doc/svghmi/pages.rst
author Edouard Tisserant <edouard.tisserant@gmail.com>
Fri, 05 Apr 2024 13:11:30 +0200
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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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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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.. image:: svghmi_relative.svg
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Jump and Back
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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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``HMI:Back`` takes no parameter and just go back one step in page change history.
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Special ``/CURRENTPAGE_N`` variable
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-----------------------------------
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..
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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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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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    TODO
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Fading
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    TODO