
computationThread.started.connect(computation.shift)
computation.error.connect(self.value_error)
self.iface.messageBar().pushWidget(messageBar, Qgis.Info)
if not computationThread.isRunning():
self.computationRunning = True
computationThread.start()
self.computation = computation
self.computationThread = computationThread
self.messageBar = messageBar
def computing_finished(self):
"""show new layer and clean up after threads"""
if self.computation.abort is not True:
show_as_layer.show(self.output.text(), self.stylePath)
self.computation.deleteLater()
self.computationThread.quit()
self.computationThread.wait()
self.computationThread.deleteLater()
self.iface.messageBar().popWidget(self.messageBar)
self.computationRunning = False
def cancel_computing(self):
"""clicked on the Cancel button in messageBar"""
self.computation.abort = True
os.remove(self.output.text())
def value_error(self, e):
"""error in input values"""
QtGui.QMessageBox.critical(None,
"ERROR: Invalid number of values",
"{0}".format(e), QtGui.QMessageBox.Abort)
self.computation.deleteLater()
self.computationThread.quit()
self.computationThread.wait()
self.computationThread.deleteLater()
self.iface.messageBar().popWidget(self.messageBar)
self.computationRunning = False
def close_event(self, event): # closeEvent
self.closingPlugin.emit()
event.accept()