feat: add BaseImage component with image fallback display (#2193)

docusaurus/docs/React/components/contexts/component-context.mdx

@@ -69,6 +69,22 @@ Custom UI component to display a user's avatar.
 | --------- | ---------------------------------------------------------- |
 | component | <GHComponentLink text='Avatar' path='/Avatar/Avatar.tsx'/> |
 
+### BaseImage
+
+Custom UI component to display image resp. a fallback in case of load error, in `<img/>` element. The  default resp. custom (from `ComponentContext`) `BaseImage` component is rendered by:
+
+- <GHComponentLink text='Image' path='/Gallery/Image.tsx'/> - single image attachment in message list
+- <GHComponentLink text='Gallery' path='/Gallery/Gallery.tsx'/> - group of image attachments in message list
+- <GHComponentLink text='AttachmentPreviewList' path='/MessageInput/AttachmentPreviewList.tsx'/> - image uploads preview in message input (composer)
+
+The `BaseImage` component accepts the same props as `<img/>` element.
+
+The [default `BaseImage` component](../../utility-components/base-image) tries to load and display an image and if the load fails, then an SVG image fallback is applied to the `<img/>` element as a CSS mask targeting attached `str-chat__base-image--load-failed` class.
+
+| Type      | Default                                                               |
+|-----------|-----------------------------------------------------------------------|
+| component | <GHComponentLink text='BaseImage' path='/Gallery/BaseImage.tsx'/> |
+
 ### CooldownTimer
 
 Custom UI component to display the slow mode cooldown timer.

docusaurus/docs/React/components/utility-components/base-image.mdx

@@ -0,0 +1,94 @@
+---
+id: base-image
+sidebar_position: 9
+title: BaseImage
+---
+
+import ImageShowcase from '@site/src/components/ImageShowcase';
+import BaseImageInGallery from '../../assets/base-image-fallback-in-attachment-gallery.png'
+import BaseImageInAttachmentPreview from '../../assets/base-image-fallback-in-attachment-preview.png'
+import BaseImageInImageAttachment from '../../assets/base-image-fallback-in-image-attachment.png'
+
+The `BaseImage` component's purpose is to display an image or a fallback if loading the resource has failed. The component is used internally by:
+
+- `Image` component - used to display image attachments in `Message`
+- `Gallery` component - used to display image gallery among `Message` attachments
+- `AttachmentPreviewList` component - used to display attachment previews in `MessageInput`
+
+The default image fallbacks are rendered as follows:
+
+<ImageShowcase
+  border
+  items={[
+    {
+      image: BaseImageInImageAttachment,
+      caption: <span>BaseImage in image attachment</span>,
+      alt: 'BaseImage in image attachment',
+    },
+    {
+      image: BaseImageInGallery,
+      caption: <span>BaseImage in image attachment gallery</span>,
+      alt: 'BaseImage in image attachment gallery',
+    },
+    {
+      image: BaseImageInAttachmentPreview,
+      caption: <span>BaseImage in attachment preview</span>,
+      alt: 'BaseImage in attachment preview',
+    },
+  ]}
+/>
+
+## Usage
+
+### Custom image fallback
+
+The default image fallback can be changed by applying a new CSS data image to the fallback mask in the `BaseImage`'s `<img/>` element. The data image has to be assigned to a CSS variable `--str-chat__image-fallback-icon` within the scope of `.str-chat` class. An example follows:
+
+```css
+
+.str-chat {
+  --str-chat__image-fallback-icon: url("data:image/svg+xml;base64,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");
+}
+```
+
+We can change the mask dimensions or color by applying the following rules to the image's class `.str-chat__base-image--load-failed`, that signals the image load has failed:
+
+```css
+:root{
+  --custom-icon-fill-color: #223344;
+  --custom-icon-width-and-height: 4rem 4rem;
+}
+
+.str-chat__base-image--load-failed {
+  mask-size: var(--custom-icon-width-and-height);
+  -webkit-mask-size: var(--custom-icon-width-and-height);
+  background-color: var(--custom-icon-fill-color);
+}
+```
+
+### Custom BaseImage
+
+The default `BaseImage` can be overridden by passing a custom component to `Channel` props:
+
+
+```tsx
+import {ComponentProps } from 'react';
+import { Channel } from 'stream-chat-react';
+
+const CustomBaseImage = (props: ComponentProps<'img'>) => {
+    // your implementation...
+}
+
+export const MyUI = () => {
+  return (
+    <Channel BaseImage={CustomBaseImage}>
+      {{/* more components */ }}
+    </Channel>
+  );
+};
+```
+
+## Props
+
+The component accepts the `img` component props.
+

src/components/Attachment/Audio.tsx

@@ -107,7 +107,7 @@ export const ProgressBar = ({ onClick, progress }: ProgressBarProps) => (
     role='progressbar'
     style={{
       background: `linear-gradient(
-		 to right, 
+		 to right,
 		 var(--str-chat__primary-color),
 		 var(--str-chat__primary-color) ${progress}%,
 		 var(--str-chat__disabled-color) ${progress}%,

src/components/Attachment/__tests__/Card.test.js

@@ -164,10 +164,11 @@ describe('Card', () => {
           >
             <img
               alt="test"
-              class="str-chat__message-attachment--img"
+              class="str-chat__message-attachment--img str-chat__base-image"
               data-testid="image-test"
               src="test.jpg"
               tabindex="0"
+              title="test"
             />
           </div>
           <div
@@ -217,10 +218,11 @@ describe('Card', () => {
           >
             <img
               alt="test"
-              class="str-chat__message-attachment--img"
+              class="str-chat__message-attachment--img str-chat__base-image"
               data-testid="image-test"
               src="test.jpg"
               tabindex="0"
+              title="test"
             />
           </div>
           <div
@@ -296,10 +298,11 @@ describe('Card', () => {
           >
             <img
               alt="test"
-              class="str-chat__message-attachment--img"
+              class="str-chat__message-attachment--img str-chat__base-image"
               data-testid="image-test"
               src="test.jpg"
               tabindex="0"
+              title="test"
             />
           </div>
         </div>

src/components/Attachment/__tests__/__snapshots__/Card.test.js.snap

@@ -11,10 +11,11 @@ exports[`Card theme V2 (1) should render card without caption if attachment type
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -139,10 +140,11 @@ exports[`Card theme V2 (3) should render card without caption if attachment type
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -232,10 +234,11 @@ exports[`Card theme V2 (7) should render audio with caption using og_scrape_url
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -388,10 +391,11 @@ exports[`Card theme V2 (9) should render image with caption using og_scrape_url
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -441,10 +445,11 @@ exports[`Card theme V2 (10) should render audio without title if attachment type
     >
       <img
         alt="dummyAttachment_thumb_url"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_thumb_url"
       />
     </div>
     <div
@@ -587,10 +592,11 @@ exports[`Card theme V2 (12) should render image without title if attachment type
     >
       <img
         alt="dummyAttachment_thumb_url"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_thumb_url"
       />
     </div>
     <div
@@ -635,10 +641,11 @@ exports[`Card theme V2 (13) should render audio without title and with caption u
     >
       <img
         alt="dummyAttachment_thumb_url"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_thumb_url"
       />
     </div>
     <div
@@ -781,10 +788,11 @@ exports[`Card theme V2 (15) should render image without title and with caption u
     >
       <img
         alt="dummyAttachment_thumb_url"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_thumb_url"
       />
     </div>
     <div
@@ -1014,10 +1022,11 @@ exports[`Card theme V2 (19) should render image loaded from thumb_url not audio
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_thumb_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1072,10 +1081,11 @@ exports[`Card theme V2 (20) should render image loaded from thumb_url not video
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_thumb_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1125,10 +1135,11 @@ exports[`Card theme V2 (21) should render image loaded from thumb_url if attachm
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_thumb_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1178,10 +1189,11 @@ exports[`Card theme V2 (22) should render image loaded from image_url not audio
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1236,10 +1248,11 @@ exports[`Card theme V2 (23) should render image loaded from image_url not video
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1289,10 +1302,11 @@ exports[`Card theme V2 (24) should render image loaded from image_url if attachm
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div
@@ -1342,10 +1356,11 @@ exports[`Card theme V2 (25) should render audio widget with image loaded from th
     >
       <img
         alt="dummyAttachment_title"
-        class="str-chat__message-attachment--img"
+        class="str-chat__message-attachment--img str-chat__base-image"
         data-testid="image-test"
         src="dummyAttachment_image_url"
         tabindex="0"
+        title="dummyAttachment_title"
       />
     </div>
     <div

src/components/Channel/Channel.tsx

@@ -109,7 +109,9 @@ type ChannelPropsForwardedToComponentContext<
   AutocompleteSuggestionList?: ComponentContextValue<StreamChatGenerics>['AutocompleteSuggestionList'];
   /** UI component to display a user's avatar, defaults to and accepts same props as: [Avatar](https://github.com/GetStream/stream-chat-react/blob/master/src/components/Avatar/Avatar.tsx) */
   Avatar?: ComponentContextValue<StreamChatGenerics>['Avatar'];
-  /** Custom UI component to display the slow mode cooldown timer, defaults to and accepts same props as: [CooldownTimer](https://github.com/GetStream/stream-chat-react/blob/master/src/components/MessageInput/hooks/useCooldownTimer.tsx) */
+  /** Custom UI component to display <img/> elements resp. a fallback in case of load error, defaults to and accepts same props as: [BaseImage](https://github.com/GetStream/stream-chat-react/blob/master/src/components/Gallery/BaseImage.tsx) */
+  BaseImage?: ComponentContextValue<StreamChatGenerics>['BaseImage'];
+  /** Custom UI component to display the slow mode cooldown timer, defaults to and accepts same props as: [CooldownTimer](https://github.com/GetStream/stream-chat-react/blob/master/src/components/MessageInput/CooldownTimer.tsx) */
   CooldownTimer?: ComponentContextValue<StreamChatGenerics>['CooldownTimer'];
   /** Custom UI component for date separators, defaults to and accepts same props as: [DateSeparator](https://github.com/GetStream/stream-chat-react/blob/master/src/components/DateSeparator.tsx) */
   DateSeparator?: ComponentContextValue<StreamChatGenerics>['DateSeparator'];
@@ -1013,6 +1015,7 @@ const ChannelInner = <
       AutocompleteSuggestionItem: props.AutocompleteSuggestionItem,
       AutocompleteSuggestionList: props.AutocompleteSuggestionList,
       Avatar: props.Avatar,
+      BaseImage: props.BaseImage,
       CooldownTimer: props.CooldownTimer,
       DateSeparator: props.DateSeparator,
       EditMessageInput: props.EditMessageInput,