[Qgis-developer] Changing ergonomy of the visibility of layers inside groups ?

[Luigi Pirelli]

+1 would be a wonderful improvements, I agree with the three state
implementation.
Luigi Pirelli

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On 16 November 2016 at 14:44, Even Rouault <even.rouault at spatialys.com> wrote:
>> Another scenario would be:
>>
>> When clicking, the group toggle between unchecked, partially checked,
>> checked. At the same time it caches the state for all subitems to
>> restore the partially checked state when switching to this.
>>
>> At any time, when a subitems check state is changed, all parents
>> invalidate their cached states and override it with the new partial
>> check state. If the last remaining unchecked item is checked (and vice
>> versa) clicking the group skips the partially checked state...
>>
>> Maybe that would be more natural?
>
> So imagine you have an initial state with a group G checked and its layers A
> and B checked
> You click on G ==> it becomes unchecked, and A and B as well
> You click on G ==> it becomes checked, and A and B as well
> You click on A to unselect it ==> G becomes partially checked. And you save
> current state of A and B as StatePartial
> You click on G ==> it becomes checked, and A and B as well
> You click on G ==> it becomes unchecked, and A and B as well
> You click on G ==> it becomes partially checked, and you restore StatePartial
> (ie A is unchecked and B is checked)
> You check on A ==> it becomes checked and G as well (and clicking on G would
> switch between all on - all off)
> You uncheck A --> G becomes partially checked
> You uncheck B --> G becomes unchecked  (and clicking on G would switch between
> all on - all off)
>
> Is that what you meant ? That makes sense to me.
> Besides a slightly more complicated implementation, one downside would be that
> cycling between (partially)on state and off state of a group (with different
> check state of its items) would require 1.5 clicks on average (1 click to go
> from unchecked to partially checked, 2 from partially checked to unchecked)
> instead of 1. I should check with the users if they can afford the extra half
> click :-)
>
> Thanks for your suggestions.
>
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> Spatialys - Geospatial professional services
> http://www.spatialys.com
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