New dialog to select multiple items using checkboxes

[carolahp]

The new dialog is displayed below.
Its api is the same as SpSelectDialog.
Three examples were added.

This presenter is used in Pharo PR#16637

[demarey]

This presenter is nice but it looks to be a duplicate of SpChooserPresenter.
The new dialog also misses a filter for items.

[carolahp]

@demarey I think the SpChooserPresenter is designed to selecting items from a long lists (as in the image), while the presenter I propose works best for a short list of items.

You are right that my presenter is missing a filter. I can add it

[demarey]

Hi @carolahp
I agree your presenter is better for a few items but I still think the same presenter can do both jobs:

• present a logn list of items to select: SpChooserPresenter
• present a short list of items to select: SpSelectMultipleDialog
  I think SpChooserPresenter could have 2 different layouts for both usage:
• one showing twol list,
• the other only showing one list.
  Could you have a look at SpChooserPresenter to see if it is doable. The only hard point I can see is the different behaviour when selecting items from the first list but maybe I miss something.

[carolahp]

Hi @demarey
Modifying SpChoosedPresenter to do both jobs would implies:

• Modifying the logic behind the way chosenItems are computed and displayed. When the items list is short the chosen items are the checked items in the first list, but when the items list is long the chosen items are those in the second list. I can't think of a clean way to introduce this distinction in the code, but to add many ifs
  Maybe it's just me who can't find an elegant way to implement this new behavior to SpChooserPresenter. Could you please give me your opinion?