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# coding: utf-8
# /*##########################################################################
#
# Copyright (C) 2016-2018 European Synchrotron Radiation Facility
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# ###########################################################################*/
__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "16/10/2020"
import logging
from silx.gui import qt
from ..model.DataModel import DataModel
from ..model.ImageModel import ImageFromFilenameModel
from ..model.ImageModel import ImageFilenameModel
import pyFAI.io.image
_logger = logging.getLogger(__name__)
class FileEdit(qt.QLineEdit):
"""
QLineEdit connected to a DataModel containing a file or nothing.
It allows to edit a float value which can be nonified (by the use of an
empty string).
"""
sigValueAccepted = qt.Signal()
"""Emitted when a file was accepted.
In case the value is still the same, no signal is sent from the DataModel,
but this signal is emitted."""
def __init__(self, parent=None):
super(FileEdit, self).__init__(parent)
self.__model = None
self.__applyedWhenFocusOut = True
self.__previousText = None
self.__wasModified = False
self.editingFinished.connect(self.__editingFinished)
self.returnPressed.connect(self.__returnPressed)
def event(self, event):
if event.type() == 207:
if self.__previousText != self.text():
# TODO: This tries to capture Linux copy-paste using middle mouse
# button. But this event do not match exactly what it is intented.
# None of the available events capture this special copy-paste.
self.__wasModified = True
return qt.QLineEdit.event(self, event)
def focusInEvent(self, event):
self.__previousText = self.text()
self.__wasModified = False
super(FileEdit, self).focusInEvent(event)
def dragEnterEvent(self, event):
if self.__model is not None:
if event.mimeData().hasFormat("text/uri-list"):
event.acceptProposedAction()
elif event.mimeData().hasFormat("application/x-silx-uri"):
event.acceptProposedAction()
def dropEvent(self, event):
mimeData = event.mimeData()
if mimeData.hasFormat("application/x-silx-uri"):
byteString = event.mimeData().data("application/x-silx-uri")
path = byteString.data().decode("utf-8")
elif mimeData.hasUrls():
urls = mimeData.urls()
if len(urls) > 1:
qt.QMessageBox.critical(self, "Drop cancelled", "A single file is expected")
return
path = urls[0].toLocalFile()
else:
qt.QMessageBox.critical(self, "Drop cancelled", "A file is expected")
return
old = self.blockSignals(True)
self.setText(path)
self.blockSignals(old)
self.__applyFilename(path)
def setModel(self, model):
if self.__model is not None:
self.__model.changed.disconnect(self.__modelChanged)
self.__model = model
if self.__model is not None:
self.__model.changed.connect(self.__modelChanged)
self.__modelChanged()
def model(self):
return self.__model
def keyPressEvent(self, event):
if event.key() in (qt.Qt.Key_Return, qt.Qt.Key_Enter):
self.__returnPressed()
event.accept()
elif event.key() == qt.Qt.Key_Escape:
self.__cancelText()
event.accept()
else:
result = super(FileEdit, self).keyPressEvent(event)
if event.isAccepted():
self.__wasModified = True
return result
def __modelChanged(self):
self.__cancelText()
def __editingFinished(self):
if not self.__wasModified:
self.__cancelText()
elif self.__applyedWhenFocusOut:
self.__applyText()
else:
self.__cancelText()
def __returnPressed(self):
self.__applyText()
def __applyText(self):
text = self.text()
if text == self.__previousText:
self.sigValueAccepted.emit()
return
if text.strip() == "":
value = None
else:
value = text
try:
self.__applyFilename(value)
# Avoid sending further signals
self.__previousText = text
self.sigValueAccepted.emit()
except Exception as e:
_logger.debug(e, exc_info=True)
self.__cancelText()
def __cancelText(self):
"""Reset the edited value to the original one"""
value = self.__getFilename()
if value is None:
text = ""
else:
text = value
old = self.blockSignals(True)
self.setText(text)
# Avoid sending further signals
self.__previousText = text
self.blockSignals(old)
def isApplyedWhenFocusOut(self):
return self.__applyedWhenFocusOut
def setApplyedWhenFocusOut(self, isApplyed):
self.__applyedWhenFocusOut = isApplyed
applyedWhenFocusOut = qt.Property(bool, isApplyedWhenFocusOut, setApplyedWhenFocusOut)
"""Apply the current edited value to the widget when it lose the
focus. By default the previous value is displayed.
"""
def __getFilename(self):
model = self.__model
if isinstance(model, (ImageFromFilenameModel, ImageFilenameModel)):
return self.__model.filename()
elif isinstance(model, DataModel):
return self.__model.value()
else:
assert(False)
def __applyFilename(self, filename):
model = self.__model
errorInfo = None
try:
# Avoid reentrant signal from model
model.changed.disconnect(self.__modelChanged)
# Avoid focuslost if a message is displayed
self.editingFinished.disconnect(self.__editingFinished)
if isinstance(model, ImageFromFilenameModel):
if filename is not None:
try:
data = pyFAI.io.image.read_image_data(filename)
except Exception as e:
message = "Filename '%s' not supported.<br />%s" % (filename, str(e))
title = "Loading image error"
errorInfo = title, message
_logger.error("Error while loading %s" % filename)
_logger.debug("Backtrace", exc_info=True)
data = None
else:
data, filename = None, None
with model.lockContext():
model.setValue(data)
model.setFilename(filename)
model.setSynchronized(True)
if errorInfo is not None:
title, message = errorInfo
qt.QMessageBox.critical(self, title, message)
elif isinstance(model, (DataModel, ImageFilenameModel)):
previous = model.value()
try:
model.setValue(filename)
except Exception as e:
if model.value() is not previous:
model.setValue(previous)
message = "Filename '%s' not supported.<br />%s" % (filename, str(e))
qt.QMessageBox.critical(self, "Unsupported filename", message)
else:
assert(False)
finally:
model.changed.connect(self.__modelChanged)
self.editingFinished.connect(self.__editingFinished)
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