[Paraview] The flow process for paraview and interaction between QT and VTK parts

[Moreland, Kenneth]

There are two main layers that deal with moving values from Qt components to the underlying VTK objects.  The first layer is the server manager layer, which is controlled through the proxies that Dave mentions below.  The server manager layer is documented in Chapter 18 of The ParaView Guide.

There are different mechanisms for going from Qt components to server manager proxies.  Most of the GUI components under the Object Inspector/Properties tab are managed by the pqPropertyManager class.  This class records changes in Qt GUI components, pushes the changes to the server manager when apply is hit, and creates entries for the undo/redo stack.  The pqPropertyManager class is usually set up by methods in the pqNamedWidgets class.  These methods will attach QWidgets to server manager properties with the same name.  It can also automatically create Qt Widgets based on the properties in a server manager proxy.

-Ken


On 3/11/09 6:45 AM, "David E DeMarle" <dave.demarle at kitware.com> wrote:

vtk objects are all controlled through vtkSMProxies. This indirection
allows the client application to control vtk objects that exist in
remote (often parallel) processes as easily as it controls vtk objects
that exist within the same process.

The QT client application controls vtkSMProxies with the help of
pqProxy class. This class helps with vtk event to qt signal slot
translation.

There is more to the story than just the above. Perhaps Utkarsh, Berk
or some of the developers from ETI will add more detail.

On Wed, Mar 11, 2009 at 12:04 AM, #CHENG ZHIGAO# <CHEN0136 at ntu.edu.sg> wrote:
>
> Dear developers,
>
>       I am sorry to trouble you.     I am currently involved in a project
> which needs to use paraview or even add some my own stuffs.  As a beginner,
> i wish i could understand how the paraview works after starting up.  How the
> QT part initialized and set up, especially the parts involved with VTK and
> QT.  For example, if i create a sphere and do some subsequent filt
> operation, how does the QT part interact with the VTK parts?  And how do
> they keep synchronized with each other?    I do wish i can get the answer
> from you people since it is really hard to find the answer somewhere else.
>
>       Thanks very much and i really appreciate if any help provided.
>
> Best Regards,
> zhigao
>
>
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--
David E DeMarle
Kitware, Inc.
R&D Engineer
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   ****      Kenneth Moreland
    ***      Sandia National Laboratories
***********
*** *** ***  email: kmorel at sandia.gov
**  ***  **  phone: (505) 844-8919
    ***      web:   http://www.cs.unm.edu/~kmorel

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