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SelectList and Deck

A Deck Glyph, all by itself, is not very useful; the "top" child is displayed and there is no mechanism for telling the Deck to display a different child. To change what child, which Card of the Deck, is displayed, some other Glyph must be used to call the Deck's 'setCard(n)' method.

In this example, a SelectList will be wire to a Deck so that when the SelectList's selection is changed, the Deck's Card is changed.

A SelectList is not the only way to select which of a Deck's children to show. One could simply have a Button that, when clicked, cycles through the children. Or, have one Button per Deck's child where pressing Button 'n' would display child 'n'.

Here, the Deck will have four Text Objects as its children.

let t1 = forms#newText({'textlines': "Card\nOne"}) let t2 = forms#newText({'textlines': "Card\nTwo"}) let t3 = forms#newText({'textlines': "Card\nThree"}) let t4 = forms#newText({'textlines': "Card\nFour"})

Add the Text Objects to the Deck.

let deck = forms#newDeck({'children': [t1, t2, t3, t4]})

Define a function that takes the current SelectList position and uses that value to set the Deck's current Card:

function! SelectListToDeckFunc(...) dict let pos = a:1 call self.deck.setCard(pos) endfunction let action = forms#newAction({'execute': function("SelectListToDeckFunc")}) let action['deck'] = deck

Define the SelectList's attributes. Its 'mode' is 'single' meaning that only one item in the list can be selected at a time. The initial postion, 'pos', of the SelectList is '0'. The SelectList choices are name/id pairs where the names are displayed and the ids are a mechanism of creating a mapping to external data (which we do not use here). The 'size' is the size of the choice display window; all choices displayed at once since 'size' equals the number of 'choices'. Lastly, the 'on_selection_action' is set to the Action defined above:

let attrs = { 'mode': 'single', \ 'pos': 0, \ 'choices': [ \ ["one", 1], \ ["two", 2], \ ["three", 3], \ ["four", 4] \ ], 'size': 4, \ 'on_selection_action': action \ } let slist = forms#newSelectList(attrs)

To give a little space between the Deck and the SelectList, put the SelectList in a Boarder of size 1.

let b = forms#newBorder({'body': slist, 'char': ' '})

Put both the Deck and the Border into a HPoly.

let hpoly = forms#newHPoly({'children': [b, deck], 'alignment': 'C' })

Use a Background to highlight the region of the Form.

let bg = forms#newBackground({ 'body': hpoly})

The Background is now placed into the Form as its sole child Glyph, as the value of the Form Glyph's 'body' attribute:

let form = forms#newForm({'body': bg})

Then, the Form's 'run()' method is called:

call form.run()

This code is placed into a function:

function! forms#tutorial#selectlistdeck#Make()
  " SelectList and Deck code
endfunction

The full code for the SelectList and Deck can be found in: SelectList and Deck

To run the label code, source the selectlist_deck.vim file and then enter

:call forms#tutorial#selectlist_deck#Make()

on the command line.

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