66 lines
3.1 KiB
Factor
66 lines
3.1 KiB
Factor
USING: ui.gadgets help.markup help.syntax generic kernel
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classes.tuple quotations ui.gadgets.packs.private
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ui.baseline-alignment ;
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IN: ui.gadgets.packs
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ARTICLE: "ui-pack-layout" "Pack layouts"
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"Pack gadgets layout their children along a single axis."
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{ $subsections pack }
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"Creating empty packs:"
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{ $subsections
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<pack>
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<pile>
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<shelf>
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}
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"For more control, custom layouts can reuse portions of pack layout logic:"
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{ $subsections
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pack-pref-dim
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pack-layout
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} ;
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HELP: pack
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{ $class-description "A gadget which lays out its children along a single axis stored in the " { $snippet "orientation" } " slot. Can be constructed with one of the following words:"
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{ $list
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{ $link <pack> }
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{ $link <pile> }
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{ $link <shelf> }
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}
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"Packs have the following slots:"
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{ $list
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{ { $snippet "align" } " a rational number between 0 and 1, or " { $link +baseline+ } "; the alignment of gadgets along the axis perpendicular to the pack's orientation" }
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{ { $snippet "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" }
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{ { $snippet "gap" } " a pair of integers, the horizontal and vertical gap between children" }
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}
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"Custom gadgets can inherit from the " { $link pack } " class 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 } "." } ;
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HELP: pack-layout
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{ $values { "pack" "a new " { $link pack } } { "sizes" "a sequence of pairs of integers" } }
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{ $description "Lays out the pack's children along the " { $snippet "orientation" } " of the pack, with each gadget receiving its size from the corresponding index of the " { $snippet "sizes" } " sequence." }
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{ $notes
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"This word is useful if you are writing your own layout gadget which inherits from " { $link pack } ". This allows you to reuse layout logic while computing gadget sizes using a custom procedure."
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} ;
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HELP: <pack>
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{ $values { "orientation" "an orientation specifier" } { "pack" "a new " { $link pack } } }
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{ $description "Creates a new pack which lays out children with the given orientation, either " { $link horizontal } " or " { $link vertical } "." } ;
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{ <pack> <pile> <shelf> } related-words
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HELP: <pile>
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{ $values { "pack" "a new " { $link pack } } }
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{ $description "Creates a new " { $link pack } " which lays out its children vertically." } ;
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HELP: <shelf>
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{ $values { "pack" "a new " { $link pack } } }
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{ $description "Creates a new " { $link pack } " which lays out its children horizontally." } ;
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HELP: pack-pref-dim
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{ $values { "pack" pack } { "sizes" "a sequence of pairs of integers" } { "dim" "a pair of integers" } }
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{ $description "Computes the preferred size of a pack, with each gadget receiving its size from the corresponding index of the " { $snippet "sizes" } " sequence." }
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{ $notes
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"This word is useful if you are writing your own layout gadget which inherits from " { $link pack } ". This allows you to reuse layout logic while computing gadget sizes using a custom procedure."
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} ;
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ABOUT: "ui-pack-layout"
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