Small light mode fixes (#9984)

Author: emilk

crates/viewer/re_time_panel/src/data_density_graph.rs

@@ -5,16 +5,18 @@
 
 use std::sync::Arc;
 
-use egui::emath::Rangef;
-use egui::{Color32, NumExt as _, Rect, Shape, Tooltip, epaint::Vertex, lerp, pos2, remap};
+use egui::{Color32, NumExt as _, Rangef, Rect, Shape, Tooltip, epaint::Vertex, lerp, pos2, remap};
 
 use re_chunk_store::Chunk;
 use re_chunk_store::RangeQuery;
 use re_log_types::{ComponentPath, ResolvedTimeRange, TimeInt, TimelineName};
+use re_ui::UiExt as _;
 use re_viewer_context::{Item, TimeControl, UiLayout, ViewerContext};
 
-use crate::recursive_chunks_per_timeline_subscriber::PathRecursiveChunksPerTimelineStoreSubscriber;
-use crate::time_panel::TimePanelItem;
+use crate::{
+    recursive_chunks_per_timeline_subscriber::PathRecursiveChunksPerTimelineStoreSubscriber,
+    time_panel::TimePanelItem,
+};
 
 use super::time_ranges_ui::TimeRangesUi;
 
@@ -734,11 +736,22 @@ impl<'a> DensityGraphBuilder<'a> {
 
 fn graph_color(ctx: &ViewerContext<'_>, item: &Item, ui: &egui::Ui) -> Color32 {
     let is_selected = ctx.selection().contains_item(item);
-    if is_selected {
-        make_brighter(ui.visuals().widgets.active.fg_stroke.color)
-    } else {
-        //TODO(ab): tokenize that!
-        Color32::from_gray(225)
+
+    match ui.theme() {
+        egui::Theme::Dark => {
+            if is_selected {
+                make_brighter(ui.visuals().widgets.active.fg_stroke.color)
+            } else {
+                Color32::from_gray(225) //TODO(ab): tokenize
+            }
+        }
+        egui::Theme::Light => {
+            if is_selected {
+                make_darker(ui.visuals().widgets.active.fg_stroke.color)
+            } else {
+                Color32::from_gray(64) //TODO(ab): tokenize
+            }
+        }
     }
 }
 
@@ -750,3 +763,12 @@ fn make_brighter(color: Color32) -> Color32 {
         b.saturating_add(64),
     )
 }
+
+fn make_darker(color: Color32) -> Color32 {
+    let [r, g, b, _] = color.to_array();
+    egui::Color32::from_rgb(
+        r.saturating_sub(64),
+        g.saturating_sub(64),
+        b.saturating_sub(64),
+    )
+}

crates/viewer/re_ui/src/syntax_highlighting.rs

@@ -83,7 +83,11 @@ fn text_format(style: &Style) -> TextFormat {
 
 fn faint_text_format(style: &Style) -> TextFormat {
     TextFormat {
-        color: Color32::WHITE,
+        color: if style.visuals.dark_mode {
+            Color32::WHITE
+        } else {
+            Color32::BLACK
+        },
 
         ..text_format(style)
     }