67 lines
1.9 KiB
Rust
67 lines
1.9 KiB
Rust
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use std::cell::Ref;
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use std::cell::RefMut;
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use std::collections::HashMap;
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use std::rc::Rc;
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use downcast_rs::impl_downcast;
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use downcast_rs::Downcast;
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/// Styling for an element
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pub trait ElementStyle: Downcast + core::fmt::Debug {
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/// The style key
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fn key(&self) -> &'static str;
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/// Attempts to create a new style from a [`json`] string
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///
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/// # Errors
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///
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/// Will fail if deserialization fails
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fn from_json(&self, json: &str) -> Result<Rc<dyn ElementStyle>, String>;
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/// Serializes sytle into json string
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fn to_json(&self) -> String;
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}
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impl_downcast!(ElementStyle);
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pub trait StyleHolder {
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/// gets a reference to all defined styles
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fn styles(&self) -> Ref<'_, HashMap<String, Rc<dyn ElementStyle>>>;
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/// gets a (mutable) reference to all defined styles
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fn styles_mut(&self) -> RefMut<'_, HashMap<String, Rc<dyn ElementStyle>>>;
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/// Checks if a given style key is registered
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fn is_registered(&self, style_key: &str) -> bool {
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self.styles().contains_key(style_key)
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}
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/// Gets the current active style for an element
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/// NOTE: Will panic if a style is not defined for a given element
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/// If you need to process user input, use [`is_registered`]
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fn current_style(&self, style_key: &str) -> Rc<dyn ElementStyle> {
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self.styles().get(style_key).map(|rc| rc.clone()).unwrap()
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}
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/// Sets the [`style`]
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fn set_style(&self, style: Rc<dyn ElementStyle>) {
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self.styles_mut().insert(style.key().to_string(), style);
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}
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}
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#[macro_export]
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macro_rules! impl_elementstyle {
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($t:ty, $key:expr) => {
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impl ElementStyle for $t {
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fn key(&self) -> &'static str { $key }
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fn from_json(&self, json: &str) -> Result<std::rc::Rc<dyn ElementStyle>, String> {
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serde_json::from_str::<$t>(json)
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.map_err(|e| e.to_string())
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.map(|obj| std::rc::Rc::new(obj) as std::rc::Rc<dyn ElementStyle>)
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}
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fn to_json(&self) -> String { serde_json::to_string(self).unwrap() }
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}
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};
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}
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