marcel 0.1.1

Dynamic theme library for the iced GUI framework
Documentation 
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//! Button theme.



pub(crate) mod serial;



use crate::{ Border, Color, Theme };

use iced_native::{
    widget::{
        scrollable::{
            StyleSheet,

            style::{
                Scrollbar, Scroller,
            },
        },
    },
};

use serial::Component;


#[derive(Clone, Copy, Debug)]
pub struct Scrollable {
    /// State Themes of the scrollable.
    /// In order: active, hovered, dragging.
    pub state: [State; 3]
}

impl Scrollable {
    /// Attempts to create a theme from its serialized version.
    pub(crate) fn create(serial: &serial::Scrollable, theme: &Theme) -> Result<Self, ()> {
        // Get all the themes.
        let active   = Self::state( &serial.active  , theme, 0 )?;
        let hovered  = Self::state( &serial.hovered , theme, 1 )?;
        let dragging = Self::state( &serial.dragging, theme, 2 )?;
        
        // Find the first state theme that is not None.
        let default = match (active, hovered, dragging) {
            (Some(d), _, _) => d,
            (_, Some(d), _) => d,
            (_, _, Some(d)) => d,

            _ => return Err(()),
        };

        Ok(Scrollable {
            state: [
                if active.is_some()   { active.unwrap()   } else { default },
                if hovered.is_some()  { hovered.unwrap()  } else { default },
                if dragging.is_some() { dragging.unwrap() } else { default },
            ],
        })
    }

    fn state(serial: &Component, theme: &Theme, index: usize) -> Result<Option<State>, ()> {
        match serial {
            Component::Defined( state ) => Ok( Some( State::from(&state, &theme)? ) ),

            Component::Inherited( name ) => match theme.scrollable.get( name ) {
                Some( scrollable ) => Ok( Some( scrollable.state[index].clone() ) ),
                _ => Err(()),
            },

            Component::None => Ok( None ),
        }
    }
}

impl StyleSheet for Scrollable {
    type Style = iced::Theme;

    fn active(&self, _: &Self::Style) -> Scrollbar {
        Scrollbar {
            background: Some( self.state[0].color.into() ),
            border_radius: self.state[0].border.radius,
            border_width: self.state[0].border.width,
            border_color: self.state[0].border.color.into(),

            scroller: Scroller {
                color: self.state[0].scolor.into(),
                border_radius: self.state[0].sborder.radius,
                border_width: self.state[0].sborder.width,
                border_color: self.state[0].sborder.color.into(),
            }
        }
    }

    fn hovered(&self, _: &Self::Style) -> Scrollbar {
        Scrollbar {
            background: Some( self.state[1].color.into() ),
            border_radius: self.state[1].border.radius,
            border_width: self.state[1].border.width,
            border_color: self.state[1].border.color.into(),

            scroller: Scroller {
                color: self.state[1].scolor.into(),
                border_radius: self.state[1].sborder.radius,
                border_width: self.state[1].sborder.width,
                border_color: self.state[1].sborder.color.into(),
            }
        }
    }
}



#[derive(Clone, Copy, Debug)]
pub struct State {
    /// Background color.
    pub color: Color,

    /// Border theme.
    pub border: Border,

    /// Scroller color.
    pub scolor: Color,

    /// Scroller border theme.
    pub sborder: Border,
}

impl State {
    /// Attempts to create a theme from its serialized version.
    fn from(serial: &serial::State, theme: &Theme) -> Result<Self, ()> {
        // Get the scrollable color.
        let color = match theme.color.get(&serial.color) {
            Some(color) => *color,
            _ => return Err(()),
        };

        // Get the scrollable border.
        let border = match theme.border.get(&serial.border) {
            Some(border) => *border,
            _ => return Err(()),
        };

        // Get the scroller color.
        let scolor = match theme.color.get(&serial.scolor) {
            Some(color) => *color,
            _ => return Err(()),
        };

        // Get the scroller border.
        let sborder = match theme.border.get(&serial.sborder) {
            Some(border) => *border,
            _ => return Err(()),
        };

        Ok( State { color, border, scolor, sborder } )
    }
}