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