Update doc for theme module

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Alexandre Bury 2018-01-20 21:13:30 -08:00
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//! Handle colors and themes in the UI.
//!
//! # Color palette
//! # Colors
//!
//! Characters can be printed in the terminal with a specific color.
//! The [`Color`] enum represents the ways this can be set.
//!
//! [`Color`]: enum.Color.html
//!
//! # Palette
//!
//! To achieve a customizable, yet unified look, Cursive uses a configurable
//! palette of colors to be used through the entire application.
//!
//! These colors are:
//! The [`PaletteColor`] enum defines possible entries in this palette.
//!
//! * **`background`**: used to color the application background
//! [`PaletteColor`]: enum.PaletteColor.html
//!
//! These entries are:
//!
//! * **`Background`**: used to color the application background
//! (around views).
//! Defaults to **blue**.
//! * **`shadow`**: used to color shadow around views.
//! * **`Shadow`**: used to color shadow around views.
//! Defaults to **black**.
//! * **`view`**: used to color the background for views.
//! * **`View`**: used to color the background for views.
//! Defaults to **white**.
//! * **`primary`**: used to print primary text.
//! * **`Primary`**: used to print primary text.
//! Defaults to **black**.
//! * **`secondary`**: used to print secondary text.
//! * **`Secondary`**: used to print secondary text.
//! Defaults to **blue**.
//! * **`tertiary`**: used to print tertiary text.
//! * **`Tertiary`**: used to print tertiary text.
//! Defaults to **white**.
//! * **`title_primary`**: used to print primary titles.
//! * **`TitlePrimary`**: used to print primary titles.
//! Defaults to **red**.
//! * **`title_secondary`**: used to print secondary titles.
//! * **`TitleSecondary`**: used to print secondary titles.
//! Defaults to **yellow**.
//! * **`highlight`**: used to highlight selected items.
//! * **`Highlight`**: used to highlight selected items.
//! Defaults to **red**.
//! * **`highlight_inactive`**: used to highlight selected but inactive items.
//! * **`HighlightInactive`**: used to highlight selected but inactive items.
//! Defaults to **blue**.
//!
//! A [`Palette`] then maps each of these to an actual [`Color`].
//!
//! [`Palette`]: struct.Palette.html
//! [`Color`]: enum.Color.html
//!
//! # Color Types
//!
//! When drawing views, color can be picked in two way:
//!
//! * An exact [`Color`] can be given directly
//! * A [`PaletteColor`] entry can be given, which will fetch whatever color
//! is currently defined for this.
//!
//! The [`ColorType`] enum abstract over these two choices.
//!
//! [`ColorType`]: enum.ColorType.html
//!
//! # Color Styles
//!
//! Each cell of the terminal uses two colors: *foreground* and *background*.
//! To actually print anything, two colors must be picked: one for the
//! foreground, and one for the background.
//!
//! Color styles are defined to easily refer to a pair of colors from the
//! palette.
//! As such, a [`ColorStyle`] is made of a pair of `ColorType`.
//!
//! * **`Background`**: style used to print the application background.
//! * Its *background* color is `background`.
//! Since some pairs are frequently used, `ColorStyle` defines some methods to
//! create these usual values:
//!
//! * **`ColorStyle::background()`**: style used to print the application background.
//! * Its *background* color is `Background`.
//! * Its *foreground* color is unimportant as no characters are ever
//! printed in the background.
//! * **`Shadow`**: style used to print shadows behind views.
//! * Its *background* color is `shadow`.
//! * **`ColorStyle::shadow()`**: style used to print shadows behind views.
//! * Its *background* color is `Shadow`.
//! * Here again, the *foreground* color is unimportant.
//! * **`Primary`**: style used to print primary text.
//! * Its *background* color is `view`.
//! * Its *foreground* color is `primary`.
//! * **`Secondary`**: style used to print secondary text.
//! * Its *background* color is `view`.
//! * Its *foreground* color is `secondary`.
//! * **`Tertiary`**: style used to print tertiary text.
//! * Its *background* color is `view`.
//! * Its *foreground* color is `tertiary`.
//! * **`TitlePrimary`**: style used to print titles.
//! * Its *background* color is `view`.
//! * Its *foreground* color is `title_primary`.
//! * **`TitleSecondary`**: style used to print secondary titles.
//! * Its *background* color is `view`.
//! * Its *foreground* color is `title_secondary`.
//! * **`Highlight`**: style used to print selected items.
//! * Its *background* color is `highlight`.
//! * Its *foreground* color is `view`.
//! * **`HighlightInactive`**: style used to print selected,
//! * **`ColorStyle::primary()`**: style used to print primary text.
//! * Its *background* color is `View`.
//! * Its *foreground* color is `Primary`.
//! * **`ColorStyle::secondary()`**: style used to print secondary text.
//! * Its *background* color is `View`.
//! * Its *foreground* color is `Secondary`.
//! * **`ColorStyle::tertiary()`**: style used to print tertiary text.
//! * Its *background* color is `View`.
//! * Its *foreground* color is `Tertiary`.
//! * **`ColorStyle::title_primary()`**: style used to print titles.
//! * Its *background* color is `View`.
//! * Its *foreground* color is `TitlePrimary`.
//! * **`ColorStyle::title_secondary()`**: style used to print secondary titles.
//! * Its *background* color is `View`.
//! * Its *foreground* color is `TitleSecondary`.
//! * **`ColorStyle::highlight()`**: style used to print selected items.
//! * Its *background* color is `Highlight`.
//! * Its *foreground* color is `View`.
//! * **`ColorStyle::highlight_inactive()`**: style used to print selected,
//! but inactive items.
//! * Its *background* color is `highlight_inactive`.
//! * Its *foreground* color is `view`.
//! * Its *background* color is `HighlightInactive`.
//! * Its *foreground* color is `View`.
//!
//! Using one of these pairs when styling your application helps give it a
//! coherent look.
//!
//! [`ColorStyle`]: struct.ColorStyle.html
//!
//! # Effects
//!
//! On top of a color style, some effects can be applied on cells: `Reverse`,
//! for instance, swaps the foreground and background colors of a cell.
//!
//! # Style
//!
//! Finally, a style combine a [`ColorType`] and a set of [`Effect`]s, to
//! represent any way text should be printed on screen.
//!
//! # Themes
//!
//! A theme defines the color palette an application will use, as well as