WIP

src/domain/session/room/RoomViewModel.js

@@ -37,9 +37,9 @@ export class RoomViewModel extends ViewModel {
         this._sendError = null;
         this._composerVM = null;
         if (room.isArchived) {
-            this._composerVM = new ArchivedViewModel(this.childOptions({archivedRoom: room}));
+            this._composerVM = this.track(new ArchivedViewModel(this.childOptions({archivedRoom: room})));
         } else {
-            this._composerVM = new ComposerViewModel(this);
+            this._watchPowerLevelChange();
         }
         this._clearUnreadTimout = null;
         this._closeUrl = this.urlCreator.urlUntilSegment("session");
@@ -67,6 +67,29 @@ export class RoomViewModel extends ViewModel {
         this._clearUnreadAfterDelay();
     }
 
+    async _watchPowerLevelChange() {
+        const powerLevelObservable = await this._room.observePowerLevels();
+        let oldCanSendMessage = powerLevelObservable.get().canSendType("m.room.message");
+        const recreateComposer = newCanSendMessage => {
+            this._composerVM = this.disposeTracked(this._composerVM);
+            if (newCanSendMessage) {
+                this._composerVM = this.track(new ComposerViewModel(this));
+            }
+            else {
+                this._composerVM = this.track(new LowerPowerLevelViewModel());
+            }
+            this.emitChange("powerLevelObservable")
+        };
+        this.track(powerLevelObservable.subscribe(newPowerLevel => {
+            const newCanSendMessage = newPowerLevel.canSendType("m.room.message");
+            if (oldCanSendMessage !== newCanSendMessage) {
+                recreateComposer(newCanSendMessage);
+                oldCanSendMessage = newCanSendMessage;
+            }
+        }));
+        recreateComposer(oldCanSendMessage);
+    }
+
     async _clearUnreadAfterDelay() {
         if (this._room.isArchived || this._clearUnreadTimout) {
             return;
@@ -365,3 +388,13 @@ class ArchivedViewModel extends ViewModel {
         return "archived";
     }
 }
+
+class LowerPowerLevelViewModel extends ViewModel {
+    get description() {
+        return this.i18n`You do not have the powerlevel necessary to send messages`;
+    }
+
+    get kind() {
+        return "low-powerlevel";
+    }
+}

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

@@ -894,12 +894,12 @@ button.link {
     width: 100%;
 }
 
-.RoomArchivedView {
+.DisabledComposerView {
     padding: 12px;
     background-color: var(--background-color-secondary);
 }
 
-.RoomArchivedView h3 {
+.DisabledComposerView h3 {
     margin: 0;
 }
 

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

@@ -16,8 +16,8 @@ limitations under the License.
 
 import {TemplateView} from "../../general/TemplateView";
 
-export class RoomArchivedView extends TemplateView {
+export class DisabledComposerView extends TemplateView {
     render(t) {
-        return t.div({className: "RoomArchivedView"}, t.h3(vm => vm.description));
+        return t.div({className: "DisabledComposerView"}, t.h3(vm => vm.description));
     }
 }

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

@@ -21,7 +21,7 @@ import {Menu} from "../../general/Menu.js";
 import {TimelineView} from "./TimelineView";
 import {TimelineLoadingView} from "./TimelineLoadingView.js";
 import {MessageComposer} from "./MessageComposer.js";
-import {RoomArchivedView} from "./RoomArchivedView.js";
+import {DisabledComposerView} from "./DisabledComposerView.js";
 import {AvatarView} from "../../AvatarView.js";
 
 export class RoomView extends TemplateView {
@@ -32,12 +32,6 @@ export class RoomView extends TemplateView {
     }
 
     render(t, vm) {
-        let bottomView;
-        if (vm.composerViewModel.kind === "composer") {
-            bottomView = new MessageComposer(vm.composerViewModel, this._viewClassForTile);
-        } else if (vm.composerViewModel.kind === "archived") {
-            bottomView = new RoomArchivedView(vm.composerViewModel);
-        }
         return t.main({className: "RoomView middle"}, [
             t.div({className: "RoomHeader middle-header"}, [
                 t.a({className: "button-utility close-middle", href: vm.closeUrl, title: vm.i18n`Close room`}),
@@ -58,7 +52,16 @@ export class RoomView extends TemplateView {
                         new TimelineView(timelineViewModel, this._viewClassForTile) :
                         new TimelineLoadingView(vm);    // vm is just needed for i18n
                 }),
-                t.view(bottomView),
+                t.mapView(vm => vm.composerViewModel,
+                    composerViewModel => {
+                        switch (composerViewModel?.kind) {
+                            case "composer":
+                                return new MessageComposer(vm.composerViewModel, this._viewClassForTile);
+                            case "archived":
+                            case "low-powerlevel":
+                                return new DisabledComposerView(vm.composerViewModel);
+                        }
+                    }),
             ])
         ]);
     }