rename style_trait.rs -> widget_style.rs and font/color fallback for button

crates/egui/src/lib.rs

@@ -434,7 +434,6 @@ mod plugin;
 pub mod response;
 mod sense;
 pub mod style;
-pub mod style_trait;
 pub mod text_selection;
 mod ui;
 mod ui_builder;
@@ -442,6 +441,7 @@ mod ui_stack;
 pub mod util;
 pub mod viewport;
 mod widget_rect;
+pub mod widget_style;
 pub mod widget_text;
 pub mod widgets;
 

crates/egui/src/widgets/button.rs

@@ -1,12 +1,10 @@
-use std::{mem, sync::Arc};
-
 use epaint::Margin;
 
 use crate::{
     Atom, AtomExt as _, AtomKind, AtomLayout, AtomLayoutResponse, Color32, CornerRadius, Frame,
-    Image, IntoAtoms, NumExt as _, Response, RichText, Sense, Stroke, TextStyle, TextWrapMode, Ui,
-    Vec2, Widget, WidgetInfo, WidgetText, WidgetType,
-    style_trait::{ButtonStyle, WidgetState},
+    Image, IntoAtoms, NumExt as _, Response, Sense, Stroke, TextStyle, TextWrapMode, Ui, Vec2,
+    Widget, WidgetInfo, WidgetText, WidgetType,
+    widget_style::{ButtonStyle, WidgetState},
 };
 
 /// Clickable button with text.
@@ -327,24 +325,10 @@ impl<'a> Button<'a> {
 
         frame = frame.inner_margin(button_padding);
 
-        // Apply the correct font and color if Text
-        // We assume that the other WidgetText have already a Fontid and color
-        layout.map_texts(|t| match t {
-            WidgetText::Text(text) => {
-                let rich_text = RichText::new(text.clone())
-                    .font(text_style.font_id.clone())
-                    .color(text_style.color);
-                WidgetText::RichText(Arc::new(rich_text))
-            }
-            WidgetText::RichText(mut text) => {
-                let text_mut = Arc::make_mut(&mut text);
-                *text_mut = mem::take(text_mut)
-                    .font(text_style.font_id.clone())
-                    .color(text_style.color);
-                WidgetText::RichText(text)
-            }
-            w => w,
-        });
+        // Apply the style font and color as fallback
+        layout = layout
+            .fallback_font(text_style.font_id.clone())
+            .fallback_text_color(text_style.color);
 
         // Retrocompatibility with button settings
         layout = if has_frame_margin && (state != WidgetState::Inactive || frame_when_inactive) {

crates/egui/src/widgets/checkbox.rs

@@ -2,7 +2,7 @@ use emath::Rect;
 
 use crate::{
     Atom, AtomLayout, Atoms, Id, IntoAtoms, NumExt as _, Response, Sense, Shape, Ui, Vec2, Widget,
-    WidgetInfo, WidgetType, epaint, pos2, style_trait::CheckboxStyle,
+    WidgetInfo, WidgetType, epaint, pos2, widget_style::CheckboxStyle,
 };
 
 // TODO(emilk): allow checkbox without a text label

crates/egui/src/widgets/separator.rs

@@ -1,4 +1,4 @@
-use crate::{Response, Sense, Ui, Vec2, Widget, vec2};
+use crate::{Response, Sense, Ui, Vec2, Widget, vec2, widget_style::SeparatorStyle};
 
 /// A visual separator. A horizontal or vertical line (depending on [`crate::Layout`]).
 ///
@@ -97,10 +97,13 @@ impl Widget for Separator {
         let id = ui.next_auto_id();
         let response: Option<Response> = ui.ctx().read_response(id);
         let state = response.map(|r| r.widget_state()).unwrap_or_default();
-        let style = ui.style().separator_style(state);
+        let SeparatorStyle {
+            spacing: spacing_style,
+            stroke,
+        } = ui.style().separator_style(state);
 
         // override the spacing if not set
-        let spacing = spacing.unwrap_or(style.spacing);
+        let spacing = spacing.unwrap_or(spacing_style);
 
         let is_horizontal_line = is_horizontal_line
             .unwrap_or_else(|| ui.is_grid() || !ui.layout().main_dir().is_horizontal());
@@ -120,7 +123,6 @@ impl Widget for Separator {
         let (rect, response) = ui.allocate_at_least(size, Sense::hover());
 
         if ui.is_rect_visible(response.rect) {
-            let stroke = style.stroke;
             let painter = ui.painter();
             if is_horizontal_line {
                 painter.hline(