Add Visuals::striped as global default for Grids and Tables

crates/egui/src/grid.rs

@@ -278,7 +278,7 @@ impl GridLayout {
 pub struct Grid {
     id_source: Id,
     num_columns: Option<usize>,
-    striped: bool,
+    striped: Option<bool>,
     min_col_width: Option<f32>,
     min_row_height: Option<f32>,
     max_cell_size: Vec2,
@@ -292,7 +292,7 @@ impl Grid {
         Self {
             id_source: Id::new(id_source),
             num_columns: None,
-            striped: false,
+            striped: None,
             min_col_width: None,
             min_row_height: None,
             max_cell_size: Vec2::INFINITY,
@@ -310,9 +310,9 @@ impl Grid {
     /// If `true`, add a subtle background color to every other row.
     ///
     /// This can make a table easier to read.
-    /// Default: `false`.
+    /// Default is whatever is in [`crate::Visuals::striped`].
     pub fn striped(mut self, striped: bool) -> Self {
-        self.striped = striped;
+        self.striped = Some(striped);
         self
     }
 
@@ -371,6 +371,7 @@ impl Grid {
             spacing,
             start_row,
         } = self;
+        let striped = striped.unwrap_or(ui.visuals().striped);
         let min_col_width = min_col_width.unwrap_or_else(|| ui.spacing().interact_size.x);
         let min_row_height = min_row_height.unwrap_or_else(|| ui.spacing().interact_size.y);
         let spacing = spacing.unwrap_or_else(|| ui.spacing().item_spacing);

crates/egui/src/style.rs

@@ -492,6 +492,10 @@ pub struct Visuals {
 
     /// Show a background behind collapsing headers.
     pub collapsing_header_frame: bool,
+
+    /// Wether or not Grids and Tables should be striped by default
+    /// (have alternating rows differently colored).
+    pub striped: bool,
 }
 
 impl Visuals {
@@ -735,6 +739,8 @@ impl Visuals {
             clip_rect_margin: 3.0, // should be at least half the size of the widest frame stroke + max WidgetVisuals::expansion
             button_frame: true,
             collapsing_header_frame: false,
+
+            striped: false,
         }
     }
 
@@ -1259,6 +1265,8 @@ impl Visuals {
             clip_rect_margin,
             button_frame,
             collapsing_header_frame,
+
+            striped,
         } = self;
 
         ui.collapsing("Background Colors", |ui| {
@@ -1315,6 +1323,8 @@ impl Visuals {
         ui.checkbox(button_frame, "Button has a frame");
         ui.checkbox(collapsing_header_frame, "Collapsing header has a frame");
 
+        ui.checkbox(striped, "By default, add stripes to grids and tables?");
+
         ui.vertical_centered(|ui| reset_button(ui, self));
     }
 }

crates/egui_extras/src/table.rs

@@ -218,7 +218,7 @@ impl Default for TableScrollOptions {
 pub struct TableBuilder<'a> {
     ui: &'a mut Ui,
     columns: Vec<Column>,
-    striped: bool,
+    striped: Option<bool>,
     resizable: bool,
     cell_layout: egui::Layout,
     scroll_options: TableScrollOptions,
@@ -230,16 +230,18 @@ impl<'a> TableBuilder<'a> {
         Self {
             ui,
             columns: Default::default(),
-            striped: false,
+            striped: None,
             resizable: false,
             cell_layout,
             scroll_options: Default::default(),
         }
     }
 
-    /// Enable striped row background for improved readability (default: `false`)
+    /// Enable striped row background for improved readability.
+    ///
+    /// Default is whatever is in [`egui::Visuals::striped`].
     pub fn striped(mut self, striped: bool) -> Self {
-        self.striped = striped;
+        self.striped = Some(striped);
         self
     }
 
@@ -373,6 +375,8 @@ impl<'a> TableBuilder<'a> {
             scroll_options,
         } = self;
 
+        let striped = striped.unwrap_or(ui.visuals().striped);
+
         let state_id = ui.id().with("__table_state");
 
         let initial_widths =
@@ -431,6 +435,8 @@ impl<'a> TableBuilder<'a> {
             scroll_options,
         } = self;
 
+        let striped = striped.unwrap_or(ui.visuals().striped);
+
         let state_id = ui.id().with("__table_state");
 
         let initial_widths =