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http://jira.magnolia-cms.com/browse/MGNLUI-26?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Weder updated MGNLUI-26:
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Fix Version/s: 5.0 Alpha1 S9
(was: 5.0)
> Refine implementation of hybrid selection in lists and trees
> ------------------------------------------------------------
>
> Key: MGNLUI-26
> URL: http://jira.magnolia-cms.com/browse/MGNLUI-26
> Project: Magnolia UI
> Issue Type: Improvement
> Security Level: Public
> Reporter: Andreas Weder
> Priority: Major
> Fix For: 5.0 Alpha1 S9
>
>
> I'd like to refine our current implementation of hybrid selection in lists
> and trees first of all to complete the picture. I'd also like to address the
> issue of always ticking the check box. Some of what I'm describing here, has
> already been implemented. Please read and verify it all to ensure we get the
> concept right. Especially *important now* are the behavior when
> multi-selecting items using a modifier key, the behavior when starting a drag
> and the fact that we only toggle-select an item, once another one has been
> toggle-selected as well (see explanations below).
> Hybrid selection is *intuitive to use*, if done right, but unfortunately is
> *very hard and tedious to describe*. Please make sure you understand all of
> the following, before trying to implement any changes. Should this not be
> clear enough, please get back to me.
> To begin with, here's the two terms I use frequently below:
> * to _object-select_ an item, you click or tap anywhere in the row that
> represents the item. That's anywhere but in the column, where the checkbox is
> to toggle select the item. You may also object-select it by hitting the SPACE
> key on the keyboard while the keyboard focus is on that row.
> * if you _toggle-select_ an item, you tick its check box in order to select
> it.
> * hybrid selection is the term used to describe the combination of object
> with toggle selection to create a meaningful, consistent selection model with
> the best of both these worlds: object selection supports intuitive selection
> of single objects, toggle selection represents a visually clear way to
> multi-select items.
> Here's how I suggest we implement hybrid selection in our case:
> * to start off, you may select any item by either object-selecting or
> toggle-selecting it.
> * if you object-select an item while another item has already been
> object-selected, that item is first de-selected and the new one is then
> selected. *Object selection thus always de-selects all currently selected
> items first*, then selects the item you object selected. It clears the
> selection set and starts a new set containing only the item you
> object-selected.
> * if you toggle-select an item, any item that has already been selected
> previously - whether it has been object- or toggle-selected - gets
> toggle-selected as well. *Toggle selection thus adds the newly
> toggle-selected item to the set of already selected items*; it does NOT
> de-select any currently selected item or items.
> To take into account the results of some of the discussion we had, I'd *also
> like to make the following change*:
> * if you object-select an item, do not also toggle-select it.
> * if you then toggle-select another item, also toggle-select the first,
> previously only object-selected item.
> The last step is important to keep the interface consistent.
> To *de-select an item*:
> * un-tick its checkbox, if it has been ticked (and thus is member of a set of
> selected items)
> * if only a single item has been object-selected, simply object-select it
> again to de-select it
> So far so good. Things get hairy, since we can also *multi-select items using
> a modifier key*:
> * if you object-select multiple items using a modifier key (I think it's
> SHIFT by default in Vaadin), then all these objects get also toggle-selected
> in addition, if at least two items got selected like this.
> And they get even hairier, if we also include *drag and drop*. This is
> difficult, since the last item you mouse-down or touch-start on when you
> start the drag looks like it's being object-selected, but as a matter of
> fact, it is not:
> * when you start dragging a single or multiple items in a list or tree, the
> item you start the drag on/with, is first added to the list of already
> selected items, if any. It is object- and toggle-selected. The drag then
> starts with all those items, the previously selected one(s) as well as the
> one you've started the drag with.
> I'm not making this up, by the way. This is pretty much how things are
> described in UI design books such as the famous [Designing Web Interfaces by
> Bill Scott and Theresa Neil|http://is.gd/6uM2Bc].
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