37 lines
1.3 KiB
Factor
37 lines
1.3 KiB
Factor
IN: ui.gadgets.line-support
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USING: help.markup help.syntax ;
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ARTICLE: "ui.gadgets.line-support" "Gadget line support"
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"The " { $vocab-link "ui.gadgets.line-support" } " vocabulary provides common code shared by gadgets which display a sequence of lines of text. Currently, the two gadgets that use it are " { $link "ui.gadgets.editors" } " and " { $link "ui.gadgets.tables" } "."
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$nl
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"The class of line gadgets:"
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{ $subsections
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line-gadget
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line-gadget?
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}
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"Line gadgets are backed by a model which must be a sequence. The number of lines in the gadget is the length of the sequence."
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$nl
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"Line gadgets cannot be created and used directly, instead a subclass must be defined:"
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{ $subsections new-line-gadget }
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"Subclasses must implement a generic word:"
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{ $subsections draw-line }
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"Two optional generic words may be implemented; if they are not implemented in the subclass, a default implementation based on font metrics will be used:"
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{ $subsections
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line-height
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line-leading
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}
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"Validating line numbers:"
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{ $subsections validate-line }
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"Working with visible lines:"
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{ $subsections
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visible-lines
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first-visible-line
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last-visible-line
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}
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"Converting y co-ordinates to line numbers, and vice versa:"
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{ $subsections
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line>y
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y>line
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} ;
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ABOUT: "ui.gadgets.line-support" |