Reuse viewer windows and organize favorites

src/config.rs

@@ -10,6 +10,7 @@ use serde::{Deserialize, Serialize};
 pub struct AppConfig {
     pub cache_quota_gb: u64,
     pub fast_image_loading: bool,
+    pub viewer_mode: ViewerMode,
     pub locations: Vec<LocationProfile>,
     pub favorites: Vec<FavoriteEntry>,
 }
@@ -19,6 +20,7 @@ impl Default for AppConfig {
         Self {
             cache_quota_gb: 10,
             fast_image_loading: true,
+            viewer_mode: ViewerMode::FitWidth,
             locations: Vec::new(),
             favorites: Vec::new(),
         }
@@ -55,6 +57,39 @@ pub enum LocationKind {
     Sftp,
 }
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum ViewerMode {
+    ActualSize,
+    #[default]
+    FitWidth,
+    FitHeight,
+    TwoPage,
+    Continuous,
+}
+
+impl ViewerMode {
+    pub fn dropdown_index(self) -> u32 {
+        match self {
+            Self::ActualSize => 0,
+            Self::FitWidth => 1,
+            Self::FitHeight => 2,
+            Self::TwoPage => 3,
+            Self::Continuous => 4,
+        }
+    }
+
+    pub fn from_dropdown_index(index: u32) -> Self {
+        match index {
+            0 => Self::ActualSize,
+            2 => Self::FitHeight,
+            3 => Self::TwoPage,
+            4 => Self::Continuous,
+            _ => Self::FitWidth,
+        }
+    }
+}
+
 impl AppConfig {
     pub fn load_or_create(path: &Path) -> Result<Self> {
         if path.exists() {
@@ -139,6 +174,7 @@ mod tests {
         let config = AppConfig {
             cache_quota_gb: 0,
             fast_image_loading: true,
+            viewer_mode: ViewerMode::FitWidth,
             locations: vec![LocationProfile {
                 name: "테스트".into(),
                 kind: LocationKind::Sftp,
@@ -173,6 +209,21 @@ mod tests {
     fn fast_image_loading_is_enabled_for_existing_configs() {
         let decoded: AppConfig = toml::from_str("cache_quota_gb = 10\n").unwrap();
         assert!(decoded.fast_image_loading);
+        assert_eq!(decoded.viewer_mode, ViewerMode::FitWidth);
         assert!(decoded.favorites.is_empty());
     }
+
+    #[test]
+    fn viewer_modes_round_trip_through_dropdown_indices() {
+        for mode in [
+            ViewerMode::ActualSize,
+            ViewerMode::FitWidth,
+            ViewerMode::FitHeight,
+            ViewerMode::TwoPage,
+            ViewerMode::Continuous,
+        ] {
+            assert_eq!(ViewerMode::from_dropdown_index(mode.dropdown_index()), mode);
+        }
+        assert_eq!(ViewerMode::from_dropdown_index(99), ViewerMode::FitWidth);
+    }
 }