fix: use correct color for avatar in composer pills when there is no image

Author: florianduros

res/css/views/rooms/_BasicMessageComposer.pcss

@@ -10,6 +10,7 @@ Please see LICENSE files in the repository root for full details.
     /* These are set in Javascript */
     --avatar-letter: "";
     --avatar-background: unset;
+    --avatar-color: unset;
     --placeholder: "";
 
     position: relative;

src/Avatar.ts

@@ -13,14 +13,18 @@ import DMRoomMap from "./utils/DMRoomMap";
 import { mediaFromMxc } from "./customisations/Media";
 import { isLocalRoom } from "./utils/localRoom/isLocalRoom";
 import { getFirstGrapheme } from "./utils/strings";
+import ThemeWatcher from "./settings/watchers/ThemeWatcher";
 
 /**
  * Hardcoded from the Compound colors.
  * Shade for background as defined in the compound web implementation
  * https://github.com/vector-im/compound-web/blob/main/src/components/Avatar
  */
-const AVATAR_BG_COLORS = ["#e9f2ff", "#faeefb", "#e3f7ed", "#ffecf0", "#ffefe4", "#e3f5f8", "#f1efff", "#e0f8d9"];
-const AVATAR_TEXT_COLORS = ["#043894", "#671481", "#004933", "#7e0642", "#850000", "#004077", "#4c05b5", "#004b00"];
+const AVATAR_BG_LIGTH_COLORS = ["#e0f8d9", "#e3f5f8", "#faeefb", "#f1efff", "#ffecf0", "#ffefe4"];
+const AVATAR_TEXT_LIGHT_COLORS = ["#005f00", "#00548c", "#822198", "#5d26cd", "#9f0850", "#9b2200"];
+
+const AVATAR_BG_DARK_COLORS = ["#002600", "#001b4e", "#37004e", "#22006a", "#450018", "#470000"];
+const AVATAR_TEXT_DARK_COLORS = ["#56c02c", "#21bacd", "#d991de", "#ad9cfe", "#fe84a2", "#f6913d"];
 
 // Not to be used for BaseAvatar urls as that has similar default avatar fallback already
 export function avatarUrlForMember(
@@ -42,6 +46,13 @@ export function avatarUrlForMember(
     return url;
 }
 
+/**
+ * Determines if the current theme is dark
+ */
+function isDarkTheme(): boolean {
+    return new ThemeWatcher().getEffectiveTheme() === "dark";
+}
+
 /**
  * Determines the HEX color to use in the avatar pills
  * @param id the user or room ID
@@ -51,7 +62,8 @@ export function getAvatarTextColor(id: string): string {
     // eslint-disable-next-line react-hooks/rules-of-hooks
     const index = useIdColorHash(id);
 
-    return AVATAR_TEXT_COLORS[index - 1];
+    // Use light colors by default
+    return isDarkTheme() ? AVATAR_TEXT_DARK_COLORS[index - 1] : AVATAR_TEXT_LIGHT_COLORS[index - 1];
 }
 
 export function avatarUrlForUser(
@@ -103,7 +115,10 @@ export function defaultAvatarUrlForString(s: string): string {
     // overwritten color value in custom themes
     const cssVariable = `--avatar-background-colors_${colorIndex}`;
     const cssValue = getComputedStyle(document.body).getPropertyValue(cssVariable);
-    const color = cssValue || AVATAR_BG_COLORS[colorIndex - 1];
+    // Light colors are the default
+    const color =
+        cssValue || isDarkTheme() ? AVATAR_BG_DARK_COLORS[colorIndex - 1] : AVATAR_BG_LIGTH_COLORS[colorIndex - 1];
+
     let dataUrl = colorToDataURLCache.get(color);
     if (!dataUrl) {
         // validate color as this can come from account_data

src/editor/parts.ts

@@ -297,7 +297,12 @@ export abstract class PillPart extends BasePart implements IPillPart {
     }
 
     // helper method for subclasses
-    protected setAvatarVars(node: HTMLElement, avatarUrl: string, initialLetter: string): void {
+    protected setAvatarVars(
+        node: HTMLElement,
+        avatarUrl: string,
+        initialLetter: string,
+        avatarTextColor?: string,
+    ): void {
         const avatarBackground = `url('${avatarUrl}')`;
         const avatarLetter = `'${initialLetter}'`;
         // check if the value is changing,
@@ -308,6 +313,9 @@ export abstract class PillPart extends BasePart implements IPillPart {
         if (node.style.getPropertyValue("--avatar-letter") !== avatarLetter) {
             node.style.setProperty("--avatar-letter", avatarLetter);
         }
+        if (avatarTextColor && node.style.getPropertyValue("--avatar-color") !== avatarTextColor) {
+            node.style.setProperty("--avatar-color", avatarTextColor);
+        }
     }
 
     public serialize(): ISerializedPillPart {
@@ -421,11 +429,13 @@ class RoomPillPart extends PillPart {
     protected setAvatar(node: HTMLElement): void {
         let initialLetter = "";
         let avatarUrl = Avatar.avatarUrlForRoom(this.room ?? null, 16, 16, "crop");
+        let avatarTextColor: string | undefined;
         if (!avatarUrl) {
             initialLetter = Avatar.getInitialLetter(this.room?.name || this.resourceId) ?? "";
             avatarUrl = Avatar.defaultAvatarUrlForString(this.room?.roomId ?? this.resourceId);
+            avatarTextColor = Avatar.getAvatarTextColor(this.room?.roomId ?? this.resourceId);
         }
-        this.setAvatarVars(node, avatarUrl, initialLetter);
+        this.setAvatarVars(node, avatarUrl, initialLetter, avatarTextColor);
     }
 
     public get type(): IPillPart["type"] {
@@ -479,10 +489,12 @@ class UserPillPart extends PillPart {
         const defaultAvatarUrl = Avatar.defaultAvatarUrlForString(this.member.userId);
         const avatarUrl = Avatar.avatarUrlForMember(this.member, 16, 16, "crop");
         let initialLetter = "";
+        let avatarTextColor: string | undefined;
         if (avatarUrl === defaultAvatarUrl) {
             initialLetter = Avatar.getInitialLetter(name) ?? "";
+            avatarTextColor = Avatar.getAvatarTextColor(this.member.userId);
         }
-        this.setAvatarVars(node, avatarUrl, initialLetter);
+        this.setAvatarVars(node, avatarUrl, initialLetter, avatarTextColor);
     }
 
     protected onClick = (): void => {