class

Tryst::Theme

Reads the ACTIVE ttk theme's colors, so an owner-drawn widget doesn't hardcode colors that clash with aqua/clam/dark - the piece every ad-hoc canvas widget skips and then looks wrong on one platform (see OwnerDrawnWidget's own doc comment). Nothing else in this codebase reads a ttk style color before this - every existing ttk::style call elsewhere is a configure (write), never a lookup (read).

Two steps because ttk itself only deals in color NAMES, not numbers: ttk::style lookup hands back a symbolic system color on aqua (e.g. "systemWindowBackgroundColor") but a literal hex string on most other themes (e.g. "#dcdad5" on clam) - confirmed directly against both, not assumed. #rgb resolves whichever kind Tk handed back into actual 8-bit channels via winfo rgb, which accepts both forms uniformly.

Constructors

new(app : App)

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Instance methods

accent(style : String = ".") : Tuple(UInt8, UInt8, UInt8)

The theme's own selection/highlight color - the closest thing ttk has to a single "accent" color, used the same way a selected list row or a focused entry's border already draws with it.

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background(style : String = ".") : Tuple(UInt8, UInt8, UInt8)

The current window/widget background, e.g. what an owner-drawn widget's own canvas should clear to so it doesn't stand out as a different color than its surroundings.

Source

background_name(style : String = ".") : String

The raw Tk colour name/hex string, for another widget's own -background option - skips #background's RGB round-trip, which loses precision winfo rgb's 16-bit -> 8-bit downscale can round away.

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color(style : String, option : String, default : String) : Tuple(UInt8, UInt8, UInt8)

A raw ttk style option, resolved to 8-bit RGB. Falls back to default (any real Tk color name or hex string) if the active theme has no answer for option on style - confirmed directly that an unrecognized option returns empty rather than raising, so this always needs a caller-supplied fallback to stay meaningful.

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foreground(style : String = ".") : Tuple(UInt8, UInt8, UInt8)

The current text/foreground color.

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rgb(color_name : String) : Tuple(UInt8, UInt8, UInt8)

Resolves any Tk color name (symbolic like "systemWindowBackgroundColor" or literal like "#dcdad5") to 8-bit RGB. winfo rgb itself always answers in 16-bit-per-channel values (0-65535), hence the //257 (65535/255) downscale - the window argument only matters for a window-specific palette (8-bit displays), never for the truecolor case every platform this project targets actually has, so "." is always fine regardless of which style the color came from.

Source