71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
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package style
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import "image/color"
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import "git.tebibyte.media/tomo/tomo"
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// Style can apply a visual style to different objects.
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type Style struct {
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// Rules determines which styles get applied to which Objects.
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Rules []Rule
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// Colors maps tomo.Color values to color.RGBA values.
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Colors map[tomo.Color] color.Color
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}
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// Rule describes under what circumstances should certain style attributes be
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// active.
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type Rule struct {
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Role tomo.Role
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Tags []string
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Set AttrSet
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}
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// Ru is shorthand for creating a rule structure
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func Ru (set AttrSet, role tomo.Role, tags ...string) Rule {
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return Rule {
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Role: role,
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Tags: tags,
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Set: set,
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}
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}
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// AttrSet is a set of attributes wherein only one/zero of each attribute type
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// can exist. It is keyed by the AttrKind of each attribute and must not be
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// modified directly.
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type AttrSet map[tomo.AttrKind] tomo.Attr
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// AS builds an AttrSet out of a vararg list of Attr values. If multiple Attrs
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// of the same kind are specified, the last one will override the others.
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func AS (attrs ...tomo.Attr) AttrSet {
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set := AttrSet { }
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set.Add(attrs...)
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return set
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}
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// Add adds attributes to the set.
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func (this AttrSet) Add (attrs ...tomo.Attr) {
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for _, attr := range attrs {
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this[attr.Kind()] = attr
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}
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}
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// MergeUnder takes attributes from another set and adds them if they don't
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// already exist in this one.
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func (this AttrSet) MergeUnder (other AttrSet) {
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if other == nil { return }
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for _, attr := range other {
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if _, exists := this[attr.Kind()]; !exists {
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this.Add(attr)
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}
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}
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}
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// MergeOver takes attributes from another set and adds them, overriding this
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// one.
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func (this AttrSet) MergeOver (other AttrSet) {
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if other == nil { return }
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for _, attr := range other {
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this.Add(attr)
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}
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}
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