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40 lines
2.3 KiB
Markdown
40 lines
2.3 KiB
Markdown
# Themes
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A theme is a `Palette` (`ui/Theme.kt`): a dark background scale (`background`, `surface`,
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`surfaceVariant`, `line`, `line2`), two text colours, and the accent: `primary` / `signal`
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(flat accent, also Material's primary), `primary2` (the darker or second accent) and
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`onPrimary`. `PrimaryButton` and the launch flood already draw a gradient from `primary` to
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`primary2`. The choice is stored as an id (`SessionPrefs.theme`) and picked in Setup › Launcher.
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## Gradient theme
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`Themes.GRADIENT` is the one theme whose colours the person picks: a primary and a secondary,
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kept in `SessionPrefs.gradientColors` and in `Themes.gradientColors`, a Compose state, so a change
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restyles the whole app at once. `App.onCreate` loads the saved colours; code outside a composition
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uses `Themes.current(context)`.
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`ThemeColors.palette` builds the full palette from the two colours: primary becomes
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`primary` / `signal`, secondary becomes `primary2`, the background scale is a dark neutral tinted with
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the primary's hue (plain grey for a grey primary), and `onPrimary` is dark or white by the
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luminance of the pair. A colour too dark to show on the dark background is lifted
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(`ThemeColors.readable`) rather than refused.
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Setup shows Primary and Secondary under the theme when Gradient is chosen, each a small colour
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square. It opens `ColorPickerDialog`: a wheel (hue and saturation, touch), hue / saturation /
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brightness sliders (they work with a controller) and a hex box, with the old and new colour side by
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side. OK applies it.
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## Inner Gamer theme
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`Themes.INNER_GAMER` is an RGB theme: the accent walks round the colour wheel. It sits just above
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Gradient in the list, and Setup shows a Speed slider (1 to 10, `SessionPrefs.rgbSpeed`) under the
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theme while it is chosen.
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`Themes.innerGamer(hue)` builds the palette for one hue through `ThemeColors.palette`, so button text
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keeps the same contrast along the gradient at every hue. `DroidDeckTheme` runs one
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`rememberInfiniteTransition` while Inner Gamer is chosen, so the system's animation clock drives it.
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Compose applies Android's animator scale to it, and the colour holds still when animations are off
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in the app (`Motion.scale`) or in Android's own settings. The hue is written to `Themes.rgbHue` in 3° steps, which restyles the
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app only when the colour visibly moves; a slow cycle costs few recompositions.
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