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use std::{borrow::Cow, path::PathBuf, sync::Arc};
use crate::{
error::{Error, Result},
icon::{Icon, IconThemes},
search_paths::SearchPaths,
theme_name_provider::ThemeNameProvider,
};
use dashmap::DashMap;
#[derive(Debug)]
pub struct IconLoader {
theme_name: String,
fallback_theme_name: String,
theme_cache: DashMap<String, Arc<IconThemes>>,
icon_cache: DashMap<String, Option<Arc<Icon>>>,
search_paths: SearchPaths,
theme_name_provider: ThemeNameProvider,
}
impl IconLoader {
pub fn new() -> Self {
IconLoader {
theme_name: String::from("hicolor"),
fallback_theme_name: String::from("hicolor"),
theme_name_provider: ThemeNameProvider::User(String::from("hicolor")),
theme_cache: Default::default(),
icon_cache: Default::default(),
search_paths: SearchPaths::System,
}
}
pub fn load_icon(&self, icon_name: impl AsRef<str>) -> Result<Arc<Icon>> {
let icon_name = icon_name.as_ref();
if let Some(icon) = self.icon_cache.get(icon_name) {
return icon
.value()
.clone()
.ok_or_else(|| Error::icon_not_found(icon_name));
}
let mut searched_themes = Vec::new();
let icon = self
.find_icon(self.theme_name(), icon_name, &mut searched_themes)
.or_else(|| self.find_icon(self.fallback_theme_name(), icon_name, &mut searched_themes))
.map(Arc::from);
self.icon_cache.insert(icon_name.into(), icon.clone());
icon.ok_or_else(|| Error::icon_not_found(icon_name))
}
pub fn theme_name(&self) -> &str {
&self.theme_name
}
pub fn fallback_theme_name(&self) -> &str {
&self.fallback_theme_name
}
pub fn search_paths(&self) -> Cow<[PathBuf]> {
self.search_paths.paths()
}
pub fn set_search_paths(&mut self, search_paths: impl Into<SearchPaths>) {
let search_paths = search_paths.into();
if self.search_paths == search_paths {
return;
}
self.search_paths = search_paths;
self.theme_cache.clear();
self.icon_cache.clear();
}
pub fn set_theme_name_provider(&mut self, theme_name_provider: impl Into<ThemeNameProvider>) {
let theme_name_provider = theme_name_provider.into();
if self.theme_name_provider == theme_name_provider {
return;
}
self.theme_name_provider = theme_name_provider;
}
pub fn update_theme_name(&mut self) -> Result<()> {
let theme_name = self.theme_name_provider.theme_name()?;
if self.theme_name == theme_name {
return Ok(());
}
if self.theme_exists(&theme_name) {
self.theme_name = theme_name;
self.icon_cache.clear();
Ok(())
} else {
Err(Error::theme_not_found(theme_name))
}
}
pub fn set_fallback_theme_name(&mut self, fallback_theme_name: impl Into<String>) {
let fallback_theme_name = fallback_theme_name.into();
if self.fallback_theme_name == fallback_theme_name {
return;
}
self.fallback_theme_name = fallback_theme_name;
self.icon_cache.clear();
}
pub fn theme_exists(&self, theme_name: impl AsRef<str>) -> bool {
let theme_name = theme_name.as_ref();
if theme_name.is_empty() {
return false;
}
!self.load_themes(theme_name).is_empty()
}
fn load_themes(&self, theme_name: &str) -> Arc<IconThemes> {
if let Some(theme) = self.theme_cache.get(theme_name) {
return theme.value().clone();
}
let new_themes = Arc::from(IconThemes::find(theme_name, &self.search_paths()));
self.theme_cache
.insert(theme_name.into(), new_themes.clone());
new_themes
}
fn find_icon(
&self,
theme_name: &str,
icon_name: &str,
searched_themes: &mut Vec<String>,
) -> Option<Icon> {
if theme_name.is_empty() || icon_name.is_empty() {
return None;
}
searched_themes.push(theme_name.into());
let themes = self.load_themes(theme_name);
if let Some(icon) = themes.find_icon(icon_name) {
return Some(icon);
}
for parent in themes.parents() {
if !searched_themes.contains(parent) {
if let Some(icon) = self.find_icon(parent, icon_name, searched_themes) {
return Some(icon);
}
}
}
None
}
}
impl Default for IconLoader {
fn default() -> Self {
IconLoader::new()
}
}