Merge pull request #415 from hecrj/feature/configurable-scale-factor

Add `scale_factor` to `Application` and `Sandbox`

1 files changed, 19 insertions, 0 deletions

diff --git a/src/application.rs b/src/application.rs
index b9b71645..47b89dbd 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -186,6 +186,21 @@ pub trait Application: Sized {
         Color::WHITE
     }
 
+    /// Returns the scale factor of the [`Application`].
+    ///
+    /// It can be used to dynamically control the size of the UI at runtime
+    /// (i.e. zooming).
+    ///
+    /// For instance, a scale factor of `2.0` will make widgets twice as big,
+    /// while a scale factor of `0.5` will shrink them to half their size.
+    ///
+    /// By default, it returns `1.0`.
+    ///
+    /// [`Application`]: trait.Application.html
+    fn scale_factor(&self) -> f64 {
+        1.0
+    }
+
     /// Runs the [`Application`].
     ///
     /// On native platforms, this method will take control of the current thread
@@ -273,6 +288,10 @@ where
     fn background_color(&self) -> Color {
         self.0.background_color()
     }
+
+    fn scale_factor(&self) -> f64 {
+        self.0.scale_factor()
+    }
 }
 
 #[cfg(target_arch = "wasm32")]