Add ctx.set_visuals()

CHANGELOG.md

@@ -18,6 +18,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * `egui::popup::popup_below_widget`: show a popup area below another widget.
 * Add `Slider::clamp_to_range(bool)`: if set, clamp the incoming and outgoing values to the slider range.
 * Add: `ui.spacing()`, `ui.spacing_mut()`, `ui.visuals()`, `ui.visuals_mut()`.
+* Add: `ctx.set_visuals()`.
 
 ### Changed 🔧
 

egui/src/context.rs

@@ -462,6 +462,17 @@ impl Context {
         self.memory().options.style = style.into();
     }
 
+    /// The [`Visuals`] used by all new windows, panels etc.
+    ///
+    /// Example:
+    /// ```
+    /// # let mut ctx = egui::CtxRef::default();
+    /// ctx.set_visuals(egui::Visuals::light()); // Switch to light mode
+    /// ```
+    pub fn set_visuals(&self, visuals: crate::Visuals) {
+        std::sync::Arc::make_mut(&mut self.memory().options.style).visuals = visuals;
+    }
+
     /// The number of physical pixels for each logical point.
     pub fn pixels_per_point(&self) -> f32 {
         self.input.pixels_per_point()

egui/src/lib.rs

@@ -126,7 +126,7 @@ pub use {
     painter::Painter,
     response::Response,
     sense::Sense,
-    style::Style,
+    style::{Style, Visuals},
     ui::Ui,
     widgets::*,
 };

egui/src/ui.rs

@@ -122,13 +122,13 @@ impl Ui {
 
     /// Short for `&self.style().visuals`
     /// visuals options for this `Ui` and its children.
-    pub fn visuals(&self) -> &crate::style::Visuals {
+    pub fn visuals(&self) -> &crate::Visuals {
         &self.style.visuals
     }
 
     /// Mutably borrow internal `visuals`.
     /// Changes apply to this `Ui` and its subsequent children.
-    pub fn visuals_mut(&mut self) -> &mut crate::style::Visuals {
+    pub fn visuals_mut(&mut self) -> &mut crate::Visuals {
         &mut self.style_mut().visuals
     }
 

egui_demo_lib/src/wrap_app.rs

@@ -137,7 +137,7 @@ fn dark_light_mode_switch(ui: &mut egui::Ui) {
     let style: egui::Style = (*ui.ctx().style()).clone();
     let new_visuals = style.visuals.light_dark_small_toggle_button(ui);
     if let Some(visuals) = new_visuals {
-        ui.ctx().set_style(egui::Style { visuals, ..style });
+        ui.ctx().set_visuals(visuals);
     }
 }