From 0ca0c7cf434b404b4b4c350c9a13c3ea647dae88 Mon Sep 17 00:00:00 2001
From: StroepWafel <contact@stroepwafel.au>
Date: Mon, 20 Apr 2026 21:43:05 +0930
Subject: [PATCH] add handlers for individual Channels

---
 .gitignore                                    |  3 +-
 src/seqta/ui/colors/Manager.ts                | 37 ++++++++++-
 .../ui/colors/customThemeAdaptiveBindings.ts  | 64 ++++++++++++++-----
 3 files changed, 85 insertions(+), 19 deletions(-)

diff --git a/.gitignore b/.gitignore
index e24ea199..46e7ae3b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,4 +22,5 @@ betterseqtaplus-safari/
 .parcel-cache
 .env
 .env.submit
-dependency-graph.svg
\ No newline at end of file
+dependency-graph.svg
+/src/resources/themes
diff --git a/src/seqta/ui/colors/Manager.ts b/src/seqta/ui/colors/Manager.ts
index d72c8844..2adccfbf 100644
--- a/src/seqta/ui/colors/Manager.ts
+++ b/src/seqta/ui/colors/Manager.ts
@@ -5,7 +5,7 @@ import { lightenAndPaleColor } from "./lightenAndPaleColor";
 import ColorLuminance from "./ColorLuminance";
 import { settingsState } from "@/seqta/utils/listeners/SettingsState";
 import { getAdaptiveColour } from "@/seqta/utils/adaptiveThemeColour";
-import { getCustomThemeAdaptiveCssVariables } from "@/seqta/ui/colors/customThemeAdaptiveBindings";
+import { getCustomThemeAdaptiveCssVariableBindings } from "@/seqta/ui/colors/customThemeAdaptiveBindings";
 
 import darkLogo from "@/resources/icons/betterseqta-light-full.png";
 import lightLogo from "@/resources/icons/betterseqta-dark-full.png";
@@ -84,6 +84,21 @@ function cancelColorTransition() {
   }
 }
 
+function getRepresentativeRgbChannels(s: string): { r: number; g: number; b: number } | null {
+  const parsedHex = parseRepresentativeHex(s);
+  if (!parsedHex) return null;
+  try {
+    const [r, g, b] = Color(parsedHex).rgb().array();
+    return {
+      r: Math.round(r),
+      g: Math.round(g),
+      b: Math.round(b),
+    };
+  } catch {
+    return null;
+  }
+}
+
 function applyColorsWith(selectedColor: string) {
   if (settingsState.transparencyEffects) {
     document.documentElement.classList.add("transparencyEffects");
@@ -129,8 +144,24 @@ function applyColorsWith(selectedColor: string) {
   applyProperties({ ...commonProps, ...modeProps, ...dynamicProps });
 
   if (settingsState.selectedTheme) {
-    for (const name of getCustomThemeAdaptiveCssVariables()) {
-      setCSSVar(name, selectedColor);
+    const channels = getRepresentativeRgbChannels(selectedColor);
+    for (const binding of getCustomThemeAdaptiveCssVariableBindings()) {
+      if (!binding.channel) {
+        setCSSVar(binding.cssVarName, selectedColor);
+        continue;
+      }
+
+      if (!channels) {
+        continue;
+      }
+
+      if (binding.channel === "r") {
+        setCSSVar(binding.cssVarName, String(channels.r));
+      } else if (binding.channel === "g") {
+        setCSSVar(binding.cssVarName, String(channels.g));
+      } else {
+        setCSSVar(binding.cssVarName, String(channels.b));
+      }
     }
   }
 
diff --git a/src/seqta/ui/colors/customThemeAdaptiveBindings.ts b/src/seqta/ui/colors/customThemeAdaptiveBindings.ts
index dba35e3f..cdd0c823 100644
--- a/src/seqta/ui/colors/customThemeAdaptiveBindings.ts
+++ b/src/seqta/ui/colors/customThemeAdaptiveBindings.ts
@@ -1,20 +1,49 @@
 /** Tracks which author-declared CSS variables mirror the effective accent; not persisted in settings storage. */
 
 const VALID_CUSTOM_PROP = /^--[a-zA-Z0-9_-]{1,120}$/;
+const VALID_CHANNEL = /^(r|g|b)$/;
 
-let boundNames: string[] = [];
+export type AdaptiveChannel = "r" | "g" | "b";
 
-export function normalizeAdaptiveCssVariableNames(
+export type AdaptiveCssVariableBinding = {
+  cssVarName: string;
+  channel?: AdaptiveChannel;
+};
+
+let boundBindings: AdaptiveCssVariableBinding[] = [];
+
+function parseAdaptiveBinding(
+  rawBinding: string,
+): AdaptiveCssVariableBinding | null {
+  const trimmed = rawBinding.trim();
+  if (!trimmed) return null;
+
+  const [rawName, rawChannel] = trimmed.split(":", 2);
+  const cssVarName = rawName?.trim() ?? "";
+  if (!VALID_CUSTOM_PROP.test(cssVarName)) return null;
+
+  if (!rawChannel) return { cssVarName };
+
+  const channel = rawChannel.trim().toLowerCase();
+  if (!VALID_CHANNEL.test(channel)) return null;
+
+  return { cssVarName, channel: channel as AdaptiveChannel };
+}
+
+export function normalizeAdaptiveCssVariableBindings(
   names: string[] | undefined,
-): string[] {
+): AdaptiveCssVariableBinding[] {
   if (!names?.length) return [];
-  const out: string[] = [];
+  const out: AdaptiveCssVariableBinding[] = [];
   const seen = new Set<string>();
+
   for (const raw of names) {
-    const s = raw.trim();
-    if (!VALID_CUSTOM_PROP.test(s) || seen.has(s)) continue;
-    seen.add(s);
-    out.push(s);
+    const parsed = parseAdaptiveBinding(raw);
+    if (!parsed) continue;
+    const key = `${parsed.cssVarName}:${parsed.channel ?? "full"}`;
+    if (seen.has(key)) continue;
+    seen.add(key);
+    out.push(parsed);
   }
   return out;
 }
@@ -22,19 +51,24 @@ export function normalizeAdaptiveCssVariableNames(
 export function setCustomThemeAdaptiveCssVariables(
   names: string[] | undefined,
 ): void {
-  for (const n of boundNames) {
-    document.documentElement.style.removeProperty(n);
+  for (const binding of boundBindings) {
+    document.documentElement.style.removeProperty(binding.cssVarName);
   }
-  boundNames = normalizeAdaptiveCssVariableNames(names);
+  boundBindings = normalizeAdaptiveCssVariableBindings(names);
 }
 
+export function getCustomThemeAdaptiveCssVariableBindings(): AdaptiveCssVariableBinding[] {
+  return boundBindings;
+}
+
+// Backward-compatible helper for existing callsites.
 export function getCustomThemeAdaptiveCssVariables(): string[] {
-  return boundNames;
+  return boundBindings.map((b) => b.cssVarName);
 }
 
 export function clearCustomThemeAdaptiveCssVariables(): void {
-  for (const n of boundNames) {
-    document.documentElement.style.removeProperty(n);
+  for (const binding of boundBindings) {
+    document.documentElement.style.removeProperty(binding.cssVarName);
   }
-  boundNames = [];
+  boundBindings = [];
 }