# coding: utf-8
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"""
This module contains an :class:`ImageFileDialog`.
"""
__authors__ = ["V. Valls"]
__license__ = "MIT"
__date__ = "05/03/2019"
import logging
from silx.gui.plot import actions
from silx.gui import qt
from silx.gui.plot.PlotWidget import PlotWidget
from .AbstractDataFileDialog import AbstractDataFileDialog
import silx.io
_logger = logging.getLogger(__name__)
class _ImageSelection(qt.QWidget):
"""Provide a widget allowing to select an image from an hypercube by
selecting a slice."""
selectionChanged = qt.Signal()
"""Emitted when the selection change."""
def __init__(self, parent=None):
qt.QWidget.__init__(self, parent)
self.__shape = None
self.__axis = []
layout = qt.QVBoxLayout()
self.setLayout(layout)
def hasVisibleSelectors(self):
return self.__visibleSliders > 0
def isUsed(self):
if self.__shape is None:
return False
return len(self.__shape) > 2
def getSelectedData(self, data):
slicing = self.slicing()
image = data[slicing]
return image
def setData(self, data):
if data is None:
self.__visibleSliders = 0
return
shape = data.shape
if self.__shape is not None:
# clean up
for widget in self.__axis:
self.layout().removeWidget(widget)
widget.deleteLater()
self.__axis = []
self.__shape = shape
self.__visibleSliders = 0
if shape is not None:
# create expected axes
for index in range(len(shape) - 2):
axis = qt.QSlider(self)
axis.setMinimum(0)
axis.setMaximum(shape[index] - 1)
axis.setOrientation(qt.Qt.Horizontal)
if shape[index] == 1:
axis.setVisible(False)
else:
self.__visibleSliders += 1
axis.valueChanged.connect(self.__axisValueChanged)
self.layout().addWidget(axis)
self.__axis.append(axis)
self.selectionChanged.emit()
def __axisValueChanged(self):
self.selectionChanged.emit()
def slicing(self):
slicing = []
for axes in self.__axis:
slicing.append(axes.value())
return tuple(slicing)
def setSlicing(self, slicing):
for i, value in enumerate(slicing):
if i > len(self.__axis):
break
self.__axis[i].setValue(value)
def selectSlicing(self, slicing):
"""Select a slicing.
The provided value could be unconsistent and therefore is not supposed
to be retrivable with a getter.
:param Union[None,Tuple[int]] slicing:
"""
if slicing is None:
# Create a default slicing
needed = self.__visibleSliders
slicing = (0,) * needed
if len(slicing) < self.__visibleSliders:
slicing = slicing + (0,) * (self.__visibleSliders - len(slicing))
self.setSlicing(slicing)
class _ImagePreview(qt.QWidget):
"""Provide a preview of the selected image"""
def __init__(self, parent=None):
super(_ImagePreview, self).__init__(parent)
self.__data = None
self.__plot = PlotWidget(self)
self.__plot.setAxesDisplayed(False)
self.__plot.setKeepDataAspectRatio(True)
layout = qt.QVBoxLayout()
layout.setContentsMargins(0, 0, 0, 0)
layout.addWidget(self.__plot)
self.setLayout(layout)
def resizeEvent(self, event):
self.__updateConstraints()
return qt.QWidget.resizeEvent(self, event)
def sizeHint(self):
return qt.QSize(200, 200)
def plot(self):
return self.__plot
def setData(self, data, fromDataSelector=False):
if data is None:
self.clear()
return
resetzoom = not fromDataSelector
previousImage = self.data()
if previousImage is not None and data.shape != previousImage.shape:
resetzoom = True
self.__plot.addImage(legend="data", data=data, resetzoom=resetzoom)
self.__data = data
self.__updateConstraints()
def __updateConstraints(self):
"""
Update the constraints depending on the size of the widget
"""
image = self.data()
if image is None:
return
size = self.size()
if size.width() == 0 or size.height() == 0:
return
heightData, widthData = image.shape
widthContraint = heightData * size.width() / size.height()
if widthContraint > widthData:
heightContraint = heightData
else:
heightContraint = heightData * size.height() / size.width()
widthContraint = widthData
midWidth, midHeight = widthData * 0.5, heightData * 0.5
heightContraint, widthContraint = heightContraint * 0.5, widthContraint * 0.5
axis = self.__plot.getXAxis()
axis.setLimitsConstraints(midWidth - widthContraint, midWidth + widthContraint)
axis = self.__plot.getYAxis()
axis.setLimitsConstraints(midHeight - heightContraint, midHeight + heightContraint)
def __imageItem(self):
image = self.__plot.getImage("data")
return image
def data(self):
if self.__data is not None:
if hasattr(self.__data, "name"):
# in case of HDF5
if self.__data.name is None:
# The dataset was closed
self.__data = None
return self.__data
def colormap(self):
image = self.__imageItem()
if image is not None:
return image.getColormap()
return self.__plot.getDefaultColormap()
def setColormap(self, colormap):
self.__plot.setDefaultColormap(colormap)
def clear(self):
self.__data = None
image = self.__imageItem()
if image is not None:
self.__plot.removeImage(legend="data")
[docs]class ImageFileDialog(AbstractDataFileDialog):
"""The `ImageFileDialog` class provides a dialog that allow users to select
an image from a file.
The `ImageFileDialog` class enables a user to traverse the file system in
order to select one file. Then to traverse the file to select a frame or
a slice of a dataset.
.. image:: img/imagefiledialog_h5.png
It supports fast access to image files using `FabIO`. Which is not the case
of the default silx API. Image files still also can be available using the
NeXus layout, by editing the file type combo box.
.. image:: img/imagefiledialog_edf.png
The selected data is an numpy array with 2 dimension.
Using an `ImageFileDialog` can be done like that.
.. code-block:: python
dialog = ImageFileDialog()
result = dialog.exec_()
if result:
print("Selection:")
print(dialog.selectedFile())
print(dialog.selectedUrl())
print(dialog.selectedImage())
else:
print("Nothing selected")
"""
[docs] def selectedImage(self):
"""Returns the selected image data as numpy
:rtype: numpy.ndarray
"""
url = self.selectedUrl()
return silx.io.get_data(url)
def _createPreviewWidget(self, parent):
previewWidget = _ImagePreview(parent)
previewWidget.setSizePolicy(qt.QSizePolicy.Expanding, qt.QSizePolicy.Expanding)
return previewWidget
def _createSelectorWidget(self, parent):
return _ImageSelection(parent)
def _createPreviewToolbar(self, parent, dataPreviewWidget, dataSelectorWidget):
plot = dataPreviewWidget.plot()
toolbar = qt.QToolBar(parent)
toolbar.setIconSize(qt.QSize(16, 16))
toolbar.setStyleSheet("QToolBar { border: 0px }")
toolbar.addAction(actions.mode.ZoomModeAction(plot, parent))
toolbar.addAction(actions.mode.PanModeAction(plot, parent))
toolbar.addSeparator()
toolbar.addAction(actions.control.ResetZoomAction(plot, parent))
toolbar.addSeparator()
toolbar.addAction(actions.control.ColormapAction(plot, parent))
return toolbar
def _isDataSupportable(self, data):
"""Check if the selected data can be supported at one point.
If true, the data selector will be checked and it will update the data
preview. Else the selecting is disabled.
:rtype: bool
"""
if not hasattr(data, "dtype"):
# It is not an HDF5 dataset nor a fabio image wrapper
return False
if data is None or data.shape is None:
return False
if data.dtype.kind not in set(["f", "u", "i", "b"]):
return False
dim = len(data.shape)
return dim >= 2
def _isFabioFilesSupported(self):
return True
def _isDataSupported(self, data):
"""Check if the data can be returned by the dialog.
If true, this data can be returned by the dialog and the open button
while be enabled. If false the button will be disabled.
:rtype: bool
"""
dim = len(data.shape)
return dim == 2
def _displayedDataInfo(self, dataBeforeSelection, dataAfterSelection):
"""Returns the text displayed under the data preview.
This zone is used to display error in case or problem of data selection
or problems with IO.
:param numpy.ndarray dataAfterSelection: Data as it is after the
selection widget (basically the data from the preview widget)
:param numpy.ndarray dataAfterSelection: Data as it is before the
selection widget (basically the data from the browsing widget)
:rtype: bool
"""
destination = self.__formatShape(dataAfterSelection.shape)
source = self.__formatShape(dataBeforeSelection.shape)
return u"%s \u2192 %s" % (source, destination)
def __formatShape(self, shape):
result = []
for s in shape:
if isinstance(s, slice):
v = u"\u2026"
else:
v = str(s)
result.append(v)
return u" \u00D7 ".join(result)
