implement first draft of image lightbox

src/domain/session/SessionViewModel.js

@@ -207,7 +207,9 @@ export class SessionViewModel extends ViewModel {
             this._lightboxViewModel = this.disposeTracked(this._lightboxViewModel);
         }
         if (eventId) {
-            this._lightboxViewModel = this.track(new LightboxViewModel(this.childOptions({eventId})));
+            const roomId = this.navigation.path.get("room").value;
+            const room = this._sessionContainer.session.rooms.get(roomId);
+            this._lightboxViewModel = this.track(new LightboxViewModel(this.childOptions({eventId, room})));
         }
         this.emitChange("lightboxViewModel");
     }

src/domain/session/room/LightboxViewModel.js

@@ -20,14 +20,78 @@ export class LightboxViewModel extends ViewModel {
     constructor(options) {
         super(options);
         this._eventId = options.eventId;
+        this._unencryptedImageUrl = null;
+        this._decryptedImage = null;
         this._closeUrl = this.urlCreator.urlUntilSegment("room");
+        this._eventEntry = null;
+        this._date = null;
+        this._subscribeToEvent(options.room, options.eventId);
     }
 
-    get eventId() {
+    _subscribeToEvent(room, eventId) {
-        return this._eventId;
+        const eventObservable = room.observeEvent(eventId);
+        this.track(eventObservable.subscribe(eventEntry => {
+            this._loadEvent(room, eventEntry);
+        }));
+        this._loadEvent(room, eventObservable.get());
+    }
+
+    async _loadEvent(room, eventEntry) {
+        if (!eventEntry) {
+            return;
+        }
+        const {mediaRepository} = room;
+        this._eventEntry = eventEntry;
+        const {content} = this._eventEntry;
+        this._date = this._eventEntry.timestamp ? new Date(this._eventEntry.timestamp) : null;
+        if (content.url) {
+            this._unencryptedImageUrl = mediaRepository.mxcUrl(content.url);
+            this.emitChange("imageUrl");
+        } else if (content.file) {
+            this._decryptedImage = this.track(await mediaRepository.downloadEncryptedFile(content.file));
+            this.emitChange("imageUrl");
+        }
+    }
+
+    get imageWidth() {
+        return this._eventEntry?.content?.info?.w;
+    }
+
+    get imageHeight() {
+        return this._eventEntry?.content?.info?.h;
+    }
+
+    get name() {
+        return this._eventEntry?.content?.body;
+    }
+
+    get sender() {
+        return this._eventEntry?.displayName;
+    }
+
+    get imageUrl() {
+        if (this._decryptedImage) {
+            return this._decryptedImage.url;
+        } else if (this._unencryptedImageUrl) {
+            return this._unencryptedImageUrl;
+        } else {
+            return "";
+        }
+    }
+
+    get date() {
+        return this._date && this._date.toLocaleDateString({}, { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' });
+    }
+
+    get time() {
+        return this._date && this._date.toLocaleTimeString({}, {hour: "numeric", minute: "2-digit"});
     }
 
     get closeUrl() {
         return this._closeUrl;
     }
+
+    close() {
+        this.platform.history.pushUrl(this.closeUrl);
+    }
 }

src/platform/web/ui/css/layout.css

@@ -109,7 +109,6 @@ main {
     use numeric positions because named grid areas
     are not present in mobile layout */
     grid-area: 2 / 1 / 3 / 3;
-    background-color: rgba(0,0,0,0.5);
     /* this should not be necessary, but chrome seems to have a bug when there are scrollbars in other grid items,
     it seems to put the scroll areas on top of the other grid items unless they have a z-index */
     z-index: 1;

src/platform/web/ui/css/themes/element/theme.css

@@ -632,3 +632,63 @@ button.link {
     color: #03B381;
     font-weight: 600;
 }
+
+.lightbox {
+    background-color: rgba(0,0,0,0.75);
+    display: grid;
+    grid-template:
+        "content close"   auto
+        "content details" 1fr /
+        1fr      auto;
+    color: white;
+}
+
+@media (max-aspect-ratio: 1/1) {
+    .lightbox {
+        grid-template:
+            "close"   auto
+            "content" 1fr
+            "details" auto /
+            1fr;
+    }
+
+    .lightbox .details {
+        width: 100% !important;
+    }
+}
+
+.lightbox .picture {
+    grid-area: content;
+    background-size: contain;
+    background-position: center;
+    background-repeat: no-repeat;
+    width: 100%;
+    height: 100%;
+    margin: auto;
+}
+
+.lightbox .loading {
+    grid-area: content;
+    margin: auto;
+}
+
+.lightbox .close {
+    grid-area: close;
+    margin-left: auto;
+    background-image: url('icons/dismiss.svg');
+    background-position: center;
+    background-size: 16px;
+    background-repeat: no-repeat;
+    width: 16px;
+    height: 16px;
+    padding: 12px;
+}
+
+.lightbox .details {
+    grid-area: details;
+    padding: 12px;
+    font-size: 1.5rem;
+    width: 200px;
+}
+
+

src/platform/web/ui/login/LoginView.js

@@ -35,7 +35,7 @@ export class LoginView extends TemplateView {
         });
         const homeserver = t.input({
             id: "homeserver",
-            type: "text",
+            type: "url",
             placeholder: vm.i18n`Your matrix homeserver`,
             value: vm.defaultHomeServer, 
             disabled

src/platform/web/ui/session/room/LightboxView.js

@@ -15,9 +15,39 @@ limitations under the License.
 */
 
 import {TemplateView} from "../../general/TemplateView.js";
+import {spinner} from "../../common.js";
 
 export class LightboxView extends TemplateView {
     render(t, vm) {
-        return t.div({className: "lightbox"}, [vm.eventId, t.br(), t.a({href: vm.closeUrl}, "close")]);
+        const close = t.a({href: vm.closeUrl, title: vm.i18n`Close`, className: "close"});
+        const image = t.div({
+            role: "img",
+            "aria-label": vm => vm.name,
+            title: vm => vm.name,
+            className: {
+                picture: true,
+                hidden: vm => !vm.imageUrl,
+            },
+            style: vm => `background-image: url('${vm.imageUrl}'); max-width: ${vm.imageWidth}px; max-height: ${vm.imageHeight}px;`
+        });
+        const loading = t.div({
+            className: {
+                loading: true,
+                hidden: vm => !!vm.imageUrl
+            }
+        }, [
+            spinner(t),
+            t.div(vm.i18n`Loading image…`)
+        ]);
+        const details = t.div({
+            className: "details"
+        }, [t.strong(vm => vm.name), t.br(), "uploaded by ", t.strong(vm => vm.sender), vm => ` at ${vm.time} on ${vm.date}.`]);
+        return t.div({className: "lightbox", onClick: evt => this.close(evt)}, [image, loading, details, close]);
+    }
+
+    close(evt) {
+        if (evt.target === this.root()) {
+            this.value.close();
+        }
     }
 }