.. DO NOT EDIT.
.. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY.
.. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE:
.. "11_demos\itom\ui\demo_algoCancelAndProgressWidget.py"
.. LINE NUMBERS ARE GIVEN BELOW.

.. only:: html

    .. note::
        :class: sphx-glr-download-link-note

        :ref:`Go to the end <sphx_glr_download_11_demos_itom_ui_demo_algoCancelAndProgressWidget.py>`
        to download the full example code.

.. rst-class:: sphx-glr-example-title

.. _sphx_glr_11_demos_itom_ui_demo_algoCancelAndProgressWidget.py:

Algorithm cancel and progress widget
=======================================

This script shows how the ``itom.progressObserver`` is used
to observe and report the progress of functions.

.. GENERATED FROM PYTHON SOURCE LINES 7-71







.. code-block:: Python


    from itomUi import (
        ItomUi,
    )  # import the base class ItomUi from the module itomUi in the itom-packages subfolder
    from itom import ui
    from itom import uiItem
    from itom import progressObserver
    from contextlib import contextmanager
    from typing import Dict


    class AlgoCancelAndProgressWidget(ItomUi):
        def __init__(self):  # constructor
            # call constructor of ItomUi like it would be the constructor of the class itom.ui:
            ItomUi.__init__(self, "algoCancelAndProgressWidget.ui", ui.TYPEWINDOW)

            self.observer = progressObserver(
                progressBar=self.gui.progressBar,
                label=self.gui.lblProgress,
                progressMinimum=0,
                progressMaximum=100,
            )

            self.gui.btnCancel["visible"] = False
            self.gui.lblProgress["visible"] = False
            self.gui.progressBar["visible"] = False
            self.gui.btnCancel.invokeProgressObserverCancellation(
                "clicked()", self.observer
            )

        @ItomUi.autoslot("")
        def on_btnStart_clicked(self):
            with self.disableGui(
                {
                    self.gui.btnStart: False,
                    self.gui.btnCancel: True,
                    self.gui.lblProgress: True,
                    self.gui.progressBar: True,
                }
            ):
                # the following filter must have the ability to provide status information (see information of filter)
                filter("demoCancellationFunction", _observer=self.observer)

        @contextmanager
        def disableGui(self, widgets: Dict[uiItem, bool]):
            """this is a smart helper method that can be used in a with context.
            It changes the visible property when entering the with context for
            all given uiItems to the given boolean value, then executes the content
            of the with statement, and finally switches the visible properties back
            to the origin.The switch back is executed even if an exception (cancellation
            of the algorithm etc.) occurred.
            """
            for w in widgets:
                w["visible"] = widgets[w]
            try:
                yield
            finally:
                for w in widgets:
                    w["visible"] = not widgets[w]


    # create a first instance of AlgoCancelAndProgressWidget and the gui
    win1 = AlgoCancelAndProgressWidget()
    win1.gui.show()  # show the gui


.. rst-class:: sphx-glr-timing

   **Total running time of the script:** (0 minutes 0.044 seconds)


.. _sphx_glr_download_11_demos_itom_ui_demo_algoCancelAndProgressWidget.py:

.. only:: html

  .. container:: sphx-glr-footer sphx-glr-footer-example

    .. container:: sphx-glr-download sphx-glr-download-jupyter

      :download:`Download Jupyter notebook: demo_algoCancelAndProgressWidget.ipynb <demo_algoCancelAndProgressWidget.ipynb>`

    .. container:: sphx-glr-download sphx-glr-download-python

      :download:`Download Python source code: demo_algoCancelAndProgressWidget.py <demo_algoCancelAndProgressWidget.py>`

    .. container:: sphx-glr-download sphx-glr-download-zip

      :download:`Download zipped: demo_algoCancelAndProgressWidget.zip <demo_algoCancelAndProgressWidget.zip>`