[layout] remove ui.horizontal_centered and make centering the default

egui/src/containers/window.rs

@@ -601,7 +601,7 @@ fn show_title_bar(
     collapsing: &mut collapsing_header::State,
     collapsible: bool,
 ) -> TitleBar {
-    let title_bar_and_rect = ui.horizontal_centered(|ui| {
+    let title_bar_and_rect = ui.horizontal(|ui| {
         ui.set_desired_height(title_label.font_height(ui.fonts(), ui.style()));
 
         let item_spacing = ui.style().spacing.item_spacing;

egui/src/demos/color_test.rs

@@ -59,7 +59,7 @@ impl ColorTest {
             let tex_color = Rgba::new(1.0, 0.25, 0.25, 1.0);
             let vertex_color = Rgba::new(0.5, 0.75, 0.75, 1.0);
 
-            ui.horizontal_centered(|ui| {
+            ui.horizontal(|ui| {
                 let color_size = ui.style().spacing.interact_size;
                 ui.label("texture");
                 show_color(ui, tex_color, color_size);
@@ -72,7 +72,7 @@ impl ColorTest {
                 self.vertex_gradient(ui, "Ground truth (vertices)", WHITE, &g);
                 self.tex_gradient(ui, tex_loader, "Ground truth (texture)", WHITE, &g);
             }
-            ui.horizontal_centered(|ui| {
+            ui.horizontal(|ui| {
                 let g = Gradient::one_color(Srgba::from(tex_color));
                 let tex = self.tex_mngr.get(tex_loader, &g);
                 let texel_offset = 0.5 / (g.0.len() as f32);
@@ -132,7 +132,7 @@ impl ColorTest {
     ) {
         let is_opaque = left.is_opaque() && right.is_opaque();
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             let color_size = ui.style().spacing.interact_size;
             if !is_opaque {
                 ui.label("Background:");
@@ -228,7 +228,7 @@ impl ColorTest {
         if !self.texture_gradients {
             return;
         }
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             let tex = self.tex_mngr.get(tex_loader, gradient);
             let texel_offset = 0.5 / (gradient.0.len() as f32);
             let uv = Rect::from_min_max(pos2(texel_offset, 0.0), pos2(1.0 - texel_offset, 1.0));
@@ -245,7 +245,7 @@ impl ColorTest {
         if !self.vertex_gradients {
             return;
         }
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             vertex_gradient(ui, bg_fill, gradient).tooltip_text(format!(
                 "A triangle mesh that is {} vertices wide",
                 gradient.0.len()

egui/src/demos/demo_window.rs

@@ -181,7 +181,7 @@ impl ColorWidgets {
             rgba_premul,
         } = self;
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.color_edit_button_srgba_unmultiplied(srgba_unmul);
             ui.label(format!(
                 "sRGBA: {} {} {} {}",
@@ -189,7 +189,7 @@ impl ColorWidgets {
             ));
         });
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.color_edit_button_srgba_premultiplied(srgba_premul);
             ui.label(format!(
                 "sRGBA with premultiplied alpha: {} {} {} {}",
@@ -197,7 +197,7 @@ impl ColorWidgets {
             ));
         });
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.color_edit_button_rgba_unmultiplied(rgba_unmul);
             ui.label(format!(
                 "Linear RGBA: {:.02} {:.02} {:.02} {:.02}",
@@ -205,7 +205,7 @@ impl ColorWidgets {
             ));
         });
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.color_edit_button_rgba_premultiplied(rgba_premul);
             ui.label(format!(
                 "Linear RGBA with premultiplied alpha: {:.02} {:.02} {:.02} {:.02}",

egui/src/demos/toggle_switch.rs

@@ -73,7 +73,7 @@ pub fn toggle(ui: &mut Ui, on: &mut bool) -> Response {
 pub fn demo(ui: &mut Ui, on: &mut bool) {
     ui.label("It's easy to create your own widgets!");
     let url = format!("https://github.com/emilk/egui/blob/master/{}", file!());
-    ui.horizontal_centered(|ui| {
+    ui.horizontal(|ui| {
         ui.label("Like this toggle switch:");
         toggle(ui, on).tooltip_text("Click to toggle");
         ui.add(Hyperlink::new(url).text("(source code)"));

egui/src/demos/widgets.rs

@@ -55,7 +55,7 @@ impl Widgets {
 
         ui.add(Checkbox::new(&mut self.button_enabled, "Button enabled"));
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             if ui
                 .add(Button::new("Click me").enabled(self.button_enabled))
                 .tooltip_text("This will just increase a counter.")
@@ -85,7 +85,7 @@ impl Widgets {
         ui.separator();
         {
             ui.label("An angle stored as radians, but edited in degrees:");
-            ui.horizontal_centered(|ui| {
+            ui.horizontal(|ui| {
                 ui.style_mut().spacing.item_spacing.x = 0.0;
                 ui.drag_angle(&mut self.angle);
                 ui.label(format!(" = {} radians", self.angle));
@@ -93,7 +93,7 @@ impl Widgets {
         }
         ui.separator();
 
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.add(Label::new("Click to select a different text color: ").text_color(self.color));
             ui.color_edit_button_srgba(&mut self.color);
         });

egui/src/menu.rs

@@ -58,7 +58,7 @@ impl BarState {
 }
 
 pub fn bar<R>(ui: &mut Ui, add_contents: impl FnOnce(&mut Ui) -> R) -> (R, Rect) {
-    ui.horizontal_centered(|ui| {
+    ui.horizontal(|ui| {
         Frame::menu_bar(ui.style()).show(ui, |ui| {
             let mut style = ui.style().clone();
             style.spacing.button_padding = vec2(2.0, 0.0);

egui/src/style.rs

@@ -295,7 +295,7 @@ impl Style {
             visuals,
             animation_time,
         } = self;
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.label("Default text style:");
             for &value in &[TextStyle::Body, TextStyle::Monospace] {
                 ui.radio_value(format!("{:?}", value), body_text_style, value);
@@ -435,7 +435,7 @@ impl Visuals {
 impl Stroke {
     pub fn ui(&mut self, ui: &mut crate::Ui, text: &str) {
         let Self { width, color } = self;
-        ui.horizontal_centered(|ui| {
+        ui.horizontal(|ui| {
             ui.label(format!("{}: ", text));
             ui.add(DragValue::f32(width).speed(0.1).range(0.0..=5.0))
                 .tooltip_text("Width");
@@ -451,7 +451,7 @@ fn ui_slider_vec2(
     range: std::ops::RangeInclusive<f32>,
     text: &str,
 ) -> Response {
-    let (_, rect) = ui.horizontal_centered(|ui| {
+    let (_, rect) = ui.horizontal(|ui| {
         ui.label(format!("{}: ", text));
         ui.add(Slider::f32(&mut value.x, range.clone()).text("w"));
         ui.add(Slider::f32(&mut value.y, range.clone()).text("h"));
@@ -460,7 +460,7 @@ fn ui_slider_vec2(
 }
 
 fn ui_color(ui: &mut Ui, srgba: &mut Srgba, text: &str) {
-    ui.horizontal_centered(|ui| {
+    ui.horizontal(|ui| {
         ui.label(format!("{}: ", text));
         ui.color_edit_button_srgba(srgba);
     });

egui/src/ui.rs

@@ -656,17 +656,10 @@ impl Ui {
         ))
     }
 
-    /// Start a ui with horizontal layout
+    /// Start a ui with horizontal layout.
+    /// Elements will be centered on the Y axis.
+    /// Initial height is `style.spacing.interact_size.y`.
     pub fn horizontal<R>(&mut self, add_contents: impl FnOnce(&mut Ui) -> R) -> (R, Rect) {
-        let initial_size = vec2(
-            self.available().width(),
-            self.style().spacing.interact_size.y,
-        );
-        self.inner_layout(Layout::horizontal(Align::Min), initial_size, add_contents)
-    }
-
-    /// Start a ui with horizontal layout where elements are centered on the Y axis.
-    pub fn horizontal_centered<R>(&mut self, add_contents: impl FnOnce(&mut Ui) -> R) -> (R, Rect) {
         let initial_size = vec2(
             self.available().width(),
             self.style().spacing.interact_size.y,

egui/src/widgets/slider.rs

@@ -277,7 +277,7 @@ impl<'a> Widget for Slider<'a> {
         if let Some(text) = &self.text {
             self.id = self.id.or_else(|| Some(ui.make_unique_child_id(text)));
 
-            ui.horizontal_centered(|ui| {
+            ui.horizontal(|ui| {
                 let slider_response = self.allocate_slide_space(ui, height);
                 self.slider_ui(ui, &slider_response);
                 let x_range = x_range(&slider_response.rect);