Add bundled icons

src/icon_cache.rs

@@ -0,0 +1,49 @@
+use cosmic::widget::icon;
+use std::collections::HashMap;
+
+#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
+pub struct IconCacheKey {
+    name: &'static str,
+    size: u16,
+}
+
+pub struct IconCache {
+    cache: HashMap<IconCacheKey, icon::Handle>,
+}
+
+impl IconCache {
+    pub fn new() -> Self {
+        let mut cache = HashMap::new();
+
+        macro_rules! bundle {
+            ($name:expr, $size:expr) => {
+                let data: &'static [u8] = include_bytes!(concat!("../res/icons/", $name, ".svg"));
+                cache.insert(
+                    IconCacheKey {
+                        name: $name,
+                        size: $size,
+                    },
+                    icon::from_svg_bytes(data).symbolic(true),
+                );
+            };
+        }
+
+        bundle!("folder-open-symbolic", 16);
+        bundle!("go-down-symbolic", 16);
+        bundle!("go-next-symbolic", 16);
+        bundle!("list-add-symbolic", 16);
+        bundle!("object-select-symbolic", 16);
+        bundle!("window-close-symbolic", 16);
+
+        Self { cache }
+    }
+
+    pub fn get(&mut self, name: &'static str, size: u16) -> icon::Icon {
+        let handle = self
+            .cache
+            .entry(IconCacheKey { name, size })
+            .or_insert_with(|| icon::from_name(name).size(size).handle())
+            .clone();
+        icon::icon(handle).size(size)
+    }
+}