[Qgis-developer] index in self.legend.groupLayerRelationship - different behavior between QGIS 1.8 and master?

[Massimo]

Etienne Tourigny-3 wrote
> .....
> While it woulf be good to expose legend api to python, it mught be a
> lot of work.

Yes it could be a lot of work and I'm not sure about how to do it.


Etienne Tourigny-3 wrote
> would it be sufficient to have the following?
> 
> 1) groups relations like this:
> QList< QPair< int, QList < int > > >
> 
> 2) layers within a group like this:
> QList< QPair< int, QList< QString > > >
> or
> QList< QPair< int, QList< QgsMapLayer* > > >
> 
> this way, you have access to group hierarchies by id, and layers for each
> group.
> 
> You would use existing methods like setGroupExpanded() to work on
> groups in a relatively simple manner.

Using the index instead of group name is a good idea. Anyway, the groups
relations could be recursive in order to avoid a "complex" algorithm to
reconstruct the hierarchy.
Furthermore splitting the information over two lists cuts off the exact
sequence of layers/groups and any post processing logic will fail to
reconstruct  the hierarchy.

Thus I propose another solution based on QDomDocument similar to the one
adopted into the QgsLegend::writeProject method.
The returned document will contain only groups and layers names and indexes,
like the following example:
<!DOCTYPE Group Layer Hierarchy>
<Legend>
 <Group Name="G0" Index="0">
  <Layer GroupIndex="0" Id="L020120904162647883" Name="L0" Index="0"/>
  <Group Name="G1" Index="1">
   <Group Name="G2" Index="2">
    <Layer GroupIndex="2" Id="L120120904162647883" Name="L1" Index="1"/>
    <Layer GroupIndex="2" Id="L220120904162647382" Name="L2" Index="2"/>
    <Layer GroupIndex="2" Id="L320120904162644097" Name="L3" Index="3"/>
   </Group>
   <Group Name="G3" Index="3">
    <Layer GroupIndex="3" Id="L40120904162648624" Name="L4" Index="4"/>
   </Group>
   <Group Name="G4" Index="4">
    <Layer GroupIndex="4" Id="L520120904162649445" Name="L5" Index="5"/>
   </Group>
  </Group>
 </Group>
</Legend>

Massimo





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