expose scale_factor from iced

CHANGELOG.md

@@ -3,6 +3,7 @@
 Added:
 
 - Option to colorize nicks in the nick list (and an option to control it separately from in the buffer)
+- Option to control application scale factor
 
 Fixed:
 

config.yaml

@@ -48,6 +48,11 @@ font:
   # - Default is 13
   size: 13
 
+# Scale factor
+# A scale factor of 2.0 will make the UI twice as big, while a scale factor of 0.5 will shrink it to half its size.
+# Default is 1.0.
+scale_factor: 1.0
+
 # Buffer settings
 buffer:
   # Nickname settings

data/src/config.rs

@@ -30,6 +30,7 @@ pub struct Config {
     pub themes: Themes,
     pub servers: ServerMap,
     pub font: Font,
+    pub scale_factor: f64,
     pub buffer: Buffer,
     pub dashboard: Dashboard,
     pub keys: Keys,
@@ -92,6 +93,8 @@ impl Config {
             pub servers: ServerMap,
             #[serde(default)]
             pub font: Font,
+            #[serde(default = "default_scale_factor")]
+            pub scale_factor: f64,
             #[serde(default, alias = "new_buffer")]
             pub buffer: Buffer,
             #[serde(default)]
@@ -109,6 +112,7 @@ impl Config {
             theme,
             servers,
             font,
+            scale_factor,
             buffer,
             dashboard,
             keys,
@@ -117,11 +121,13 @@ impl Config {
             .map_err(|e| Error::Parse(e.to_string()))?;
 
         let themes = Self::load_themes(&theme).unwrap_or_default();
+        let scale_factor = scale_factor.clamp(0.1, 3.0);
 
         Ok(Config {
             themes,
             servers,
             font,
+            scale_factor,
             buffer,
             dashboard,
             keys,
@@ -204,6 +210,10 @@ pub fn create_themes_dir() {
     }
 }
 
+fn default_scale_factor() -> f64 {
+    1.0
+}
+
 #[derive(Debug, Error, Clone)]
 pub enum Error {
     #[error("config could not be read: {0}")]

src/main.rs

@@ -464,6 +464,10 @@ impl Application for Halloy {
         self.theme.clone()
     }
 
+    fn scale_factor(&self) -> f64 {
+        self.config.scale_factor
+    }
+
     fn subscription(&self) -> Subscription<Message> {
         let tick = iced::time::every(Duration::from_secs(1)).map(Message::Tick);