[Paraview-developers] Selecting blocks from drop down list

[Andy Bauer]

In ./ParaViewCore/ServerManager/SMApplication/Resources/filters.xml in the
source code there's the following  section which gives the options and GUI
layout:
    <SourceProxy class="vtkExtractBlock"
                 label="Extract Block"
                 name="ExtractBlock">
      <Documentation long_help="This filter extracts a range of blocks from
a multiblock dataset."
                     short_help="Extract block.">This filter extracts a
range
                     of groups from a multiblock dataset</Documentation>
      <InputProperty command="SetInputConnection"
                     name="Input">
        <ProxyGroupDomain name="groups">
          <Group name="sources" />
          <Group name="filters" />
        </ProxyGroupDomain>
        <DataTypeDomain name="input_type">
          <DataType value="vtkMultiBlockDataSet" />
        </DataTypeDomain>
        <Documentation>This property specifies the input to the Extract
Group
        filter.</Documentation>
      </InputProperty>
      <IntVectorProperty clean_command="RemoveAllIndices"
                         command="AddIndex"
                         name="BlockIndices"
                         number_of_elements_per_command="1"
                         panel_visibility="default"
                         repeat_command="1">
        <CompositeTreeDomain mode="all"
                             name="tree">
          <RequiredProperties>
            <Property function="Input"
                      name="Input" />
          </RequiredProperties>
        </CompositeTreeDomain>
        <Hints>
          <WidgetHeight number_of_rows="20" />
        </Hints>
        <Documentation>This property lists the ids of the blocks to extract
        from the input multiblock dataset.</Documentation>
      </IntVectorProperty>
      <IntVectorProperty command="SetPruneOutput"
                         default_values="1"
                         name="PruneOutput"
                         number_of_elements="1">
        <BooleanDomain name="bool" />
        <Documentation>When set, the output mutliblock dataset will be
pruned
        to remove empty nodes. On by default.</Documentation>
      </IntVectorProperty>
      <IntVectorProperty command="SetMaintainStructure"
                         default_values="0"
                         name="MaintainStructure"
                         number_of_elements="1">
        <BooleanDomain name="bool" />
        <Documentation>This is used only when PruneOutput is ON. By default,
        when pruning the output i.e. remove empty blocks, if node has only 1
        non-null child block, then that node is removed. To preserve these
        parent nodes, set this flag to true.</Documentation>
      </IntVectorProperty>
      <!-- End ExtractBlock -->
    </SourceProxy>

Creating something similar for you may work. If you search the code for
things like vtkSMIntVectorProperty.cxx/h you should find information on how
the corresponding IntVectorProperty.

On Fri, Jul 15, 2016 at 7:18 AM, Jorge Bañuls <jorgebanuls at gmail.com> wrote:

> Hi Andy,
>
> Indeed, the vtkExtractBlock filter is what I'm using in my script to
> extract the blocks, which are currently specified by the user in the
> properties panel as a string with the name of the block(s). Now that you
> mention it though, it could be useful to see how this filter creates the
> checklist. Is there a way to access the code behind this filter?
>
> Thanks a lot for your help,
>
> Jorge Bañuls
>
> On 15 July 2016 at 12:06, Andy Bauer <andy.bauer at kitware.com> wrote:
>
>> Have you looked at the Extract Blocks filter? That  may already be doing
>> what you need and if not, it at least shows how to check the boxes for
>> blocks that you want.
>>
>> On Fri, Jul 15, 2016 at 6:53 AM, Jorge Bañuls <jorgebanuls at gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I'm developing a filter for Paraview and I need to be able to select
>>> blocks from the properties panel (the input is a vtkMultiBlockDataSet). The
>>> approach I'm using right now is to write the name of the block(s) and then
>>> process that string within the script, but I would like to be able to check
>>> the blocks I need from a list. I've seen many examples of how to do this,
>>> but only for variables arrays (e.g. the list displays the cell arrays
>>> existing in the input). Any ideas on how to apply this to display and
>>> select the blocks?
>>>
>>> Thanks in advance for your help,
>>>
>>> Jorge Bañuls
>>>
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