# Source code for PyMca5.PyMcaCore.StackPluginBase

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    # The PyMca X-Ray Fluorescence Toolkit
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    __author__ = "V.A. Sole - ESRF Data Analysis"
    __contact__ = "sole@esrf.fr"
    __license__ = "MIT"
    __copyright__ = "European Synchrotron Radiation Facility, Grenoble, France"
    __doc__ = """

    A Stack plugin is a module that will be automatically added to the PyMca stack windows
    in order to perform user defined operations on the data stack.

    Plugins can be automatically installed provided they are in the appropriate place:

        - In the user home directory (POSIX systems): *${HOME}/.pymca/plugins*
          or *${HOME}/PyMca/plugins* (older PyMca installation)
        - In *"My Documents\\\\PyMca\\\\plugins"* (Windows)

    It has to inherit the :class:`StackPluginBase` class and implement the following methods:

        - :meth:`StackPluginBase.getMethods`
        - :meth:`StackPluginBase.getMethodToolTip` (optional but convenient)
        - :meth:`StackPluginBase.getMethodPixmap` (optional)
        - :meth:`StackPluginBase.applyMethod`

    and modify the static module variable :const:`MENU_TEXT` and the static module function
    :func:`getStackPluginInstance` according to the defined plugin.

    The plugin class has access to following inherited methods:

       - :meth:`StackPluginBase.addImage`
       - :meth:`StackPluginBase.getActiveCurve`
       - :meth:`StackPluginBase.getGraphXLabel`
       - :meth:`StackPluginBase.getGraphXLimits`
       - :meth:`StackPluginBase.getGraphYLabel`
       - :meth:`StackPluginBase.getGraphYLimits`
       - :meth:`StackPluginBase.getStackData`
       - :meth:`StackPluginBase.getStackDataObject`
       - :meth:`StackPluginBase.getStackDataObjectList`
       - :meth:`StackPluginBase.getStackInfo`
       - :meth:`StackPluginBase.getStackOriginalCurve`
       - :meth:`StackPluginBase.getStackOriginalImage`
       - :meth:`StackPluginBase.getStackROIImagesAndNames`
       - :meth:`StackPluginBase.getStackSelectionMask`
       - :meth:`StackPluginBase.isStackFinite`
       - :meth:`StackPluginBase.removeImage`
       - :meth:`StackPluginBase.replaceImage`
       - :meth:`StackPluginBase.setStack`
       - :meth:`StackPluginBase.setStackSelectionMask`
       - :meth:`StackPluginBase.stackClosed`

    These plugins will be compatible with any stack window that provides the following methods:

        #data related

        - :meth:`getStackDataObject`
        - :meth:`getStackData`
        - :meth:`getStackInfo`
        - :meth:`setStack`
        - :meth:`getStackROIImagesAndNames`
        - :meth:`isStackFinite`
        - :meth:`getStackOriginalCurve`
        - :meth:`getStackOriginalImage`

        #mask related

        - :meth:`setStackSelectionMask`
        - :meth:`getStackSelectionMask`

        #displayed curves

        - :meth:`getActiveCurve`
        - :meth:`getGraphXLimits`
        - :meth:`getGraphYLimits`
        - :meth:`getGraphXLabel`
        - :meth:`getGraphYLabel`

        #images

        - :meth:`addImage`
        - :meth:`removeImage`
        - :meth:`replaceImage`

        #information method

        - :meth:`stackUpdated`
        - :meth:`selectionMaskUpdated`
        - :meth:`stackClosed`

    """
    import weakref
    import logging

    pluginBaseLogger = logging.getLogger(__name__)

    class StackPluginBase(object):
        def __init__(self, stackWindow, **kw):
            """
            stackWindow is the object instantiating the plugin.

            Unless one knows what (s)he is doing, only a proxy should be used.

            I pass the actual instance to keep all doors open.
            """
            self._stackWindow = weakref.proxy(stackWindow)
            pass

        #stack related functions
        def isStackFinite(self):
            return self._stackWindow.isStackFinite()

        def getStackROIImagesAndNames(self):
            return self._stackWindow.getStackROIImagesAndNames()

        def getStackDataObject(self):
            return self._stackWindow.getStackDataObject()

        def getStackDataObjectList(self):
            return self._stackWindow.getStackDataObjectList()

        def getStackData(self):
            return self._stackWindow.getStackData()

        def getStackOriginalCurve(self):
            return self._stackWindow.getStackOriginalCurve()

        def getStackOriginalImage(self):
            return self._stackWindow.getStackOriginalImage()

        def getStackInfo(self):
            return self._stackWindow.getStackInfo()

        def getStackSelectionMask(self):
            return self._stackWindow.getSelectionMask()

        def setStackSelectionMask(self, mask, instance_id=None):
            if instance_id is None:
                instance_id = id(self)
            return self._stackWindow.setSelectionMask(mask,
                                                      instance_id=instance_id)

        def setStack(self, *var, **kw):
            return self._stackWindow.setStack(*var, **kw)

        def addImage(self, image, name):
            return self._stackWindow.addImage(image, name)

        def removeImage(self, name):
            return self._stackWindow.removeImage(name)

        def replaceImage(self, image, name):
            return self._stackWindow.replaceImage(image, name)

        #Plot window related functions
        def getActiveCurve(self):
            """
            Function to access the currently active curve.
            It returns None in case of not having an active curve.

            Output has the form::

                xvalues, yvalues, legend, dict

            where dict is a dictionary containing curve info.

            For the time being, only the plot labels associated to the
            curve are warranted to be present under the keys xlabel, ylabel.
            """
            return self._stackWindow.getActiveCurve()

        def getGraphXLimits(self):
            """
            Get the graph X limits.
            """
            return self._stackWindow.getGraphXLimits()

        def getGraphYLimits(self):
            """
            Get the graph Y limits.
            """
            return self._stackWindow.getGraphYLimits()

        def getGraphXLabel(self):
            """
            Get the graph X label
            """
            return self._stackWindow.getGraphXLabel()

        def getGraphYLabel(self):
            """
            Get the graph Y label
            """
            return self._stackWindow.getGraphYLabel()

        def stackUpdated(self):
            pluginBaseLogger.debug("stackUpdated(self) not implemented")

        def stackROIImageListUpdated(self):
            pluginBaseLogger.debug("stackROIImageListUpdated(self) not implemented")
            return

        def stackClosed(self):
            """
            This method is called when the stack widget is closed.
            You can implement this to shut down the plugin (close widgets...).

            By default, widgets referenced as self.widget and self._widget
            are closed.
            """
            if hasattr(self, "widget") and self.widget is not None:
                self.widget.close()
            if hasattr(self, "_widget") and self._widget is not None:
                self._widget.close()

        def selectionMaskUpdated(self):
            pluginBaseLogger.debug("selectionMaskUpdated(self) not implemented")

        #Methods to be implemented by the plugin
        def getMethods(self):
            """
            A list with the NAMES  associated to the callable methods
            that are applicable to the specified stack.
            """
            pluginBaseLogger.debug("BASE STACK getMethods not implemented")
            return []

        def getMethodToolTip(self, name):
            """
            Returns the help associated to the particular method name or None.
            """
            return None

        def getMethodPixmap(self, name):
            """
            Returns the pixmap associated to the particular method name or None.
            """
            return None

        def applyMethod(self, name):
            """
            The plugin is asked to apply the method associated to name.
            """
            pluginBaseLogger.debug("applyMethod not implemented")
            return

    MENU_TEXT = "StackPluginBase"
    """This is the name of the plugin, as it appears in the plugins menu."""

    def getStackPluginInstance(stackWindow, **kw):
        """
        This function will be called by the stack window instantiating and calling
        the plugins. It passes itself as first argument, but the default implementation
        of the base class only keeps a weak reference to prevent circular references.
        """
        ob = StackPluginBase(stackWindow)
        return ob