doc/svghmi/pages.rst
author Edouard Tisserant <edouard@beremiz.fr>
Wed, 10 Jul 2024 11:10:05 +0200
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MQTT: (WIP) Fix OpenSSL linking.
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Pages, Jumps and HMI_NODE relativity
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====================================
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Pages are full screen. Only one page is displayed at the same time.
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Page change is triggered by ``HMI:Jump`` and ``HMI:Back``, or by changing ``/CURRENTPAGE_N``.
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.. code-block:: text
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    HMI:Page:PageName[@RootPath]
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    HMI:Jump:PageName[@RelativePath]
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    HMI:Back
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Absolute and relative pages
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---------------------------
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When ``[@RootPath]`` is given, page is relative.
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When using ``HMI:Jump`` to reach a relative page, a compatible
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``[@RelativePath]`` may be provided.
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To be compatible, ``RootPath`` and ``RelativePath`` must both point to
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HMI tree nodes of type ``HMI_NODE`` instanciated from same POU.
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Every widget using a path descendant of ``RootPath`` in a relative
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page is relative. Relative widgets get the ``RootPath`` section of
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their path replaced by ``RelativePath``.
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Relative page label::
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    HMI:Page:PageName
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Absolute page label::
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    HMI:Page:PageName@RootPath
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Example::
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    HMI:Page:PumpControl@/PUMP0
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.. image:: svghmi_relative.svg
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Jumps
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-----
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``HMI:Jump`` can have ``inactive``, ``active`` and ``disabled`` labeled children:
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    * ``inactive`` is shown when target page is not currently displayed
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    * ``active`` is shown when target page is currently displayed
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    * ``disabled`` is shown when relative page's RootPath is set to 0, disabling jump.
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Relative page label::
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    HMI:Jump:PageName@RelativePath
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Absolute page label::
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    HMI:Jump:PageName
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Example::
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    HMI:Jump:PumpControl@/PUMP7
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Back: Jump to previous page
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----------------------------
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``HMI:Back`` takes no parameter and goes back one step in page change history when clicked.
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Special ``/CURRENT_PAGE_n`` variable
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-----------------------------------
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Each SVGHMI instance have its own ``/CURRENT_PAGE_n``, with ``n`` being the position of SVGHMI instance in Configuration Tree.
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By reading ``/CURRENT_PAGE_n`` value, PLC knows last page being displayed in HMI. Variable is of type STRING, and formatted as follows::
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    PageName
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    TODO
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Overlapping geometry
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If widget's bounding box is included in page bounding box, then widget is part of page.
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..
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    TODO
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Discarded element
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-----------------
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References frames
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References frames help to unclutter page and widgets.
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    TODO
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Screensaver
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-----------
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    TODO
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Fading
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..
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    TODO
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Go full screen
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1a0bed0b4f1c Doc: start converting Standard Library documentation from old MC8 manual.
Edouard Tisserant <edouard.tisserant@gmail.com>
parents: 3925
diff changeset
   123
..
1a0bed0b4f1c Doc: start converting Standard Library documentation from old MC8 manual.
Edouard Tisserant <edouard.tisserant@gmail.com>
parents: 3925
diff changeset
   124
    TODO