[Qgis-developer] Reliable way to determine a groupIndex in the legend tree

[Etienne Tourigny]

On Fri, Oct 11, 2013 at 8:35 AM, Vincent Schut <schut at sarvision.nl> wrote:

> On 10/11/13 11:48, Sandro Santilli wrote:
>
>> On Fri, Oct 11, 2013 at 09:33:05AM +0000, Andreas Neumann wrote:
>>
>>> Am 11.10.2013 09:22, schrieb Sandro Santilli:
>>>
>>>> On Fri, Oct 11, 2013 at 09:13:03AM +0000, Duarte Carreira wrote:
>>>>
>>>>> The group checkbox, imho, should *not always* switch children on/off.
>>>>> You should have a modifier to get this as a secondary behavior, like
>>>>> pressing the ctrl key when (un)checking the group checkbox. The primary
>>>>> behavior of the group switch should be to make the children invisible or
>>>>> visible, regardless of the children's visibility being on or off.
>>>>>
>>>>> In the primary behavior when the parent is turned OFF, the children
>>>>> are not drawn but retain their checked or uncheck status.
>>>>> If you use the secondary behavior then unchecking the parent will
>>>>> uncheck the children. Same would apply when checking the parent on.
>>>>>
>>>>
>>>> Agreed, sounds like a sensible behavior to me.
>>>>
>>>>
>>> Yes, a sensible behavior.
>>>
>>> But there is still use-case for the radio-button like behaviour. Imagine
>>> having a group with a series of orthoimages of different years and you
>>> quickly want to see each year. In this case, the radio-button behaviour
>>> would save you one click. So I don't think that this contradicts the
>>> other proposal listed above here.
>>>
>>
>> Maybe this could be obtained with secondary behavior (SHIFT-click) on
>> layers,
>> but it sounds like something that easily becomes confusing (conflicting
>> with radio-on-groups, undefined behavior for unchecking etc.).
>>
>
> switching between several raster layers is exactly the main (only) use I
> have for this, and as we are mainly doing remote sensing stuff here,
> including lots of time series, it is something I really frequently miss.
> (Practical example: you have several Landsat rasters from different times
> for the same area, all of them have clouds but not in the same place. By
> switching between layers, you can easily get a 'cloudfree' view of the
> entire area.)
>

I have made the Loop Visible Layers plugin for just that. Add the reaster
layers you want to see in a group, then select that group in the Loop
Visible Layers dock and click play. You will see those raster layers one at
a time.

>
> IMHO 'undefined behavior for unchecking' should not be a problem; usually
> unchecking simply is disabled for radio groups. I do not know any UI with
> radio groups where you can uncheck a selected item by clicking it again...
> I think having it as a secondary behaviour is just confusing. I'd rather
> see groups have a 'selection type' property, which defines the selection
> behaviour within that group (and on that level only). Could you explain
> what you mean with 'conflicting with radio-on-groups' (what are
> 'radio-on-groups')?
>
>
> Vincent.
>
>
>
>> --strk;
>>
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