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+# coding: utf-8
+# /*##########################################################################
+#
+# Copyright (c) 2016 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.
+#
+# ###########################################################################*/
+"""
+This module contains an :class:`ImageFileDialog`.
+"""
+
+__authors__ = ["V. Valls"]
+__license__ = "MIT"
+__date__ = "12/02/2018"
+
+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
+try:
+ import fabio
+except ImportError:
+ fabio = None
+
+
+_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 None
+ return len(self.__shape) > 2
+
+ def getSelectedData(self, data):
+ slicing = self.slicing()
+ image = data[slicing]
+ return image
+
+ def setData(self, data):
+ 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)
+
+
+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")
+
+
+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")
+ """
+
+ 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)