USING: ui.gadgets help.markup help.syntax generic kernel
classes.tuple quotations ;
IN: ui.gadgets.packs

HELP: pack
{ $class-description "A gadget which lays out its children along a single axis stored in the " { $link gadget-orientation } " slot. Can be constructed with one of the following words:"
{ $list
    { $link <pack> }
    { $link <pile> }
    { $link <shelf> }
    { $link make-pile }
    { $link make-filled-pile }
    { $link make-shelf }
}
"Packs have the following slots:"
{ $list
    { { $link pack-align } " a rational number between 0 and 1, the alignment of gadgets along the axis perpendicular to the pack's orientation" }
    { { $link pack-fill } " a rational number between 0 and 1, where 0 gives each gadget its preferred size and 1 fills the dimension perpendicular to the pack's orientation" }
    { { $link pack-gap } " a pair of integers, the horizontal and vertical gap between children" }
}
"Gadgets can delegate to packs and implement their own " { $link pref-dim* } " and " { $link layout* } " methods, reusing pack layout logic by calling " { $link pack-pref-dim } " and " { $link pack-layout } "." } ;

HELP: pack-layout
{ $values { "pack" "a new " { $link pack } } { "sizes" "a sequence of pairs of integers" } }
{ $description "Lays out the pack's children along the " { $link gadget-orientation } " of the pack, with each gadget receiving its size from the corresponding index of the " { $snippet "sizes" } " sequence." }
{ $notes
    "This word is useful if you are writing your own layout gadget which delegates to a " { $link pack } ". This allows you to reuse layout logic while computing gadget sizes using a custom procedure."
} ;

HELP: <pack>
{ $values { "orientation" "an orientation specifier" } { "pack" "a new " { $link pack } } }
{ $description "Creates a new pack which lays out children along the given axis. Children are laid out vertically if the orientation is " { $snippet "{ 0 1 }" } " and horizontally if the orientation is " { $snippet "{ 1 0 }" } "." } ;

{ <pack> <pile> <shelf> } related-words

HELP: <pile>
{ $values { "pack" "a new " { $link pack } } }
{ $description "Creates a new " { $link pack } " which lays out its children vertically." } ;

HELP: <shelf>
{ $values { "pack" "a new " { $link pack } } }
{ $description "Creates a new " { $link pack } " which lays out its children horizontally." } ;

HELP: pack-pref-dim
{ $values { "gadget" gadget } { "sizes" "a sequence of pairs of integers" } { "dim" "a pair of integers" } }
{ $description "Computes the preferred size of a pack, with each gadget receiving its size from the corresponding index of the " { $snippet "sizes" } " sequence." }
{ $notes
    "This word is useful if you are writing your own layout gadget which delegates to a " { $link pack } ". This allows you to reuse layout logic while computing gadget sizes using a custom procedure."
} ;

HELP: make-pile
{ $values { "quot" quotation } { "pack" "a new " { $link pack } } }
{ $description "Creates a new " { $link pack } " which lays out a sequence of gadgets vertically. The quotation can add children by calling the " { $link gadget, } " word." } ;

HELP: make-filled-pile
{ $values { "quot" quotation } { "pack" "a new " { $link pack } } }
{ $description "Creates a new " { $link pack } " which lays out a sequence of gadgets vertically, such that all gadgets have the same width. The quotation can add children by calling the " { $link gadget, } " word." } ;

HELP: make-shelf
{ $values { "quot" quotation } { "pack" "a new " { $link pack } } }
{ $description "Creates a new " { $link pack } " which lays out a sequence of gadgets horizontally. The quotation can add children by calling the " { $link gadget, } " word." } ;