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tomo-old/theme/theme.go

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package theme
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import "image"
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import "golang.org/x/image/font"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/canvas"
// IconSize is a type representing valid icon sizes.
type IconSize int
const (
IconSizeSmall IconSize = 16
IconSizeLarge IconSize = 48
)
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// Pattern lists a number of cannonical pattern types, each with its own ID.
// This allows custom elements to follow themes, even those that do not
// explicitly support them.
type Pattern int; const (
// PatternAccent is the accent color of the theme. It is safe to assume
// that this is, by default, a solid color.
PatternAccent Pattern = iota
// PatternBackground is the background color of the theme. It is safe to
// assume that this is, by default, a solid color.
PatternBackground
// PatternForeground is the foreground text color of the theme. It is
// safe to assume that this is, by default, a solid color.
PatternForeground
// PatternDead is a pattern that is displayed on a "dead area" where no
// controls exist, but there still must be some indication of visual
// structure (such as in the corner between two scroll bars).
PatternDead
// PatternRaised is a generic raised pattern.
PatternRaised
// PatternSunken is a generic sunken pattern.
PatternSunken
// PatternPinboard is similar to PatternSunken, but it is textured.
PatternPinboard
// PatternButton is a button pattern.
PatternButton
// PatternInput is a pattern for input fields, editable text areas, etc.
PatternInput
// PatternGutter is a track for things to slide on.
PatternGutter
// PatternHandle is a handle that slides along a gutter.
PatternHandle
)
// Theme represents a visual style configuration,
type Theme interface {
// FontFace returns the proper font for a given style, size, and case.
FontFace (FontStyle, FontSize, Case) font.Face
// Icon returns an appropriate icon given an icon name, size, and case.
Icon (string, IconSize, Case) canvas.Image
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// Pattern returns an appropriate pattern given a pattern name, case,
// and state.
Pattern (Pattern, PatternState, Case) artist.Pattern
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// Inset returns the area on all sides of a given pattern that is not
// meant to be drawn on.
Inset (Pattern, Case) Inset
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// Sink returns a vector that should be added to an element's inner
// content when it is pressed down (if applicable) to simulate a 3D
// sinking effect.
Sink (Pattern, Case) image.Point
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}
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// Wrapped wraps any theme and injects a case into it automatically so that it
// doesn't need to be specified for each query. Additionally, if the underlying
// theme is nil, it just uses the default theme instead.
type Wrapped struct {
Theme
Case
}
// FontFace returns the proper font for a given style and size.
func (wrapped Wrapped) FontFace (style FontStyle, size FontSize) font.Face {
real := wrapped.ensure()
return real.FontFace(style, size, wrapped.Case)
}
// Icon returns an appropriate icon given an icon name.
func (wrapped Wrapped) Icon (name string, size IconSize) canvas.Image {
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real := wrapped.ensure()
return real.Icon(name, size, wrapped.Case)
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}
// Pattern returns an appropriate pattern given a pattern name and state.
func (wrapped Wrapped) Pattern (id Pattern, state PatternState) artist.Pattern {
real := wrapped.ensure()
return real.Pattern(id, state, wrapped.Case)
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}
// Inset returns the area on all sides of a given pattern that is not meant to
// be drawn on.
func (wrapped Wrapped) Inset (id Pattern) Inset {
real := wrapped.ensure()
return real.Inset(id, wrapped.Case)
}
// Sink returns a vector that should be added to an element's inner content when
// it is pressed down (if applicable) to simulate a 3D sinking effect.
func (wrapped Wrapped) Sink (id Pattern) image.Point {
real := wrapped.ensure()
return real.Sink(id, wrapped.Case)
}
func (wrapped Wrapped) ensure () (real Theme) {
real = wrapped.Theme
if real == nil { real = Default { } }
return
}