916 lines
26 KiB
Rust
916 lines
26 KiB
Rust
//! Pick lists display a dropdown list of selectable options.
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//!
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//! # Example
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//! ```no_run
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//! # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
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//! # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
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//! #
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//! use iced::widget::pick_list;
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//!
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//! struct State {
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//! favorite: Option<Fruit>,
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//! }
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//!
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//! #[derive(Debug, Clone, Copy, PartialEq, Eq)]
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//! enum Fruit {
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//! Apple,
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//! Orange,
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//! Strawberry,
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//! Tomato,
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//! }
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//!
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//! #[derive(Debug, Clone)]
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//! enum Message {
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//! FruitSelected(Fruit),
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//! }
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//!
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//! fn view(state: &State) -> Element<'_, Message> {
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//! let fruits = [
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//! Fruit::Apple,
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//! Fruit::Orange,
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//! Fruit::Strawberry,
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//! Fruit::Tomato,
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//! ];
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//!
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//! pick_list(
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//! fruits,
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//! state.favorite,
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//! Message::FruitSelected,
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//! )
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//! .placeholder("Select your favorite fruit...")
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//! .into()
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//! }
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//!
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//! fn update(state: &mut State, message: Message) {
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//! match message {
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//! Message::FruitSelected(fruit) => {
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//! state.favorite = Some(fruit);
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//! }
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//! }
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//! }
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//!
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//! impl std::fmt::Display for Fruit {
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//! fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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//! f.write_str(match self {
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//! Self::Apple => "Apple",
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//! Self::Orange => "Orange",
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//! Self::Strawberry => "Strawberry",
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//! Self::Tomato => "Tomato",
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//! })
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//! }
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//! }
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//! ```
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use crate::core::alignment;
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use crate::core::keyboard;
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use crate::core::layout;
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use crate::core::mouse;
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use crate::core::overlay;
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use crate::core::renderer;
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use crate::core::text::paragraph;
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use crate::core::text::{self, Text};
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use crate::core::touch;
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use crate::core::widget::tree::{self, Tree};
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use crate::core::window;
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use crate::core::{
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Background, Border, Clipboard, Color, Element, Event, Layout, Length,
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Padding, Pixels, Point, Rectangle, Shell, Size, Theme, Vector, Widget,
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};
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use crate::overlay::menu::{self, Menu};
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use std::borrow::Borrow;
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use std::f32;
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/// A widget for selecting a single value from a list of options.
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///
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/// # Example
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/// ```no_run
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/// # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
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/// # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
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/// #
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/// use iced::widget::pick_list;
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///
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/// struct State {
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/// favorite: Option<Fruit>,
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/// }
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///
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/// #[derive(Debug, Clone, Copy, PartialEq, Eq)]
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/// enum Fruit {
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/// Apple,
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/// Orange,
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/// Strawberry,
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/// Tomato,
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/// }
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///
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/// #[derive(Debug, Clone)]
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/// enum Message {
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/// FruitSelected(Fruit),
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/// }
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///
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/// fn view(state: &State) -> Element<'_, Message> {
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/// let fruits = [
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/// Fruit::Apple,
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/// Fruit::Orange,
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/// Fruit::Strawberry,
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/// Fruit::Tomato,
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/// ];
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///
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/// pick_list(
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/// fruits,
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/// state.favorite,
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/// Message::FruitSelected,
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/// )
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/// .placeholder("Select your favorite fruit...")
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/// .into()
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/// }
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///
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/// fn update(state: &mut State, message: Message) {
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/// match message {
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/// Message::FruitSelected(fruit) => {
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/// state.favorite = Some(fruit);
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/// }
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/// }
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/// }
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///
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/// impl std::fmt::Display for Fruit {
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/// fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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/// f.write_str(match self {
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/// Self::Apple => "Apple",
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/// Self::Orange => "Orange",
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/// Self::Strawberry => "Strawberry",
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/// Self::Tomato => "Tomato",
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/// })
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/// }
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/// }
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/// ```
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#[allow(missing_debug_implementations)]
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pub struct PickList<
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'a,
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T,
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L,
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V,
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Message,
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Theme = crate::Theme,
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Renderer = crate::Renderer,
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> where
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T: ToString + PartialEq + Clone,
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L: Borrow<[T]> + 'a,
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V: Borrow<T> + 'a,
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Theme: Catalog,
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Renderer: text::Renderer,
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{
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on_select: Box<dyn Fn(T) -> Message + 'a>,
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on_open: Option<Message>,
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on_close: Option<Message>,
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options: L,
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placeholder: Option<String>,
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selected: Option<V>,
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width: Length,
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padding: Padding,
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text_size: Option<Pixels>,
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text_line_height: text::LineHeight,
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text_shaping: text::Shaping,
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font: Option<Renderer::Font>,
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handle: Handle<Renderer::Font>,
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class: <Theme as Catalog>::Class<'a>,
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menu_class: <Theme as menu::Catalog>::Class<'a>,
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last_status: Option<Status>,
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}
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impl<'a, T, L, V, Message, Theme, Renderer>
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PickList<'a, T, L, V, Message, Theme, Renderer>
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where
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T: ToString + PartialEq + Clone,
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L: Borrow<[T]> + 'a,
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V: Borrow<T> + 'a,
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Message: Clone,
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Theme: Catalog,
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Renderer: text::Renderer,
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{
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/// Creates a new [`PickList`] with the given list of options, the current
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/// selected value, and the message to produce when an option is selected.
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pub fn new(
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options: L,
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selected: Option<V>,
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on_select: impl Fn(T) -> Message + 'a,
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) -> Self {
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Self {
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on_select: Box::new(on_select),
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on_open: None,
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on_close: None,
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options,
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placeholder: None,
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selected,
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width: Length::Shrink,
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padding: crate::button::DEFAULT_PADDING,
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text_size: None,
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text_line_height: text::LineHeight::default(),
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text_shaping: text::Shaping::default(),
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font: None,
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handle: Handle::default(),
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class: <Theme as Catalog>::default(),
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menu_class: <Theme as Catalog>::default_menu(),
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last_status: None,
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}
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}
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/// Sets the placeholder of the [`PickList`].
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pub fn placeholder(mut self, placeholder: impl Into<String>) -> Self {
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self.placeholder = Some(placeholder.into());
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self
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}
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/// Sets the width of the [`PickList`].
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pub fn width(mut self, width: impl Into<Length>) -> Self {
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self.width = width.into();
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self
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}
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/// Sets the [`Padding`] of the [`PickList`].
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pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
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self.padding = padding.into();
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self
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}
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/// Sets the text size of the [`PickList`].
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pub fn text_size(mut self, size: impl Into<Pixels>) -> Self {
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self.text_size = Some(size.into());
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self
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}
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/// Sets the text [`text::LineHeight`] of the [`PickList`].
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pub fn text_line_height(
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mut self,
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line_height: impl Into<text::LineHeight>,
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) -> Self {
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self.text_line_height = line_height.into();
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self
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}
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/// Sets the [`text::Shaping`] strategy of the [`PickList`].
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pub fn text_shaping(mut self, shaping: text::Shaping) -> Self {
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self.text_shaping = shaping;
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self
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}
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/// Sets the font of the [`PickList`].
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pub fn font(mut self, font: impl Into<Renderer::Font>) -> Self {
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self.font = Some(font.into());
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self
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}
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/// Sets the [`Handle`] of the [`PickList`].
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pub fn handle(mut self, handle: Handle<Renderer::Font>) -> Self {
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self.handle = handle;
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self
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}
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/// Sets the message that will be produced when the [`PickList`] is opened.
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pub fn on_open(mut self, on_open: Message) -> Self {
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self.on_open = Some(on_open);
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self
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}
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/// Sets the message that will be produced when the [`PickList`] is closed.
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pub fn on_close(mut self, on_close: Message) -> Self {
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self.on_close = Some(on_close);
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self
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}
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/// Sets the style of the [`PickList`].
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#[must_use]
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pub fn style(mut self, style: impl Fn(&Theme, Status) -> Style + 'a) -> Self
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where
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<Theme as Catalog>::Class<'a>: From<StyleFn<'a, Theme>>,
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{
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self.class = (Box::new(style) as StyleFn<'a, Theme>).into();
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self
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}
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/// Sets the style of the [`Menu`].
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#[must_use]
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pub fn menu_style(
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mut self,
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style: impl Fn(&Theme) -> menu::Style + 'a,
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) -> Self
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where
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<Theme as menu::Catalog>::Class<'a>: From<menu::StyleFn<'a, Theme>>,
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{
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self.menu_class = (Box::new(style) as menu::StyleFn<'a, Theme>).into();
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self
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}
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/// Sets the style class of the [`PickList`].
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#[cfg(feature = "advanced")]
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#[must_use]
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pub fn class(
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mut self,
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class: impl Into<<Theme as Catalog>::Class<'a>>,
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) -> Self {
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self.class = class.into();
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self
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}
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/// Sets the style class of the [`Menu`].
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#[cfg(feature = "advanced")]
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#[must_use]
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pub fn menu_class(
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mut self,
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class: impl Into<<Theme as menu::Catalog>::Class<'a>>,
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) -> Self {
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self.menu_class = class.into();
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self
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}
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}
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impl<'a, T, L, V, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
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for PickList<'a, T, L, V, Message, Theme, Renderer>
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where
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T: Clone + ToString + PartialEq + 'a,
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L: Borrow<[T]>,
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V: Borrow<T>,
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Message: Clone + 'a,
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Theme: Catalog + 'a,
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Renderer: text::Renderer + 'a,
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{
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fn tag(&self) -> tree::Tag {
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tree::Tag::of::<State<Renderer::Paragraph>>()
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}
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fn state(&self) -> tree::State {
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tree::State::new(State::<Renderer::Paragraph>::new())
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}
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fn size(&self) -> Size<Length> {
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Size {
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width: self.width,
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height: Length::Shrink,
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}
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}
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fn layout(
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&self,
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tree: &mut Tree,
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renderer: &Renderer,
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limits: &layout::Limits,
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) -> layout::Node {
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let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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let font = self.font.unwrap_or_else(|| renderer.default_font());
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let text_size =
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self.text_size.unwrap_or_else(|| renderer.default_size());
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let options = self.options.borrow();
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state.options.resize_with(options.len(), Default::default);
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let option_text = Text {
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content: "",
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bounds: Size::new(
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f32::INFINITY,
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self.text_line_height.to_absolute(text_size).into(),
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),
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size: text_size,
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line_height: self.text_line_height,
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font,
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align_x: text::Alignment::Default,
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align_y: alignment::Vertical::Center,
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shaping: self.text_shaping,
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wrapping: text::Wrapping::default(),
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};
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for (option, paragraph) in options.iter().zip(state.options.iter_mut())
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{
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let label = option.to_string();
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paragraph.update(Text {
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content: &label,
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..option_text
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});
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}
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if let Some(placeholder) = &self.placeholder {
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state.placeholder.update(Text {
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content: placeholder,
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..option_text
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});
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}
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let max_width = match self.width {
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Length::Shrink => {
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let labels_width =
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state.options.iter().fold(0.0, |width, paragraph| {
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f32::max(width, paragraph.min_width())
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});
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labels_width.max(
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self.placeholder
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.as_ref()
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.map(|_| state.placeholder.min_width())
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.unwrap_or(0.0),
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)
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}
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_ => 0.0,
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};
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let size = {
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let intrinsic = Size::new(
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max_width + text_size.0 + self.padding.left,
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f32::from(self.text_line_height.to_absolute(text_size)),
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);
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limits
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.width(self.width)
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.shrink(self.padding)
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.resolve(self.width, Length::Shrink, intrinsic)
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.expand(self.padding)
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};
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layout::Node::new(size)
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}
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fn update(
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&mut self,
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tree: &mut Tree,
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event: &Event,
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layout: Layout<'_>,
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cursor: mouse::Cursor,
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_renderer: &Renderer,
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_clipboard: &mut dyn Clipboard,
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shell: &mut Shell<'_, Message>,
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_viewport: &Rectangle,
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) {
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let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
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match event {
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Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
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| Event::Touch(touch::Event::FingerPressed { .. }) => {
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if state.is_open {
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// Event wasn't processed by overlay, so cursor was clicked either outside its
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// bounds or on the drop-down, either way we close the overlay.
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state.is_open = false;
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if let Some(on_close) = &self.on_close {
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shell.publish(on_close.clone());
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}
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shell.capture_event();
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} else if cursor.is_over(layout.bounds()) {
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let selected = self.selected.as_ref().map(Borrow::borrow);
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state.is_open = true;
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state.hovered_option = self
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.options
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.borrow()
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.iter()
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.position(|option| Some(option) == selected);
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if let Some(on_open) = &self.on_open {
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shell.publish(on_open.clone());
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}
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shell.capture_event();
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}
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}
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Event::Mouse(mouse::Event::WheelScrolled {
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delta: mouse::ScrollDelta::Lines { y, .. },
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}) => {
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if state.keyboard_modifiers.command()
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&& cursor.is_over(layout.bounds())
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&& !state.is_open
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{
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fn find_next<'a, T: PartialEq>(
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selected: &'a T,
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mut options: impl Iterator<Item = &'a T>,
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) -> Option<&'a T> {
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let _ = options.find(|&option| option == selected);
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options.next()
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}
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let options = self.options.borrow();
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let selected = self.selected.as_ref().map(Borrow::borrow);
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let next_option = if *y < 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter())
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} else {
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options.first()
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}
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} else if *y > 0.0 {
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if let Some(selected) = selected {
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find_next(selected, options.iter().rev())
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} else {
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options.last()
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}
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} else {
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None
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};
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if let Some(next_option) = next_option {
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shell.publish((self.on_select)(next_option.clone()));
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}
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shell.capture_event();
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}
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}
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Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
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state.keyboard_modifiers = *modifiers;
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}
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_ => {}
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};
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let status = {
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let is_hovered = cursor.is_over(layout.bounds());
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|
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if state.is_open {
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Status::Opened { is_hovered }
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} else if is_hovered {
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Status::Hovered
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} else {
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Status::Active
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}
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};
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|
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if let Event::Window(window::Event::RedrawRequested(_now)) = event {
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self.last_status = Some(status);
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} else if self
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.last_status
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.is_some_and(|last_status| last_status != status)
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{
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shell.request_redraw();
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}
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}
|
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|
|
fn mouse_interaction(
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|
&self,
|
|
_tree: &Tree,
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layout: Layout<'_>,
|
|
cursor: mouse::Cursor,
|
|
_viewport: &Rectangle,
|
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_renderer: &Renderer,
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) -> mouse::Interaction {
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let bounds = layout.bounds();
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|
let is_mouse_over = cursor.is_over(bounds);
|
|
|
|
if is_mouse_over {
|
|
mouse::Interaction::Pointer
|
|
} else {
|
|
mouse::Interaction::default()
|
|
}
|
|
}
|
|
|
|
fn draw(
|
|
&self,
|
|
tree: &Tree,
|
|
renderer: &mut Renderer,
|
|
theme: &Theme,
|
|
_style: &renderer::Style,
|
|
layout: Layout<'_>,
|
|
_cursor: mouse::Cursor,
|
|
viewport: &Rectangle,
|
|
) {
|
|
let font = self.font.unwrap_or_else(|| renderer.default_font());
|
|
let selected = self.selected.as_ref().map(Borrow::borrow);
|
|
let state = tree.state.downcast_ref::<State<Renderer::Paragraph>>();
|
|
|
|
let bounds = layout.bounds();
|
|
|
|
let style = Catalog::style(
|
|
theme,
|
|
&self.class,
|
|
self.last_status.unwrap_or(Status::Active),
|
|
);
|
|
|
|
renderer.fill_quad(
|
|
renderer::Quad {
|
|
bounds,
|
|
border: style.border,
|
|
..renderer::Quad::default()
|
|
},
|
|
style.background,
|
|
);
|
|
|
|
let handle = match &self.handle {
|
|
Handle::Arrow { size } => Some((
|
|
Renderer::ICON_FONT,
|
|
Renderer::ARROW_DOWN_ICON,
|
|
*size,
|
|
text::LineHeight::default(),
|
|
text::Shaping::Basic,
|
|
)),
|
|
Handle::Static(Icon {
|
|
font,
|
|
code_point,
|
|
size,
|
|
line_height,
|
|
shaping,
|
|
}) => Some((*font, *code_point, *size, *line_height, *shaping)),
|
|
Handle::Dynamic { open, closed } => {
|
|
if state.is_open {
|
|
Some((
|
|
open.font,
|
|
open.code_point,
|
|
open.size,
|
|
open.line_height,
|
|
open.shaping,
|
|
))
|
|
} else {
|
|
Some((
|
|
closed.font,
|
|
closed.code_point,
|
|
closed.size,
|
|
closed.line_height,
|
|
closed.shaping,
|
|
))
|
|
}
|
|
}
|
|
Handle::None => None,
|
|
};
|
|
|
|
if let Some((font, code_point, size, line_height, shaping)) = handle {
|
|
let size = size.unwrap_or_else(|| renderer.default_size());
|
|
|
|
renderer.fill_text(
|
|
Text {
|
|
content: code_point.to_string(),
|
|
size,
|
|
line_height,
|
|
font,
|
|
bounds: Size::new(
|
|
bounds.width,
|
|
f32::from(line_height.to_absolute(size)),
|
|
),
|
|
align_x: text::Alignment::Right,
|
|
align_y: alignment::Vertical::Center,
|
|
shaping,
|
|
wrapping: text::Wrapping::default(),
|
|
},
|
|
Point::new(
|
|
bounds.x + bounds.width - self.padding.right,
|
|
bounds.center_y(),
|
|
),
|
|
style.handle_color,
|
|
*viewport,
|
|
);
|
|
}
|
|
|
|
let label = selected.map(ToString::to_string);
|
|
|
|
if let Some(label) = label.or_else(|| self.placeholder.clone()) {
|
|
let text_size =
|
|
self.text_size.unwrap_or_else(|| renderer.default_size());
|
|
|
|
renderer.fill_text(
|
|
Text {
|
|
content: label,
|
|
size: text_size,
|
|
line_height: self.text_line_height,
|
|
font,
|
|
bounds: Size::new(
|
|
bounds.width - self.padding.horizontal(),
|
|
f32::from(self.text_line_height.to_absolute(text_size)),
|
|
),
|
|
align_x: text::Alignment::Default,
|
|
align_y: alignment::Vertical::Center,
|
|
shaping: self.text_shaping,
|
|
wrapping: text::Wrapping::default(),
|
|
},
|
|
Point::new(bounds.x + self.padding.left, bounds.center_y()),
|
|
if selected.is_some() {
|
|
style.text_color
|
|
} else {
|
|
style.placeholder_color
|
|
},
|
|
*viewport,
|
|
);
|
|
}
|
|
}
|
|
|
|
fn overlay<'b>(
|
|
&'b mut self,
|
|
tree: &'b mut Tree,
|
|
layout: Layout<'_>,
|
|
renderer: &Renderer,
|
|
translation: Vector,
|
|
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
|
|
let state = tree.state.downcast_mut::<State<Renderer::Paragraph>>();
|
|
let font = self.font.unwrap_or_else(|| renderer.default_font());
|
|
|
|
if state.is_open {
|
|
let bounds = layout.bounds();
|
|
|
|
let on_select = &self.on_select;
|
|
|
|
let mut menu = Menu::new(
|
|
&mut state.menu,
|
|
self.options.borrow(),
|
|
&mut state.hovered_option,
|
|
|option| {
|
|
state.is_open = false;
|
|
|
|
(on_select)(option)
|
|
},
|
|
None,
|
|
&self.menu_class,
|
|
)
|
|
.width(bounds.width)
|
|
.padding(self.padding)
|
|
.font(font)
|
|
.text_shaping(self.text_shaping);
|
|
|
|
if let Some(text_size) = self.text_size {
|
|
menu = menu.text_size(text_size);
|
|
}
|
|
|
|
Some(menu.overlay(layout.position() + translation, bounds.height))
|
|
} else {
|
|
None
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<'a, T, L, V, Message, Theme, Renderer>
|
|
From<PickList<'a, T, L, V, Message, Theme, Renderer>>
|
|
for Element<'a, Message, Theme, Renderer>
|
|
where
|
|
T: Clone + ToString + PartialEq + 'a,
|
|
L: Borrow<[T]> + 'a,
|
|
V: Borrow<T> + 'a,
|
|
Message: Clone + 'a,
|
|
Theme: Catalog + 'a,
|
|
Renderer: text::Renderer + 'a,
|
|
{
|
|
fn from(
|
|
pick_list: PickList<'a, T, L, V, Message, Theme, Renderer>,
|
|
) -> Self {
|
|
Self::new(pick_list)
|
|
}
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
struct State<P: text::Paragraph> {
|
|
menu: menu::State,
|
|
keyboard_modifiers: keyboard::Modifiers,
|
|
is_open: bool,
|
|
hovered_option: Option<usize>,
|
|
options: Vec<paragraph::Plain<P>>,
|
|
placeholder: paragraph::Plain<P>,
|
|
}
|
|
|
|
impl<P: text::Paragraph> State<P> {
|
|
/// Creates a new [`State`] for a [`PickList`].
|
|
fn new() -> Self {
|
|
Self {
|
|
menu: menu::State::default(),
|
|
keyboard_modifiers: keyboard::Modifiers::default(),
|
|
is_open: bool::default(),
|
|
hovered_option: Option::default(),
|
|
options: Vec::new(),
|
|
placeholder: paragraph::Plain::default(),
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<P: text::Paragraph> Default for State<P> {
|
|
fn default() -> Self {
|
|
Self::new()
|
|
}
|
|
}
|
|
|
|
/// The handle to the right side of the [`PickList`].
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
pub enum Handle<Font> {
|
|
/// Displays an arrow icon (▼).
|
|
///
|
|
/// This is the default.
|
|
Arrow {
|
|
/// Font size of the content.
|
|
size: Option<Pixels>,
|
|
},
|
|
/// A custom static handle.
|
|
Static(Icon<Font>),
|
|
/// A custom dynamic handle.
|
|
Dynamic {
|
|
/// The [`Icon`] used when [`PickList`] is closed.
|
|
closed: Icon<Font>,
|
|
/// The [`Icon`] used when [`PickList`] is open.
|
|
open: Icon<Font>,
|
|
},
|
|
/// No handle will be shown.
|
|
None,
|
|
}
|
|
|
|
impl<Font> Default for Handle<Font> {
|
|
fn default() -> Self {
|
|
Self::Arrow { size: None }
|
|
}
|
|
}
|
|
|
|
/// The icon of a [`Handle`].
|
|
#[derive(Debug, Clone, PartialEq)]
|
|
pub struct Icon<Font> {
|
|
/// Font that will be used to display the `code_point`,
|
|
pub font: Font,
|
|
/// The unicode code point that will be used as the icon.
|
|
pub code_point: char,
|
|
/// Font size of the content.
|
|
pub size: Option<Pixels>,
|
|
/// Line height of the content.
|
|
pub line_height: text::LineHeight,
|
|
/// The shaping strategy of the icon.
|
|
pub shaping: text::Shaping,
|
|
}
|
|
|
|
/// The possible status of a [`PickList`].
|
|
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
|
|
pub enum Status {
|
|
/// The [`PickList`] can be interacted with.
|
|
Active,
|
|
/// The [`PickList`] is being hovered.
|
|
Hovered,
|
|
/// The [`PickList`] is open.
|
|
Opened {
|
|
/// Whether the [`PickList`] is hovered, while open.
|
|
is_hovered: bool,
|
|
},
|
|
}
|
|
|
|
/// The appearance of a pick list.
|
|
#[derive(Debug, Clone, Copy, PartialEq)]
|
|
pub struct Style {
|
|
/// The text [`Color`] of the pick list.
|
|
pub text_color: Color,
|
|
/// The placeholder [`Color`] of the pick list.
|
|
pub placeholder_color: Color,
|
|
/// The handle [`Color`] of the pick list.
|
|
pub handle_color: Color,
|
|
/// The [`Background`] of the pick list.
|
|
pub background: Background,
|
|
/// The [`Border`] of the pick list.
|
|
pub border: Border,
|
|
}
|
|
|
|
/// The theme catalog of a [`PickList`].
|
|
pub trait Catalog: menu::Catalog {
|
|
/// The item class of the [`Catalog`].
|
|
type Class<'a>;
|
|
|
|
/// The default class produced by the [`Catalog`].
|
|
fn default<'a>() -> <Self as Catalog>::Class<'a>;
|
|
|
|
/// The default class for the menu of the [`PickList`].
|
|
fn default_menu<'a>() -> <Self as menu::Catalog>::Class<'a> {
|
|
<Self as menu::Catalog>::default()
|
|
}
|
|
|
|
/// The [`Style`] of a class with the given status.
|
|
fn style(
|
|
&self,
|
|
class: &<Self as Catalog>::Class<'_>,
|
|
status: Status,
|
|
) -> Style;
|
|
}
|
|
|
|
/// A styling function for a [`PickList`].
|
|
///
|
|
/// This is just a boxed closure: `Fn(&Theme, Status) -> Style`.
|
|
pub type StyleFn<'a, Theme> = Box<dyn Fn(&Theme, Status) -> Style + 'a>;
|
|
|
|
impl Catalog for Theme {
|
|
type Class<'a> = StyleFn<'a, Self>;
|
|
|
|
fn default<'a>() -> StyleFn<'a, Self> {
|
|
Box::new(default)
|
|
}
|
|
|
|
fn style(&self, class: &StyleFn<'_, Self>, status: Status) -> Style {
|
|
class(self, status)
|
|
}
|
|
}
|
|
|
|
/// The default style of the field of a [`PickList`].
|
|
pub fn default(theme: &Theme, status: Status) -> Style {
|
|
let palette = theme.extended_palette();
|
|
|
|
let active = Style {
|
|
text_color: palette.background.weak.text,
|
|
background: palette.background.weak.color.into(),
|
|
placeholder_color: palette.background.strong.color,
|
|
handle_color: palette.background.weak.text,
|
|
border: Border {
|
|
radius: 2.0.into(),
|
|
width: 1.0,
|
|
color: palette.background.strong.color,
|
|
},
|
|
};
|
|
|
|
match status {
|
|
Status::Active => active,
|
|
Status::Hovered | Status::Opened { .. } => Style {
|
|
border: Border {
|
|
color: palette.primary.strong.color,
|
|
..active.border
|
|
},
|
|
..active
|
|
},
|
|
}
|
|
}
|